Method, apparatus, and recording medium for processing image
A method, performed by a device, of processing an image, may include obtaining a circular image generated by photographing a target space through a fisheye lens; generating metadata including lens shading compensation information for correcting color information of the obtained circular image; and transmitting the obtained circular image and the metadata to a terminal.
1. A method of processing an image by an electronic device, the method comprising:
obtaining a plurality of circular images captured by at least one fisheye lens and fisheye information including camera parameters of the at least one fisheye lens and lens shading compensation information including coefficients of a polynomial function for each of RGB colors of the plurality of circular images and a number of the coefficients;
obtaining lens shading compensation values for the RGB colors of the plurality of circular images based on the obtained lens shading compensation information;
performing compensation of the plurality of the circular images based on the obtained lens shading compensation values; and
rendering the plurality of compensated circular images using the fisheye information,
wherein the polynomial function represents relation between the lens shading compensation values for the plurality of circular images and a distance from a center of an image of the plurality of circular images, and
wherein the polynomial function is w=Σ i=1 N p i-1 ·r i-1 , where w is a lens shading compensation value for one of the RGB colors, N is the number of the coefficients, p i-1 is a coefficient and r is the distance from the center of the image.
2. The method of claim 1 , wherein the performing of the compensation comprises correcting color information of each of a plurality of regions in the circular image based on the determined lens shading compensation values for the plurality of regions.
3. The method of claim 1 , wherein the coefficients indicate a correspondence between a plurality of regions in the circular image, identified based on the distance from the center of the image.
4. A device of processing an image, the device comprising:
a photographing unit;
a communicator; and
a processor coupled with the communicator and the photographing unit and configured to:
obtain a plurality of circular images via at least one fisheye lens of the photographing unit;
obtain fisheye information including field of view and camera parameters of the at least one fisheye lens and lens shading compensation information including coefficients of a polynomial function for each of RGB colors of the plurality of circular images and a number of the coefficients; and
transmit, via the communicator, the obtained circular images and the lens shading compensation information to a terminal,
wherein the polynomial function represents relation between the lens shading compensation values for the plurality of circular images and a distance from a center of an image of the plurality of circular images,
wherein the polynomial function is w=Σ i=1 N p i-1 ·r i-1 , where w is a lens shading compensation value for one of the RGB colors, N is the number of the coefficients, p i-1 is a coefficient and r is the distance from the center of the image,
wherein the plurality of the circular images are compensated based on the lens shading compensation values, and
wherein the compensated circular images are rendered using the fisheye information.
5. The device of claim 4 , wherein color information of each of a plurality of regions in the image is corrected based on the lens shading compensation values for the plurality of regions.
6. The device of claim 4 , wherein the coefficients indicate a correspondence between a plurality of regions in the circular image, identified based on the distance from the center of the image.
7. An electronic device of processing an image, the electronic device comprising:
a communicator; and
a processor coupled with the communicator and configured to:
obtain a plurality of circular images captured by at least one fisheye lens and fisheye information including camera parameters of the at least one fisheye lens and lens shading compensation information including coefficients of a polynomial function for each of RGB colors of the plurality of circular images and a number of the coefficients,
obtain the lens shading compensation values for the RGB colors of the plurality of circular images based on the obtained lens shading compensation information,
perform compensation of the plurality of the circular images based on the obtained lens shading compensation values, and
render the compensated circular images using the fisheye information,
wherein the polynomial function represents relation between the lens shading compensation values for the plurality of circular images and a distance from a center of an image of the plurality of circular images, and
wherein the polynomial function is w=Σ i=1 N p i-1 ·r i-1 , where w is a lens shading compensation value for one of the RGB colors, N is the number of the coefficients, p i-1 is a coefficient and r is the distance from the center of the image.
8. The electronic device of claim 7 , wherein the processor is further configured to:
correct color information of each of a plurality of regions in the circular image based on the determined lens shading compensation values for the plurality of regions.
9. The electronic device of claim 7 , wherein the coefficients indicate a correspondence between a plurality of regions in the circular image, identified based on the distance from the center of the image.
10. A non-transitory computer-readable recording medium having recorded thereon instructions for executing the method of claim 1 on a computer.