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:
Jan. 31, 2006
Filed:
Jul. 13, 2000
Tomoyuki Miyashita, Kodaira, JP;
Takeshi Makita, Kawasaki, JP;
Junichi Hayashi, Kawasaki, JP;
Tomochika Murakami, Kawasaki, JP;
Tomoyuki Miyashita, Kodaira, JP;
Takeshi Makita, Kawasaki, JP;
Junichi Hayashi, Kawasaki, JP;
Tomochika Murakami, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
This invention reduces degradation in image quality and improves altered portion specifying accuracy in a digital watermark technology. For this purpose, an apparatus of this invention inputs image data and information such as a copyright holder name to be embedded in the image data (S, S). A mask pattern having a blue noise characteristic for intermediate- and high-frequency components is set at the image data start position, and pixel data at a target embedding position in the mask pattern is quantized (S). The quantization error at this time corresponds to the bit information to be embedded at that position. This processing is repeatedly performed for the entire image (S-S).