Patent ID: 6181385
Filing Date: 2001-01-30
Classification: H04N

Abstract:
Method for processing transitional regions in a picture signal, the picture signal comprising a sequence of digital pixel values, comprising the steps of:forming a processing block with a processing pixel value for which a corrected pixel value is to be calculated and a number of adjacent pixel values, which surround said processing pixel value;determining the maximum and minimum pixel values in the processing block;defining the transitional region in said processing block by building a group of pixel values inclusive and in between the maximum and minimum pixel values;determining the mean value between the maximum and minimum pixel values;splitting the transitional region into at least one upper and lower section, wherein the mean value represents the border between upper and lower section;assigning the processing pixel value to one of the upper and lower sections or to the mean value;allocating a corresponding correction value to the processing pixel value, in accordance with a predetermined transfer function having at least one corresponding lower and upper section, in order to increase, to reduce or to leave unchanged the processing pixel value.