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:
Nov. 10, 2009
Filed:
Dec. 05, 2005
Arcangelo Ranieri Bruna, San Cataldo, IT;
Giovanni Gallo, Catania, IT;
Sebastiano Battiato, Aci Catena, IT;
Salvatore LA Rosa, Barrafranca, IT;
Arcangelo Ranieri Bruna, San Cataldo, IT;
Giovanni Gallo, Catania, IT;
Sebastiano Battiato, Aci Catena, IT;
Salvatore La Rosa, Barrafranca, IT;
STMicroelectronics S.R.L., Agrate Brianza, IT;
Abstract
A method for compression includes applying a discrete cosine transform to said image data to obtain transform coefficients, quantizing the transform coefficients by applying a quantization level scaled through a gain value, adjusting the gain value as a function of desired image parameters by executing a first time said quantization operation applying a first gain value and obtaining first quantized data, estimating statistically a second gain value suitable to obtain the desired image parameters, and executing a second time said quantization operation applying said second gain value. The operation of statistical estimation of the second gain value includes evaluating a threshold value as a function of the desired image parameters and setting to zero a percentage of coefficients of the first quantized data as a function of the threshold value.