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System and method for quality-aware selection of parameters in transcoding of digital images

An image and transcoding technology, applied in the field of image transcoding, can solve problems such as image scaling, image quality reduction and bit rate reduction

Inactive Publication Date: 2012-05-30
ECOLE DE TECH SUPERIEURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method does not include scaling of the image when reducing the quality and bitrate of the image

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  • System and method for quality-aware selection of parameters in transcoding of digital images

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Embodiment Construction

[0122] It is an object of embodiments of the present invention to provide a method and quality-aware image transcoder for scaling images to meet display device constraints regarding resolution or image size and file size, while at the same time enabling the user experience, or transcoded The objective quality of the code image is maximized.

[0123] In a first embodiment, a transcoder system using a prediction table (Table 1 below) based on the results of transcoding a large number of images is described. Further details on prediction tables and the methods by which they can be generated can be found in the aforementioned paper by Steven Pigeon and Stéphane Coulombe (titled "Computationally efficient algorithms for predicting the file size of JPEG images subject to changes of quality factor and scaling").

[0124] The prediction table can be used as a three-dimensional lookup table for estimating the file size of the transcoded image with a certain amount of statistical confid...

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Abstract

Several quality-aware transcoding systems and methods are described, in which the impact of both quality factor (QF) and scaling parameter choices on the quality of transcoded images are considered in combination. A basic transcoding system is enhanced by the addition of a quality prediction look-up table, and a method of generating such a table is also shown.

Description

[0001] related application [0002] This application claims the benefit of: U.S. Provisional Application Serial No. 60 / 991,956 by Stéphane Coulombe et al., filed December 3, 2007, and entitled "Quality-Aware Selection of Quality Factor and Scaling Parameters in JPEG Image Transcoding ”; U.S. Patent Application Serial No. 12 / 164,836, filed June 30, 2008, by Stéphane Coulombe et al., entitled “Method and System for Quality-Aware Selection of Parameters in Transcoding of Digital Images”; and Steven Pigeon’s PCT patent application titled "System and Method for Predicting the File Size of Images Subject to Transformation by Scaling and Change of Quality-Controlling Parameters", serial number PCT / CA2007 / 001974, application date is November 2, 2007. technical field [0003] The present invention relates generally to image transcoding, and in particular to the transcoding of images contained in Multimedia Messaging Service (MMS) messages. Background technique [0004] As for exampl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T9/00G06T3/40G06T7/00H04N7/50H04N7/24H04L12/58H04W4/12
CPCH04N19/00187H04N19/00181H04N19/00357H04N19/00266H04N19/00472H04N19/00775H04N19/00175H04N19/00757H04N19/00139H04N19/0009H04N19/00369H04N19/147H04N19/172H04N19/196H04N19/149H04N19/15H04N19/60H04N19/124H04N19/136H04N19/192H04N19/40H04N19/59H04N19/48G06T3/4092
Inventor S·库隆布S·皮金J-F·弗朗什
Owner ECOLE DE TECH SUPERIEURE