KR970068624A - APPARATUS FOR ESTIMATING MOTION OF CONTOUR IN OBJECT BASED ENCODING - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motion estimation apparatus for contour coding of an object that can effectively perform motion estimation of a contour required for contour motion compensation between frames having temporally continuous at least one object, Using the two masks, one motion for the entire contour in the first search range of a predetermined predetermined area of the previous frame through motion estimation and compensation between the current contour of the object and the previous contour of the reconstructed object Extract a first residual contour segment remaining after motion compensation; A second motion vector indicating a displacement between an extended current contour obtained by extending the current contour along a predetermined width along the boundary and a plurality of candidate contours within a second search range of a predetermined area of the previous frame is extracted , A second residual contour segment remaining after the motion compensation is extracted, a first count value is generated by counting the number of the first remaining contour segments extracted, and the number of the extracted second remaining segments is counted 2, compares the magnitude of the first count value with the magnitude of the second count value, and generates a selection control signal for selecting the first motion vector or the second motion vector in accordance with the comparison result ≪ / RTI > Generating a control signal for selecting the first motion vector or the second motion vector in accordance with the comparison result; A motion vector corresponding to a count value having a smaller size among the first and second count values of the first and second motion vectors is determined as one motion vector for the outline to be coded on the basis of the selection control signal , Motion compensation is performed using one motion vector for the outline of the object with high precision as described above, and encoding of the residual outline is performed, thereby improving the outline encoding efficiency in the object-based encoding system.

Description

APPARATUS FOR ESTIMATING MOTION OF CONTOUR IN OBJECT BASED ENCODING

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

FIG. 1 is a block diagram of a typical object-based encoding system suitable for applying a motion estimation apparatus to an outline of an object according to the present invention. FIG. 2 is a block diagram of a motion estimation apparatus for contour coding of an object according to a preferred embodiment of the present invention. FIG. 4 is a block diagram illustrating a process of detecting a motion vector using two masks according to the present invention. FIG. 4 is a block diagram illustrating a process of detecting a motion vector using two masks according to the present invention. FIG. 5 is a view showing an example of a residual contour segment obtained after motion vectors are detected and motion compensated; FIG. 5 is a view showing an extension of an object contour of a current frame to be encoded in a motion estimation according to the present invention to a predetermined range; .

Claims (7)

A motion vector for an outline is extracted through motion estimation between an input current frame and an outline of an object appearing in each of the reconstructed previous frames, and a contour approximation technique and a sampling technique are applied to the contour segments obtained through the motion estimation and compensation Based approximation error sets and the extracted motion vectors, the motion estimation apparatus comprising: a motion estimation unit for estimating motion vectors of objects in the current frame using two masks, Extracting a first motion vector for the entire contour in a first search range of a predetermined area of the previous frame through motion estimation and compensation between a current contour and a previous contour of an object in the reconstructed previous frame, The motion using the extracted first motion vector First motion estimation and compensation means for phase extraction through the remaining contour of the first segment remaining after motion compensation; An optimal candidate contour is detected through matching between an expanded current contour obtained by extending the current contour along a predetermined width along the boundary and a plurality of candidate contours within a second search range of a predetermined region of the previous frame, And extracts a second motion vector indicating a displacement between the expanded current frame and the predicted outline and performs motion compensation using motion compensation using the extracted one second motion vector Second motion estimation and compensation means for extracting a remaining remaining contour segment; A counter for counting the number of the first remaining contour segments to generate a first count value, counting the number of the extracted second remaining segments and generating a second count value; A control signal generating means for generating a selection control signal for selecting the first motion vector or the second motion vector in accordance with the result of the comparison by comparing the magnitude of the first count value and the second count value, ; And a motion vector estimator for calculating a motion vector corresponding to a count value having a smaller size among the first and second count values of the first and second motion vectors on the basis of the selection control signal, And a motion vector determination unit that determines the motion vector of the object based on the motion vector. 2. The motion estimation apparatus according to claim 1, wherein the first search range is set to a range of 占 6 pixels along the boundary of the previous outline. 3. The method according to claim 1 or 2, wherein the first motion vector is a displacement value with respect to a position determined by the number of pixels of the region to be mass-matched when the two masks are matched. Motion estimation apparatus for encoding. 2. The apparatus of claim 1, wherein the extended current contour extends by +/- 1 pixels along the contour boundary. 5. The method of claim 1 or 4, wherein the prediction contour is characterized by a number of mismatching pixels calculated through matching between a plurality of candidate contours in the search range of the previous frame and the expanded current contour Motion estimation apparatus for contour coding. The motion estimation apparatus according to claim 5, wherein the preset matching frequency is set based on a search range of the previously set previous frame. The motion estimation apparatus according to claim 1, wherein the selection control signal generated based on the first and second count values is a logic signal having a high or low level. ※ Note: It is disclosed by the contents of the first application.