Pixel flicker suppression method of pulse image sensor
An image sensor and pixel technology, which is applied in the field of image processing, can solve problems such as bad sensory effects, pixel grayscale fluctuations, pulse interval fluctuations, etc., and achieve the effect of rich reconstruction information, enhanced stability, and improved quality
Active Publication Date: 2021-09-03
TIANJIN UNIV
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[0003]In the above working mode, the pixels are stored after being triggered and read out at the next nearest readout time point, which will cause time errors, resulting in fluctuations in the acquired pulse interval
The pulse interval reconstruction method uses the inverse relationship between the pulse interval and the light intensity to reconstruct the image, so the fluctuation of the pulse interval will cause the pixels of the image to flicker, which brings bad sensory effects and also brings problems to the application of the image. adverse effects, restricting the development of sensors
[0004] Theoretically, the pulse interval under uniform light should be stable, but the existence of errors leads to two types of pulse interval codes under uniform light, which will make the pixel gray scale fluctuate with time
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[0029]There are fluctuations in the pixel pulse interval sequence, resulting in pixel flickering in the image reconstructed by the pulse interval reconstruction formula. The pulse interval reconstruction formula is as follows:
[0030]
[0031] In the formula, the uint8() function indicates that the reconstructed grayscale is the grayscale value represented by 8bit, and has the function of rounding, and L is used to adjust the brightness interval of the image.
[0032] figure 2 This is the processing flow chart of the anti-flicker algorithm. In order to eliminate the flicker of the pixel, it is necessary to deal with the fluctuation of the pulse interval code. During the processing, the pulse interval sequence is divided into pulse interval sequence units under different illumination, and then the fluctuation of the pulse interval under each illumination is equalized. The basis is as follows: according to the correlation of the pulse interval sequence, the pulse interval d...
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The invention relates to the field of image processing of CMOS image sensors, and aims to provide a flicker suppression method for adaptively dividing illumination and balancing pulse intervals on the basis of the high correlation of a sensor pulse sequence and the regular characteristic of pulse interval fluctuation under uniform light. The invention aims to realize a good image flicker removal effect and enhance the stability of a reconstructed image. Therefore, the technical scheme adopted by the invention is as follows: the pixel flicker suppression method comprises the following steps: segmenting a pulse interval sequence into pulse interval sequence units under different illuminance during processing, and then balancing the fluctuation of the pulse interval under each illuminance. The method is mainly applied to the image processing occasion of the CMOS image sensor.
Description
technical field [0001] The invention relates to the field of image processing of a CMOS image sensor, in particular to a pixel flicker suppression method of a pulse image sensor. Background technique [0002] Pulse image sensor draws on the characteristics of asynchronous pulsing and multi-cell parallelization of biological visual information, and represents scene information with continuous pulse signals in the time domain, which greatly reduces the amount of data and has great potential in machine vision and dynamic scene capture. application value. The pulse train image sensor quantifies light intensity information through single-bit data, and its pixel structure is as follows figure 1 As shown, it includes an integration module, a comparison module, a self-reset module and a readout module. During operation, the integrated light intensity voltage of the photodiode drops, and the comparator triggers after reaching the threshold value; the comparison module outputs a pul...
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IPC IPC(8): H04N5/351H04N5/374
CPCH04N25/50H04N25/76H04N25/57
Inventor 徐江涛高坤高志远陈全民聂凯明王秀宇高静
Owner TIANJIN UNIV