Multi-slope calibration for the image sensor of the column parallel A / D conversion of

The present application relates to a multiple slope for the image sensor of a column-parallel analog calibrating A / D conversion. In one aspect the method comprises acquiring an analog image pixel array data, and from the pixel array read out the analog image data. By using the multi-slope voltage ramp performs analog / digital A / D conversion to the analog image data into digital image data. At least some of adjusting the digital with the calibration data of the image data. Also disclosed other methods, devices and systems.