Optimum scanning method for change coefficient in coding/decoding image and video

An encoding and double-scanning technology, which is applied in the field of encoding/decoding image signals, can solve the problems of reducing encoding efficiency, increasing the number of decoder bits, and data word length, etc.
CN1431828AInactive Publication Date: 2003-07-23SAMSUNG ELECTRONICS CO LTD
2 Cites 37 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SAMSUNG ELECTRONICS CO LTD
Publication Date
2003-07-23
Estimated Expiration
Not applicable Β· inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The method involves selecting a reference block from a set of reference blocks. A scanning order to scan the blocks that is to be coded of the reference blocks is generated. The blocks to be coded are scanned in the order of the generated scanning order. The probabilities of the non-zero coefficients occurring from the selected reference block are obtained. The scanning order is determined in descending order.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to a method of encoding / decoding image signals, in particular, to an optimal scanning method for transform coefficients in encoding / decoding of images and videos. Background technique

[0002] An image signal, such as an image or video, is passed through a discrete cosine transform (hereinafter referred to as "DCT") according to the Motion Picture Experts Group Phase 1 (MPEG-1), MPEG-2, MPEG-4, H.261, H.263 or JPEG compression or encoding. Also, the compressed or encoded image signal is decoded by inverse discrete cosine transform (hereinafter referred to as "IDCT"). Choosing an optimal scanning method is key when trying to improve encoding / decoding efficiency.

[0003] The scan mode described in US Patent No. 5,500,678 improves coding efficiency and was chosen as the scan mode for MPEG-4 intra-coding. The scanning pattern of the `678 uses a zigzag scanning pattern and a predefined scanning pattern.

[0004] Zigzag sca...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More