Method for detecting/correcting bad pixel in image sensor

A method for correcting a bad pixel in an image sensor by an image capturing system having the image sensor, comprising:

• a first step of creating and storing a plurality of image frames of an object;
• a second step of scanning pixels in the image frames;
• a third step of storing, when a bad pixel is detected in the image frames, the location of the bad pixel as a bad block location in a memory;
• and
• a fourth step of correcting the luminance value of the bad block by calling the bad block location stored in the memory in an image capture operation,
• wherein the fourth step comprises:
• a fifth step of dividing the image frame into a plurality of sub-blocks by calling the block according to the bad block location stored in the memory;
• a sixth step of detecting the luminance value of the first sub-block;
• a seventh step of calculating the difference ratio of the current sub-block by setting the difference ratio of the sub-block to the ratio of the luminance value difference between the previous sub-block and the current sub-block;
• a eighth step of comparing the difference ratio of the current sub-block with a predetermined threshold ratio and determining whether to correct the luminance value of the current sub-block according to the comparison result;
• and
• a ninth step of repeating the seventh step and the eighth step by detecting the luminance value of the next sub-block until the last sub-block, and
• wherein the difference ratio of the sub-block is calculated by {The absolute value of the difference between the luminance value of the previous sub-block sub_B(x−1) and luminance value of the current sub-block sub_Bx}÷{The maximum value which is one of the luminance value of the previous sub-block sub_B(x−1) and the luminance value of the current sub-block sub_Bx}.