Accession Number:

ADA458740

Title:

A New MERIT Version for MPEG-2 Encoded Files

Descriptive Note:

Technical rept.

Corporate Author:

MARYLAND UNIV COLLEGE PARK CENTER FOR AUTOMATION RESEARCH

Personal Author(s):

Report Date:

2000-09-01

Pagination or Media Count:

42.0

Abstract:

The MPEG Encoded Retrieval and Indexation Toolkit MERIT performs video segmentation of MPEG files in the compressed domain, using an algorithm based on macroblock type statistics. It was written in C by V. Kobla in 1995 for his doctoral work at the University of Maryland. Koblas code dealt with MPEG-1 files only. In this report, we update MERIT to analyze MPEG-2 files as well. We modify the file parsing process to account for the MPEG-2 specifications. We account for the new motion compensation modes introduced by MPEG-2 specifications. We account for the new motion compensation modes introduced by MPEG-2 in preliminary computations, generating data structures that allow the original MERIT segmentation algorithm to work properly. A series of tests confirmed the validity of our solutions. The new version 4.0 of MERIT is a superset of MERIT 3.3, insofar as it gives the same results for MPEG-1 files, and is able to analyze MPEG-2 files using almost all the available options. Further improvements could be made to address key-frame storage and higher chrominance formats.

Subject Categories:

  • Numerical Mathematics
  • Photography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE