JP2017152866A5 - - Google Patents

Claims (14)

Subject detection means for detecting a subject in the image of interest;
State detecting means for detecting a shadow state indicating a degree of shadow for each subject;
Based on the detected shadow state, a target for each target subject in the image of interest is arranged so that the order of the degree of shadow before correction of the subject and the order of shadow after correction are not interchanged. Target setting means for setting a target shadow state that is a shadow state to become,
A light source setting unit that determines a setting of a virtual light source for each target subject based on the shadow state detected by the state detection unit and the target shadow state for the target image;
An image processing apparatus comprising: a correction unit that corrects the brightness of the subject subject in the image of interest using the virtual light source.   When a plurality of subjects are detected by the subject detection unit, a subject selected from the plurality of subjects based on the shadow state of each subject detected by the state detection unit becomes the target. The image processing apparatus according to claim 1, wherein the image processing apparatus is a subject.   The shadow state is information representing a characteristic of a shadow generated in a subject area corresponding to the subject by ambient light illuminating the subject when the target image is captured. The image processing apparatus according to 1 or 2. Wherein A shadow state, the brightness distribution in the subject Utsushitai area, information indicating the contrast in the subject area, and contours of the characteristics of the area shadow occurs in the subject area, the The image processing apparatus according to claim 1, further comprising at least one piece of information representing an area of a shaded area in the subject area.   In the target image, the target setting unit reduces the shadow level for a subject with the highest shadow level and increases the shadow level for a subject with the lowest shadow level in the target image. The image processing apparatus according to any one of claims 1 to 4, wherein the image processing apparatus is determined.   The target setting means calculates an evaluation value representing a shadow state of a subject for each of the plurality of subjects, and determines the target shadow state so that the evaluation value becomes a target evaluation value. The image processing apparatus according to any one of claims 1 to 5.   The image processing apparatus according to claim 6, wherein the evaluation value is a contrast value indicating a luminance ratio between a highest luminance portion and a lowest luminance portion in the subject area.   The target setting means sets the target shadow state to a different state for each subject or sets the same state between subjects based on a result of comparing the evaluation values for the plurality of subjects in the target image. The image processing apparatus according to claim 6, wherein the image processing apparatus determines whether or not.   The target setting means determines that the target shadow state is different for each subject when a difference in the evaluation values among the plurality of subjects is larger than a predetermined value. The image processing apparatus according to 8.   The image processing according to claim 6, wherein the target setting unit determines the target subject based on a result of comparing the evaluation values for the plurality of subjects. apparatus.   11. The setting of the virtual light source includes a position of the virtual light source with respect to the subject and an intensity of virtual illumination light emitted from the virtual light source. Image processing apparatus. The shaded state is indicated by a contrast value that is information representing contrast in the subject area,
When the target contrast value indicating the target shadow state is smaller than the contrast value indicating the shadow state detected by the state detection unit, the light source setting unit determines the position of the virtual light source as the normal of the subject. If the contrast value indicating the shadow state detected by the state detection means is smaller than the target contrast value indicating the target shadow state, the opposite side to the ambient light illuminating the subject, The image processing apparatus according to claim 11, wherein the position of the virtual light source is set on the same side as the ambient light with respect to the normal line of the subject. Subject detection means for detecting a subject in the image of interest;
State detecting means for detecting a shadow state indicating a degree of shadow for each subject;
Based on the detected shadow state, a target for each target subject in the image of interest is arranged so that the order of the degree of shadow before correction of the subject and the order of shadow after correction are not interchanged. Target setting means for setting a target shadow state that is a shadow state to become,
A light source setting unit that determines a setting of a virtual light source for each target subject based on the shadow state detected by the state detection unit and the target shadow state for the target image;
A program for causing a computer to function as correction means for correcting the brightness of the subject subject in the image of interest using the virtual light source. A subject detection step of detecting a subject in the image of interest;
A state detection step of detecting a shadow state indicating a degree of shadow for each subject;
Based on the detected shadow state, a target for each target subject in the image of interest is arranged so that the order of the degree of shadow before correction of the subject and the order of shadow after correction are not interchanged. A target setting step for setting a target shadow state, which is a shadow state to become,
A light source setting step for determining a setting of a virtual light source for each target subject based on the shadow state detected by the state detection step and the target shadow state for the target image;
And a correction step of correcting the brightness of the subject subject in the image of interest using the virtual light source.