KR970073143A - IMPROVED IMAGE CODING SYSTEM HAVING FUNCTIONS FOR CONTROLLING GENERATED AMOUNT OF CODED BIT STREEM - Google Patents

Abstract

According to the present invention, the complexity of an image to be encoded is calculated based on motion compensation error value information generated every frame through motion estimation and compensation of an object, and the complexity of an image to be encoded is calculated based on the calculation result. The present invention relates to a motion estimation method and a motion estimation method using a current frame and a reconstructed previous frame, and more particularly, to an image encoding system having a bit generation amount adjustment function capable of adaptively adjusting a bit generation amount after coding by selectively removing a high- A motion compensation error value is calculated by adding each pixel value for each macroblock to an error signal between prediction frames obtained through compensation, and a motion compensation error value of each calculated macroblock is averaged to calculate a motion compensation error value The motion average error value is calculated. A directing error calculation means; An average error value of a plurality of calculated frames is referred to as a complexity of a frame to be currently encoded through an encoding means and a plurality of predetermined filter coefficient determination signals for limiting a frequency passband width of a current frame inputted for encoding Control means for generating a bandwidth determination signal corresponding to the calculated average error value; And a current frame signal for current frame motion estimation compensation that is input based on the generated filter coefficient determination signal. The present frame signal is provided to the encoding means without filtering or is input based on filter coefficients determined in accordance with a filter coefficient determination signal generated in a plurality of filter coefficients And two-dimensional low-pass filtering means for applying a two-dimensional low-pass filtering to the current frame signal and limiting the passband thereof to provide a frame signal from which a high-frequency component has been removed to a coding means as a current frame signal for motion estimation and compensation It is possible to effectively control the amount of bits generated after encoding without increasing the step size excessively at the time of quantization in the encoding means.

Description

IMPROVED IMAGE CODING SYSTEM HAVING FUNCTIONS FOR CONTROLLING GENERATED AMOUNT OF CODED BIT STREEM

Since this is a trivial issue, I did not include the contents of the text.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an image encoding system having a bit generation amount adjustment function according to a preferred embodiment of the present invention; FIG. FIG. 2 is an example of an 8 × 8 pixel block as an example according to the present invention, FIG. 3 is an example of a 3 × 3-order 2-dimensional low-pass filter coefficient as an example according to the present invention

Claims (5)

And an error signal between predictive frames obtained through motion estimation and compensation of a current macroblock unit using the present frame and a reconstructed previous frame, through encoding means including discrete cosine transform, quantization, and entropy encoding, Wherein the quantization step comprises the step of adjusting the step size of the bit stream based on the full state information of the bit stream stored in the output side buffer, For calculating a motion compensation error value for each of the plurality of frames by averaging the calculated motion compensation error values of the calculated respective macroblocks, Calculation means; Wherein the average error value of the calculated plurality of frames is referred to as a complexity of a current frame to be encoded through the encoding means and a predetermined plurality of filter coefficient determinations for limiting the frequency notification bandwidth of the current frame inputted for encoding Control means for generating a filter coefficient determination signal corresponding to the calculated average error value among the signals; And providing the current frame as the current frame signal for the motion estimation compensation to the encoding means without filtering based on the generated filter coefficient determination signal or in accordance with the generated filter coefficient determination signal among the plurality of filter coefficients Dimensional low-pass filtering is selectively applied to the input current frame signal based on the determined filter coefficient to restrict a passband thereof, thereby removing a high-frequency component from the frame signal as a current frame signal for motion estimation and compensation, Dimensional low-pass filtering means for generating a low-pass filtered image signal. 2. The apparatus of claim 1, wherein each of the existing filter coefficient determination signals includes an average error value of each of the calculated frames, an average error value of a plurality of transmitted frames per second obtained by averaging the average error value of each frame, Wherein the bit error rate is determined using standard deviation. The method of claim 1 or 2, wherein the predetermined filter coefficient determination signal includes four filter coefficient determination signals having different integer values for selective bandwidth limitation of each block of the current frame signal And a bit-amount adjustment function. 4. The image encoding system according to claim 3, wherein each of the filter coefficients has a degree of 3x3. 2. The image encoding system of claim 1, wherein the two-dimensional low-pass filtering for the current frame is performed in 8x8 block units. ※ Note: It is disclosed by the contents of the first application.