Patent ID: 6614944
Filing Date: 2003-09-02
Classification: G06T

Abstract:
A method of adaptive spatial filtering for a digital image comprising:receiving an array of source pixels representative of at least a portion of the digital image, each of the source pixels having a value representative of a characteristic of the digital image; applying a window to the array of source pixels to generate an array of windowed pixels centered on a first source pixel; determining an upper threshold value and a lower threshold value from the array of windowed pixels; applying a spatial frequency filter to the array of windowed pixels to generate a filtered array of pixels including a reference pixel; combining the values of the first source pixel and the reference pixel to create an enhanced value; replacing the enhanced value with the lower threshold value if the enhanced value is less than the lower threshold value; and replacing the enhanced value with the upper threshold value if the enhanced value is greater than the upper threshold value.