Patent ID: 8750639
Filing Date: 2014-06-10
Classification: G06T

Abstract:
1. A computer-implemented method comprising: receiving an image having an initial resolution; automatically calculating a sharpening amount based on the image by utilizing at least one calculated statistical deviation of a histogram of the image at the initial resolution and at least one calculated statistical deviation of a histogram of the image at a second resolution; applying an unsharp mask filter to the image, the unsharp mask filter employing the sharpening amount and being represented by an expression where X′ is an adjusted value of a pixel in the image, X is a value of the pixel in the image before sharpening, A is the sharpening amount, and G(X) is a result of a convolution of X with a Gaussian kernel G with a standard deviation of one pixel, and where where τ is a positive threshold; and outputting a sharpened image relative to the image received.