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:
Jul. 28, 2009
Filed:
Mar. 22, 2005
Shizhong Liu, San Diego, CA (US);
Phan L. DO, San Diego, CA (US);
William Yee-ming Huang, San Diego, CA (US);
Charles S. Han, San Diego, CA (US);
Suhail Jalil, Poway, CA (US);
Shizhong Liu, San Diego, CA (US);
Phan L. Do, San Diego, CA (US);
William Yee-Ming Huang, San Diego, CA (US);
Charles S. Han, San Diego, CA (US);
Suhail Jalil, Poway, CA (US);
Qualcomm Incorporated, San Diego, CA (US);
Abstract
A dynamically scaled file encoding method and apparatus are disclosed. A file encoding system using JPEG encoding can be configured to produce relatively constant compressed file sizes irrespective of the initial file size and file contents. The system retrieves an initial file or image that is to be compressed and determines a target bit rate corresponding to the compressed file. The target bit rate is used to determine an initial scaling factor. The initial file is encoded using a JPEG encoder having coefficients scaled by the initial scaling factor. The resultant bit rate can be adjusted in a second loop if greater than the desired bit rate. To adjust the bit rate, a recomputed scaling factor is determined from the resultant bit rate. The initial file is then encoded with coefficients scaled by the recomputed scaling factor to achieve a bit rate that is within the target bit rate.