Backlight scene judging method
AssigneeKonica Minolta, Inc.
InventorHiroki Yoshida
Life of this patent
Estimating the term…
Abstract
In an image processing apparatus processing digitized image data taken by a digital camera, or the like, an image focused on an image pickup device is divided into a plurality of rectangular regions. A value of the lightness with respect to each rectangular region and a distribution of the color saturation are calculated by using image data. The scene of the image is judged whether it is backlighted or not by using a number of the rectangular regions having the value of the lightness equal to or larger than a threshold value. When the scene is judged as the backlight scene, it is further judged whether it is actually backlighted or not by using the distribution of the color saturation.
Claims26
A backlight scene judging method comprising steps of:
- a first judgment sensing lightness with respect to a plurality of regions in an image and judging whether the scene is backlighted or not corresponding to a number of regions having a lightness equal to or larger than a predetermined threshold value;
- and
- a second judgement calculating a distribution of color saturation of the image and judging whether the scene is backlighted or not based directly on the distribution of color saturation, wherein a color saturation value of a background and an object of the image is lower than a predetermined value when the scene is backlight.
An image processing apparatus comprising:
- a memory for storing data with respect to an image;
- a lightness sensing portion for dividing an image into a plurality of regions and for sensing lightness with respect to each region;
- a color saturation calculating portion for calculating a distribution of color saturation of the image from the data stored in the memory;
- and
- a judging portion for judging whether a scene is backlighted or not by directly using the lightness of each region sensed by the lightness sensing portion and the distribution of the color saturation obtained by the color saturation calculating portion, wherein a color saturation value of a background and an object of the image is lower than a predetermined value when the scene is backlight.
A computer readable medium storing a computer program for processing the following steps when it is stored in an image processing apparatus comprising the steps of:
- a first judgement sensing lightness with respect to a plurality of regions in an image and judging whether the scene is backlighted or not based directly on a number of regions having a lightness equal to or larger than a predetermined threshold value;
- and
- a second judgement calculating a distribution of color saturation of the image and judging whether the scene is backlighted or not corresponding to the distribution of color saturation, wherein a color saturation value of a background and an object of the image is lower than a predetermined value when the scene is backlight.
Dependencies are inferred from the claim text.