Image decoding and image transcoding method and system

A decoding and transcoding technology, which is applied in the field of image decoding and image transcoding methods and systems, and can solve problems such as memory usage conflicts

Inactive Publication Date: 2008-04-09
SUNPLUS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Another object of the present invention is to provide an image decoding and image transcoding method and system, so as to solve the problem of memory usage conflict

Method used

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  • Image decoding and image transcoding method and system
  • Image decoding and image transcoding method and system
  • Image decoding and image transcoding method and system

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Embodiment Construction

[0036] FIG. 3 shows a block diagram of the image decoding and image transcoding system of the present invention. The system decodes, displays and transcodes a video data stream (Video Stream). The video data stream has a sequence of frames (Frame), and each frame has a first field (Field) and a second field after decoding. Wherein, the first field is called Top Field, and the second field is called Bottom Field.

[0037] The system includes a memory 310 , a decoding unit 320 , a display unit 330 , a transcoding unit 340 and a control unit 350 . The memory 310 has a plurality of frame buffers 311 (Frame Buffer) for temporarily storing image data during image decoding and image transcoding. In this embodiment, the memory 310 preferably has four frame buffers 311 .

[0038] The memory 310 can be a synchronous dynamic random access memory (SDRAM) or a double data rate dynamic random access memory (Double Data Rate DRAM). The double data rate dynamic random access memory (DDR D...

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Abstract

The invention relates to an image decoding and image transcoding method and a system, which decode, display and transcode video data stream. When last frame decoding finishes, a decoding program checks whether any frame buffer is available. If it is, decoding the prior frame, holding in the frame buffer and marking the frame as available, wherein, the frame mark is relevant to the frame buffer. When the last display finishes, a display program checks whether the frame buffer holds the frame after decoding. If it does, reading the decoding frame in the frame buffer and displaying the decoding frame. When the last frame decoding finishes, a transcoding program checks whether the frame buffers holds the frame after decoding. If it does, reading the decoding frame in the frame buffer and transcoding the decoding frame.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to an image decoding and image transcoding method and system. Background technique [0002] Generally, when transmitting an audio-visual data stream, due to the limitation of network bandwidth, it is often necessary to perform video transcoding on the audio-visual data stream to convert and reduce the frame rate (reduced frame-rate) or resolution of the video data stream. Rate (resolution), which is convenient for transmission in congested networks. That is, in video transcoding, the frame rate (frame-rate) of dynamic image compression data is often reduced to another dynamic image compression data, that is, the frame replacement rate is reduced to further reduce the data bit rate (bit-rate). rate), in order to meet the demand for video transmission with insufficient bandwidth. [0003] figure 1 A block diagram of an existing image decoding and image transcoding ...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N19/172H04N19/40H04N19/423H04N19/46
Inventor 林建佑阎大贵潘廷建
Owner SUNPLUS TECH CO LTD
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