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:
Oct. 19, 2004
Filed:
Oct. 25, 2002
Reji Mathew, Riverwood, AU;
Jian Zhang, Enfield, AU;
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method ( ) and decoder system ( ) for reducing quantization effects or ringing artifacts imposed upon decoded image of hybrid block based coding schemes such as MEPG and H 261. The system ( ), in use, and method ( ) receive ( ) decoded image decoded blocks that were decoded from transform coded blocks quatized by a selected quantization parameter. The system ( ) and method ( ) then analyze ( ) selected pixel values of selected pixels with neighboring pixel values of associated neighboring pixels in the decoded blocks to determine difference values for each of the selected pixels. Potential object edges, of the decoded image represented by the decoded blocks, are then detected ( ) to identify the selected pixels as edge pixels, the detecting is effected by comparing the difference values with selected threshold values that are determined with respect to the selected quantization parameter associated with the blocks. The selected threshold values have a non-linear relationship with varying quantization parameter values of the image. The selected pixel values are modified ( ) if they are not identified as edge pixels.