Motion compensated prediction interframe coding system

Inactive Publication Date: 2001-03-13
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Thus, the motion compensated prediction interframe coding system according to the fourth aspect of the present invention can limit the amount of the generated codes and improve the picture of a block, which should be coded by using the intraframe coding method and has a fine pattern and of which the averaged value of gray levels of pixels is greater or equal to a predetermined value, by measuring the fineness of a pattern of each block of the luminance signal contained in the input television signal in terms of the variance .sigma..sup.2 of the gray level and quantizing the orthogonal transform coefficients by use

Problems solved by technology

Thus, the prior art system has a first drawback that the picture quality of the block having a fine patter is degraded, namely, what is called a "block distortion", which is a phenomenon that the block loses the fineness of the pattern thereof and comes to have a flat pattern, occurs due to the quantization of a prediction error generated from the block having a fine pattern and is visually perceived as degradation in picture quality.
Thus, the prior art system has another similar drawb

Method used

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Example

First, a first embodiment of the present invention will be described hereinbelow with reference to FIG. 3.

In this figure, reference numeral 101 designates an input terminal from which television signals are inputted to the system; 103 a motion vector calculating portion for comparing a picture signal of a coding block of a current frame with a reproduced picture signal of a previous frame and calculating a motion vector; 104 a picture memory portion for storing reproduced picture signals of a current and previous frames; 107 a motion compensation portion for performing a motion compensation of the reproduced picture signals of the previous frame; 109 an intra-loop filter portion for performing two-dimensional lowpass filtering processing of a motion compensation predicting signal; 111 a prediction error evaluating portion for evaluating a prediction error by computing the difference between an original picture signal and a predictive signal of a coding block; 113 an orthogonal trans...

Example

Next, a second embodiment of the present invention will be described hereinbelow with reference to FIG. 4.

In this figure, reference numeral 201 designates an input terminal from which television signals are inputted to the system; 203 a motion vector calculating portion for comparing a picture signal of a coding block of a current frame with a reproduced picture signal of a previous frame and calculating a motion vector; 204 a picture memory portion for storing reproduced picture signals of a current and previous frames; 207 a motion compensation portion for performing a motion compensation of the reproduced picture signals of the previous frame; 209 a coding method selection portion for selecting a method of coding of a block from an interframe coding and interframe coding methods; 211 an intra-loop filter portion for performing two-dimensional lowpass filtering processing of a motion compensation signal; 213 a prediction error evaluating portion for evaluating a prediction error b...

Example

Next, a third embodiment of the present invention will be described hereinbelow with reference to FIG. 5.

In this figure, reference numeral 301 designates an input terminal from which television signals are inputted to the system; 303 a motion vector calculating portion for comparing a picture signal of a coding block of a current frame with a reproduced picture signal of a previous frame and calculating a motion vector; 304 a picture memory portion for storing reproduced picture signals of a current and previous frames; 307 a motion compensation predicting portion for performing a motion compensation predicting of the reproduced picture signals of the previous frame; 309 a coding method selection portion for selecting a method of coding of a block from an interframe coding and intraframe coding methods; 311 an intra-loop filter portion for performing two-dimensional lowpass filtering processing of a motion compensation predicting signal; 313 a prediction error evaluating portion for...

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Abstract

A motion compensated prediction interframe coding system which first measures characteristics regarding the fineness of a pattern or texture of a picture, which is represented by an input television signal and is divided into a group of continuous blocks each quantized by using a quantization step size, and changes the quantization step size into a smaller one if quantizes a block having a picture pattern or texture finer than patterns of the other blocks. Thereby, an amount of generated codes can be limited but a motion compensated prediction frame coding operation can be performed without degrading the fineness of the texture of the original input picture.

Description

BACKGROUND OF THE INVENTION1. Field of the InventionThis invention generally relates to a television system and more particularly to a motion compensated prediction interframe system for performing motion compensated prediction interframe coding of television signals.2. Description of the Related ArtRecently, with advance in techniques of moving picture coding, a motion compensated prediction interframe coding system has been developed as an efficient coding system for effecting an efficient coding of a color moving picture for use in a visual telephone (or video telephone), a video conference system, CD ROM, a digital video tape recorder (VTR) and so on. An example of a motion compensated prediction interframe coding system is described in T. Fukinuki: Multidimensional Signal Processing of TV Picture, Nikkan Kogyo Shinbun Company, Chapter 7 "Efficient Coding", pp. 213-291 (1988. 11. 15).When a large quantity of prediction error signals is generated, the motion compensated predictio...

Claims

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Application Information

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IPC IPC(8): G06T9/00H04N7/50H04N7/26H04N7/30
CPCH04N19/82H04N19/107H04N19/126H04N19/14H04N19/146H04N19/15H04N19/159H04N19/176H04N19/60H04N19/61
Inventor TANAKA, AKIYOSHIMATSUYA, SATOSHIFUJIKAWA, WATARUUWABO, HIROYUKIINOUE, IKUONAGATA, ATSUSHI
Owner PANASONIC CORP
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