Method and apparatus with contrast adjustment
A method with image processing includes: setting an offset window for an offset pattern of a kernel offset and an offset parameter for an application intensity of the kernel offset; determining an output kernel by applying the kernel offset to an input kernel based on the offset window and the offset parameter; and adjusting contrast of a degraded image using the output kernel.
1. An image processing method, comprising:
adjusting a size of an input kernel;
setting an offset window for an offset pattern of a kernel offset and an offset parameter for an application intensity of the kernel offset;
determining an output kernel by applying the kernel offset to the input kernel based on the offset window and the offset parameter; and
adjusting contrast of a degraded image using the output kernel,
wherein the setting of the offset window and the offset parameter comprises setting a size of the offset window and the offset parameter based on the adjusted size of the input kernel.
2. The method of claim 1 , wherein the setting of the offset window and the offset parameter comprises:
setting a distribution type of offset values in the offset window; and
setting a distribution parameter specifying a detailed distribution of the distribution type.
3. The method of claim 2 , wherein
the distribution type comprises a Gaussian distribution, and
the distribution parameter comprises a standard deviation of the Gaussian distribution.
4. The method of claim 1 , wherein the setting of the offset window and the offset parameter comprises:
setting a contrast adjustment parameter for a contrast adjustment degree; and
setting the offset parameter by normalizing the contrast adjustment parameter based on the offset values of the offset window.
5. The method of claim 4 , wherein the step of setting the contrast adjustment parameter comprises setting the contrast adjustment parameter based on an image characteristic of the degraded image.
6. The method of claim 4 , wherein
a size of the offset window corresponds to a size of the input kernel, and
an intensity of the contrast adjustment parameter is adjusted based on the size of the offset window according to the normalizing.
7. The method of claim 1 , further comprising:
detecting a first area and a second area having different image characteristics in the degraded image,
wherein the setting of the offset window and the offset parameter comprises individually setting the offset window and the offset parameter for each of the first area and the second area.
8. The method of claim 7 , wherein
the first area and the second area respectively correspond to a flat area and an edge area, and
the setting of the offset window and the offset parameter comprises:
setting a size of a first offset window for the first area to be larger than that of a second offset window for the second area; and
setting an intensity of the first offset parameter for the first area to be weaker than that of the second offset parameter for the second area.
9. The method of claim 1 , wherein the determining of the output kernel comprises:
determining a new input kernel by applying the kernel offset to the input kernel; and
determining the output kernel by normalizing the new input kernel based on kernel values of the new input kernel.
10. A non-transitory computer-readable storage medium storing instructions that, when executed by a processor, configure the processor to perform the method of claim 1 .
11. An image processing apparatus, comprising:
a processor configured to:
adjust a size of an input kernel;
set an offset window for an offset pattern of a kernel offset and an offset parameter for an application intensity of the kernel offset,
determine an output kernel by applying the kernel offset to the input kernel based on the offset window and the offset parameter, and
adjust contrast of a degraded image using the output kernel,
wherein the setting of the offset window and the offset parameter comprises setting a size of the offset window and the offset parameter based on the adjusted size of the input kernel.
12. The apparatus of claim 11 , wherein, for the setting of the offset window and the offset parameter, the processor is further configured to:
set a distribution type of offset values in the offset window, and
set a distribution parameter specifying a detailed distribution of the distribution type.
13. The apparatus of claim 11 , wherein, for the setting of the offset window and the offset parameter, the processor is further configured to:
set a contrast adjustment parameter for a contrast adjustment degree, and
set the offset parameter by normalizing the contrast adjustment parameter based on the offset values of the offset window.
14. The apparatus of claim 11 , wherein the processor is further configured to:
detect a first area and a second area having different image characteristics in the degraded image, and
for the setting of the offset window and the offset parameter, individually set the offset window and the offset parameter for each of the first area and the second area.
15. The apparatus of claim 14 , wherein
the first area and the second area respectively correspond to a flat area and an edge area, and
for the setting of the offset window and the offset parameter, the processor is further configured to:
set a size of a first offset window for the first area to be larger than that of a second offset window for the second area, and
set an intensity of the first offset parameter for the first area to be weaker than that of the second offset parameter for the second area.
16. The apparatus of claim 11 , wherein, for the determining of the output kernel, the processor is further configured to:
determine a new input kernel by applying the kernel offset to the input kernel, and
determine the output kernel by normalizing the new input kernel based on kernel values of the new input kernel.
17. The apparatus of claim 11 , further comprising a memory storing instructions that, when executed by the processor, configure the processor to perform the setting of the offset window and the offset parameter, the determining of the output kernel, and the adjusting of the contrast.
18. An electronic device comprising:
a processor configured to:
set a distribution type of offset values in an offset window, and a distribution parameter specifying a detailed distribution of the distribution type,
set the offset window based on the distribution type and the distribution parameter,
set a contrast adjustment parameter for a contrast adjustment degree,
set an offset parameter by normalizing the contrast adjustment parameter based on the offset values of the offset window,
determine an output kernel by applying a kernel offset to an input kernel based on the offset window and the offset parameter, and
adjust contrast of a degraded image using the output kernel.
19. The electronic device of claim 18 , wherein the processor is further configured to:
determine a new input kernel by applying the kernel offset to the input kernel, and
determine the output kernel by normalizing the new input kernel based on kernel values of the new input kernel.
20. An electronic device comprising:
one or more sensors configured to obtain an input image; and
one or more processors configured to:
determine a kernel offset based on a distribution parameter and a contrast adjustment parameter;
determine an output kernel by applying the kernel offset to an input kernel; and
determine an output image by applying the output kernel to the input image,
wherein the determining of the output kernel comprises:
determining a new input kernel by applying the kernel offset to the input kernel; and
determining the output kernel by normalizing the new input kernel based on kernel values of the new input kernel.
21. The electronic device of claim 20 , wherein, for the determining of the kernel offset, the one or more processors are configured to:
determine an offset window based on the distribution parameter;
determine an offset parameter based on the contrast adjustment parameter; and
determine the kernel offset based on the offset window and the offset parameter.
22. The electronic device of claim 21 , wherein kernel values of the offset window increase towards a central portion of the offset window and decrease towards an outer portion of the offset window.
23. The electronic device of claim 20 , wherein
the one or more sensors comprise an under-display camera (UDC), and
for the obtaining of the input image, the UDC is configured to obtain a degraded image.