Decoding method, decoder and decoding device

Abstract

A decoder divides an image into rectangles, decodes dynamic image compressed data based on dynamic compensation, develops the decoded data into an image, and stores the image at an image memory. The decoder is provided with a code data decoding unit that decodes compressed data, and stores coefficient data and dynamic vector data at a memory unit; a coefficient data processing unit that carries out reverse quantizing processing and reverse frequency conversion processing in accordance with the coefficient data read out from the memory unit, so as to generate a residual image; a dynamic vectordata processing unit that reads out a reference image from the image memory in accordance with dynamic vector data read out from the memory unit to generate a rectangular predictive image; a dynamic compensating unit that adds up the residual image and the predictive image to generate a decoded image, and stores it at the image memory; and a control unit that controls operation timing in the decoder. The dynamic vector data processing unit includes a predictive image buffer to store a predictive image for at least two rectangles or more, and a predictive image generation notifying unit that notifies the control unit by a predictive image ready signal that the predictive image for at least two rectangles or more have been generated, and the control unit controls the operation timing in response to the predictive image ready signal.

Description

technical field [0001] The present invention relates to a decoding method, a decoder and a decoding device, and more particularly to a decoding method, a decoder and a decoding device for decoding compression-coded video data when receiving digital broadcasting or reproducing DVD video data. Background technique [0002] The moving images viewed through digital broadcasting or DVD recording are composed of about 30 digital images per second. Therefore, from the viewpoint of the limited frequency band or the capacity of the storage medium, it is difficult to reproduce these moving image data without any processing. In most cases, the broadcast wave is used as a carrier wave to transmit or store in a storage medium such as a DVD. In actual applications, some kind of compression processing is performed on moving image data. In general, these compression processes are performed in accordance with protocols stipulated by standardization bodies, taking into account the publicity o...

AI Technical Summary

Problems solved by technology

So for example if figure 2 The block division of macroblock numbers 4, 5, and 6 that require motion compensation is complex, such as image 3 The processing time required to read the reference image of the macroblock numbers 4, 5, and 6 is long, and the predicted image generation process of the predicted image generation unit 53 is delayed, so the motion compensation process of the motion compensation unit 6 for the macroblock number 6 The start of the macroblock is waited, the transition to the next macroblock processing is delayed at each pipeline stage, and the performance of the decoder as a whole deteriorates

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