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Fixed-pattern noise removal method

A noise and pattern technology, applied in the field of fixed pattern noise removal, can solve problems such as large memory

Active Publication Date: 2019-01-04
NOVATEK MICROELECTRONICS CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this method needs to record and store the entire shading light for different parameter control (temperature, gain value, exposure time), which requires a very large memory

Method used

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Embodiment Construction

[0042] Please refer to figure 2 , figure 2 It is a schematic diagram of a fixed pattern noise removal (fixed pattern noise, FPN) process 20 according to an embodiment of the present invention. Such as figure 2 As shown, the fixed pattern noise removal process 20 is used in an image sensor, which includes the following steps:

[0043] Step 200: start.

[0044] Step 202: According to the plurality of compensation pixel values ​​in each column of pixels, calculate each compensation value corresponding to each column of pixels.

[0045] Step 204: According to the compensation values ​​of the pixels in each column, compensation is performed when sampling the pixel values ​​of multiple photosensitive regions in a photosensitive region to generate a plurality of compensated pixel values ​​of the photosensitive region; wherein, the plurality of photosensitive regions in the photosensitive region The plurality of photosensitive region pixel values ​​are generated by photosensiti...

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Abstract

The invention discloses a fixed-pattern noise removing method, which is used in an image sensor. The fixed-pattern noise removing method comprises steps of calculating each compensation value corresponding to each pixel column according to a plurality of compensation pixel values in each pixel column, and carrying out compensation when a plurality of photosensitive area pixel values in a photosensitive area are sampled according to each compensation value of each pixel column so as to generate a plurality of compensation photosensitive area pixel values, wherein the plurality of photosensitive area pixel values are photosensitively generated by the plurality of photosensitive area pixels in the photosensitive area.

Description

technical field [0001] The invention relates to a fixed pattern noise removal method, especially a fixed pattern used in an image sensor, which only needs to calculate the compensation values ​​corresponding to the pixels in each column for compensation, thereby saving memory space and reducing computational complexity. Noise removal method. Background technique [0002] Generally speaking, in an image sensor (image sensor), since the pixels used for sensing images are inconsistent in size, pitch, and efficiency, and a row of samplers, such as correlation double sampling (CDS), are sequentially There will be errors in sampling the photosensitive pixel values ​​by column; that is, a specific sampler corresponds to a specific column of pixels, so when the samplers in a column of samplers are not uniform in process and design, the pixel values ​​of the captured column pixels will be different. Due to the error caused by the unevenness of the sampler, there is noise in the vert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/357
Inventor 袁奕雯徐纬孟昭宇
Owner NOVATEK MICROELECTRONICS CORP
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