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:
Oct. 14, 2014
Filed:
May. 18, 2012
Haifeng LI, Beijing, CN;
Bin Yang, Beijing, CN;
Haifeng Li, Beijing, CN;
Bin Yang, Beijing, CN;
Peking University Founder Group Co., Ltd., Beijing, CN;
Peking University, Beijing, CN;
Beijing Founder Electronics Co., Ltd, Beijing, CN;
Peking University Founder R & D Center, Beijing, CN;
Abstract
The present application discloses a method and an apparatus for generating multi-bit depth halftone amplitude-modulation dots. The method may comprise: scanning an input image to obtain a value of a current pixel P, where x represents a lateral position index of the current pixel, and y represents a vertical position index of the current pixel; obtaining gfrom a preset multi-bit depth threshold matrix G by starting with i=0, and determining if P<g, then providing a screening output gray level gradation value of the printer to Out=L−1−i; and otherwise, increasing i and repeating the determining and providing steps. L represents the number of a frequency-modulation screen gradation, L=2, e represents a bit depth value of the printer, i is an integer and i∈[0,L−1], h is an index number of an element g arranged sequentially in G and h is provided to h=(y % n)×m+(x % m)+i×m×n, and gis the element value of iline and jrow in G. The method and apparatus according to the present application can improve the speed for generating the multi-bit depth halftone amplitude-modulation dots.