Image processing device, image processing method, and program

Abstract

This technology enables stable exposure even when flickering occurs in the area where the subject is detected. [Solution] The image processing apparatus includes: a first acquisition means for acquiring an image; a first detection means for detecting a first region in the image that includes a subject; a second detection means for detecting a second region in the image; a second acquisition means for acquiring a photometric result based on the brightness of the region where the first region and the second region overlap when the state of the subject is in a predetermined state; a first determination means for determining a change in the second region based on a reference region of the second region; and a determination means for determining the exposure based on the determination result by the first determination means and the photometric result obtained by the second acquisition means.

Claims

1. A first acquisition means for acquiring an image, A first detection means for detecting a first region including the subject in the aforementioned image, A second detection means for detecting a second region in the aforementioned image, When the state of the subject is in a predetermined state, a second acquisition means acquires a photometric result based on the brightness of the region where the first region and the second region overlap, A first determination means for determining changes in the second region based on a reference region of the second region, An image processing apparatus characterized by having a determination means for determining exposure based on the determination result by the first determination means and the photometric result obtained by the second acquisition means.

2. It has a second determination means for determining the state of the subject, The image processing apparatus according to claim 1, characterized in that the second determination means determines the orientation of the subject.

3. It has a second determination means for determining the state of the subject, The image processing apparatus according to claim 1, wherein the second determination means determines whether or not the subject has an ornament.

4. The image processing apparatus according to claim 2, characterized in that the predetermined state includes a state in which the subject is facing forward or to the side.

5. The image processing apparatus according to claim 1, characterized in that the first determination means determines the reference region based on the detection results of the first region and the second region included in a plurality of images acquired in a time series.

6. The image processing apparatus according to claim 5, characterized in that the first determination means determines as the reference region an area in which the area where the first region and the second region overlap is detected a predetermined number of times or more in the plurality of images.

7. The image processing apparatus according to claim 5, characterized in that the first determination means determines as the reference region an area in which the size of the area in which the first region and the second region detected from the plurality of images overlap is equal to or greater than a threshold.

8. The image processing apparatus according to claim 5, characterized in that the first determination means determines the reference region when the number of images is greater than or equal to a predetermined number.

9. The image processing apparatus according to claim 1, characterized in that the first determination means determines a change in the second region based on the degree of agreement between the second region and the reference region.

10. The image processing apparatus according to claim 9, characterized in that the first determination means determines that there is a change in the second region when the degree of agreement between the second region and the reference region is less than a threshold.

11. The first determination means determines whether or not to determine whether or not to determine a change in the second region based on the state of the subject and / or the brightness value of the image. The image processing apparatus according to claim 1, characterized in that if a change in the second region is not determined, the reference region is initialized.

12. The image processing apparatus according to claim 9, characterized in that the second acquisition means acquires the photometric result based on the brightness of the region where the first region and the second region overlap when the first determination means determines that there is no change in the second region.

13. The image processing apparatus according to claim 1, characterized in that the second acquisition means calculates a photometric value from the difference between the luminance value of the region where the first region and the second region overlap and the target luminance value of the first region.

14. The image processing apparatus according to claim 1, characterized in that the second acquisition means calculates a photometric value from the difference between the luminance value of the region where the first region and the second region overlap and the luminance value of the first region and the target luminance value of the image.

15. An imaging means for capturing the aforementioned image, It includes a control means for controlling the exposure when capturing the aforementioned image, The determination means calculates an exposure compensation value based on the photometric result, The image processing apparatus according to claim 13, characterized in that the control means controls the exposure when capturing the image based on the exposure compensation value.

16. The second acquisition means does not acquire the photometric result if the state of the subject is not the predetermined state. The image processing apparatus according to claim 15, characterized in that the determination means calculates the exposure compensation value based on the photometric result obtained in the previous processing.

17. The second acquisition means does not acquire the photometric result if it is determined that there is a change in the second region. The image processing apparatus according to claim 15, characterized in that the determination means calculates the exposure compensation value based on the photometric result obtained in the previous processing.

18. The first region mentioned above is the facial region of a person, The image processing apparatus according to claim 1, characterized in that the second region is a skin region.

19. The image processing apparatus according to claim 18, characterized in that the change in the second region includes a state in which a brightness difference occurs in the skin region.

20. An image processing method performed in an image processing device, Steps to acquire an image, The steps include detecting a first region in the aforementioned image that includes the subject, The steps include detecting a second region having predetermined characteristics in the aforementioned image, When the state of the subject is in a predetermined state, the step of obtaining a photometric result based on the brightness of the region where the first region and the second region overlap, A step of determining the change in the second region based on the reference region of the second region, An image processing method characterized by comprising the step of determining exposure based on the result of determining the change in the second region and the photometric result.

21. A program for causing a computer to function as one of the means of an image processing apparatus according to any one of claims 1 to 19.

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