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Method and system for detecting intra-coded pictures and for extracting intra DCT precision and macroblock-level coding parameters from uncompressed digital video

一种编码参数、内编码的技术，应用在图像检测系统领域

Inactive Publication Date: 2005-05-04
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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However, special care must be taken to identify and process previously compressed digital video

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  • Method and system for detecting intra-coded pictures and for extracting intra DCT precision and macroblock-level coding parameters from uncompressed digital video
  • Method and system for detecting intra-coded pictures and for extracting intra DCT precision and macroblock-level coding parameters from uncompressed digital video
  • Method and system for detecting intra-coded pictures and for extracting intra DCT precision and macroblock-level coding parameters from uncompressed digital video

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Embodiment Construction

[0019] In the following description, for purposes of illustration and not limitation, specific details are set forth such as particular structures, interfaces, techniques, etc., in order to provide a thorough understanding of the present invention. For purposes of simplicity and clarity, detailed descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0020] In order to facilitate the understanding of the present invention, it will be combined with figure 1 to illustrate background information related to MPEG2 encoding. Such as figure 1 As shown, the hierarchical structure of the code format according to the MPEG2 standard is shown. The top layer of the structure includes a video sequence consisting of a plurality of GOPs (Group of Pictures), where one picture corresponds to one page. Each image is divided into a plurality of slices, and each slice includes a plurality of ...

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Abstract

The present invention relates to a method and system for extracting coding parameters from uncoded video data. The encoded video data is decoded using an MPEG decoder, resulting in decompressed video data. A DC calculation operation is performed to recover an intra-DC precision level from the decompressed video data such that the decompressed video data is classified as an intra-coded image when the intra-DC precision level is less than a first predetermined threshold. If the inner DC precision level is equal to the first predetermined threshold, a discrete cosine transform (DCT) is performed to generate a set of DCT coefficients for at least one AC frequency band in the decompressed video data. Then, an average quantizer step size is calculated from the AC data, and if the average quantizer step size is greater than a second predetermined threshold, the decompressed video data being processed is classified as an intra-coded image. Thereafter, the quantization matrix data of the decompressed video data of one frame is extracted. Additionally, the quantizer scale and DCT type values ​​for each block of decompressed video data are extracted.

Description

technical field [0001] The present invention relates to an image detection system and method for extracting video signal parameters from uncompressed digital video data. Background technique [0002] To improve transmission efficiency, images containing a large amount of data are usually compressed and then transmitted over the transmission medium to a decoder that can be used to decode the encoded video data. A commonly used encoding method is based on the discrete cosine transform (DCT). The DCT method is adapted to international standard coding methods such as JPEG (Joint Photographic Experts Group) and MPEG (Moving Picture Experts Group). [0003] In the digital video processing chain, uncompressed (or decoded) digital video data undergoes further downstream processing, such as artifact reduction, quality enhancement, re-encoding, and editing. However, special care must be taken to identify and process previously compressed digital video. For example, newer displays s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/60G06T9/00H03M7/30H04N19/625H04N19/85
CPCH04N19/172H04N19/196H04N19/60H04N19/103H04N19/126H04N19/136H04N19/44H04N19/85H04N19/124
Inventor Y·陈
Owner KONINK PHILIPS ELECTRONICS NV