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Image processing apparatus, image processing method and information processing apparatus, and information processing method

A technology of image processing equipment and information processing equipment, applied in image communication, digital video signal modification, pulse modulation TV signal transmission, etc., can solve the problems of image data image quality degradation, large data size, etc., to reduce the degree of degradation, Effect of reducing data size

Active Publication Date: 2008-01-23
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] When achromatic copy-forgery-inhibited pattern image data is input to a printer that JPEG-compresses RGB image data in the RGB color space, the following problem occurs: The data size after JPEG compression is still large
However, the use of quantization tables with high compression ratios significantly degrades the image quality of image data

Method used

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  • Image processing apparatus, image processing method and information processing apparatus, and information processing method
  • Image processing apparatus, image processing method and information processing apparatus, and information processing method
  • Image processing apparatus, image processing method and information processing apparatus, and information processing method

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no. 1 example

[0076] How the invention works

[0077] The principle of the present invention is explained with reference to FIGS. 1 and 2 .

[0078] Reference numeral C2001 in FIG. 2 denotes small dots in the cyan copy-forgery-inhibited pattern image data (in the background area). A pixel filled with white represents a brightness value of 255, and a pixel filled with black represents a brightness value of 0. Since a pixel filled with white on all R, G, and B planes has a brightness value of 255 for all R, G, and B, it is a white pixel.

[0079] On the other hand, since a pixel filled with black only on the R plane and white on the G and B planes has (R, G, B)=(0, 255, 255), it is a cyan pixel.

[0080] Anti-Copy Forgery Map of Cyan After Converting from RGB Space to YCbCr Space JPEG compression of case image data

[0081] Transforming the small dot C2001 in the cyan copy-forgery-inhibited pattern image data into the YCbCr color space produces C2003. A pixel that is cyan in C2001 h...

no. 2 example

[0180] Now, the second embodiment of the present invention will be described mainly focusing on the differences from the first embodiment. FIG. 12 shows a block diagram of a computer 1001-2 that can integrate print data items through the spooler 204. As shown in FIG. When the application 201 causes the printer 1003 to print, the graphics engine 202 is used for output (rendering).

[0181] The graphics engine 202 converts the GDI (Graphic Device Interface, Graphic Device Interface) function received from the application program 201 into a DDI (Device Driver Interface, Device Driver Interface) function. The graphics engine 202 outputs the DDI function to the printer driver 203 .

[0182] Based on the DDI function received from the graphics engine 202, the printer driver 203 converts the data into image data (print data) described in a page description language. The print data has image data attribute information as header information. The image data attribute information incl...

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Abstract

According to the claimed invention, an image processing apparatus is provided, wherein the image processing apparatus comprises a color determiner, adapted to determine a color of image data; a color space determiner, adapted to determine a color space for compressing the image data based on the color determined by the color determiner; and a converter, adapted to convert the image data into data on a plurality of planes that constitute the color space determined by the color space determiner and compressing the data on each plane, wherein the color space determiner determines the color space based on the color determined by the color determiner so that AC components of the image data concentrate on a certain plane of the plurality of planes.

Description

technical field [0001] The present invention relates to an image processing device, an image processing method, and an information processing device and an information processing method. In particular, the present invention relates to an image processing device having an image data encoding function, an image processing method, and an information processing device and an information processing method. Background technique [0002] Japanese Patent Application Laid-Open No. 2001-197297 discloses a technique by which a computer transmits manuscript data and copy-forgery-inhibited pattern image data to a printer, and the printer synthesizes the two received image data items, and the resulting synthesized image The data (original data with a background pattern) is output onto plain paper to create an original. The copy-forgery-prevented pattern image has a character string or the like embedded therein. Therefore, the embedded character string appears on a copy obtained by copyi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/56H04N1/41G03G21/00
CPCH04N7/26345H04N7/26292H04N19/00315H04N7/30H04N19/00775H04N19/60H04N19/186
Inventor 荒川纯也
Owner CANON KK
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