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. 23, 2012
Filed:
Feb. 25, 2008
Roger Kumar, San Francisco, CA (US);
Maynard Handley, Cupertino, CA (US);
Thomas Pun, Sunnyvale, CA (US);
Xiaochun Nie, Cupertino, CA (US);
Hsi-jung Wu, Sunnyvale, CA (US);
Roger Kumar, San Francisco, CA (US);
Maynard Handley, Cupertino, CA (US);
Thomas Pun, Sunnyvale, CA (US);
Xiaochun Nie, Cupertino, CA (US);
Hsi-Jung Wu, Sunnyvale, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
Some embodiments of the invention provide a method of performing a Discrete Cosine Transform ('DCT') encoding or decoding coefficients of a data array by (1) multiplying the coefficients by a scalar value before the encoding or decoding, and then (2) dividing the encoded or decoded coefficients by the scalar value. When used in conjunction with fixed-point arithmetic, this method increases the precision of the encoded and decoded results. In addition, some embodiments provide a method of performing a two-dimensional (2D) Inverse Discrete Cosine Transform ('iDCT'). This method splits a pre-multiplication operation of the iDCT into two or more separate stages. When used in conjunction with fixed-point arithmetic, this splitting increases the precision of the decoded results of the iDCT.