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Monochrome frame detection method and corresponding device

A detection method, monochrome technology, applied in the direction of using detectable carrier information, color TV parts, color TV, etc.

Inactive Publication Date: 2007-04-11
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitations of MPEG-2, some existing methods do not provide sufficient or reliable performance, which is a drawback as it usually seeks by additional and often expensive methods involving operations in the pixel or audio domain. site

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  • Monochrome frame detection method and corresponding device
  • Monochrome frame detection method and corresponding device
  • Monochrome frame detection method and corresponding device

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Embodiment Construction

[0027] The principle of the present invention is based on the fact that the innovative coding tools of H.264 / AVC intra prediction mode can be conveniently applied for monochrome frame prediction purposes. The main idea is to observe the distribution of intra prediction modes for the (macro)blocks that make up an image. Monochrome images are detected when most of these blocks show the same or similar prediction mode: eg the number of these blocks can be compared to a fixed threshold. When most of the blocks in an image are coded according to a certain intra-prediction mode, the image exhibits very low spatial variation, whether monochromatic or containing repetitive patterns. For the previously described application of this algorithm to table of contents generation or keyframe extraction, these types of images with low or very low spatial variation (single color and repeating patterns) have to be discarded.

[0028] An implementation of the processing method according to the i...

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Abstract

The invention relates to a detection method applied to digital coded video data available in the form of a video stream comprising consecutive frames divided into macroblocks themselves subdivided into contiguous blocks. These frames comprise I-frames, coded independently, P-frames, predicted from a previous I- or P-frame, and B-frames, bidirectionally predicted from at least two frames between which they are disposed. According to the invention, the processing method comprises the steps of determining for each block of the current frame if it has been coded, or not, according to a predetermined intra prediction mode, collecting similar information for all the blocks of the current frame, for delivering statistics related to said intra prediction mode, analyzing said statistics for determining the number of blocks of said current frame which exhibit, or not, said intra prediction mode, and detecting in the sequence of frames, each time said number is greater than a given threshold, the occurrence of an image, or a sub-region of an image, which is either monochrome or with a repetitive pattern.

Description

field of invention [0001] The present invention relates to a method capable of automatically detecting a monochrome frame or a part of a frame in eg an H.264 / MPEG-4.AVC video stream. The method is mainly based on the use of new coding parameters introduced by H.264, which makes detection efficient and cost-effective. Background technique [0002] In recent years, international video coding standards have played an important role in promoting the adoption of digital video for a variety of professional and consumer applications. Most influential standards are developed by two organizations: ITU-T and ISO / IEC MPEG, sometimes jointly (for example: MPEG-2 / H.262). The latest jointly developed standard is H.264 / AVC, which is expected to be officially approved by ITU-T as Recommendation H.264 / AVC in 2003 and approved by ISO / IEC as International Standard 14496-10 (MPEG-4 Part 10 ) Advanced Video Coding (AVC). The main purpose of the H.264 / AVC standard was to achieve significant ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/34H04N7/50H04N5/14G06T7/40G06F17/30G11B27/28H04N19/593
CPCH04N19/00781H04N19/00763H04N7/345H04N7/50H04N19/593H04N19/61H04N19/103H04N19/176H04N19/51
Inventor M·巴比里D·布拉泽罗维克
Owner KONINK PHILIPS ELECTRONICS NV