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Fractional pixel filter system and its filter method for video frequency decoding chip

A fractional pixel, video decoding technology, applied in the field of digital image encoding and decoding technology and system-on-chip, can solve the problems of low data multiplexing rate, waste of memory bandwidth, complex low-pass filter algorithm, etc., to improve decoding efficiency and save decoding. effect of time

Active Publication Date: 2007-03-21
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

However, the low-pass filter algorithm is very complicated. If it is implemented by software, it will take nearly one-third of the time of the decoder, and the decoding efficiency is low.
At the same time, the data multiplexing rate is also low, wasting memory bandwidth

Method used

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  • Fractional pixel filter system and its filter method for video frequency decoding chip
  • Fractional pixel filter system and its filter method for video frequency decoding chip
  • Fractional pixel filter system and its filter method for video frequency decoding chip

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Embodiment Construction

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0049] Please refer to Figure 1, which shows the positions of integer samples, half samples, and quarter samples of the brightness component of the reference image, where the positions marked with uppercase letters are integer samples, and those marked with lowercase letters are Half and quarter sample positions.

[0050] Predicted values ​​at half sample positions are passed through a 4-tap filter F 1 (-1, 5, 5, -1) is calculated. Predicted values ​​at quarter-sample positions are passed through a 4-tap filter F 2 (1, 7, 7, 1) is calculated.

[0051] The calculation process of one-half sample is as follows:

[0052] One-half sample b: first use F 1 Filter the nearest 4 integer samples in the horizontal direction to obtain the intermediate value b'=(-C+5D+5E-F); the final predicted value b=Clip1 ((b'+4)>>3).

[0053] One-half sa...

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Abstract

This invention relates to a video decoding chip fraction picture element filter system and its filter method including a memory, a data transmission circuit with a register array, a low-pass filter with four data selectors based on a pipeline. The data transmission circuit is connected with an external memory and stores the integral pixel matrix received from the external memory controller interface in a memory in the line mode, the register array circulation movers from the integral position delivered by the memory and sends the motion integral pixel to the low-pass filter for carrying out 1 / 2 and 1 / 4 filter. The data selector controls the data flowing mode to output fraction pixel position.

Description

technical field [0001] The invention belongs to the technical field of digital image encoding and decoding technology and system on chip technology (SOC, system on chip), and specifically relates to a video decoding chip fractional pixel filtering system and filtering method based on the AVS standard. Background technique [0002] Effective video codec technology is the key to realizing multimedia data storage and transmission, and advanced video codec technology usually exists in the form of standards. Currently typical video compression standards include the MPEG series of international standards launched by the Moving Picture Experts Group (MPEG, Moving Picture Expert Group) under the International Organization for Standardization (ISO); the H.26x series of video compression standards proposed by the International Telecommunication Union (ITU), And my country's own video and audio coding standard AVS is being formulated. [0003] Motion search is the most important part o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N19/117H04N19/182H04N19/80
Inventor 解晓东吴迪贾惠柱生滨郑俊浩张鹏邓磊张力张帧睿王忠立朱胜利王晓辉颜伟成高文
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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