Patent ID: 7840071

Claim:
A method of identifying regions of different content in an image comprising: using a processing unit to: divide image data into a plurality of pixel blocks; extract features of said pixel blocks; and classify the content of said pixel blocks based on extracted features; and wherein said extracting comprises for each pixel block: convolving a magic square filter with the pixels of the pixel block and summing the results; calculating the percentage of background pixels in the pixel block; calculating the edge density of the pixel block; and calculating the average saturation of the pixel block; and wherein said classifying comprises: initially classifying the content of each pixel block based on the magic square filter convolving and summing result and the percentage of background pixels; and in the event that the content of a pixel block cannot be classified to a desired level of confidence, subsequently classifying the content of the pixel block based on at least one of the calculated edge density and average saturation.