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Pixel exposure method

An exposure method and pixel technology, applied in the field of pixel exposure, can solve the problems of loss of spatial resolution, loss of time resolution, etc., and achieve the effect of suppressing motion artifacts

Inactive Publication Date: 2021-03-02
GPIXEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the traditional method of improving the dynamic range of image sensors either loses spatial resolution (effective array size), or loses temporal resolution (frame rate), and cannot achieve the best of both worlds.

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Embodiment Construction

[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0039] In order to suppress the motion artifacts of the image when shooting a high-speed moving object, the present invention changes the control timing of the pixels, after the exposure of the first frame, first Instead of reading out the charge, after the charge is stored, the second frame of exposure is performed immediately. After the second frame of exposure is completed, the charges generated by the two exposures are read out separately, which can shorten the time interval between the two exposures, thereby suppressing the image. Motion artifacts are produced.

[0040] In the pr...

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Abstract

The invention provides a pixel exposure method, and the method comprises the following steps: S1, performing first frame exposure on all pixels of an image sensor by adopting a global shutter exposuremode, and transferring first exposure charges generated after exposure of each pixel from a photodiode to a storage diode; S2, resetting the photodiode, performing second frame exposure on all pixelsof the image sensor by adopting the global shutter exposure mode again, and transferring a second exposure charge generated after each pixel is exposed to a storage diode from the photodiode; S3, transferring all the first exposure charges and all the second exposure charges to the floating diffusion node from the storage diode in sequence and reading out the charges line by line. According to the invention, by changing the control time sequence of the pixels, the motion artifact of the image can be effectively inhibited when the object moving at a high speed is shot on the premise of not losing the time resolution and the space resolution.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a pixel exposure method for realizing high dynamic range. Background technique [0002] The human eye is capable of detecting a dynamic range greater than 160dB, whereas most image sensors today can only record a dynamic range of about 70dB. Therefore, people's demand for high dynamic range image sensors has never stopped. There are many solutions available today to increase the dynamic range of imaging systems. [0003] A common way to improve the dynamic range is to collect two images of the same scene and then synthesize them. The exposure time of the two images is one long and the other short. figure 1 As shown, the short exposure is performed first to read the short exposure result, and then the long exposure is performed to read the long exposure result. For short-exposure images, pixels with weaker light signals lose information due to readout noise. For long-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235H04N5/341H04N5/378
CPCH04N23/73H04N25/40H04N25/75H04N25/616H04N25/771
Inventor 马成王欣洋刘洋李扬郭杨钰李卓谷建超
Owner GPIXEL
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