Image correction method using approximately non-linear regression approach and related image correction circuit

An image correction circuit, arranged for processing an original image to obtain a corrected image, the image correction circuit comprising:

• a distance calculation unit, wherein regarding each pixel of the original image, the distance calculating unit is arranged for calculating a horizontal distance and a vertical distance between the pixel and a reference point in the original image;
• a ratio parameter determining unit, coupled to the distance calculation unit and arranged for determining a horizontal ratio parameter and a vertical ratio parameter according to the horizontal distance and the vertical distance between the pixel and the reference point in the original image;
• and
• an approximately non-linear regression adjustment unit, coupled to the ratio parameter determining unit and arranged for performing an approximately non-linear regression calculation on the horizontal ratio parameter, the vertical ratio parameter and a coordinate of the pixel to obtain a position of the pixel in the corrected image.