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:
Mar. 12, 2013
Filed:
Apr. 21, 2009
Quan Huynh-thu, Ipswich, GB;
Benjamin Pernot, Ipswich, GB;
Quan Huynh-Thu, Ipswich, GB;
Benjamin Pernot, Ipswich, GB;
Psytechnics Limited, Ipswich, GB;
Abstract
The present invention relates to an apparatus and method for processing images, in particular for determining the degree of blockiness in coded images. The invention comprises apparatus and methods for determining a degree of blockiness by performing the steps of: for each of a plurality of pixels determining a vertical gradient measure in dependence upon the values of said pixel and neighbouring pixels; comparing said vertical gradient measure with a vertical gradient threshold and defining said pixel as a potential horizontal boundary in dependence thereon determining a horizontal gradient measure in dependence upon the values of said pixel and neighbouring pixels; comparing said horizontal gradient measure with a horizontal gradient threshold and defining said pixel as a potential vertical boundary in dependence thereon; and determining said blocking artefact measure in dependence upon the vertical gradient measure of pixels defined as a potential horizontal boundary and upon the horizontal gradient measure of pixels defined as a potential vertical boundary. Method and apparatus for generating a quality measure in dependence upon the measure of blockiness are also provided.