Abstract: Disclosed is an image data processing apparatus including a brightness detection part, a moving average calculation part, a change quantity detection part, a false correction determination part, and a correction part. The brightness detection part detects brightness of pixels in a prescribed range of each frame from image data acquired from an imaging device. The moving average calculation part calculates a moving average of prescribed cycles of the brightness to calculate a temporal average brightness value. The change quantity detection part detects a change quantity of an inclination of a waveform constituted of the temporal average brightness value. The false correction determination part determines a likelihood of false correction to the image data based on information representing a change of the inclination. The correction part corrects the image data acquired from the imaging device based on the determination result of the false correction determination part.

Abstract: Provided is a flicker noise detection apparatus for detecting flicker noise in a video signal. The apparatus includes: a positional displacement detection module for detecting a positional displacement of an image across a plurality of sequential frames including, as a latest frame, a current frame of the video signal; a reference frame generation module for correcting, based on the positional displacement detected, the positional displacement of the image across the plurality of sequential frames, and generating a reference frame, based on the plurality of sequential frames corrected; and a flicker noise detection module for detecting, based on the reference frame generated and the current frame, flicker noise in the current frame.

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: Anti-flicker camera and image capture method are disclosed. According to the disclosed method, exposure integrals of different lines of an image sensed by a camera device are calculated. The exposure integrals are compared with reference exposure integrals of the plurality of lines, respectively, to calculate exposure integral offsets for the lines. The reference exposure integrals are estimated from at least one reference image. The positive and negative changes of the exposure integral offsets are statistically analyzed and, accordingly, it is determined whether there is light flicker from background illumination and an auto-exposure control module of the camera device is controlled based on the determination.

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 apparatus is provided in which a flicker is prevented. The imaging apparatus includes an imaging part that includes an optical system to form an image of a subject and an imaging element to generate an image signal by photoelectrically converting an optical image of the subject formed by the optical system, an image processing part to perform an image processing on the image signal, a display part/operation part having at least display and setting functions, a luminance change detection part to detect change of luminance of the subject, a signal processing part to calculate flicker amounts at respective frequencies based on signal intensities with respect to luminance change information acquired by the luminance change detection part, and a control unit to cause the display part/operation part to display the flicker amounts at the respective frequencies calculated by the signal processing part.

Abstract: The subject matter discloses a color rolling reduction apparatus, comprising: an antenna (99) for receiving signals; a detector (330) linked to the antenna, for detecting low signals from the signals received by the antenna, the low signals are associated with a power supply connected to a light source; and an amplifier for amplifying the low signals; wherein the low signals that are amplified are for synchronizing of a functionality of a camera.

Abstract: An apparatus and method for processing an image of an image signal projected through a digital camera lens are provided. The apparatus includes an image sensor module for transforming an optical signal into an electric signal, to generate and output an image signal, and a light receiving module for detecting a light source. The apparatus also includes a light source characteristic detector for detecting a frequency of the light source, a white balance controller for controlling a white balance, a color corrector for removing interferences of red, green, and blue channels, and a gamma corrector for performing a gamma correction. The apparatus further includes an auto color adjustment controller for identifying a kind of light source based on the frequency of the light source, and controlling a white balance gain of the image signal based on the kind of the light source.

Abstract: An apparatus and method for detecting flicker in a camera module is provided. The method including generating a first image frame and a second image frame, setting up a first sampling area in the first image frame and a second sampling area in the second image frame, sampling a plurality of horizontal lines from among all of the horizontal lines contained in each of the first sampling area and the second sampling area, accumulating brightness values of pixels located on each of the sampled horizontal lines to generate first accumulated brightness values for the first image frame and second accumulated brightness values for the second image frame, and detecting flicker based on the first accumulated values and the second accumulated values, wherein the first sampling area and the second sampling area have the same sizes and the same horizontal starting points but have different vertical starting points.

Abstract: A method of reducing flicker in video is described. The method includes the steps of: determining an initial target frame color channel statistic value (Rt,Gt,Bt) based on at least the current video frame information; for each subsequent frame, determining a current frame color channel statistic value (Rc,Gc,Bc); for each subsequent video frame, updating the target frame color channel statistic value (Rt,Gt,Bt) based on at least the current video frame information, wherein the target value changes at a slower rate than the flicker frequency of the video frame; and for each color channel of each subsequent video frame, individually adjusting the current pixel values so that the current frame color channel static value (Rc,Gc,Bc) matches the target frame color channel statistic value (Rt,Gt,Bt).

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: There is provided an image processing device including a first flicker component calculation unit that calculates a flicker component of a first exposure image which is a photographed image of a first exposure time, a second flicker component calculation unit that calculates a flicker component of a second exposure image which is a photographed image of a second exposure time different from the first exposure time, a first exposure image flicker correction unit that performs flicker correction on the first exposure image by applying the flicker component of the first exposure image calculated by the first flicker component calculation unit and generates a flicker-corrected first exposure image, and a second exposure image flicker correction unit that performs flicker correction on the second exposure image by applying the flicker component of the second exposure image calculated by the second flicker component calculation unit and generates a flicker-corrected second exposure image.

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: A flicker detecting apparatus for a camera module includes a processor. The processor includes a brightness values reading module, a calculating module, and a determining module. The brightness values reading module reads out a number of brightness values from a number of pixels of pictures captured by the camera module. The calculating module calculates out brightness values differences between the pixels. The determining module compares the brightness values differences with a preset value to determine whether the camera module is acceptable.

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: 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 image processing apparatus can correct band-like unevenness due to flickering with a simple arrangement. For this purpose, the image processing apparatus includes a detecting unit which detects, in the image to be processed, a band-like unevenness occurring along a direction substantially perpendicular to the scanning direction of the imaging sensor included in the image-capturing apparatus used when performing image-capturing of the image, a calculating unit which calculates a correction amount to correct the band-like unevenness, and a correcting unit which corrects the band-like unevenness in the image based on the correction amount.

Abstract: An imaging apparatus capable of increasing the accuracy of detection of an outside flash of light. The imaging apparatus includes an imaging unit that sequentially captures images using a CMOS-type image sensor, and a flash determination unit that determines the presence/absence of a flash based on the images captured by the imaging unit. The flash determination unit monitors an amount of change in the average luminance level of a predetermined region in the lower area of the screen in the images captured by the imaging unit, and determines the presence/absence of a flash based on the amount of change in the average luminance level.

Abstract: An image pickup apparatus capable of performing favorable focusing operation when image signals are read out from an image pickup device at a high speed while flickers are occurring. Flickers are detected from image signals outputted from the image pickup device, while the image signals outputted from the image pickup device is stored. The image signals outputted from the image pickup device and the image signals stored in a first memory are synthesized depending on the flicker detection result. A position of a focus lens is adjusted by selectively using any one of the image signals outputted from the image pickup device and the synthesized image signal. When the image pickup device performs reading images in a cycle shorter than a flicker cycle, image synthesis is performed depending on the brightness of the image signals outputted from the image pickup device.

Abstract: The invention discloses a method and device for image filtering in the field of communication technologies, the method including: acquiring image data of a pixel dot of a current row to be filtered and a corresponding pixel dot of at least one adjacent row; obtaining contrast information containing a transparency value, of the pixel dot of the current row and the pixel dot of the adjacent row respectively by resolving the image data of the pixel dot of the current row and the pixel dot of the adjacent row; generating a filter coefficient according to the transparency value of the pixel dot of the current row and the transparency value of the corresponding pixel dot of the adjacent row; and performing filtering on the pixel dot of the current row with the filter coefficient.

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: 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: 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: 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: 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 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: 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: Anti-flicker camera and image capture method are disclosed. According to the disclosed method, exposure integrals of different lines of an image sensed by a camera device are calculated. The exposure integrals are compared with reference exposure integrals of the plurality of lines, respectively, to calculate exposure integral offsets for the lines. The reference exposure integrals are estimated from at least one reference image. The positive and negative changes of the exposure integral offsets are statistically analyzed and, accordingly, it is determined whether there is light flicker from background illumination and an auto-exposure control module of the camera device is controlled based on the determination.

Abstract: A flicker detection device includes an accumulation section that divides a screen into a plurality of areas to perform accumulation of pixel levels, writing and reading of the accumulation result to and from a memory area allocated to every area, thereby accumulating the pixel levels in the area for every area, an accumulation result memory that stores the accumulation results of the accumulation section, an area discrimination section that discriminates whether or not every area is a still image area using the accumulation result obtained by the accumulation section and the accumulation result stored in the accumulation result memory, and a flicker level calculation section that averages the accumulation results of the areas discriminated as the still image area by the area discrimination section, and performs an operation using the averaged accumulation result and the accumulation result obtained by the accumulation section, thereby calculating a flicker level.

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: An imaging system including a frame rate setter and an exposure evaluator. The frame rate setter sets a frame rate used in a focusing operation. The frame rate is set faster than a normal frame rate. The exposure evaluator evaluates the exposure of a focusing image based on pixel signals read out from a focusing image area at the frame rate. The frame rate is reduced when the exposure is evaluated as an underexposure and the focusing operation is carried out at a reduced frame rate.

Abstract: Print log information representing an output sheet count in each of a plurality of image forming devices is acquired. Next, print log information of output products is acquired for each department or user capable of using the image forming device. Then, total print log information representing the output sheet count of the plurality of image forming devices is acquired. When the sum of output sheet counts specified by the print log information acquired first coincides with the sum of output sheet counts specified by the total print log information, the print log information or total print log information acquired for the department or user is decided as the sum of output sheet counts of the department or user.

Abstract: An apparatus and method for suppressing color rolling are provided. The apparatus includes a digital signal processor which detects first motion information on a current frame and second motion information on at least one of a plurality of neighboring frames, calculates a gain based on the first and second motion information, and applies the gain to at least one channel of the current frame.

Abstract: Methods are described for processing an image signal for double or multiple exposure cameras in order to reduce fluorescent artifact effects.

Abstract: Example embodiments are directed to time division of an exposure for image acquisition. More specifically, example embodiments reduce flicker in images taken with an image sensor, such as a CMOS image sensor. At least one example embodiment discloses a method of acquiring an image with an image sensor. The method includes determining, by a controller of the image sensor, an exposure time for image acquisition and dividing, by the controller, the exposure time into at least two active time intervals. The at least two active time intervals are separated by at least one inactive time interval.

Abstract: A flicker detection method of an image sensing device is disclosed. The image sensing device includes a sensor and a processor. The method comprises steps of: sequentially detecting multiple frames according to a frame rate, wherein each of the multiple frames includes a light signal; generating a light intensity information based on the light signals; determining a sampling window according to a predetermined detection frequency and the frame rate; dividing the light intensity information into multiple light intensity groups according to the sampling window; distinguishing a feature of each light intensity group, and recording an index position of each feature of the light intensity groups; calculating, individually, a difference between the index positions of the adjacent light intensity groups; and determining whether the differences are patterned, in order to determine whether the light intensity information corresponds to a flicker.

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 imaging system includes: an image module configured to produce image frames at a frame rate F, the image module being configured to capture first and second portions of each of the image frames at different times; a frequency determination module, communicatively coupled to the image module, configured to determine frequency components associated with the first and second portions over a plurality, N, of the image frames; and a flicker analysis module, communicatively coupled to the frequency determination module, configured to determine whether any of the frequency components of the first and second portions are indicative of perceptible flicker.

Abstract: An imaging apparatus includes an imaging sensor, a control unit that instructs the imaging sensor to capture a first picture with a first charge accumulation time based on a light source having a first frequency and to capture a second picture with a second charge accumulation time based on a light source having a second frequency different from the first frequency, and a difference picture generation unit that generates a difference picture by using the first and second pictures.

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 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 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: 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: Disclosed is a method for integrating an image sensor capable of removing a flicker noise without causing any burdens on a hardware due to setting up additional logics. The method for integrating an exposure time of an image sensor employing a line scan method, including the steps of: performing an integration to a first line when an integer multiple of a light source frequency is different from an integration time; and performing an integration to a second line at a phase substantially equal to a phase in which the integration to the first line is started.

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: Techniques for detecting and addressing image flicker are disclosed. An imaging device that senses a distorted image and subsequently removes the distortion during processing can utilize an analysis module that obtains statistics indicative of image flicker prior to removing the distortion. An imaging device that features a diode for illuminating a field of view can utilize the diode as a photosensor to determine one or more flicker statistics to determine whether ambient lighting conditions are of the type that cause image flicker.

Abstract: Techniques for detecting and addressing image flicker are disclosed. An imaging device that senses a distorted image and subsequently removes the distortion during processing can utilize an analysis module that obtains statistics indicative of image flicker prior to removing the distortion. An imaging device that features a diode for illuminating a field of view can utilize the diode as a photosensor to determine one or more flicker statistics to determine whether ambient lighting conditions are of the type that cause image flicker.

Abstract: An imaging apparatus includes: an image sensor including a plurality of charge storage-type photoelectric conversion elements disposed along a first and a second direction; a rolling shutter control unit that executes storage control to store electrical charges in a first element row and in a second element row with different timing for electrical charging, the first element row including a plurality of the charge storage-type photoelectric conversion elements along the first direction and the second element row including a plurality of the charge storage-type photoelectric conversion elements along the first direction at a different position along the second direction; a detection unit that detects light emission timing indicating a light emission cycle of each of a plurality of color components in light entering the image sensor; and a start instruction unit that engages the rolling shutter control unit to start the storage control based upon the light emission timing.

Abstract: An imaging apparatus including an imaging sensor, a control unit that instructs the imaging sensor to capture a first image with a first charge accumulation time and to capture a second image with a second charge accumulation time different from the first charge accumulation time, under a light source blinking at a first blink cycle, and a flicker detection unit that detects a flicker occurrence in the first or second image based on a difference in luminance between the first image and the second image. The imaging sensor captures the first image and the second image at a same shutter speed.

Abstract: An image sensor has improved functions so as to automatically eliminate a flicker noise. For the purpose, the image sensor includes a pixel array for capturing information about an image provided from the outside and having N pixel rows and M pixel columns for maximizing a feature of reacting to light, wherein M and N are integers, respectively, a flicker noise detective pixel unit containing X pixel rows, which has a form extended from the N pixel rows of the pixel array, and M pixel columns, wherein each pair of X pixel rows has an identical exposure time and X is an even number, and a flicker noise for controlling an exposure point for the flicker noise detective pixel unit and detecting the flicker noise by using outputs of the flicker noise detective pixel unit.