Correction method and device for handling column fixed pattern noise of image sensor and related image sensing device

A correction device for handling column fixed pattern noise of an image sensor, comprising:

• an offset updating unit, configured to generate a plurality of updated offset values according to a plurality of base offset values, wherein each of the plurality of updated offset values corresponding to one column of pixel values among a plurality of columns of pixel values generated by the image sensor;
• a calculating unit, coupled to the offset updating unit, configured to generate a plurality of columns of corrected pixel values according to the plurality of updated offset values and the plurality of columns of pixel values;
• and
• a gain stretching unit, coupled to the calculating unit, configured to determine a compensation gain according to the plurality of updated offset values and accordingly generate a plurality of columns of output pixel values according to the compensation gain and the plurality of columns of corrected pixel values.

An image sensing device, comprising:

• an image sensor, configured to provide a plurality of columns of pixel values;
• a correction device for handling column fixed pattern noise of the image sensor, comprising:
• an offset updating unit, configured to generate a plurality of updated offset values according to a plurality of base offset values, wherein each of the plurality of updated offset values corresponding to one column of pixel values among the plurality of columns of pixel values;
• a calculating unit, coupled to the offset updating unit, configured to generate a plurality of columns of corrected pixel values according to the plurality of updated offset values and the plurality of columns of pixel values;
• and
• a gain stretching unit, coupled to the calculating unit, configured to determine a compensation gain according to the plurality of updated offset values and accordingly generate a plurality of columns of output pixel values according to the compensation gain and the plurality of columns of corrected pixel values.