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. 06, 2006
Filed:
Dec. 28, 2001
Peter William Mitchell Ilbery, Dundas, AU;
Peter William Mitchell Ilbery, Dundas, AU;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An apparatus () for halftoning an image is disclosed. The apparatus comprises means for determining an output value of a current pixel on a current scanline using a sum of an input value () for the current pixel and a neighborhood error value () at the current pixel, means () for determining an error at the current pixel as the difference between (i) the sum of the input value () for the current pixel and the neighborhood error value () at the current pixel, and (ii) the output value () of the current pixel; and means () for adding a proportion of the error at the current pixel to neighborhood error values at as yet unprocessed pixels of a subsequent scanline in accordance with a next scanline error impulse response; wherein said next scanline error impulse response approximates a function which spreads with self-convolution in proportion to a degree of self-convolution.