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:
Jun. 20, 2000
Filed:
Dec. 18, 1997
Vadlamannati Venkateswar, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A method of dynamically quantizing pixel data for use by a digital printer system that prints the pixel data with modulated pixel values. The data is first modulated, with the output pixel values being determined by an image screen. (FIGS. 1 and 2). Then, the data is quantized, using different quantization tables for different pixel values of the same image. The parameters that determine which quantization table is used for a particular pixel value include the pixel's position with respect to the screen or the pixel's image content. (FIGS. 3 and 5) In the case of data that is also being compressed with differential pulse code modulation, the quantization can be based on a buffer fullness measure (FIG. 6).