Method for determining a quality measure for a video image and apparatus for determining a quality measure for a video image
AssigneeThomas Licensing
InventorsDe Bing Liu, Zhi Bo Chen, Xiao Dong Gu
Life of this patent
Estimating the term…
Abstract
Accurately estimating the image quality of video is still difficult, especially when there is no reference video available. A method for determining a quality measure for a video image comprises selecting a measuring point, such as a MB, determining a context area around the measuring point, calculating a variance of pixel values in the context area, calculating a variance of pixel values in the measuring point, calculating a relation between the two variances of pixel values, and averaging said relations for a plurality of measuring points, wherein a quality measure for a video image is obtained.
Claims14
A method for determining a quality measure for a video image, comprising steps of
- selecting a first encoding unit of the video image as a measuring point;
- determining a context area of the selected first encoding unit, the context area comprising said selected first encoding unit and at least portions of a plurality of second encoding units that are directly adjacent to the selected first encoding unit;
- calculating a variance of pixel values in the context area;
- calculating a variance of pixel values in the selected first encoding unit;
- calculating a relation between the variance of pixel values in the selected first encoding unit and the variance of pixel values in the context area;
- and
- averaging for a plurality of selected first encoding units said relations, wherein a quality measure for a video image is obtained.
An apparatus for determining a quality measure for a video image, comprising
- selecting means for selecting a first encoding unit of the video image;
- determining means for determining a context area of the selected first encoding unit, the context area comprising said selected first encoding unit and at least portions of a plurality of second encoding units that are directly adjacent to the selected first encoding unit;
- processing means for calculating a variance of pixel values in the context area;
- processing means for calculating a variance of pixel values in the selected first encoding unit;
- processing means for calculating a relation between the variance of pixel values in the selected first encoding unit and the variance of pixel values in the context area;
- processing means for averaging for a plurality of selected first encoding units said relations, wherein a quality measure for a video image is obtained;
- and
- controller means for controlling the selecting means, determining means and processing means for repeating their operation for a plurality of first encoding units.
Dependencies are inferred from the claim text.