Surround area detection and blending for image filtering
AssigneeDolby Laboratories Licensing Corporation
InventorsTsung-Wei Huang, Guan-Ming Su
Life of this patent
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Abstract
Methods and systems to detect and blend a surround area to avoid filtering artifact due to the area in image filtering are disclosed. The described methods include a compensation step and can be applied to arbitrary images with padded areas of arbitrary shape, such as letterboxes, pillar-boxes, ovals, or other shapes, including logos and close captions. Such methods detect the surround areas in the image with possible compression artifact and noise, and then perform blending to minimize the effects of the surround areas for any arbitrary image filtering operations.
Claims23
A method for detecting a non-active area in an image, the method comprising:
- calculating a histogram of a predefined area located at a boundary of the image;
- finding a peak and a width of the peak of the histogram;
- based on the peak and the width of the peak of the histogram, classifying a presence of the non-active area in the image, thereby generating a peak detection score;
- based on a ratio of the pixels that belong to the peak on a predefined minimum possible non-active areas at the predefined area located at the boundary of the image, classifying the presence of the non-active area in the image, thereby generating a boundary detection score;
- generating a total score based on a combination of the peak and the boundary detection scores, and
- detecting the presence of the non-active area based on the total score.
Dependencies are inferred from the claim text.