Method of determining a feature of an image using an average of horizontal and vertical gradients

摘要

An image processing method performed by a processor for processing a plurality of pixel values in an image data representing a two-dimensional image, the image processing method including defining a block representing a part of the two-dimensional image corresponding to a predetermined number of pixels in rows and columns, obtaining an average of a gradient of pixel value on the basis of the pixel values of adjacent pixels in the block along each of at least one of rows and at least one of columns, generating a product of the average of the gradient pixel value along each of at least one of the rows and the average of the gradient pixel value along each of at least one of the columns, and generating a double summation of the products of the gradient pixel values of each of the rows and the columns.