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:
Sep. 18, 2012
Filed:
May. 11, 2009
Gianluca Filippini, Los Gatos, CA (US);
Hsi-jung Wu, San Jose, CA (US);
James Oliver Normile, Los Altos, CA (US);
Xiaojin Shi, Santa Cruz, CA (US);
Xiaosong Zhou, San Jose, CA (US);
Ionut Hristodorescu, San Jose, CA (US);
Gianluca Filippini, Los Gatos, CA (US);
Hsi-Jung Wu, San Jose, CA (US);
James Oliver Normile, Los Altos, CA (US);
Xiaojin Shi, Santa Cruz, CA (US);
Xiaosong Zhou, San Jose, CA (US);
Ionut Hristodorescu, San Jose, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
A method and device for dithering video from a decoder. The method and device provide: selecting a segment of video frames from the video; computing a noise map for the segment of the video, the noise map computed from differences among pixels selected from spatially-distributed sampling patterns in the segment; determining contours of quantization artifacts within the video frame based on the noise map and a histogram of pixel values in the video frame; computing a gradient measurement of pixel values along the contours; identifying regions along the contours of quantization artifacts to apply dithering based on the noise map and the gradient measurement; determining a dithering strength based on the noise map and the gradient measurement; and applying dithering noise to the identified regions at the determined dithering strength.