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Original manuscript reading apparatus and method

A document reading and document technology, applied in the direction of image communication, electrical components, etc., can solve problems such as color

Inactive Publication Date: 2012-08-01
MURATA MASCH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, there is a problem that an achromatic image is converted into a chromatic image because the achromatic axis deviates before and after transformation based on the obtained matrix coefficients.

Method used

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  • Original manuscript reading apparatus and method
  • Original manuscript reading apparatus and method
  • Original manuscript reading apparatus and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0051]

[0052] figure 1 It is an explanatory diagram schematically showing an example of the operation of the document reading device according to Embodiment 1 of the present invention, and shows an MFP 10 as an example of the document reading device. The MFP (Multifunction Peripheral) 10 has a scanning function, a printing function, a FAX (facsimile) function, and a copying function, and is an image processing device capable of selectively executing these functions.

[0053] The MFP 10 optically reads the document 1, processes pixel data composed of three color components of R (red), G (green), and B (blue), and generates predetermined output data. The document 1 has a color image expressing characters, symbols, graphics, etc. formed on a medium such as recording paper. A read image read from such a document 1 and composed of a large amount of pixel data is converted into a different color space, color correction is performed for controlling the color tone, and outpu...

Embodiment approach 2

[0109] In Embodiment 1, an example was described in which the color correction of image data is performed in the YCbCr color space that can be converted from the RGB color space only by matrix operations. On the other hand, in this embodiment, a case where color correction is performed in an equal color space such as the Lab color space will be described.

[0110] Figure 7 It is a block diagram showing an example of a configuration of a document reading device according to Embodiment 2 of the present invention, and shows an example of a functional configuration in MFP 10 . This MFP 10 includes an optical reading unit 11 , a LUT 12 , a gamma correction unit 13 , color space conversion units 31 , 34 , and 35 , a parameter storage unit 32 , an image correction unit 33 , a target value storage unit 36 ​​, and a correction coefficient correction unit 37 .

[0111] The color space conversion unit 31 adopts and Figure 5 The color space conversion unit 26 has the same conf...

Embodiment approach 3

[0119] In Embodiment 1, an example was described in which the color space conversion unit 14 , the image correction unit 16 , and the color space conversion unit 17 are each composed of predetermined arithmetic processing circuits. On the other hand, in this embodiment, a case will be described in which the color space conversion 14 , the image correction unit 16 , and the color space conversion unit 17 are configured by a single matrix operation circuit.

[0120] Figure 9 It is a block diagram showing an example of a configuration of a document reading device according to Embodiment 3 of the present invention, and shows an example of a functional configuration in MFP 10 . This MFP 10 includes an optical reading unit 11 , a LUT 12 , a gamma correction unit 13 , an image correction unit 51 , a color space conversion unit 52 , a parameter storage unit 15 , a target value storage unit 18 , and a correction coefficient correction unit 19 .

[0121] The image correction un...

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PUM

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Abstract

Provided is an original manuscript reading apparatus, comprising an optical reading portion used for optical reading over the original manuscript and generating an image reading data constituted by RGB components, a first color spatial alternation portion that is used for turning the RGB color space into colorless space, thus to generate the first image data from the image reading data, an image amendment portion which utilizes transformational matrix to generate amendment image data from the first image data, with the transformational matrix and the matrix coefficient times colorless components being zero in the two arithmetic expression used for obtaining new chroma components, a target value storage portion used for establishing the correspondence of the target value respectively with multiple color codes of different colors for maintenance, and a matrix coefficient confirming portion which is used for changing the matrix coefficient of the transformational matrix while comparing the color code data receiving color amendment via transformational matrix to the target value, thereby determining the matrix coefficient of the transformational matrix.

Description

[0001] This application is based on and benefits from prior Japanese Patent Application No. 2011-013599 filed on January 26, 2011, the entire contents of which are hereby incorporated by reference. technical field [0002] The present invention relates to a document reading device, and more specifically, to an improvement of a document reading device that optically reads a document to generate a read image composed of RGB components. Background technique [0003] Generally, when printing a read image read from a document by a reading device such as a scanner on recording paper or displaying it on a display, gamma correction is performed so as to allow more natural visual recognition. Gamma correction is used to correct the difference between the photoelectric conversion characteristics and output (display) characteristics of the light receiving element, and in the case of a color image, it is performed based on a LUT (look-up table) for each RGB component. [0004] Such LUT-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/46H04N1/60
Inventor 南野胜巳
Owner MURATA MASCH LTD
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