Pixel processing circuit and reading method thereof, and image sensor

A pixel processing circuit configured for being applied to an image sensor of a bilateral parallel ADC readout architecture, the pixel processing circuit comprising:

• a pixel array comprising a plurality of pixel units arranged in a Bayer array,
• an Analog-to-Digital Converter (ADC) module comprising a plurality of analog-to-digital converters, and
• a plurality of switch selection modules;
• wherein a number of the switch selection modules is set to be half of a number of the analog-to-digital converters;
• the plurality of analog-to-digital converters comprise first analog-to-digital converters located on a first side of the pixel array and second analog-to-digital converters located on a second side of the pixel array opposite to the first side;
• each of the switch selection modules is configured to have a first unit disposed between the first side of the pixel array and one of the first analog-to-digital converters, and a second unit disposed between the second side of the pixel array and one of second analog-to-digital converters;
• wherein the switch selection modules are configured to switch a communication between the pixel units and the first and second analog-to-digital converters on the opposite first and second sides of the pixel array, such that signals of green pixel units are read by the first analog-to-digital converters, and signals of remaining color pixel units are read by the second analog-to-digital converters.