Image signal processor and image sensing device thereof

An operating method of an image signal processor, comprising:

• receiving a raw image and image information regarding the raw image from an image sensor;
• generating corrected pixel values by performing bad pixel correction on the raw image on an image patch-by-image patch basis;
• determining a state of local saturation of an image patch of the raw image;
• correcting the image patch with the corrected pixel values, with a replacement pixel value, or with raw pixel values depending on the state of local saturation of the image patch;
• and
• outputting the corrected image patch.

An image signal processor comprising:

• a pixel corrector configured to perform a bad pixel correction process on a raw image on an image patch-by-image patch basis;
• a local saturation monitor configured to
• determine a state of local saturation of an image patch of the raw image based on a number of saturated pixels and
• store location information of the saturated pixels;
• and
• a color distortion restorer configured to output a corrected image patch by correcting pixel values of the saturated pixels with a replacement pixel value or with raw pixel values.