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Methods and apparatus for automatically detecting image/video resolution and its color subsampling

A sub-sampling and image technology, which is applied in image communication, TV system components, digital video signal modification, etc., can solve the problems of time-consuming, no storage metadata, etc.

Inactive Publication Date: 2016-06-08
INTERDIGITAL CE PATENT HLDG
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Problems solved by technology

Many of these sequences are in eg YUV format and manually entering the video resolution and subsampling format before processing each one would be a time consuming task
The compressor will need to try every possible resolution one by one, and the process will be even more time-consuming in the case of YUV sequences, since YUV sequences do not have the ability to store metadata for resolution and subsampling information

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  • Methods and apparatus for automatically detecting image/video resolution and its color subsampling
  • Methods and apparatus for automatically detecting image/video resolution and its color subsampling
  • Methods and apparatus for automatically detecting image/video resolution and its color subsampling

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[0017] The principles described herein involve automatic detection of the resolution and color subsampling format of a digital image or video sequence from raw image or video data. In most discussions, when referring to video sequences, it should be noted that the same color subsampling format can also be applied to individual images.

[0018] Encodes and stores digital video sequences, as well as digital images, in a variety of resolutions and formats. Many common formats encode luma and chroma information separately, often at several different resolutions, using two chroma channels and one luma channel. Additionally, most formats use color subsampling such that the resolution of the individual chroma channels is smaller than that of the luma channel.

[0019] Digital compression schemes such as MPEG for video and JPEG for images typically use the YCbCr color format, but it is commonly referred to as YUV. The Cb and Cr chroma channels are chroma difference channels whose va...

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Abstract

Methods and apparatus for automatic detection of image or video resolution from raw image or video data are provided by the present principles. The methods find statistical metrics in the image or video data based on a look-up table of potential resolution and subsampling combinations. The methods compute statistics comprising spatial correlation, temporal correlation, and variances in addition to considering color sampling and luminance levels. The methods determine the strength of correlation between portions of the raw image or video data and find the best match between the data and a plurality of possible resolution and subsampling formats.

Description

technical field [0001] The present principles relate to methods and apparatus for automatic detection of image or video resolution and color subsampling formats from raw image or video data. Background technique [0002] Images or video sequences typically arrive in a studio environment at various resolutions and using one of several common color subsampling formats. The resolution and color subsampling format of these sequences are usually not known in advance. Larger studios handle many of these sequences. Many of these sequences are in eg YUV format, and manually entering the video resolution and subsampling format before processing each sequence would be a time consuming task. The compressor will need to try every possible resolution one by one, and the process will be even more time-consuming in the case of YUV sequences, since YUV sequences do not have the ability to store metadata for resolution and subsampling information. [0003] These problems are solved by the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/431H04N21/44H04N19/14H04N5/46
CPCH04N5/46H04N21/44008H04N21/4318H04N19/14H04N19/59H04N19/587
Inventor 朱立华安东·特赫苏斯·巴尔孔斯-帕劳理查德·埃德温·格德肯
Owner INTERDIGITAL CE PATENT HLDG
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