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: One disclosed embodiment includes detecting flicker in a photographic setting. A plurality of samples are obtained from a light detector circuit of a camera, each of which has a value that is dependent upon intensity of light incident upon the camera. The method further includes processing the samples to identify whether the incident light is varying in intensity at one or more pre-selected frequencies. The processing may include multiplying the samples with one or more periodic signals to generate scalar product outputs, and analyzing the scalar product outputs to ascertain the presence of periodic flicker.

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 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: According to one embodiment, a solid-state imaging device includes a pixel unit, a flicker detecting unit, a flicker-level estimating unit, and a flicker correcting unit. The flicker detecting unit detects, based on a magnitude relation of a signal amount in each of lines formed in the pixel unit, presence or absence of a flicker. The flicker-level estimating unit estimates a flicker level in each of the lines of the next frame. The flicker correcting unit corrects, for each of the lines, a flicker that occurs in a signal of an image picked up by the pixel unit.

Abstract: An improved display screen flicker detection and correction system. The system includes a flicker detection component. A test pattern is placed on a display screen to be tested and corrected. The flicker detection component is placed on or near the display screen. The flicker detection component senses the change in light level that results from the flickering screen. The display system is then adjusted to minimize flicker.

Abstract: An object of this invention is to suppress both the influence of a change in image quality by flicker and the influence of degradation of the image quality by a camera shake when an electronic still camera takes a picture under illumination having flicker. In an electronic still camera which captures a plurality of low-luminance images and composites them into one image of correct exposure, when the exposure time is shorter than the flicker interval of illumination light, the center of the exposure time is made to substantially coincide with the maximum value of the light quantity of illumination light. When the exposure time is longer than the flicker interval of illumination light, the exposure time is set again to a natural number multiple of the flicker interval.

Abstract: A method of determining when an image capture device with a rolling shutter is in an environment having a flickering illuminant by using autocorrelation or frequency analysis of difference vectors produced from first and second captured images.

Abstract: An image capturing apparatus and its control method for capturing a moving image. Plural movie capturing modes with different control parameters are set in accordance with an instruction from a user. One of selectable frame rates is selected in accordance with video output setting by the user. Moving image frames are generated based on the selected frame rate and a control parameter corresponding to the frame rate, and recorded as a moving image on a recording medium.

Abstract: A method for generating a fluorescence microscopy image of a sample. The method comprises a step of obtaining a series of fluorescence microscopy images of the sample for a plurality of different focal plane depths in the sample and different exposure times. The images may be obtained directly from a microscope, or from a library of images. Images comprising the series of fluorescence microscopy images are combined to form a single resultant fluorescence microscopy image of the sample. The single resultant image may then be analyzed as if it were a conventional fluorescence microscopy image, e.g. by visual inspection or numerical processing. However, because the resultant image is based on images from a range of focal plane depths and exposure times, different structures that appear under only certain conditions (i.e. in only certain ones of the original series of fluorescence microscopy images) can appear together in a single image, thus simplifying visualization, interpretation and analysis of the sample.

Abstract: A video camera includes an imager. An imager outputs an object scene image produced on an imaging surface. A detector detects a plurality of luminance change amounts respectively corresponding to a plurality of timings based on the object scene image outputted from the imager. A determiner determines generation/non-generation of a flicker by referring to a difference between a sine wave depicted along a time axis and the plurality of luminance change amounts detected by the detector. A first adjuster adjusts an angular frequency of the sine wave to a frequency corresponding to a drive system of the imager. A second adjuster adjusts an initial phase and an amplitude of the sine wave based on the plurality of luminance change amounts detected by the detector.

Abstract: There is provided a blink signal detection circuit which can clearly detect a blink signal of a blinking measurement target even if the measurement target moves. The blink signal detection circuit includes: a plurality of storage media that record image information shot by an imaging device at respective times, the image information showing a light-dark change in brightness of the measurement target which is blinking; an image information enlargement unit (pixel information enlargement circuit) that enlarges a plurality of pieces of image information at the respective different times with reference to a spatial axis, thereby generating a plurality of pieces of enlarged image information at the respective different times; and a correlation detection unit (correlation integration circuit) that performs correlation detection between the plurality of pieces of enlarged image information at the respective different times.

Abstract: A smoke detecting method and device are provided. The smoke detecting method and device capture a plurality of images; determine one of the plurality of images as an analyzable image when the one of the plurality of images is identified to have a moving object; analyze a chrominance variation of the analyzable image; analyze at least one of an edge blur and a flickering frequency of the analyzable image; compare at least one of analyzed results from the analyzing steps with a corresponding predetermined feature; and determine the moving object is a smoke when at least one of the analyzed results conforms to the corresponding predetermined feature.

Abstract: An apparatus for measuring the power frequency of a light source includes a photo-sensitive transistor, a modulators and a logic unit. The photo-sensitive transistor generates an electrical signal that is responsive to light incident thereon from the light source. The modulator generates a modulated signal based on the electrical signal that toggles at a rate substantially proportional to the power frequency of the light source. The logic unit is coupled to receive the modulated signal and determine its toggling frequency.

Abstract: An object of this invention is to allow quickly, reliably confirming an in-focus state with a simple arrangement. To achieve this object, an image sensing apparatus includes an image sensing element which photoelectrically converts an object image, a first image generation unit which generates a first image obtained from the image sensing element, a second image generation unit which generates a second image of a predetermined region from the image obtained by the image sensing element, and an exposure control unit which controls exposure so as to set the second image to appropriate brightness.

Abstract: The present disclosure provides a method for detecting flicker DC voltage offset. The method includes receiving an output signal of an image sensor, the output signal comprising a reference signal and an image signal, and generating a combined signal by combining the image signal with a peak flicker DC voltage signal during a first time period. The method also includes performing an auto zero function in an auto zeroing comparator during the first time period between the reference signal and the combined signal and comparing the reference signal and the image signal with the auto zeroing comparator during a second time period subsequent to the first time period. The method further include storing a first charge corresponding to the image signal during a second time period and storing a second charge corresponding to a current peak flicker DC voltage signal.

Abstract: An image sensing apparatus has a first setting unit that sets a charge accumulation period in an image sensor to an integral multiple of ½ a flicker period, a second setting unit that, when a horizontal scan period, which is a period after commencement of reading out a preset line of the image sensor until commencement of reading out a line to be read out next, is changed to be shorter, sets a charge accumulation period of the image sensor immediately after a change in the horizontal scan period to a period that is an integral multiple of ½ the flicker period and is shorter than the charge accumulation period that has been set by the first setting unit, and a timing controller that controls the image sensor to achieve the charge accumulation periods set by the first and second setting units.

Abstract: A fluoroscopy apparatus includes an illumination portion irradiating an observation target with illumination light; a fluorescence image acquisition device acquires fluorescence emitted from an observation target to acquire a fluorescence image; a fluorescence image-acquisition optical system forms an image of the observation target using the fluorescence; a reference-light image acquisition device acquires returning light from the observation region to acquire a reference image; a reference-light image-acquisition optical system forms an image using the returning light; and an image correction section corrects the fluorescence image by the reference image, wherein the product of an pixel density of the reference-light image acquisition device and the image-forming magnification of the reference-light image-acquisition optical system is less than the product of the pixel density of the fluorescence image acquisition device and the image-forming magnification of the fluorescence image-acquisition optical syste

Abstract: An image pickup apparatus is disclosed which can remove noise with certainty from an image pickup signal while a high resolution of the image pickup signal is assured regardless of a reading out method of the image pickup signal and achieve reduction of the cost. A light receiving face of a solid-state image pickup device has an image pickup region from which a detection signal corresponding to an image of an image pickup subject formed from light incoming to the light receiving face is outputted as an image pickup signal and a light amount detection region from which a detection signal corresponding to the amount of the light incoming to the light receiving face is outputted as a light amount detection signal. A signal processing circuit of a signal processing section processes the image pickup signal to produce a video signal. A detection circuit detects cyclic variation of the luminosity of a light source from the light amount detection signal.

Abstract: The specification and drawings present a new method, apparatus and software product for reducing flicker effects in electronic devices (e.g., a video camera, a camera-phone mobile device, a portable electronic device, etc.) by reducing an optical intensity of a video image received by the electronic device. It is determined by the electronic device whether a flicker light source is present and if predetermined conditions are met. As long as that is the case, an optical attenuation of a video image taken by the electronic device is provided using a predetermined criterion and a video signal of the video image is generated by the electronic device using an exposure time substantially equal to or a multiple of an inverse of a flicker frequency.

Abstract: Even when the light intensity of the light source varies, the flicker correction can thus be made flexibly. The present invention provides a flicker correction method comprising the steps of predicting, from an image of a present flicker-corrected frame, a flicker of an image of a next frame to generate two types of flicker images having flickers different in level from each other added thereto, detecting a flicker component through comparison between the generated two types of flicker images and an image of an input next frame, generating a flicker correction value on the basis of the detected flicker component, and making flicker correction by adding the generated flicker correction value to an input image frame by frame.

Abstract: An imager is provided having an image-capturing sensor, a focusing detector, and a flicker detector. The image-capturing sensor captures a subject image with a rolling shutter and outputs image data. The focusing detector determines whether a subject image is in focus of the image-capturing sensor using the output image data. The flicker detector detects a flicker in the output image data. The focusing detector uses horizontal data without vertical data from the image data so as to determine whether a subject image is in focus, when the flicker detector detects a flicker.

Abstract: An image device, such as a digital camera, detects specific repeating patterns of signal variations by processing columnar information from the device's two-dimensional sensor array used to generate images. In one embodiment, the columnar information is derived from calculating row averages for two image frames, with each row average being a computed average of the multiple signal intensities generated from some or all of the sensors within a particular row. After the columnar information is determined for each of the two frames, a difference signal is generated as a sequence of the differences between the row averages for the first frame and the row averages for the second frame. This row averaging and frame differencing removes a large percentage of the signal energy that is not a result of the artifact of interest, such as the flicker generated by illumination having intensity fluctuations at 100 Hz or at 120 Hz.

Abstract: An image sensor repeatedly receives a light from an object through a lens and generates images of the object. A differential image generating unit generates a differential image from at least two images. A detector detects a change cycle or an intensity of an external light. An evaluation unit evaluates an influence of the external light and derives an optimal timing in which a minimum influence of the external light is attained. A controller controls a timing of receiving the light of the image sensor, depending upon the optimal timing derived by the evaluation unit, and repeatedly synchronizes a term of two timings with the change cycle of the external light by shifting the term into the change cycle by a unit of predetermined phase difference.

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: A video camera includes an image sensor. The image sensor repeatedly outputs an object scene image produced on an imaging surface having a plurality of pixels lined up in a vertical direction. A driver repeatedly executes an exposing operation for exposing the imaging surface for each pixel lined up in a vertical direction. A CPU repeatedly detects a plurality of luminance values respectively corresponding to a plurality of flicker evaluation areas allocated to the imaging surface in a manner to be located at positions different from one another in a vertical direction, based on the object scene image outputted from the image sensor. Moreover, the CPU determines the presence or absence of a flicker based on the plurality of luminance values thus detected.

Abstract: An exemplary automatic focusing system adopted in a camera includes a brightness detecting unit, a recording unit, a correcting unit, and a selecting unit. The brightness detecting unit is configured for detecting a general brightness value of an environment of a subject prior to a focusing operation of the camera and outputting a correction factor associated with the general brightness value. The recording unit is configured for storing a first set of brightness values and the first set of contrast values. The correcting unit stores a preset brightness value and a preset contrast value. The correcting unit is configured for calculating a number of second contrast values according to the correction factor, the first set of brightness values, a preset brightness value, and a preset contrast value. The selecting unit is configured for choosing a maximum contrast value from the number of second contrast values of the subject.

Abstract: The invention refers to an apparatus and a method for reducing random noise in a sequence of digital video frames comprising the following steps: 1. for each of the pixels (center pixel) in a frame a set of adjacent pixels is defined; 2. for each of the adjacent pixels the difference of their values in the current frame and the previous frame is calculated, whereby the value of the center pixel is omitted; 3. each difference value is shifted right for a predefined number of bits; 4. the square of the difference value is added to an activity value of that center pixel; 5. if the activity value remains below a predefined threshold value, then a weighting factor depending from activity value is calculated and 6. the value of the center pixel is set to a weighted value.

Abstract: In a camera apparatus of the present invention, a phase difference sensor, which is normally used for automatic focusing operation, is effectively used to detect a flicker of the fluorescent light (S104), and it is judged whether the flicker has been detected or not (S105). When the flicker has been detected, gain No. (3) prepared for the fluorescent light is selected to be set to a gain control circuit at a time of a capture (S106). The infrared light is detected (S107) based on an output used from an infrared light sensor, which is provided for receiving an infrared-light code signal from a remote control unit, and it is judged whether the infrared light has been detected or not (S108) . When the infrared light has been detected, gain No. (4) prepared for the incandescent light is selected to be set to a gain control circuit (S109).

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 (where n is an integer of 3 or more) 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: An XY address scanning-type imaging apparatus, such as a CMOS imaging apparatus, having a high-speed shutter which is capable of reducing fluorescent-lamp flicker components and which enhances electronic camera-shake correction. When the vertical synchronization frequency is denoted as fv (Hz) and N is a positive integer, the shutter is set to N/120 seconds when 120/fv is an integer, and the shutter is set to N/100 seconds when 100/fv is an integer. In the NTSC system, when camera-shake correction is ON, the shutter speed is set to fraction ( 1/120) seconds, and when camera-shake correction is OFF, the shutter speed is set to fraction ( 1/60) seconds. In the PAL system, when camera-shake correction is ON, the shutter speed is set to fraction ( 1/100) seconds, and when camera-shake correction is OFF, the shutter speed is set to fraction ( 1/50) seconds.

Abstract: As to an image signal of a solid-state image pickup device, an average value calculating unit calculates average values of pixel values of individual color components constituting an image of each frame. A gain calculating unit calculates, for the number of frames in one cycle of flicker generation, maximum values of the average values of the pixel values of the individual color components of the image, which average values are calculated by the average value calculating unit; calculates, according to the maximum values, gains for adjusting to a maximum range the average values of the pixel values of the individual color components constituting other images; and outputs the gains as gains of the individual color components to be supplied to a signal amplifying unit. The signal amplifying unit amplifies all pixels of color components of the image according to the gains of the individual color components supplied.

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: 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 processing apparatus has an input portion for receiving video signals, an illumination sensor for detecting illumination of an environmental light, a corrector for correcting the video signals, and a controller for controlling the corrector to correct the video signals in accordance with distribution of luminance or hue or saturation of the video signals and with the detected illumination when any change occurs in the video signal. The apparatus further has a detector for detecting a change of the video signals in accordance with a mean value of luminance of the inputted video signals, a corrector for correcting the video signals, and a controller for controlling the correction portion to correct the video signals in accordance with distribution of luminance or hue or saturation of the video signals when the detector detects the change of the video signals.

Abstract: An image output/input system includes a phase comparator, an image synchronous signal generator, a sensor timing generator, a sensor, an image/color processing unit, and a video encoder. The phase comparator receives a digital signal and a vertical synchronous signal and compares their period and phase to generate a clock correction signal. The image synchronous signal generator receives the clock correction signal and adjusts a subsequent period of the vertical synchronous signal according to the clock correction signal. The sensor timing generator receives the vertical synchronous signal and generates the sensor control timing, and the sensor receives the sensor control timing and generates raw image data. The image/color processing unit receives the raw image data and deals with the image and color process of the raw image data to generate target image data. The video encoder receives the vertical synchronous signal and the target image data and encodes them to generate analog encoded image data.

Abstract: A method of determining when an image capture device with a rolling shutter is in an environment having a flickering illuminant by using autocorrelation or frequency analysis of difference vectors produced from first and second captured images.

Abstract: Disclosed are digital imaging devices that embody a method for eliminating modulated light effects in rolling shutter CMOS sensor images. The digital imaging device comprises an image sensor utilizing an electronic rolling shutter, a processor and firmware for implementing the methods. Embodiments of the method comprise detecting the presence of light modulation and the frequency of the light modulation, and synchronizing the exposure times to the modulation cycle time.

Abstract: An imaging apparatus includes an integrating unit to integrate pixel values of pixels in each of a plurality of areas of an image; a holding unit to hold integration values generated by the integrating unit; an operating unit to operate a waveform of a differential value between integration values of the same areas in two images having a phase difference of flicker of 180 degrees; an extracting unit to extract phase and amplitude of the flicker on the basis of the waveform operated by the operating unit; a selecting unit to select a waveform of the flicker on the basis of shutter speed of the imaging apparatus; and a correcting unit configured to correct the pixel values of the pixels by using a correction value based on the flicker waveform selected by the selecting unit and the phase and amplitude extracted by the extracting unit.

Abstract: A system and method in which a fluorescent light flicker characteristic of an XY addressing type image pickup device such as a CMOS image pickup device is accurately detected and reliably and sufficiently reduced. This is achieved through signal processing without using a photosensitive element regardless of the level of a video signal of a subject and the type of a fluorescent lamp. A signal In?(x,y) is an RGB primary color signal or a luminance signal, each containing a flicker component. The signal In?(x,y) is integrated over a duration of time equal to or longer than one horizontal period, and a difference value between the integrated values of adjacent fields is normalized by the average value of the integrated values of three consecutive fields.

Abstract: An exposure control unit 15 controls a charge accumulation time for a CMOS sensor 10. The CMOS sensor 10 captures an image P1 with a charge accumulation time T1 and an image P2 with a charge accumulation time T2. The charge accumulation time T1 does not cause a flicker in an image under a light source blinking at a first blink cycle. The charge accumulation time T2 is different from the charge accumulation time T1. A difference image generation unit 17 generates a difference image DP that emphasizes to show a difference in luminance of the images P1 and P2. A flicker detection unit 18 detects a flicker occurrence in the image P2 based on a difference in luminance between P1 and P2 appearing in the difference image DP.

Abstract: A video camera includes an image sensor. The image sensor repeatedly outputs an object scene image captured on an imaging surface. A CPU detects a luminance component of the object scene image outputted from the image sensor, i.e., an AE/AWB evaluation value, and also detects a high-frequency component of the object scene image outputted from the image sensor, i.e., an AF evaluation value. Moreover the CPU executes a flicker determining process for determining whether or not a flicker is occurred based on the luminance component of the object scene image. However, prior to the flicker determining process, whether or not there is a dynamic object in the object scene is determined based on the high-frequency component of the object scene image. The flicker determining process is prohibited when there is the dynamic object while it is permitted when there is no dynamic object.

Abstract: An NTSC imaging apparatus, in which the shutter speed is set to a first value other than N/120 second, and a flicker detecting process is performed on a video signal obtained at the first shutter speed to extract a particular frequency component. When the level of this frequency component is higher than a threshold value, photographing is conducted under fluorescent light with a power supply frequency of 50 Hz. When the level is not higher than the threshold value, the shutter speed is set to a second value other than N/100 second, and a flicker detecting process is performed on a video signal obtained at the second shutter speed to extract a particular frequency component. When the level of this frequency component is higher than a threshold value, photographing is conducted under fluorescent light with a power supply frequency of 60 Hz.

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: A digital camera capable of accurately detecting flicker even while a video image is displayed on a display device is provided. In a digital camera, a video image is displayed on a display device 40 serving as a viewfinder for photographing based on a display video signal supplied from a CMOS image sensor 120 while image data based on a recording video signal supplied from the CMOS image sensor 120 is recorded in a recording unit 50. The digital camera detects flicker based on a video signal supplied from a group of pixel circuits which do not supply the display video signal among the group of pixel circuits forming the CMOS image sensor 120.

Abstract: A flicker frequency detection method includes defining a plurality of adjacent sensing sections of the same size on a display panel based on an M Hz frequency, an N Hz frequency and the panel resolution, calculating a reference average signal detected by a first sensing section, calculating a first average signal detected by an (n+1)th sensing section, calculating a second average signal detected by an (m+1)th sensing section, calculating a first difference value between the first and reference average signals, calculating a second difference value between the second and reference average signals, determining a relationship between the first and second difference values, and outputting corresponding signals based on the relationship between the first and second difference values. The ratio between the area covered by the first through mth sensing sections and that covered by the first through nth sensing sections is proportional to the ratio between M and N.

Abstract: An improved display screen flicker detection and correction system. The system includes a flicker detection component. A test pattern is placed on a display screen to be tested and corrected. The flicker detection component is placed on or near the display screen. The flicker detection component senses the change in light level that results from the flickering screen. The display system is then adjusted to minimize flicker.

Abstract: There are provided a camera body, an interchangeable lens, and an imaging apparatus that enable to perform appropriate exposure control even when the zoom magnification is changed by a user after the camera body sets the diaphragm value of the interchangeable lens. The interchangeable lens, which includes a diaphragm and a movable lens and is mountable to a camera body, have a request signal receiving unit that receives a request signal requesting to send information on brightness of the interchangeable lens, the request signal being sent from the camera body on a frame-by-frame basis; a brightness information calculating unit that calculates information on brightness of the interchangeable lens based on states of the diaphragm and the movable lens when the request signal receiving unit receives the request signal; and a brightness information sending unit that sends the calculated information on brightness of the interchangeable lens to the camera body.

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: An apparatus for measuring the power frequency of a light source includes a photo-sensor, a modulator, and a logic unit. The photo-sensor generates an electrical signal that is responsive to light incident thereon from the light source. The modulator generates a modulated signal based on the electrical signal that toggles at a rate substantially proportional to the power frequency of the light source. The logic unit is coupled to receive the modulated signal and determine its toggling frequency.