Simulation image signal processing method for CMOS imaging sensor and circuit thereof

Abstract

This invention discloses a method for precessing analog image signals and its circuit of CMOS image sensor, which divides a pixel matrix into two symmetric odd and even arrays and sends related double sample values of each pixel signal to related two symmetric odd and even aray pixel simmulation image signal process circuits composed of a primary switch capacitance difference operation amplifying circuit only orderly at positive and negative half cycles of a line clock to carry out subtraction operation to eliminate dynamic noise and fixed mode noise of the circuit generated by the difference of sample circuits in different ranks and their drive circuit devices and realize control of color gain, exposal gain and dark background not influenced by the exposal background contol.

Description

technical field [0001] The invention relates to general image data processing, in particular to an analog image signal processing method and circuit of a CMOS image sensor which occupies a dominant position in low-end image and video information products. Background technique [0002] A signal processing circuit of an existing Complementary Metal-Oxide-Semiconductor Transistor Image Sensor (CMOS image sensor for short) includes a front-end analog image signal processing circuit and a back-end digital image signal processing circuit. The front-end analog image signal processing circuit includes a correlated double sampling (Correlate Doubled Sampling, referred to as CDS) circuit that can eliminate circuit fixed pattern noise (Fixed Pattern Noise, referred to as FPN), a color gain control circuit, an exposure control circuit and a dark background control circuit; The back-end digital image signal processing circuit includes an analog-to-digital converter and a digital image si...

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Problems solved by technology

The front-end image signal processing circuit of the existing CMOS image sensor uses multiple circuit modules or multi-level circuits to provide red, green 1 color, green 2 colors, and blue (referred to as R, G1, G2, B) signals to the pixel matrix respectively. For exposure gain control, color gain control and dark light background control, the processing circuit has a single function and complex circuit, which increases the chip area, increases the manufacturing cost, and restricts the miniaturization of the product. The FPN noise caused by the difference of stage circuit devices

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