The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 03, 2003
Filed:
Nov. 17, 1999
Yoshihiro Miyamoto, Tokyo, JP;
NEC Corporation, , JP;
Abstract
Distance from a small block to a synchronizing pattern inserted into coded data is calculated for each small block in an image frame. On the basis of the count, a data-loss probability estimation unit estimates the probability that coded data of a target small block will be lost during transmission. In regard to a small block in which interframe predictive coding has been performed, an image-quality degradation estimation unit estimates the degree of image-quality degradation that will be caused in this small block in the decoded image. The forced refresh priority of each small block is calculated upon comparing the estimated data-loss probability and estimated degree of image-quality degradation with threshold values, and the values of priority are recorded in the form of a forced refresh map. When the next frame is coded, reference is had to the recorded values of priority and a small block in which intraframe coding will be forcibly performed is selected based upon the recorded values of priority. When some coded data is lost owing to the occurrence of an error, therefore, a decline in the quality of the decoded image can be suppressed in an effective manner.