Image sharpness device and method

[0027] The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.

[0028]FIG. 4 shows a 3×3 pixel image unit 40 of which labels A˜I represent pixels respectively. FIG. 5 is a flowchart of an image sharpness method 500 according to an embodiment of the invention. In step S502, a plurality of sharpness gray level increments for a current pixel is determined in accordance with a non-linear visual function shown in FIG. 6 and gray level differences between the current pixel and the neighboring pixels of the current pixel. Proceeding to step S504, the sum of the sharpness gray level increments is used as a total sharpness gray level increment and the sum of the total sharpness gray level increment and the gray level of the current pixel is