ENHANCING PERCEIVED SHARPNESS OF IMAGES

摘要

A method of enhancing the perceived sharpness of an image by controlling a spatial interpolation process. A pixel value spatial gradient measure is formed and used to generate a map of modified pixel positions. In this map, the pixel spacing is reduced when the gradient measure is high. By using this map of modified pixel positions to control an otherwise conventional interpolation process, an output image is formed having a perceived sharpness which is greater than that of the unmodified output of the interpolation process.

主权项

1. An apparatus for enhancing the perceived sharpness of an image, the apparatus comprising:
a gradient unit for forming a pixel value spatial gradient function for an input image which has pixels at respective input pixel position values, where the distance between each pixel and its preceding adjacent pixel is a fixed pixel-pitch value; a map generator for generating a map comprising a sequence of varied input pixel position values where the distance between each pixel and its preceding adjacent pixel is varied in accordance with said spatial gradient function; and a spatial interpolator generating an output image from the input image by forming for a pixel of the output image at an output pixel location a weighted sum of pixels in the input image; wherein the weighted sum is formed with reference to said varied input pixel position values.