JP2008306396A5

JP2008306396A5 -

Info

Publication number: JP2008306396A5
Application number: JP2007150780A
Authority: JP
Filing date: 2007-06-06
Publication date: 2010-09-16
Anticipated expiration: 2027-06-06

Claims

  An image reading apparatus having a reading mode for reading an image of a document while conveying the document from the supply side to the discharge side,
  Color / monochrome determination means in the main scanning direction for determining whether a color document or a black and white document is focused on the number of pixels with saturation appearing continuously in the main scanning direction perpendicular to the document transport direction;
  It has color / monochrome determination means in the sub-scanning direction for judging whether it is a color manuscript or a black-and-white manuscript by paying attention to the number of pixels with saturation appearing continuously in the sub-scanning direction parallel to the document transport direction.
  In a reading mode for reading an image of a document during conveyance, it is determined whether the document is a color document or a monochrome document by the color / monochrome determination unit in the sub-scanning direction, not the color / monochrome determination unit in the main scanning direction. An image reading apparatus.

The color / monochrome determination means in the sub-scanning direction is
A reading line having a pixel group continuously having a number equal to or greater than the first threshold in the main scanning direction in the main scanning direction is detected as a reading line having a saturation. First reading line detection means;
An original document having the saturation-reading lines having the pixel group equal to or larger than the second threshold detected by the first scanning line detection means in the sub-scanning direction is continuously determined as a color original. And a first color / monochrome that determines a document having only a number less than the third threshold in the sub-scanning direction as the monochrome reading document having the saturation line having the pixel group equal to or greater than the second threshold. The image reading apparatus according to claim 1, further comprising a determination unit.

The image reading apparatus according to claim 2 , wherein the first threshold is 5, the second threshold is 2, and the third threshold is 60.

The image reading apparatus further includes a reading mode for reading an image of a document stationary on a platen on which the document is placed,
In a reading mode in which an image of a document stationary on the platen on which the document is placed is read, the color / monochrome determination unit in the sub-scanning direction or the color / monochrome determination unit in the main scanning direction determines whether the document is a color document Judge whether it is a manuscript,
The color / monochrome determination means in the main scanning direction is
A reading line having a pixel group continuously having a number of pixels having saturation equal to or greater than the fourth threshold in the main scanning direction is detected as a reading line having saturation. Second reading line detection means;
A document having the saturation read lines having the pixel group equal to or greater than the fifth threshold detected by the second scan line detecting means and having a number equal to or greater than the sixth threshold in the sub-scanning direction is determined as a color document, A second color / monochrome determination unit that determines the original having only a number less than the sixth threshold in the sub-scanning direction as the black and white original for the read line having the saturation having the pixel group equal to or greater than the fifth threshold. The image reading apparatus according to claim 1, wherein the image reading apparatus is an image reading apparatus.

It said fourth threshold is 50, the fifth threshold value is 2, the image reading apparatus according to claim 4, wherein said sixth threshold is 30.

In the pixel having saturation, the absolute value of the difference between the obtained values is smaller than the seventh threshold value by subtracting the minimum value of the three component pixel values of R, G, and B from the values of the other components. the image reading apparatus according to any one of claims 1 to 5, characterized in that also a big pixel.

And an image reading apparatus according to any one of claims 1 to 6, the original image forming apparatus and controls the image forming in accordance with a color or monochrome document or the determination result.

And an image reading apparatus according to any one of claims 1 to 6, the original image transmission apparatus and controls the image transmission in accordance with a color or monochrome document or the determination result.

  A document color / monochrome determination method in an image reading apparatus having a reading mode for reading an image of a document while the document is being conveyed from a supply side to a discharge side,
  The main scanning direction determines whether the color / monochrome document in the main scanning direction is a color document or a black and white document by paying attention to the number of pixels with saturation that appear consecutively in the main scanning direction perpendicular to the document transport direction. Color / black and white judgment process,
  The sub-scanning direction color / monochrome determination means determines whether a color document or a black-and-white document by paying attention to the number of pixels with saturation appearing continuously in the sub-scanning direction parallel to the document transport direction. With color / monochrome judgment process
  In a reading mode for reading an image of a document during conveyance, it is determined whether the document is a color document or a monochrome document in the color / monochrome determination process in the sub-scanning direction instead of the color / monochrome determination process in the main scanning direction. A color / monochrome determination method for an original in an image reading apparatus characterized by the above.

It further has a reading mode for reading an image of a document stationary on the platen,
In a reading mode for reading an image of a document during conveyance, a color / monochrome determination process in the sub-scanning direction determines whether the document is a color document or a monochrome document, and the document that is stationary on the platen on which the document is placed In the reading mode for reading the image, the color / monochrome determination process in the sub-scanning direction or the color / monochrome determination process in the main scanning direction determines whether the document is a color document or a monochrome document,
The color / monochrome determination process in the sub-scanning direction is
The first reading line detection means includes a reading line having a pixel group continuously having a number of pixels having saturation in the main scanning direction by a number equal to or greater than the first threshold in the main scanning direction. A first reading line detecting step of detecting as a reading line having a degree;
The first color / monochrome determination means continuously outputs the read lines having the saturation having the pixel group equal to or higher than the second threshold detected in the first read line detection step by the number equal to or higher than the third threshold in the sub-scanning direction. The original having a color group and the reading line having the saturation having the pixel group equal to or higher than the second threshold is continuously black-and-white that has a number less than the third threshold in the sub-scanning direction. A first color / black-and-white determination step for determining a document,
The color / monochrome determination process in the main scanning direction includes
The second reading line detecting means has a saturation of a reading line having a pixel group continuously having a number of pixels having saturation in the main scanning direction by a number equal to or greater than the fourth threshold in the main scanning direction. A second reading line detection step of detecting as a reading line having
The second color / monochrome determination unit has the number of read lines having the saturation having the pixel group equal to or higher than the fifth threshold detected in the second read line detection step in the sub-scanning direction. A second color that determines a document as a color document, and determines a document that has a saturation reading line having a pixel group equal to or greater than the fifth threshold as a monochrome document in a sub-scanning direction that is less than the sixth threshold. 10. The document color / monochrome determination method in the image reading apparatus according to claim 9, further comprising: a monochrome determination step.

A computer program for causing a computer to execute the steps of the color / monochrome determination method for an original according to claim 9 or 10 .

A computer-readable storage medium storing the computer program according to claim 11 .