FILTERING METHOD AND THE LOW PASS FILTER FOR ADAPTABLE EDGE LOW PASS FILTER

摘要

An adaptive edge preservation lowpass filtering method in accordance with the present invention is disclosed.;Edge preserving lowpass filtering method that has no weight to obtain high frequency components such as noise that is hard to see in the low frequency region of the image, that is, the region with little gray level change, and preserves the edge portion, is the center of the filter. Counting the number K of pixels satisfying a condition where the absolute value of the difference between the gray level Z5 of the pixel and the gray level of the center pixel and the pixel Zi out is less than or equal to a certain threshold Tv. Determining whether the number K of pixels satisfying the condition is greater than an arbitrary number M, if the number K is greater than M, indicating that the gray of the pixels satisfying the condition is determined. Averaging the level and substituting the mean value with a new pixel value.;Therefore, according to the present invention as described above, the result is excellent in noise reduction in the flat area of the image, and has the effect that the edge portion of the image is preserved without deterioration.