Electronic device and HDR image generation method therefor
An electronic device and a high dynamic range (HDR) image generation method therefore are provided. The electronic device includes an image sensor and a processor, wherein the processor can be configured to adjust the exposure of the image sensor so as to acquire a first image having a first brightness and a plurality of second images having a second brightness, perform, on the first image, brightness conversion and noise attenuation of at least a first intensity so as to provide a third image having the second brightness, and generate a second HDR image on the basis of the first image and the third image, and generate a second HDR image on the basis of the first HDR image and the plurality of second images.
1. An electronic device comprising:
an image sensor; and
a processor,
wherein the processor is configured to:
acquire a first image having a first brightness and a plurality of second images having a second brightness, by adjusting an exposure of the image sensor,
provide a third image having the second brightness, by performing, on the first image, brightness conversion and noise reduction of at least a first strength,
provide a first high dynamic range (HDR) image, based on the first image and the third image, and
provide a second HDR image, based on the first HDR image and the plurality of second images.
2. The electronic device of claim 1 ,
wherein the first brightness is a brightness lower than a reference brightness, and
wherein the second brightness is a brightness equal to or greater than the reference brightness.
3. The electronic device of claim 1 , wherein the processor provides the first HDR image, by performing, on the first image, brightness conversion and noise reduction of at least a second strength and then synthesizing the first image with the third image.
4. The electronic device of claim 3 , wherein the first strength is set based on a value obtained by multiplying the second strength by at least a digital gain value for bright converting the first brightness into the second brightness.
5. The electronic device of claim 1 , further comprising:
an HDR processing circuit,
wherein the HDR processing circuit performs an operation for providing the first HDR image and the second HDR image under control of the processor.
6. The electronic device of claim 1 , wherein the brightness conversion on the first image is performed by applying a digital gain value for converting the first brightness into the second brightness.
7. The electronic device of claim 1 , further comprising:
a touch screen,
wherein the processor is further configured to display an icon comprising a dynamic image indicating that image acquisition of the image sensor is being performed, on the touch screen.
8. The electronic device of claim 7 , wherein the processor is further configured to, after first acquiring an initial image of the second brightness by adjusting the exposure of the image sensor, acquire the first image and then acquire the plurality of second images.
9. The electronic device of claim 8 , wherein the processor is further configured to display a preview image for the initial image of the second brightness on the touch screen while at least the icon is displayed.
10. The electronic device of claim 9 , wherein the processor is further configured to, when the second HDR image is provided, display the second HDR image, in place of the preview image, on the touch screen.
11. A method of an electronic device comprising an image sensor and a processor, the method comprising:
acquiring a first image having a first brightness and a plurality of second images having a second brightness by adjusting an exposure of the image sensor;
providing a third image having the second brightness by performing, on the first image, brightness conversion and noise reduction of at least a first strength;
providing a first high dynamic range (HDR) image, based on the first image and the third image; and
providing a second HDR image, based on the first HDR image and the plurality of second images.
12. The method of claim 11 ,
wherein the first brightness is a brightness lower than a reference brightness, and
wherein the second brightness is a brightness equal to or greater than the reference brightness.
13. The method of claim 11 , wherein providing the first HDR image comprises:
providing the first HDR image, by performing, on the first image, brightness conversion and noise reduction of a second strength or less and then synthesizing the first image with the third image.
14. The method of claim 13 , wherein the first strength is set based on a value obtained by multiplying the second strength by at least a digital gain value for bright converting the first strength into the second strength.
15. The method of claim 11 , wherein the brightness conversion on the first image is performed by applying a digital gain value for converting the first brightness into the second brightness.