Patent ID: 8165415

Claim:
An image processing system, comprising: a global frequency detecting unit, for detecting frequency of a plurality of input pixels to calculate a vertical frequency level of the input pixels along a vertical direction and a horizontal frequency level of the input pixels along a horizontal direction; a gradient-calculating summation unit, for calculating a set of gradient brightness levels according to a portion of the input pixels along a set of directions respectively; a threshold-adjusting device coupled to the global frequency detecting unit, for adjusting a first threshold and a second threshold based on the relationship of the vertical frequency level and the horizontal frequency level; and an image blending device coupled to the gradient-calculating summation unit, for determining a cross-angle direction with the first threshold from the threshold-adjusting device and for determining a minimum-angle direction with the second threshold from the threshold-adjusting device, wherein the image blending device generates the first pattern associated with the cross-angle direction and the second pattern associated with the minimum-angle direction and blends the first pattern with the second pattern based on the weighting factor value.