Image processing apparatus, image processing method, and non-transitory computer-readable recording medium
An image processing apparatus comprises a specific object detection unit configured to detect a specific object from a moving image, a setting unit configured to set, in the moving image, based on a position of the specific object, a region of interest which is a region for performing an encoding process that produces a relatively higher image quality than in another region other than the region of interest, a moving object detection unit configured to detect a moving object from the moving image, and an encoding unit configured to perform an encoding process using, in the region of interest, an encoding parameter that can produce a relatively higher image quality than an encoding parameter used in the other region, when the moving object is detected in the region of interest.
1. An image processing apparatus comprising:
(a) one or more processors that execute instructions and/or (b) one or more circuits, configured so as to act as a plurality of units comprising:
(1) a specific object detection unit configured to detect a specific object from an image;
(2) a setting unit configured to set a region of interest in the image based on an image region of the specific object detected by the specific object detection unit;
(3) a moving object detection unit configured to detect a moving object from the image; and
(4) an encoding unit configured to (a) encode, using a first encoding parameter, a region of interest from which the moving object is not detected, the region of interest being among a plurality of regions of interest that are set by the setting unit, and (b) encode, using a second encoding parameter capable of encoding with a relatively higher image quality than the first encoding parameter, a region of interest from which the moving object is detected, the region of interest being among the plurality of regions of interest that are set by the setting unit.
2. The apparatus according to claim 1 , wherein the setting unit sets the region of interest in the image based on an image region of the specific object which is determined as a still object.
3. The apparatus according to claim 1 , wherein the encoding unit encodes, using the first encoding parameter, another region other than the region of interest that is set by the setting unit.
4. The apparatus according to claim 1 , wherein the setting unit deletes, from among the plurality of regions of interest that are set by the setting unit, a region of interest from which the specific object has not been detected for a predetermined time or more.
5. The apparatus according to claim 1 , wherein the setting unit sets, as the region of interest, a region obtained by expanding an image region of the specific object.
6. The apparatus according to claim 5 , wherein the setting unit determines a magnification for expanding the image region of the specific object in accordance with an attribute of the specific object.
7. The apparatus according to claim 1 , wherein the encoding unit encodes, using the second encoding parameter, a region of interest from which the moving object is detected continuously during a period in accordance with an attribute of the specific object.
8. The apparatus according to claim 1 , the encoding unit encodes, using the second encoding parameter in accordance with an attribute of the specific object corresponding to the region of interest from which the moving object is detected, a region of interest from which the moving object is detected.
9. The apparatus according to claim 1 , wherein each of the first encoding parameter and the second encoding parameter is a quantization parameter.
10. The apparatus according to claim 1 , wherein the moving object detection unit detects a foreground from the image using a background difference method to detect the foreground as the moving object.
11. The apparatus according to claim 1 , further comprising an image capturing unit configured to capture the image.
12. An image processing method comprising:
detecting a specific object from an image;
setting a region of interest in the image based on an image region of the detected specific object;
detecting a moving object from the image; and
encoding, using a first encoding parameter, a region of interest from which the moving object is not detected, the region of interest being among a plurality of regions of interest that are set by the setting; and
encoding, using a second encoding parameter capable of encoding with a relatively higher image quality than the first encoding parameter, a region of interest from which the moving object is detected, the region of interest being among the plurality of regions of interest that are set by the setting.
13. A non-transitory computer-readable recording medium storing a program for causing a computer to function as:
(1) a specific object detection unit configured to detect a specific object from an image;
(2) a setting unit configured to set a region of interest in the image based on an image region of the specific object detected by the specific object detection unit;
(3) a moving object detection unit configured to detect a moving object from the image; and
(4) an encoding unit configured to (a) encode, using a first encoding parameter, a region of interest from which the moving object is not detected, the region of interest being among a plurality of regions of interest that are set by the setting unit, and (b) encode, using a second encoding parameter capable of encoding with a relatively higher image quality than the first encoding parameter, a region of interest from which the moving object is detected, the region of interest being among the plurality of regions of interest that are set by the setting unit.