JP2009032021A5

JP2009032021A5 -

Info

Publication number: JP2009032021A5
Application number: JP2007195052A
Authority: JP
Filing date: 2007-07-26
Publication date: 2010-03-25
Anticipated expiration: 2027-07-26

Claims

An image processing apparatus for identifying a portion where a predetermined object exists in an image,
A first partial image data generation unit configured to generate first partial image data representing at least a part of an image of the original image data based on a reference gradation value relating to a pixel color based on the original image data;
By converting a reference gradation value included in at least a part of the numerical range of the first partial image data into a reference gradation value corresponding to a brighter color when a predetermined first condition is satisfied A second partial image data generation unit for generating second partial image data;
Whether or not the image of the first partial image data includes a predetermined object based on the reference gradation value of the first partial image data when the first condition is not satisfied. When the first condition is satisfied, whether the image of the second partial image data includes the predetermined object based on the reference gradation value of the second partial image data A determination unit for determining whether or not,
Based on the portion corresponding to the image of the first or second partial image data determined to include the predetermined object in the image of the original image data, the predetermined in the image of the original image data An object processing unit comprising: an object specifying unit that determines a portion where the object exists.

The apparatus of claim 1, comprising:
The apparatus, wherein the reference gradation value is a gradation value representing the brightness of a pixel.

The apparatus according to claim 1 or 2, comprising:
The at least part of the numerical value range includes a range from a reference gradation value corresponding to a darkest color to 25% of a width of the possible range among possible ranges of the reference gradation value.

The apparatus of claim 3, wherein
The second partial image data generation unit performs the conversion by changing the reference gradation value by a predetermined amount.

An apparatus according to claim 4, wherein
The predetermined amount is 10% to 40% of a width of a range that the reference gradation value can take.

An apparatus according to any one of claims 1 to 5,
The reference gradation value is a gradation value representing a darker color as the value of the reference gradation value is smaller when other conditions are the same,
The first condition includes an apparatus in which an average value of reference gradation values of pixels of the first partial image data is smaller than a predetermined threshold value.

An apparatus according to any one of claims 1 to 5,
The reference gradation value is a gradation value representing a darker color as the value of the reference gradation value is smaller when other conditions are the same,
The first condition is that when the image area of the first partial image data is divided into a first area and a second area surrounding the first area, the first area The average value of the reference gradation values of the pixels included in the device is smaller than a predetermined threshold value.