JP2013021626A5 - - Google Patents

Description

The present invention provides a document reading unit that reads a reflected light image of a document illuminated by an illumination light source and inputs document image data, and a background skip amount for the document image data input from the document reading unit. The image processing apparatus includes an image processing unit that performs at least a background removal process for converting a density value equal to or less than a density value to 0.
Light source light quantity control means for adjusting the light quantity of the illumination light source according to the transmittance of the original or the paper thickness;
When the document is of a document type including a pattern having highlight information, when the light amount of the illumination light source is adjusted to a value different from the default value by the light source light amount control means, There is provided a background skip amount control means for adjusting to a value smaller than the default value of the background skip amount according to the transmittance or paper thickness of the original, which is different from the default value .

According to the image processing apparatus of the present invention, by adjusting the amount of light of the illumination light source according to the transmittance of the document or the paper thickness, it is possible to reliably remove the show-through characters such as the characters on the document. On the other hand, when the document to be read is a document type including a pattern having highlight information, when the light amount of the illumination light source is adjusted to a value different from the default value, the background skip amount is different from the default value. By adjusting to a value smaller than the default value of the background skip amount according to the transmittance or paper thickness of the document, omission of highlight information on the document is suppressed, and the gradation property of the highlight portion of the pattern is improved. Can keep.

Claims (6)

A document reading means for reading a reflected light image of a document illuminated by an illumination light source and inputting document image data;
An image processing apparatus comprising: image processing means for performing at least a background skip processing for converting a density value equal to or less than a value set as a background skip amount to document image data input from the document reading means. ,
Light source light quantity control means for adjusting the light quantity of the illumination light source according to the transmittance of the original or the paper thickness;
When the document is of a document type including a pattern having highlight information, when the light amount of the light source for illumination is adjusted to a value different from the default value by the light source light amount control means, the background skip amount is set. An image processing apparatus comprising: a background skip amount control unit that adjusts to a value smaller than the default value of the background skip amount according to the transmittance or paper thickness of the document, which is different from the default value . Document type determination means for determining whether or not the document is of a document type including a pattern having highlight information based on the document image data;
2. The image processing apparatus according to claim 1, wherein the document type determination result by the document type determination unit is notified to the background skip amount control unit. Means for the user to specify whether or not the document is of a document type including a pattern having highlight information;
The image processing apparatus according to claim 1, wherein the user specifies a document type designation to the background skip amount control unit. A detection means for detecting a transmittance or a paper thickness of the original in the original reading means;
The image processing apparatus according to claim 1, 2 or 3, wherein the transmittance or paper thickness of the document detected by the detection means is notified to the light source light quantity control means and the background skip amount control means. . 4. The image processing according to claim 1, further comprising means for a user to specify a transmittance or a paper thickness of the document for the light source light amount control unit and the background skip amount control unit. apparatus. A document reading unit that reads a reflected light image of a document illuminated by an illuminating light source and inputs document image data, and the document image data input from the document reading unit is less than or equal to a value set as a background skip amount. An image processing apparatus control method comprising: image processing means for performing at least a background removal process for converting a density value to 0,
A light source light amount control step of adjusting the light amount of the illumination light source according to the transmittance of the original or the paper thickness;
When the document is of a document type including a pattern having highlight information, when the light amount of the illumination light source is adjusted to a value different from the default value by the light source light amount control step, the background skip amount And a background skip amount control step of adjusting the background skip amount to a value smaller than the default value according to the transmittance or paper thickness of the document, which is different from the default value. Control method of the device.