| 摘要 |
<p>A method is proposed for processing transitional regions in a picture signal. The picture signal comprises a sequence of digital pixel values. A number of adjacent pixel values (Y04, Y10 - Y18, Y24; C00 - C08), which contains a processing pixel value (Y14, C04), are combined to form a processing block. A corrected pixel value (YER, CTI0) is calculated for the processing pixel value. To this end, the maximum and minimum pixel values (Y6, Y0; C4, C0) are first of all determined in the processing block, in order to define the transitional region. The transitional region is then split into a number of sections on the basis of the magnitude of pixel value. Finally, a determination is made as to the section in which the processing pixel value is located. The processing pixel value (Y14, C04) is then allocated a corresponding correction value in order to increase, to reduce or to leave unchanged the processing pixel value, in accordance with a predetermined transfer function (11). The method is explained, in particular, on the basis of an example for picture signal edge correction and for improving colour transitions in a video picture. <IMAGE></p> |
