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A Method of Removing Fixed Pattern Noise Based on Differential Reset

A fixed pattern noise, difference technology, applied in the field of image sensors, which can solve the problems of doubling the processing time and reducing the frame rate of the image sensor.

Active Publication Date: 2021-09-14
SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method of eliminating FPN will double the processing time of each line and reduce the frame rate of the image sensor

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  • A Method of Removing Fixed Pattern Noise Based on Differential Reset
  • A Method of Removing Fixed Pattern Noise Based on Differential Reset
  • A Method of Removing Fixed Pattern Noise Based on Differential Reset

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Embodiment Construction

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] Please refer to the attached Figure 1-3 , figure 1 It is a schematic diagram of the conventional HDR image sensor working mode based on single-frame segmented exposure. In one frame time, the pixels undergo two stages of exposure: one low full well exposure EXP_LFWC and one high full well exposure EXP_HFWC, two exposures After the end, read the exposure signal through two signal reads READ, the two signal reads include the reset signal read and the exposure signal read, and the soft reset is not performed in the prior art, only the hard reset that does not include the inflection point difference is read Signal, because the exposure signal contains the difference of the knee point, so the subtraction of the exposure ...

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Abstract

The invention discloses a method for removing fixed pattern noise based on differential reset, comprising the following steps: S01: performing single-frame segmented exposure on a pixel array; S02: performing signal reading of the pixel array, specifically including: S021: performing a soft reset : set the reset signal in the pixel unit to an intermediate voltage, and read the differential reset signal; S022: perform a hard reset: set the reset signal in the pixel unit to a high voltage; S023: turn on the transmission MOS tube, so that the exposure signal in the photodiode is transmitted To the floating diffusion area, read the difference pixel transmission signal; S03 : subtract the difference pixel transmission signal and the difference reset signal to obtain the exposure signal with the fixed pattern noise removed. The invention provides a method for removing fixed pattern noise based on differential reset, by introducing the same fixed pattern noise as the exposure signal when reading the reset signal, and eliminating the fixed pattern noise in the image through subtraction processing.

Description

technical field [0001] The invention relates to the field of image sensors, in particular to a method for removing fixed pattern noise based on difference reset. Background technique [0002] CMOS image sensors are widely used in daily life and technology due to their advantages of high integration, low power consumption and low cost. For CMOS image sensors, both high dynamic range and high frame rate are important indicators for measuring CMOS image sensors. For a CMOS image sensor with a small dynamic range, if you want to capture a small signal, you need to use a long exposure time, but such a large signal is saturated, and you cannot get large signal data; on the contrary, if you want to capture a large signal, you need to shorten the exposure time, but such a small signal Indistinguishable, no small signal valid data is obtained. Therefore, a high dynamic range is an important indicator of a CMOS image sensor. [0003] At present, the commonly used methods to improve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/365
CPCH04N25/67
Inventor 曾夕周璞严慧婕罗颖何学红
Owner SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT