Intra-frame image brightness block prediction device and method

Abstract

The invention discloses a device and a method for predicting a luminance block of an intra-frame image. The problems in the prior art that the design of a control circuit is complicated and the reusability of an arithmetic circuit is bad are mainly solved. The device comprises a sub-block reference pixel position storing module, an integral device control module, an address counter module, a redundant microcode storing module, a reference pixel storing module, an arithmetic circuit module and a predicted pixel series-parallel converting module. The method comprises the following steps of: 1, respectively storing reference pixel position information and the redundant microcode of the luminance block of a typical sub-block; 2, obtaining the reference pixel position information of the luminance block of a current sub-block according to input information; 3, decoding to obtain a reference pixel and a microcode of the luminance block of the current sub-block according to the reference pixel position information; and 4, carrying out arithmetic to generate a predicted pixel under the control of the microcode, processing the predicted pixel through series-parallel conversion, and sending the processed predicted pixel to an exchange stage of encoding the luminance bock of the intra-frame image. The device and the method have the advantages that the control circuit has a simple design, the data processing speed is quick, and the resource consumption is less.

Description

technical field [0001] The invention belongs to the technical field of image processing, and further relates to an intra-frame image brightness block prediction device and method in the field of video and image coding. The invention can be used in the intra-frame image prediction stage in the H.264 digital video and image coding standard to realize fast and efficient prediction of intra-frame image brightness blocks. Background technique [0002] In digital video and image coding systems, since the luma blocks to be processed have the characteristics of multiple types and multiple prediction modes, the intra image luma block prediction stage causes frequent data exchange and diverse operations for the entire coding system. In the general-purpose intra-frame image brightness block prediction device, a state machine is used to control data exchange and an operation circuit to process data. The device adopting the above method needs to solve the problems of complex design of th...

AI Technical Summary

Problems solved by technology

Although this method uses the features with correlation between prediction points to speed up data update, which alleviates the problem of high bandwidth and high frequency of data exchange to a certain extent, there are still shortcomings: in practice, due to the free correlation between prediction pixels, The degree is large, and it is difficult to quantify it specifically, resulting in high design complexity of the control unit and high consumption of circuit resources, which is very unfavorable for implementation on a field programmable gate array (FPGA), especially when the current processing block has multiple prediction modes. The bit width and number of control signals grow exponentially

Although this method uses two selection units to select the input data and output data of the processing unit to broaden the applicability of the processing unit circuit, and can solve the problem of poor reusability of the operation circuit to a certain extent, there are still shortcomings: selecting the control unit and The complexity of the control circuit design is not effectively reduced. Although the processing unit can realize all predictive operations, it is not a simplified structure, resulting in low data processing speed and high resource overhead of the device.

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