US 2001/0026588 A1 · Apparatus for receiving moving pictures

Abstract

A memory reducing device in an apparatus for receiving moving pictures is applied to the fields such as a digital television receiver, a digital video conference system and the like. The memory reducing device enables to reduce an external memory of an MPEG-2 video decoding chip and obtain standard deviations by predicting the current pixel using a pixel located at the highly-related direction which is determined by having the deviation estimating part measure the relation between the horizontal or vertical direction of the pixels adjacent there between and to be currently encoded. Moreover, the memory reducing device enables to increase a compression ratio as well as provide clear distinction of high definition by reducing the difference less than the bit precision of the current pixel by means of predicting the current pixel by selecting the pixel located at the highly-related direction with the above same method and performing quantization with the prediction.

Claims12

Dependent claims

A memory reducing device of an apparatus for receiving moving pictures, comprising:

an adder adding IDCT data to motion-compensated data wherein the IDCT data is obtained by a video decoder;
a deviation estimating part calculating a standard deviation from an output signal of the adder;
a storage buffer storing an output of the adder by macro block unit;
an ADPCM encoder performing ADPCM compression by applying the standard deviation to data of the macro block unit stored in the storage buffer;
a PCM buffer storing the ADPCM compressed data, quantization codes and the standard deviation;
and
a write memory reading the compressed data stored in the PCM buffer and storing the read data in an external memory.

4 more elements

A memory reducing device of an apparatus for receiving moving pictures, comprising:

an deviation estimating part calculating a standard deviation by using a difference between a current pixel and a high correlated pixel of video-decoded pixels prior to the current pixel;
a buffer storing values of the video decoded pixel by a macro block unit and outputting the values by a sub block unit smaller than the macro block unit;
and
an ADPCM compressing part outputting original pixel values of first rows of respective sub blocks outputted from the buffer, coding a difference between the high correlated pixel and the current pixel of the rest rows, and adjusting quantization intervals by applying the standard deviation when coding.

1 more element

Dependencies are inferred from the claim text.

Apparatus for receiving moving pictures

Life of this patent

Apparatus for receiving moving pictures

Life of this patent

Abstract

Claims12