公开(公告)号：SG115542A1

公开(公告)日：2005-10-28

申请号：SG200303239

申请日：2003-05-21

Applicant: ST MICROELECTRONICS ASIA

Inventor： PATRICIA CHIANG WEI YIN ,  LUCAS Y W HUI

IPC: G06T5/00 ,  G06T5/20 ,  H04N5/14 ,  H04N5/21 ,  H04N9/77

Abstract: A processor for enhancing an input luminance signal including: a means for calculating a chroma edge value associated with the input luminance signal; a means for measuring a luminance gradient associated with the input luminance signal; a peaking filter for processing the input luminance signal; a gain adjustment circuit having a gain function that is adjustable relative to the calculated chroma edge value, the gain adjustment circuit being operable to adjust the magnitude of the output of the peaking filter wherein: in a first range of luminance gradients, the output is an attenuated version of the input; in a second range of luminance gradients the output is directly proportional to the input; in a third range of luminance gradients, the output is inversely proportional to the input; wherein said enhanced luminance signal is the sum of the input and output of the peaking filter.

公开(公告)号：SG115543A1

公开(公告)日：2005-10-28

申请号：SG200303347

申请日：2003-05-17

Applicant: ST MICROELECTRONICS ASIA

Inventor： YONG HUANG ,  PATRICIA CHIANG WEI YIN ,  LUCAS Y W HUI ,  GOH KWONG HUANG

IPC: H04N5/52 ,  H04N9/64 ,  H04N9/68 ,  H04N9/77

Abstract: A method of colour saturation compensation in a video signal is disclosed. The method includes the steps of: processing a luminance signal component of the video signal; determining whether the processing of the luminance signal results in a change in chrominance saturation; if the step of determining reveals that the chrominance saturation has changed, applying a chrominance compensation signal to the chrominance signals to counteract the effects of chrominance saturation, wherein said step of applying a compensation signal include the steps of: generating a compensation signal which is dependent on hue and luminance ratio (output luminance signal / input luminance signal). Apparatus for performing the method is also disclosed.

公开(公告)号：SG115540A1

公开(公告)日：2005-10-28

申请号：SG200303013

申请日：2003-05-17

Applicant: ST MICROELECTRONICS ASIA

Inventor： PATRICIA CHIANG WEI YIN

IPC: G06T5/00

Abstract: An edge enhancement system, including a selective edge controller for determining one or more properties of an edge of image data, and for generating one or more weighting factors on the basis of properties of the edge; and a scaling module for scaling an edge enhancement signal by the weighting factors to control the degree of edge enhancement. The image data may represent a still or moving (i.e., video) image. A max-min search circuit determines maximum and minimum turning points closest to the center of the data processing window and that are located on opposing sides of the window, to determine values and locations of maximum and minimum pixels of the edge. An edge-directed prefiltering circuit reduces the amplification of edge fuzziness by smoothing close the edges vertical prior to enhancement. An aliasing protection circuit reduces the visibility of sawtooth defects on predominantly horizontal diagonal edges.