Electronic device comprising image sensor and method of operation thereof
According to certain embodiments, an image sensor including a pixel, the pixel including a micro lens, a plurality of photodiodes, and a color filter disposed between the plurality of photodiodes and the micro lens; a processor operatively connected to the image sensor; and a memory operatively connected to the processor, wherein the memory stores one or more instructions that, when executed by the image sensor, cause the image sensor to perform a plurality of operations, the plurality of operations comprising: determining whether the image sensor is in a high-resolution mode; when the image sensor is in the high-resolution mode, calculating a disparity based on signals detected from the plurality of photodiodes; when the disparity is not greater than a threshold value, applying a first remosaic algorithm to the signals; and when the disparity is greater than the threshold value, applying a second remosaic algorithm to the signals.
1. An electronic device comprising:
an image sensor including an array of pixels, each pixel of the array of pixels including a micro lens, a plurality of photodiodes, and a color filter disposed between the plurality of photodiodes and the micro lens;
a processor operatively connected to the image sensor; and
a memory operatively connected to the processor,
wherein the memory stores one or more instructions that, when executed by the image sensor, cause the image sensor to perform a plurality of operations, the plurality of operations comprising:
determining whether the image sensor is in a high-resolution mode;
according to a determination that the image sensor is in the high-resolution mode, calculating a disparity based on signals detected from the plurality of photodiodes by determining a distance between a first center vertical line of a first image and a second center vertical line of a second image, wherein the first image and the second image are formed based on the signals;
according to a determination that the disparity is not greater than a threshold value, applying a first remosaic algorithm to the signals to obtain a Bayer-patterned image wherein the Bayer-patterned image has a pixel corresponding to each photodiode in the array of pixels, and wherein each alternating location in each row includes a same color value; and
according to a determination that the disparity is greater than the threshold value, applying a second remosaic algorithm to the signals to obtain the Bayer-patterned image, and
wherein the threshold value is based on a user setting.
2. The electronic device of claim 1 , wherein the plurality of photodiodes are arranged in a square shape such that a horizontal number of photodiodes is identical to a vertical number of photodiodes, the square shape having a left half and a right half, and
wherein the plurality of operations further comprise:
synthesizing signals of photodiodes of the plurality of photodiodes of the left half to form the first image; and
synthesizing signals of photodiodes of the plurality of photodiodes of the right half, to form the second image.
3. The electronic device of claim 1 , wherein the first remosaic algorithm is an algorithm that forms the Bayer-patterned image based on the signals detected by the plurality of photodiodes while maintaining high resolution.
4. The electronic device of claim 1 , wherein the second remosaic algorithm is an algorithm that forms the Bayer-patterned image based on the signals detected by the plurality of photodiodes while compensating for an artifact occurring from a phase difference between signals.
5. The electronic device of claim 1 ,
wherein the plurality of operations further comprise:
applying the first remosaic algorithm to some pixels of the array of pixels and applying the second remosaic algorithm to some pixels of the array of pixels.
6. The electronic device of claim 1 , wherein the plurality of operations further comprise:
when a result of determining whether the image sensor is in the high-resolution mode indicates that the image sensor is in a low-resolution mode, processing the signals detected from the plurality of photodiodes included in the each pixel of the array of pixels, as a single signal.
7. The electronic device of claim 1 , wherein the plurality of operations further comprise:
when the disparity is not greater than the threshold value, determining that the image sensor is in a focused state; and
when the disparity is greater than the threshold value, determine that the image sensor is in an out-of-focus state.
8. The electronic device of claim 1 , wherein the second remosaic algorithm includes low pass filtering processing.
9. The electronic device of claim 1 , wherein whether the image sensor is in the high-resolution mode is determined by a power state of the electronic device, illuminance, or settings of a user.
10. An method by an electronic device including an image sensor, the method comprising:
determining, by the image sensor, whether the image sensor is in a high-resolution mode;
according to a determination that the image sensor is in the high-resolution mode, calculating a disparity based on signals detected from a plurality of photodiodes included in the image sensor by determining a distance between a first center vertical line of a first image and a second center vertical line of a second image, wherein the first image and the second image are formed based on the signals, wherein the image sensor includes an array of pixels, each pixel of the array of pixels having a micro lens and the plurality of photodiodes facing each other with a color filter interposed between the plurality of photodiodes and the micro lens;
according to a determination that the disparity is not greater than a threshold value, applying a first remosaic algorithm to the signals to obtain a Bayer-patterned image wherein the Bayer-patterned image has a pixel corresponding to each photodiode in the array of pixels, and wherein each alternating location in each row includes a same color value; and
according to a determination that the disparity is greater than the threshold value, applying a second remosaic algorithm to the signals to obtain the Bayer-patterned image, and
wherein the threshold value is based on a user setting.
11. The method of claim 10 , wherein the plurality of photodiodes are arranged in a square shape such that a horizontal number of photodiodes is identical to a vertical number of photodiodes, the square shape having a left half and a right half,
the method further comprising:
synthesizing signals of photodiodes of the plurality of photodiodes of the left half to form the first image; and
synthesizing signals photodiodes of the plurality of photodiodes of the right half, to form the second image.
12. The method of claim 10 , wherein the first remosaic algorithm is an algorithm that forms the Bayer-patterned image based on the signals detected by the plurality of photodiodes while maintaining the high-resolution mode.
13. The method of claim 10 , wherein the second remosaic algorithm is an algorithm that forms the Bayer-patterned image based on the signals detected by the plurality of photodiodes while compensating for an artifact occurring from a phase difference between signals.
14. The method of claim 10 ,
the method further comprising:
applying the first remosaic algorithm to some pixels of the array of pixels and applying the second remosaic algorithm to some pixels of the array of pixels.
15. The method of claim 10 , further comprising:
when a result of determining whether the image sensor is in the high-resolution mode indicates that the image sensor is in a low-resolution mode, processing the signals detected from the plurality of photodiodes included in the each pixel of the array of pixels, as a single signal.
16. The method of claim 10 , further comprising:
when the disparity is not greater than the threshold value, determining that the image sensor is in a focused state; and
when the disparity is greater than the threshold value, determining that the image sensor is in an out-of-focus state.
17. The method of claim 10 , wherein the second remosaic algorithm includes low pass filtering processing.
18. The method of claim 10 , wherein whether the image sensor is in the high-resolution mode is determined by a power state of the electronic device, illuminance, or settings of a user.