Abstract: A signal processing apparatus according to the present invention includes: a common pre-processing section for performing signal processing common to a photographed image process and a flicker detection process on an input image signal; a photographed image processing section for performing image signal processing for a displayed image on an image signal from the common pre-processing section; a flicker detection pre-processing section for performing image signal processing for flicker detection on the image signal from the common pre-processing section; and a flicker detecting section for performing flicker detection based on the image signal from the flicker detection pre-processing section.

Abstract: An average value calculation section 100 calculates an average value of each line during the validity period of an input image signal. A three-field average value calculation section 104 calculates a 50 Hz flicker signal from which the light and shade of a subject is removed. A difference value calculation section 105 subtracts an n-field preceding field line average value from the line average value of the present frame. Then, a 60 Hz flicker signal, from which the light and shade of the subject is removed, is calculated by dividing the difference value by the line average value of the present frame. A flicker determination section 112 determines whether flicker exists or not, and whether the flicker frequency is 50 Hz or 60 Hz, on the basis of the extraction results of the 50 Hz flicker component extraction section 108, and of the 60 Hz flicker component extraction section 109.

Abstract: An image-pickup apparatus includes an image-pickup element including a plurality of image-pickup pixels configured to photoelectrically convert light from an image-pickup lens and to generate an image of an object, and a plurality of focus detection pixels each configured to receive light which has passed through an area of a part of an exit pupil of the image-pickup lens, a flicker correction value generator configured to generate a flicker correction value for correcting a flicker in an image signal output from the image-pickup pixels, and a flicker corrector configured to correct a flicker in a focus detection signal output from the focus detection pixels based on the flicker correction value.

Abstract: Common electronic devices having imaging systems that use a rolling shutter scheme suffer from flicker due to the oscillating brightness of an illuminating light source. Some imaging systems use fast frame rates that result in less than two cycles of the illuminating light source occurring during a single frame capture. For devices that employ rolling shutter schemes and fast frame rates, a method of data collection and processing is provided that utilizes a combination of multiple sets of more than two image data frames to automatically detect flicker. Measured patterns of energy differences between various image frames and a reference image frame may be compared with an expected pattern of energy differences to determine a probability of flicker detection due to a given flicker frequency. This probability of flicker detection may be used to activate flicker avoidance procedures in an electronic device.

Abstract: A flash band processing circuit includes: a flash band detecting circuit that detects a start line and an end line of a flash band, which is a level difference for each line generated within a frame in accordance with flash light, based on a difference in exposure periods of a video signal output for each frame by a pixel included in an imaging device employing a rolling shutter system.

Abstract: An imaging apparatus that removes horizontal bands of high-luminance noise caused by incoming flash light and outputs an image whose continuity as a moving picture is maintained. The imaging apparatus includes: an imaging unit that drives an image sensor at a frame rate n times a predetermined video format and outputs an n time-speed image signal; a flashing light detection unit; an average computation unit; and a speed conversion unit. When flashing light is detected, frames containing flashing light are removed from the image signal outputted by the imaging unit, and the average of the remaining frames is calculated, thereby obtaining an average image signal. When flashing light has not been detected, the average of n frames is calculated without removing frames, thereby obtaining an average image signal. The average image signal is converted to 1/n speed and outputted in the predetermined video format.

Abstract: Disclosed herein is an image taking apparatus including an image taking device, a gain adjustment circuit, and a correction circuit. The image taking device operates with timings based on a frame rate determined in advance and the total number of horizontal lines, has an electronic shutter allowing a shutter speed to be adjusted, receives light in a period equal to the shutter speed of the electronic shutter and carries out an opto-electrical conversion process on the light for every horizontal line in order to generate a predetermined signal. The gain adjustment circuit adjusts the gain of the electrical signal received from the image taking device. The correction circuit compares an image taking video signal with a reference video signal to compute a flicker component as a component oriented in the vertical direction of an image represented by the image taking video signal in a flicker correction process of eliminating flickers.

Abstract: An image pickup apparatus 100 includes an image pickup element 101 that includes a plurality of pixels that function as both imaging pixels and focus detection pixels, which is configured so that an image pickup signal that is obtained by performing photoelectric conversion in a first direction, an evaluation value generating unit 107 that generates an evaluation value of the image pickup signal, a flicker detecting unit 108 that detects variation information of illumination intensity based on the evaluation value, a flicker correction value generating unit 109 that generates a flicker correction value for performing a flicker correction for the image pickup signal based on the variation information, a multiplier 105 that performs the flicker correction for the image pickup signal based on the flicker correction value, and a vertical correlation calculating unit 114 that performs a correlation calculation in the first direction after the flicker correction is performed.

Abstract: The disclosure is directed to techniques for region-of-interest (ROI) video processing based on low-complexity automatic ROI detection within video frames of video sequences. The low-complexity automatic ROI detection may be based on characteristics of video sensors within video communication devices. In other cases, the low-complexity automatic ROI detection may be based on motion information for a video frame and a different video frame of the video sequence. The disclosed techniques include a video processing technique capable of tuning and enhancing video sensor calibration, camera processing, ROI detection, and ROI video processing within a video communication device based on characteristics of a specific video sensor. The disclosed techniques also include a sensor-based ROI detection technique that uses video sensor statistics and camera processing side-information to improve ROI detection accuracy.

Abstract: Disclosed is an imaging apparatus with a flicker detector that restrains an increased calculation amount and image quality degradation. The apparatus includes a frame rate controller for setting a frame rate of an acquired image to a first frame rate or different second frame rate, a luminance calculator for calculating a first luminance difference between two images of a first group continuously acquired at the first frame rate and a second luminance difference between two images of a second group continuously acquired at the second frame rate, and a flicker detector for comparing the first and second luminance differences with first and second threshold, respectively, and determining whether flickers of a first frequency and a different second frequency are generated or not.

Abstract: An imaging device and method, wherein the imaging device includes an exposure controller for setting a first electric-charge accumulation time for a first scanning line of an imaging element, and for setting a second electric-charge accumulation time for a second scanning line of the imaging element; a luminance difference calculator for calculating a luminance difference in a vertical direction between a first image signal based on the first scanning line and a second image signal based on the second scanning line from a frame output from the imaging element, the vertical direction being perpendicular to a direction of the scanning lines; and a flicker detector for determining whether flicker is generated in the frame based on the luminance difference.

Abstract: Methods for estimating illumination parameters under flickering lighting conditions are disclosed. Illumination parameters, such as phase and contrast, of a intensity-varying light source may be estimated by capturing a sequence of video images, either prior to or after a desired still image to be processed. The relative average light intensities of the adjacently-captured images are calculated and used to estimate the illumination parameters applicable to the desired still image. The estimated illumination parameters may be used to calculate the point spread function of a still image for image de-blurring processing. The estimated illumination parameters may also be used to synchronize the exposure timing of a still image to the time when there is the most light, as well as for use in motion estimation during view/video modes.

Abstract: An image capture device to eliminate flicker includes an image detection unit forming consecutive preview images at a predetermined rate, each formed with a group of parameters, and a flicker elimination unit acquiring the exposure count of the preview images, plotting the exposure count to form a waveform, determining whether the exposure count is fluctuating, analyzing the information of the waveform to allow determination of modulation of one of the group of parameters if the exposure count is fluctuating, and modulating one of the group of parameters according to the analysis result.

Abstract: A novel method and apparatus for controlling operation of a photosensor array in a portable electronic device to reduce flicker resulting from fluorescent light having a periodic intensity. The method comprises selecting a time zone in which the device is to be operated, correlating the time zone with a corresponding frequency of the fluorescent light, and signaling the photosensor array to operate in accordance with a mode optimized to reduce flicker based on the selected time zone.

Abstract: An apparatus for detecting flicker noise disclosed in the present invention comprises an output unit for outputting a standard data for flicker noise judgment using a statistical calculation value for each calculated line based on brightness information of pixels for each line of an object image for flicker noise detection; a flicker line detection unit for detecting flicker lines, namely, lines corresponding to the standard data where the distance between the lines are within a predetermined allowance of a regular interval; and a judgment unit for comparing the number of the detected flicker lines with a standard number for flicker noise judgment to judge if the object image is a flicker noise image. The present invention can realize a method for detecting flicker noise, in which an image obtained with the reduced calculation time and use of a minimum memory has a robust in characteristics of a subject.

Abstract: A method for reading a pixel, the method includes: (i) generating a first signal responsive to light sensed by the pixel during a first exposure period; (ii) comparing a first threshold to a first value of the first signal; (iii) writing a second value to the pixel; wherein the second value equals the first threshold if the first value exceeds the first threshold; wherein the second value equals the first value is the first signal is below the first threshold; (iv) generating a third signal responsive to the second value and to light sensed by the pixel during a second exposure period; (v) reading the third signal; and (vi) calculating a digital detection signal in response to a value of the third signal and in response to a first threshold.

Abstract: An image sensor has an imaging surface irradiated with an optical image of an object scene, and repeatedly generates an object scene image. A CPU repeatedly determines whether or not a specific variation exceeding a reference is generated in the object scene captured by the image sensor, in parallel with a generating process of the object scene image by the image sensor. When a determination result is updated from a negative result to an affirmative result, the CPU waits for an elapse of a designated period, then, determines presence or absence of a generation of a flicker, and executes a flicker countermeasure process, as needed.

Abstract: It is determined whether or not flicker has occurred in an image signal obtained on the basis of an output signal of an image pickup element. If it is determined that flicker has occurred, a flicker correction method is selected according to a gain value set in the image signal.

Abstract: A blinking-signal device 1 includes a light receiving section 10, a row selecting section 20, a readout section 30, a detecting section 40, and a control section 50. By the row selecting section 20, charge generated in its photodiode of each pixel unit P2i-1,n of the (2i?1)-th row in the light receiving section 10 is accumulated in its charge accumulating section during a first period, and charge generated in its photodiode of each pixel unit P2i,n of the 2i-th row in the light receiving section 10 is accumulated in its charge accumulating section during a second period. With the detecting section 40, it is detected whether or not light reaching the pixel units P2i-1,n and P2i,n is a blinking signal on the basis of a difference between data D2i-1,n and D2i,n of the pixel units P2i-1,n and P2i output from the readout section 30.

Abstract: A readout frequency of a sensor of a digital image capturing device is set based on a frequency of alternating current (AC) mains so that a readout period of the sensor of the digital image capturing device is not an integer multiple of a flicker period. The flicker period is equal to half of a period of the AC mains. A first image frame and a second image frame are captured using the sensor of the digital image capturing device. The second image frame is captured later in time than the first image frame. Whether flicker has occurred in the first and second image frames due to a periodic fluctuation of light emitted by a light source powered by the AC mains is detected by comparing a brightness of an area of the first image frame to a brightness of a corresponding area of the second image frame.

Abstract: The present invention provides an effective flicker detection method performing a motion compensation. The present invention includes the steps of: calculating a luminance difference between neighboring pixels; summing up the luminance difference in a specific direction if the difference is greater than a threshold value; performing a motion estimation by using a sum calculated through step (b) to thereby calculate a motion displacement; performing a motion compensation to a current frame data by using the motion displacement; calculating a difference between a previous frame data and the compensated current frame data; and detecting the flicker by using the difference calculated in step (e).

Abstract: A circuit for automatically detecting image flicker includes an image sensor, an average unit, a difference generation unit, a transform unit, and a flicker detection unit. The image sensor captures an image frame. The average unit generates a luminance average value according to a luminance sum of predetermined pixels of each pixel row of an image frame. The difference generation unit generates a corresponding difference according to a luminance average value of each pixel row of two consecutive image frames. The transform unit performs a discrete Fourier transform on a difference corresponding to a corresponding pixel row of the two consecutive image frames to generate a transform result. The flicker detection unit determines whether a flicker is shown in the two consecutive image frames to generate a detection result according to the transform result.

Abstract: A frame brightness detecting unit 15 detects a frame brightness value of each of a plurality of image frames. A flicker spectrum detecting unit 16 detects, from the frame brightness values of 512 frames, spectrum values at frequencies, such as 100 Hz, 200 Hz, and 300 Hz. A brightness estimating unit 17 estimates a brightens value of a light source from the spectrum values. An encoding unit 18 uses a reciprocal of the estimated brightens value to determine a reference frame. The encoding unit 18 also uses the reciprocal in an evaluation function for motion vector estimation. The image frame is encoded using the motion vector.

Abstract: Subject matter disclosed herein relates to setting photographic parameters based, at least in part, on signal measurements, such as, for example, without limitation, position of the Sun. Briefly, in accordance with one embodiment, an apparatus may comprise the following: a wireless communication capable device (E.G., 400, 1100) including an integrated digital camera (E.G., 1180, 402); the device capable of estimating position of the Sun relative to the position of the device based at least in part on signal information received via wireless communication; and the device being further capable of using the estimated position of the Sun so as to affect one or more photographic parameters. Briefly, in accordance with another embodiment, a method may comprise the following: acquiring information via wireless communication (E.G.

Abstract: An imaging system and method that captures compressive sensing (CS) measurements of a received light stream, and also obtains samples of background light level (BGLL). The BGLL samples may be used to compensate the CS measurements for variations in the BGLL. The system includes: a light modulator to spatially modulate the received light stream with spatial patterns, and a lens to concentrate the modulated light stream onto a light detector. The samples of BGLL may be obtained in various ways: (a) injecting calibration patterns among the spatial patterns; (b) measuring complementary light reflected by digital micromirrors onto a secondary output path; (c) separating and measuring a portion of light from the optical input path; (d) low-pass filtering the CS measurements; and (e) employing a light power meter with its own separate input path. Also, the CS measurements may be high-pass filtered to attenuate background light variation.

Abstract: An imaging system and method that captures compressive sensing (CS) measurements of a received light stream, and also obtains samples of background light level (BGLL). The BGLL samples may be used to compensate the CS measurements for variations in the BGLL. The system includes: a light modulator to spatially modulate the received light stream with spatial patterns, and a lens to concentrate the modulated light stream onto a light detector. The samples of BGLL may be obtained in various ways: (a) injecting calibration patterns among the spatial patterns; (b) measuring complementary light reflected by digital micromirrors onto a secondary output path; (c) separating and measuring a portion of light from the optical input path; (d) low-pass filtering the CS measurements; and (e) employing a light power meter with its own separate input path. Also, the CS measurements may be high-pass filtered to attenuate background light variation.

Abstract: An image processing apparatus includes: an integrating unit integrating an input image signal over a time interval equal to one horizontal period or longer; a normalizing unit normalizing an integrated value obtained by the integrating unit, or a difference value in the integrated value between adjacent fields or frames; an extracting unit extracting a spectrum of the normalized integrated value or difference value; an estimating unit estimating a flicker component on a field-by-field basis or frame-by-frame basis from the extracted spectrum; a detecting unit detecting a deviation of the latest flicker component, from the estimated latest flicker component and one or more flicker components estimated in the past; a correcting unit correcting the latest flicker component on the basis of the detected deviation of the flicker component; and a computing unit computing a corrected flicker component and the input image signal so as to cancel out the corrected flicker component.

Abstract: When capturing images of a subject with an imaging device that uses a CMOS image sensor, a white band-shaped artifact appears in the imaging signal due to the influence of a rolling shutter operation performed when an external flash has been emitted. Manipulating or removing images in which such an artifact appears requires specifying the frames in which the artifact appears. A line averaging unit (11) calculates the average luminance level of each line in the imaging signal, the average luminance levels are temporarily stored by a storage unit (12), and thereafter a frame difference calculation unit (13) calculates the difference between the line average luminance levels and the line average luminance levels of the next frame. These frame difference values are compared with a reference value, and it is determined that the influence of an external flash is present if a portion of interest with high values is continuous for one frame period.

Abstract: An image pickup apparatus of the present invention includes an image pickup element having imaging pixels and focus detection pixels, and configured to read a signal for which a photoelectric conversion has been performed in a first direction, a focus detector capable of detecting a focus state using a phase difference of a pair of images in the first direction and a pair of images in a second direction based on outputs of the focus detecting pixels, a flicker reduction portion configured to reduce the flicker, and a controller configured to control a focal point in accordance with the focus state obtained from a phase difference of the pair of images in the first direction before an operation of the flicker reduction portion.

Abstract: Provided are a flicker correcting device and a flicker correcting method which are capable of reducing the frequency of occurrence of a flicker during detection of the flicker. A nonvolatile memory stores information on a power source frequency of illumination under an image pickup environment. A control unit performs a setting related to flicker correction of an image pickup unit based on the information stored in the nonvolatile memory. A signal processing circuit detects a flicker from image data acquired in the set state. The control unit writes the information on the power source frequency of illumination under the image pickup environment into the nonvolatile memory based on a result of flicker detection by the signal processing circuit.

Abstract: In a case in which flickers are detected from a live-view image, at least one of a start timing and an end timing of charge accumulation at an image sensor is fixed by setting the image-sensing frame rate during execution of image-sensing plane AF to a value synchronized with the flicker cycle. In an image sensing apparatus for carrying out image-sensing plane AF with the use of live-view images, aperture control and accumulation time control with a high degree of freedom can be achieved even under a flicking light source.

Abstract: A flicker detection region in which an image signal has values relating to luminance and colors within predetermined ranges is extracted from a plurality of flicker detection regions allocated in the vertical and horizontal directions of an image. A flicker component is detected using the luminance information of the image signal in the extracted flicker detection region. A correction value to correct the flicker component is generated from the detected flicker component. This makes it possible to accurately correct, using a simple arrangement, a flicker component contained in an image sensed under a light source whose brightness periodically changes even when the object or the image sensing apparatus moves.

Abstract: Disclosed herein is an image processing apparatus including a color-flicker detection processing section configured to detect generation of color flickers from a plurality of images taken at different exposure times, wherein the color-flicker detection processing section: acquires a ratio of any specific one of a plurality of color signals of the taken images to another one of the color signals; obtains an evaluation value of the color flickers from the acquired ratio; and determines whether or not the color flickers have been generated on the basis of the magnitude of the evaluation value.

Abstract: An image pickup apparatus capable of accurately detecting a flicker in a short time period without regard to a state of object and a photography scene. A signal processing circuit reads out an n-th line of an image subjected to collective reset/collective transfer readout, reads out an n-th line of an image subjected to rolling readout, and subtracts an output of a pixel section of a particular column of the n-th line of the image subjected to the rolling readout from an output of a corresponding pixel section of the image subjected to the collective reset/collective transfer readout. The signal processing circuit determines that a flicker is generated, if there is a differential value not less than a predetermined threshold value between each pair of outputs from the pixel sections of the same line and if there is a periodicity in an image vertical direction.

Abstract: The present invention provides an effective flicker detection method performing a motion compensation. The present invention includes the steps of: calculating a luminance difference between neighboring pixels; summing up the luminance difference in a specific direction if the difference is greater than a threshold value; performing a motion estimation by using a sum calculated through step (b) to thereby calculate a motion displacement; performing a motion compensation to a current frame data by using the motion displacement; calculating a difference between a previous frame data and the compensated current frame data; and detecting the flicker by using the difference calculated in step (e).

Abstract: An image processing apparatus includes: a difference calculation unit that calculates a difference value of a feature amount of image data of a predetermined region between a present frame and a past frame; a first counting unit that counts number of times when an absolute value of the difference value exceeds a threshold during a predetermined period of time; a second counting unit that counts number of times when the difference value of the image data have different plus-minus signs between a present frame and a past frame during a predetermined period of time; and an identification unit that identifies a light source frequency by comparing the output of the second counting unit with a predetermined value when the output of the first counting unit exceeds a predetermined value.

Abstract: A video camera includes a light collection array including a plurality of light collection cells configured to collect light from a scene and a processor coupled to the light collection array. The processor is configured determine a brightness of the scene based on the light collected by the light collection array from the scene. Based on the determined brightness, the processor is configured to determine if the brightness of the scene requires a light collection time of each cell to be less than a flicker on time of a light source lighting the scene so that the light collection array collects a sufficient amount of light so that a brightness of a video stream or a still image is substantially at a predetermined level.

Abstract: The disclosure describes flicker detection and correction techniques to improve the quality of captured imagery, such as video or still images. In particular, this disclosure describes flicker correction techniques that compare different image frames to detect flicker. In some embodiments, the comparisons involves summing intensity values associated with rows within the frames and comparing the row sums to generate a difference signal. Detection and correction of flicker may be performed using a first derivative of the difference signal. The first derivative of the difference signal can be used in variety of ways to detect and correct flicker.

Abstract: To reduce flicker appropriately according to illumination condition of an imaging subject, a video camera is provided. The video camera includes an imaging unit for generating a subject image; a superimposing image generator for generating a superimposing image; an image synthesizer for synthesize the subject image and the superimposing image to generate a synthesized image; a video signal generator for generating a video signal from the synthesized image so as to display the synthesized image. The video camera also includes a flicker reduction unit to reduce flicker caused by luminance fluctuation of a light source. The flicker reduction unit has a plurality flicker reduction modes. The mode setting unit makes the superimposing image generator to generate a settings screen as the superimposing image for assisting selection of one of the flicker reduction modes.

Abstract: An arithmetic processing section executes an arithmetic process on a flicker correction signal output from a flicker correction signal outputting section and corresponding to the flicker component contained in a video signal of each of specific periods and the video signal of each of the specific periods to form a corrected video signal of the specific period corrected for the flicker component of the specific period for the video signal of each of the specific periods formed as a succession of specific periods and containing a flicker component as supplied from a video signal generating section in response to a correction error signal of each of the specific periods supplied from a correction error detecting section.

Abstract: A circuit includes a luminance average value output unit for extracting luminance values from pixel data of the first and the second frames to generate first luminance average values for pixel lines of the first frame and second luminance average values for pixel lines of the second frame, a flicker curve generating unit for subtracting the second luminance average values from the first luminance average values, thereby generating a flicker curve, and a flicker detecting unit for extracting a plurality of local minimum points from the flicker curve, calculating a distance between each two neighboring local minimum points of the extracted local minimum points, and determining whether the flicker is present based on the distances and the frequency numbers of the distances.

Abstract: A flicker is caused by a light lit on a commercial AC power. An iris priority camera cannot fix a shutter thereof to a shutter speed at which no flicker occurs. Each of images picked up by a surveillance camera provides precious information. Therefore, even when the shutter is set to a high shutter speed, images devoid of an afterimage or a blue have to be picked up even from a subject which makes movements. When a decision is made that a flicker is present, the timings of applying a discharging pulse and a charge readout pulse respectively are varied depending on a field in order to implement shutter speed control in a CCD sensor, so that a camera can be exposed to a portion of light falling into the same phase thereof within a luminescence period of a lighting during each field. The CCD sensor can be exposed to the light without occurrence of a flicker even when a light source emits light while being repeatedly lit and extinguished.

Abstract: An imaging apparatus includes: an imaging section that captures an image of a subject; a detection section that detects flicker of a through-the-lens image as a moving image of the subject which is obtained by image capturing of the imaging section; and a control section that, when the detection section detects the flicker, controls an aperture, a shutter speed, and a gain on the basis of through-the-lens image control values as control values for controlling the aperture, the shutter speed, and the gain so as to preferentially suppress occurrence of flicker in the through-the-lens image.

Abstract: The invention provides a method for providing an image, the method includes: exposing a first group of pixels located at a first location to light, during an intermediate exposure period, to provide analog signals representative of the light; and transferring the analog signals to a second group of pixels located at a second location; whereas a relationship between the first and second locations is responsive to an estimated inter-image shift; then further exposure of the second group of pixels etc.

Abstract: Line integration unit 31 performs integration on digital image signals of a horizontal line. Sampling unit 32 samples, as a second line integral, a first line integral relating to each of at least one but not all of horizontal lines constituting one frame. Memory 33 stores acquired second line integrals corresponding to a plurality of frames. Inter-screen DFT unit 34 performs discrete Fourier transform on a second line integral sequence composed of a second line integral most recently sampled by the sampling unit 32b and the second line integrals stored in the memory 33. Flicker extraction unit 35 extracts information of flicker component based on a result of the discrete Fourier transform. Flicker coefficient calculation unit 36 calculates a flicker coefficient based on the information. Correction operation unit 37 performs operation of reducing the flicker component on the image signals based on the flicker coefficient.

Abstract: A method, apparatus, and computer-readable storage medium for removing flickering from a video of an object illuminated by a screen that operates on a refresh rate value (fscr) among a first value set including screen compatible refresh rate values, and an ambient lighting that operates on a certain line frequency value (fl) captured by a camera with a certain exposure time value (te) among a second value set including camera compatible exposure time values.

Abstract: To automatically detect and correct flickers in a video capture device, a frame number generator receives a plurality of frames and generates frame numbers. A storage device stores brightness values of partial pixels of a frame numbered 1. An extractor extracts brightness values of partial pixels of a frame numbered N. A difference summation device computes differences of the brightness values of the partial pixels of the frames numbered 1 and numbered N and sums up the differences to generate a brightness difference summation signal. A flicker detector detects a banding value in the brightness difference summation signal. A flicker corrector uses the banding value and the frame numbers to find a fixed frequency flicker effect in the frames, and generates a flicker correction signal when the fixed frequency flicker effect in the frames is found.

Abstract: An image-processing apparatus includes an integration section to integrate an image signal in more than one unit of horizontal synchronization period; an interpolation section to carry out an interpolation on the basis of integration values output by the integration section in order to generate integration values corresponding to a predetermined number of sampling positions set in advance during at least one period of flickers appearing on a screen under a fluorescent lamp; a normalization section to normalize an integration value output by the interpolation section or to normalize a difference value between integration values output by the interpolation section as integration values for adjacent fields or frames, respectively; a frequency analysis section to extract a spectrum of normalized integration value or difference values output by the normalization section; and a flicker inference section to infer a flicker component from the spectrum extracted by the frequency analysis section.

Abstract: A method for suppressing banding and rolling flicker in video acquired by a video camera. The method comprises acquiring a plurality of video frames and assessing an amount of rolling flicker in the plurality of video frames. The method further comprises configuring the video camera to quiet banding and rolling flicker responsive to periodic illumination at a first frequency if the amount of rolling flicker is above a threshold, and, configuring the video camera to quiet banding and rolling flicker responsive to periodic illumination at a second frequency if the amount of rolling flicker is below the threshold.

Abstract: An image capture apparatus comprises an X-Y address scan type image sensor; a flicker detector configured to detect a flicker of a light source; a switch configured to switch the image sensor between a first state in which the image sensor is driven by a first driving method which comprises reading out a pixel signal within a range of a first angle of view and a second state in which the image sensor is driven by a second driving method which comprises reading out a pixel signal within a range of a second angle of view narrower than the first driving method; and a controller configured to control the switch so as to drive the image sensor by the first driving method while the flicker detector is detecting the flicker and to drive image sensor by the second driving method when the flicker detector has completed flicker detection.