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H264 encoder and image transformation, quantization and reconstruction method thereof

An encoder and inverse transformation technology, which is applied in the field of image processing, can solve the problems of waste of resources, incompatibility with 8×8 transformation, and low throughput rate, so as to improve the running speed, improve the utilization rate of hardware resources, and save hardware resources. Effect

Active Publication Date: 2012-11-07
OMNIVISION TECH (SHANGHAI) CO LTD
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Problems solved by technology

[0008] Although the above-mentioned H.264 encoder multiplexes two adders, the throughput rate is not high, the calculation speed is slow, and only the block size of 4×4 is considered, it is not compatible with the transformation of 8×8, and it still cannot be integrated To realize the whole process including DCT transformation, quantization and image reconstruction, there is a waste of resources

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  • H264 encoder and image transformation, quantization and reconstruction method thereof
  • H264 encoder and image transformation, quantization and reconstruction method thereof
  • H264 encoder and image transformation, quantization and reconstruction method thereof

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Embodiment Construction

[0073] The H.264 encoder and its encoding method proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0074] Such as figure 2 As shown, the present invention provides a kind of H.264 encoder 1, comprising:

[0075] The control unit 11 is configured to receive an externally input macroblock start signal, and send a macroblock start signal to other units to notify other units to start the corresponding calculation of the macroblock;

[0076] The residual unit 12 is used to obtain the macroblock data and predicted macroblock data of the current block from an external memory 2, and calculate the residual error of the current block, preferably, by combining the macroblock data and the predicted macroblock data of the current block The predicted macroblock data is subtracted to calculate the residual of the current block;

[0077] The forward transformation / quantization unit 13 is use...

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Abstract

The invention provides an achieving method of hardware of an H264 encoder and mainly provides a uniform multiplex logic unit for forward DCT / Hadamard transformation and quantization, reversed quantization and reversed DCT / Hadamard transformation operation, and hardware resource is saved to large extent. By means of matching of a residual unit, a forward transformation / quantization unit, a reversed transformation / quantization unit and a reconstruction unit, an image transformation, quantization and reconstruction process in an H264 standard is achieved. Pipeline operation in an encoding process increases operation speed, utilizes the complex logic unit to the largest extent, and increases hardware resource use rate.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an H.264 encoder and methods for image transformation, quantization and reconstruction. Background technique [0002] The H.264 standard is a high-performance digital video codec standard proposed by the Joint Video Team (JVT). Its biggest advantage is its high data compression rate. Under the condition of the same image quality, the compression ratio of H.264 can reach twice that of MPEG-4. The reason for such a high compression ratio is that H.264 contains a series of new features, such as multi-frame reference , variable block size motion compensation, and high-precision sub-pixel motion compensation, deblocking filter, etc. [0003] The H.264 standard uses integer discrete cosine transform (ie, DCT transform) and quantization to eliminate the correlation in the image signal and reduce the dynamic range of image coding to achieve the purpose of compression. The DCT-...

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Application Information

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IPC IPC(8): H04N7/26H04N7/50
Inventor 吴蕾郑宇驰
Owner OMNIVISION TECH (SHANGHAI) CO LTD
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