Image processing apparatus and method
Provided is an image processing apparatus and a method to improve the robustness of posture estimation during viewing of contents with respect to a projected image. Similarity between a captured image obtained by imaging a projected image by an imaging unit, the projected image having been projected by a projection unit, and a simulation image simulating a captured image supposed to be obtained by imaging a projected image by the imaging unit, the projected image having been projected by the projection unit, is evaluated, and a posture of the projection unit or the imaging unit or postures of both of the projection unit and the imaging unit on the basis of an evaluation result of the similarity are set.
1. An image processing apparatus, comprising:
circuitry configured to:
evaluate a similarity between a captured image and a simulation image, wherein
the captured image is captured by an imaging operation of a projected image,
the captured image is captured by a camera,
the projected image is projected by a projector, and
the simulation image is obtained by simulation of an image obtained by the imaging operation of the projected image;
obtain corresponding points in the captured image and the simulation image;
evaluate a distance between the corresponding points in the captured image and the simulation image; and
set a posture of at least one of the projector or the camera as an estimation result, based on an evaluation result of the evaluated similarity and an evaluation result of the evaluated distance between the corresponding points.
2. The image processing apparatus according to claim 1 , wherein
the circuitry is further configured to set postures of both of the projector and the camera as the estimation result, and
the postures have an optimum similarity evaluated based on a plurality of simulation images and the captured image.
3. The image processing apparatus according to claim 2 , wherein the circuitry is further configured to:
obtain a sum of differences in absolute values of luminance values of a plurality of pixels between the simulation image and the captured image, as an evaluation value indicating the evaluated similarity; and
set the posture of the at least one of the projector or the camera based on a minimum evaluation value, as the estimation result.
4. The image processing apparatus according to claim 2 , wherein the circuitry is further configured to:
obtain a sum of squares of differences in luminance values of a plurality of pixels between the simulation image and the captured image, as an evaluation value indicating the evaluated similarity; and
set the posture of the at least one of the projector or the camera based on a minimum evaluation value, as the estimation result.
5. The image processing apparatus according to claim 2 , wherein the circuitry is further configured to:
obtain normalized cross-correlation between the simulation image and the captured image, as an evaluation value indicating the evaluated similarity; and
set the posture of the at least one of the projector or the camera based on a maximum evaluation value, as the estimation result.
6. The image processing apparatus according to claim 2 , wherein the circuitry is further configured to:
obtain zero-mean normalized cross-correlation between the simulation image and the captured image, as an evaluation value indicating the evaluated similarity; and
set the posture of the at least one of the projector or the camera based on a maximum evaluation value, as the estimation result.
7. The image processing apparatus according to claim 1 , wherein the circuitry is further configured to:
set a virtual posture of the at least one of the projector or the camera; and
generate the simulation image obtained at the virtual posture.
8. The image processing apparatus according to claim 7 , wherein the circuitry is further configured to generate the simulation image with one of a luminance value or a specific color component.
9. The image processing apparatus according to claim 1 , wherein the circuitry is further configured to evaluate the similarity between a reduced image of the captured image and a reduced image of the simulation image.
10. The image processing apparatus according to claim 1 , wherein
the circuitry is further configured to evaluate the similarity between a simulation image and a partial image of the captured image, and
the partial image, in a specific range of the captured image, comprises an image of an object.
11. The image processing apparatus according to claim 1 , wherein the circuitry is further configured to repeat the evaluation of the similarity a plurality of times.
12. The image processing apparatus according to claim 11 , wherein
the circuitry is further configured to repeat the evaluation of the similarity the plurality of times based on one of a resolution of the captured image or a range of a partial image,
the partial image, in the captured image, comprises an image of an object, and
the resolution of the captured image and the range of the partial image are variable at each time of the plurality of times.
13. The image processing apparatus according to claim 1 , wherein the circuitry is further configured to:
evaluate the similarity between the captured image and the simulation image between each of a plurality of projectors and each of a plurality of cameras; and
set a plurality of postures of the plurality of projectors or the plurality of cameras, based on a plurality of evaluation results of the similarity between each of the plurality of projectors and each of the plurality of cameras.
14. The image processing apparatus according to claim 1 , the circuitry is further configured to perform setting process regarding geometric correction of the projected image, based on the set posture.
15. The image processing apparatus according to claim 1 , further comprising the projector configured to project the projected image.
16. The image processing apparatus according to claim 1 , further comprising:
the camera configured to capture the projected image.
17. An image processing method, comprising:
evaluating a similarity between a captured image and a simulation image, wherein
the captured image is captured by an imaging operation of a projected image,
the captured image is captured by a camera,
the projected image is projected by a projector, and
the simulation image is obtained by simulation of an image obtained by the imaging operation of the projected image;
obtaining corresponding points in the captured image and the simulation image;
evaluating a distance between the corresponding points in the captured image and the simulation image;
setting a posture of at least one of the projector or the camera as an estimation result, based on an evaluation result of the evaluated similarity and an evaluation result of the evaluated distance between the corresponding points; and
setting geometric correction of the projected image, based on the set posture.
18. An image processing apparatus, comprising:
circuitry configured to:
evaluate a similarity between a captured image and a simulation image, wherein
the captured image is captured by an imaging operation of a projected image,
the captured image is captured by a camera,
the projected image is projected by a projector, and
the simulation image is obtained by simulation of an image obtained by the imaging operation of the projected image;
repeat the evaluation of the similarity a plurality of times based on one of a resolution of the captured image or a range of a partial image, wherein
the partial image, in the captured image, comprises an image of an object, and
the resolution of the captured image and the range of the partial image are variable at each time of the plurality of times; and
set a posture of at least one of the projector or the camera as an estimation result, based on an evaluation result of the repeated evaluation of the similarity.