System and Method for Adaptive Frame Re-compression in Video Processing System
a video processing system and frame buffer technology, applied in the field of video processing systems, can solve the problems of degrading affecting the quality of reconstructed video, and the size of the frame buffer will also grow with the picture size, so as to reduce the size of the frame buffer
Inactive Publication Date: 2013-09-19
MEDIATEK INC
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The patent describes a video decoding system that uses compression to reduce the amount of data needed to store video frames. This system includes a decoder that reconstructs video data from a bitstream, a compression module that adds additional data to the reconstructed video data, and a storage module that stores the compressed video data. The compression module uses information from the decoder and the video bitstream to control the amount of data added. The system also includes a system monitor that can identify which information is being used by the decoder. The technical effect of this system is to reduce the amount of data needed to store video frames, making it more efficient and reliable.
Problems solved by technology
Furthermore, the size of the frame buffer will also grow with the picture size.
The noise introduced by lossy frame compression will degrade quality of the reconstructed video.
For example, the noise in an I-frame may cause more severe quality degradation than a P-frame or a B-frame.
Nevertheless, conventional frame compression does not take into consideration of the nature of reference frames.
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[0020]FIG. 1 illustrates an exemplary video decoder incorporating frame compression to reduce memory and bandwidth required associated with reference frame buffer. Video decoder 120 receives bitstream from bitstream buffer 110. After video data is reconstructed by decoder 120, the reconstructed video data may have to be stored in the frame buffer. For example, the currently reconstructed video data may be used as reference frame by a later processed frame. In another example, the currently reconstructed video data cannot be outputted for display yet if the reconstructed video data for a frame in a prior display order is not ready. Therefore, there is a need for storing reconstructed video data in frame buffer. For a decoder incorporating frame compression, the reference frame in frame buffer 130 is stored in a compressed format. A frame compression encoder with a corresponding decoder (codec) 132 is used for storing frame data in a compressed form and retrieving the compressed frame...
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Method and system of video decoding incorporating frame compression to reduce frame buffer size are disclosed. The method adjusts parameters of the frame compression according to decoder system information or syntax element in the video bitstream. The decoder system information may be selected from a group consisting of system status, system parameter and a combination of system status and system parameter. The decoder system information may include system bandwidth, frame buffer size, frame buffer status, system power consumption, and system processing load. The syntax element comprises reference frame indicator, initial picture QP (quantization parameter), picture type, and picture size. The adaptive frame compression may be applied to adjust compression ratio. Furthermore, the adaptive frame compression may be applied to a decoder for a scalable video coding system or a multi-layer video coding system.
Description
FIELD OF THE INVENTION[0001]The present invention relates to video processing system. In particular, the present invention relates to system and method for adaptive frame re-compression in video processing system.BACKGROUND[0002]Motion-compensated inter-frame coding has been widely used in various international video coding standards, such as MPEG-1 / 2 / 4, H.264 / AVC and the emerging HEVC (High Efficiency Video Coding) standard. In an inter-frame coding system, the motion information is derived using one or more reference frames, where the reference frame may be a frame before or after the current frame in the display order. The reference frame used for motion estimation / compensation is always a previously reconstructed frame so that the encoder and the decoder can perform motion compensation accordingly with little or no side information. At the encoder side, frame buffer is used to store one or more reference frames in order to perform motion compensation. At the decoder side, frame ...
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IPC IPC(8): H04N7/26
CPCH04N19/105H04N19/159H04N19/172H04N19/428H04N19/156H04N19/44H04N19/61
Inventor LIU, TSU-MINGCHANG, YUNG-CHANGJU, CHI-CHENG
Owner MEDIATEK INC