Device for recording and/or reproducing digital data and control method thereof

Abstract

A digital data recording and / or reproducing apparatus and a control method thereof, In particular, the digital data recording and / or reproducing apparatus and method are capable of recording and reproducing an incoming digital broadcasting program in compressed format. The digital data recording and / or reproducing apparatus includes a controller for counting the number of forward motion compensation interpolated macro blocks and backward motion compensation interpolated macro blocks of a bidirectionally-predictive coded picture of a group of picture of the digital data, and detecting a point where a scene change occurs based on the counted number, and a video index generator for generating a video index by decoding an intraframe coded picture nearest to the detected point of scene change of each GOP, reproducing images and arranging the reproduced images. The navigation function is provided without requiring all the frames of the compressed broadcasting program to be decoded, but by detecting scene changes in the compressed region of the broadcasting program, and generates a video index of images of detected scene change points.

Description

technical field [0001] The present invention relates to an apparatus for recording and / or reproducing data such as digital audio / video (A / V) data, and a control method, and more particularly, the present invention relates to an apparatus for recording and / or An apparatus for reproducing data such as digital A / V data, and a control method, wherein the apparatus detects a scene change point (scene change point) in order to search data received and stored therein, and uses the detected scene Change points to generate navigation data. Background technique [0002] Generally, the "navigation" function of a data recording and / or reproducing apparatus such as an A / V data recording and / or reproducing apparatus refers to moving from a current data reproduction point to another point selected by the user, and from Reproduction is resumed at a point selected by the user, or the reproduction order of the recorded A / V data is rearranged according to the user's request, so that reproduct...

AI Technical Summary

Problems solved by technology

The main disadvantage of this existing method is that the successive processes of decoding the compressed image according to the MPEG format, restoring the image, DCT calculation again, and real-time detection of scene changes require a very large amount of calculations

However, the disadvantage of this method is that it requires complex calculations for the motion vectors of each frame

Although for this method phase matching can be used, however, this requires a lot of computation and memory to perform the Fast Fourier Transform (FFT)

[0008] As described above, such complex calculations required for scene change detection hinder the application of the above method in systems with relatively low capacity such as satellite broadcast receivers, etc.

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