Patent ID: 8818136

Claim:
An image interpolation method based on matrix in an image processing system, comprising steps of: (A) determining a gradient direction of an image region formed by a pixel dot array containing an interpolation point, wherein Step (A) further comprises Step (A1) as follows: (A1) comparing the pixel value of each pixel dot on a diagonal in the pixel dot array containing the interpolation point with the pixel values of pixel dots on the other diagonal respectively, so as to find out whether the image region formed by the pixel dot array is a flat region to further determine the gradient direction; (B) determining a triangle for interpolation in the image region based on the gradient direction and position of the interpolation point; and (C) calculating the pixel value of the interpolation point based on the pixel values of pixel dots corresponding to three vertexes of the determined triangle and the distance between the interpolation point and one of three vertexes of the determined triangle.