US 5,475,434 AGranted

Blocking effect attenuation apparatus for high definition television receiver

AssigneeGoldstar Co., Ltd.

InventorJin G. Kim

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Abstract

A blocking effect attenuation apparatus for a high definition television receiver, includes a variable length decoder for receiving encoded video data and extracting therefrom a quantization level, a quantized DCT coefficient and a motion vector, an inverse quantizer for generating a DCT coefficient by convening the quantized DCT coefficient from the variable length decoder into frequency domain data according to the quantization level from the variable length decoder, an inverse DCT unit for restoring the DCT coefficient from the inverse quantizer into spatial domain data, a frame memory for storing video data of a previous frame, an adder for adding data output from the frame memory to data output from the inverse DCT unit to output video data of a present frame, a motion estimator for transferring the motion vector from the variable length decoder to the frame memory, a block analysis circuit for generating a filtering flag in response to the quantization level and the quantized DCT coefficient from the variable length decoder, and a block filtering circuit for selectively filtering blocks of the video data of the present frame from the adder in response to the filtering flag from the block analysis circuit.

Claims7

Dependent claims

A blocking effect attenuation apparatus for a high definition television receiver, comprising:

variable length decoding means for receiving compressed encoded digital video data and extracting therefrom a quantization level value, a quantized discrete cosine transform (DCT) coefficient value and a motion vector value;
inverse quantization means for generating a recovered DCT coefficient value by converting the quantized DCT coefficient value extracted by said variable length decoding means into a frequency domain value according to the quantization level value extracted by said variable length decoding means and for outputting the recovered DCT coefficient value;
inverse DCT restoring means for restoring the recovered DCT coefficient value output from said inverse quantization means into spatial domain data and for outputting same;
frame memory means for storing digital video data of a previously occurring video frame and for outputting same;
addition means for adding output data from said frame memory means and output data from said inverse DCT restoring means to output video data of a presently occurring video frame;
motion estimation means for transferring the motion vector value extracted by said variable length decoding means to said frame memory means;
block analysis means for generating a filtering flag in response to the quantization level value and the quantized DCT coefficient value extracted by said variable length decoding means;
and
block filtering means for selectively filtering blocks of the video data of the presently occurring video frame output from said addition means in response to the filtering flag generated by said block analysis means.

6 more elements

Dependencies are inferred from the claim text.