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:
Apr. 07, 2015
Filed:
Sep. 04, 2012
Vijay G. Prabakaran, San Jose, CA (US);
Vijay G. Prabakaran, San Jose, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
During downscaling of an image, a scaler may generate a specified number 'M' output lines of an output frame for each specified number 'N' input lines of an input frame, and store the output lines in a buffer. The scaler may keep the output horizontal line durations consistent throughout the active line period, with a horizontal line duration ratio of M/N between input and output frame streams. ‘M’ threshold values may be stored in a lookup table, and for each output line the relative position of the output line within the output frame may be used to look up a corresponding threshold value in the lookup table, and the timing generator may wait until the buffer occupancy reaches the corresponding threshold value before outputting the output line from the buffer. To guarantee even line widths, the threshold values may be assigned values that depend on the scaling ratio used.