Image processing device and control method thereof

An image processing device for acquiring output values of a plurality of pixels and processing image signals, the image processing device comprising:

• an acquisition unit configured to acquire a first output value from a pixel and acquire a second output value determined from a pixel adjacent to the pixel;
• a detection unit configured to perform defective pixel detection by calculating a first evaluation value of the pixel from the first output value and the second output value and comparing a second evaluation value calculated from the first evaluation value and the second output value with a threshold value;
• a pixel correction unit configured to correct a pixel signal of a defective pixel detected by the detection unit;
• and
• a shading correction unit configured to perform shading correction using the pixel signal corrected by the pixel correction unit.

A control method to be executed by an image processing device for acquiring output values of a plurality of pixels and processing image signals, the control method comprising:

• acquiring a first output value from a pixel and acquiring a second output value determined from a pixel adjacent to the pixel;
• and
• performing, by a detection unit, defective pixel detection by calculating an evaluation value of the pixel from the first output value and the second output value and comparing the evaluation value with a threshold value,
• wherein the detection includes calculating, by the detection unit, a second evaluation value using the second output value and a first evaluation value derived from the first output value and the second output value and detecting the pixel as a defective pixel if the second evaluation value is greater than the threshold value.

A control method to be executed by an image processing device for acquiring output values of a plurality of pixels and processing image signals, the control method comprising:

• acquiring a first output value from a pixel and acquiring a second output value determined from a pixel adjacent to the pixel;
• performing, by a detection unit, defective pixel detection by calculating a first evaluation value of the pixel from the first output value and the second output value and comparing a second evaluation value calculated from the first evaluation value and the second output value with a threshold value;
• correcting, by a pixel correction unit, a pixel signal of the detected defective pixel;
• and
• performing, by a shading correction unit, shading correction using the pixel signal corrected by the pixel correction unit.