KR970019631A

KR970019631A - MPEG II coder

Info

Publication number: KR970019631A
Application number: KR1019950029677A
Authority: KR
Inventors: 최종식
Original assignee: 구자홍; 엘지전자 주식회사
Priority date: 1995-09-12
Filing date: 1995-09-12
Publication date: 1997-04-30
Also published as: KR0172902B1

Abstract

본 발명은 MPEGⅡ 부호기에 관한 것으로, 특히 패이드 인(fade in)또는 패이드 아웃트(fade out)처리시에서 늘어나는 데이터량을 압축시키도록 한 MPEGⅡ 부호기에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an MPEG II encoder, and more particularly to an MPEG II encoder for compressing an increased amount of data during a fade in or fade out process.

상기와 같은 목적은 달성하기 위해서 본 발명의 MPEGⅡ 부호기는 영상을 주파수 성분으로 변화시켜 주는 변환 수단과, 상기 변환수단의 주파수 성분을 유한한 개수의 값으로 디지털화시키는 양자화수단과, 상기 양자화수단의 출력을 가변길이 부호 또는 고정길이부호로 부호화시키는 코딩수단과, 상기 코딩수단의 출력을 일시 저장하면서 출력하는 버퍼수단과, 상기 버퍼수단에 저장되는비트스트림의 량의 많고 적음에 따라 상기 양자화수단의 스케일 값을 제어하는 양자화제어수단과, 상기 양자화 수단의 출력을 주파수 성분으로 복호화하는 역양자화수단과, 상기 역양자화수단의 출력을 영상으로 복호화하는 역변환수단과, 상기 역변환수단의 출력과 움직임 보상된 영상 또는 보상되지 않은 영상을 합성하여 영상신호를 복원하는 복원수단과, 상기 역변환수단의 출력과 움직임 보상된 영상 또는 보상되지 않은 영상을 합성하여 영상신호를 복원하는 복원수단과, 상기 복원수단의 영상 출력이 Ⅰ영상 P영상부호화 타입일때만 전송하는 제1스위칭수단과, 상기 제1스위칭 수단에서 전송되는 출력을 저장하는 메모리수단과, 이후 입력되는 프레임 영상화소들의 구획을 상기 메로리수단에 저장된 이전 프레임과 비교 추정하여 움직임을 추정하는 움직임 추정수단과, 상기 메모리수단에 저장된 이전 프레임영상을 상기 움직임 추정수단의 움직임량만큼 보상하는 움직임 보상 수단과, 상기 움직임 보상수단에서 보상된 영상에 의해 입력되는 프레임 영상을 프레임내의 부호화 또는 프레임간의 부호화로 선택 결정하는 인터 및 인트라 결정수단과, 상기 인터 및 인트라 결정수단의 결정에 따라 스위칭절환하여 상기 움직임 보상수단의 보상영상을 출력하는 제2스위칭수단과, 이후 입력되는 프레임영상과 상기 제2스위칭수단의 스위칭에 의한 움직임보상영상을 감산하여 차영상을 출력하는 동영상 제거수단과, 상기 후입력되는 프레임영상과 상기 제2스위칭에 의한 움직임보상영상을 감산하여 차영상을 출력하는 동영상 제거수단과, 상기 후입력되는 프레임영상과 상기 제2스위칭에 의해 움직임 보상영상간의 DC레벨차이를 검출하여 패이드 인(fade in) 및 패이드 아웃트(fade out)분석에 따라 후입력되는 프레임영상의 부호화량을 감축하는 패이드 인 및 패이드 아웃트 처리수단을 포함하여 이루어짐을 특징으로 한다.In order to achieve the above object, the MPEG II coder of the present invention provides a conversion means for converting an image into frequency components, quantization means for digitizing the frequency components of the conversion means into a finite number of values, and an output of the quantization means. Coding means for encoding a variable length code or a fixed length code, a buffer means for temporarily outputting the output of the coding means, and a scale of the quantization means as the amount of the bit stream stored in the buffer means is small and large. A quantization control means for controlling a value, an inverse quantization means for decoding the output of the quantization means into frequency components, an inverse transform means for decoding the output of the inverse quantization means into an image, an output and motion compensated image of the inverse transform means Restoring means for restoring an image signal by synthesizing an uncompensated image; Restoring means for combining the output of the converting means with a motion compensated image or an uncompensated image for restoring an image signal, first switching means for transmitting only when the image output of the restoring means is an I-image P-video encoding type; Memory means for storing the output transmitted from the first switching means, motion estimation means for estimating motion by comparing and estimating a section of frame image pixels input thereafter with a previous frame stored in the memory means, and transfer stored in the memory means Motion compensating means for compensating a frame image by the motion amount of the motion estimating means, inter and intra determining means for selecting and determining a frame image input by the image compensated by the motion compensating means by coding in a frame or coding between frames; Switching switching according to the determination of the inter and intra determination means. A second switching means for outputting a compensation image of the motion compensating means, a video removal means for outputting a difference image by subtracting a frame image input thereafter and a motion compensation image by switching of the second switching means, and the post-input Video removal means for subtracting the frame image and the motion compensation image by the second switching and outputting the difference image, and detecting the DC level difference between the frame image input after the second switching and the motion compensation image by the second switching. And a fade in and a fade out processing means for reducing the amount of encoding of a frame image which is subsequently input according to fade in and fade out analysis.

Description

MPEG (MPEG) II Encoder

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제 2도는 본 발명의 엠펙Ⅱ부호기에 대한 제1실시 구성블럭도2 is a block diagram of the first embodiment of the MPEG-2 encoder of the present invention.

제 3도는 본 발명의 엠펙Ⅱ부호기에 대한 제2실시 구성블럭도3 is a block diagram of the second embodiment of the MPEG-2 encoder of the present invention.

Claims

Conversion means for converting the image into frequency components, quantization means for digitizing the frequency components of the conversion means into a finite number of values, todding means for encoding the output of the quantization means with a variable length code or a fixed length code; Buffer means for temporarily outputting the output of the coding means, quantization control means for controlling the scale value of the quantization means as the amount of the bitstream stored in the buffer means is large and small, and the output of the quantization means. Inverse quantization means for decoding into frequency components, inverse transform means for decoding the output of the inverse quantization means, and reconstruction means for combining the output of the inverse transform means and a motion compensated or uncompensated image to restore an image signal And only when the video output of the restoring means is the I video P video encoding type. A first switching means, memory means for storing an output transmitted from the first switching means, motion estimation means for estimating motion by comparing and estimating a section of frame image pixels input thereafter with a previous frame stored in the memory means; A motion compensating means for compensating a previous frame image stored in the memory means by the motion amount of the motion estimating means, and selecting and determining a frame image input by the image compensated by the motion compensating means by encoding in a frame or encoding between frames. Second switching means for outputting a compensation image of the motion compensation means by switching switching according to the determination of the inter and intra determination means, and then switching the input frame image and the second switching means. Video outputting difference image by subtracting motion compensation image A DC level difference between the removal means and the motion compensation image by the second input frame image and the second input frame, and the frame input after the input according to the fade in and fade out analysis. MPEG-2 encoder, characterized in that it comprises a fade in and a fade out processing means for reducing the amount of encoding of the video.

2. The difference level detecting means according to claim 1, wherein the fade in and fade out processing means detects a difference between the DC level by the DC level of the compensated image passed through the second switching means and the DC level of the frame image to be input later. And a DC level compensating means for compensating for the DC level insufficient by the difference between the DC level of the difference level detecting means and the compensation image passed through the second switching means, the DC compensated image of the DC level compensating means and the post-input. The fade in and fade out detection means for outputting a finite number of selection signals according to the difference between the frame images and the threshold, which is an experimental value, and the difference between the DC level difference of the difference level detection means and the video removal means A first selection means selected and output by a selection signal of the id in and fade out detection means, and a difference image between the output of the selection means and the video removal means is selected by a selection signal of the encoding type; MPEGⅡ encoder according to the yirueojim, including second selection means output characteristics.

2. The apparatus of claim 1, wherein the fade in and fade out processing means are added to be shared between the converting means and the quantization means and between the second switching means and the video removing means, and the compensation image and the post-input through the second switching means. Difference level detection means for detecting the difference of the DC level by the DC level of the frame image to be framed, and DC level at which the difference level detection means is compensated by the DC level insufficient by the compensation image through the DC level difference and the second switching means. Fade in and fade outputting a plurality of finite number selection signals according to a compensation means, a difference between the DC compensated image of the DC level compensating means and the post-input frame image, and threshold values of inter and intra determination means. Out limit detection means, DC compensated image of the DC level compensation means and the rough compensation image of the second switching means is a finite number of selection of the fade in and fade out detection means First selecting means selectively outputted to the moving picture removing means by a second level; restoring the frequency component of the difference image generated from the moving picture removing means and the converting means by a DC level difference of the difference level detecting means; A second component in which the output of the DC level restoring means and the frequency component of the difference image generated from the video removing means and the converting means are selected by the finite number selection signal of the fade in and fade out monitoring means by the quantization means; An MPEG II encoder comprising a selection means.

※ Note: The disclosure is based on the initial application.