Electronic apparatus and method of controlling the same
An electronic apparatus is described. The electronic apparatus includes: an image sensor including a plurality of image pixels and a plurality of focal point detection pixels; an auto-focus (AF) detection unit that detects an AF value based on a first focal point detection signal output from a first focal point detection pixel from the plurality of focal point detection pixels and a second focal point detection signal output from a virtual second focal point detection pixel corresponding to the first focal point detection pixel; and a control unit that generates image data based on an image signal output from the plurality of image pixels and the AF value detected by the AF detection unit.
1. An electronic apparatus comprising:
an image sensor including a plurality of image pixels and a plurality of focal point detection pixels;
an auto-focus (AF) detection unit that detects an AF value based on a first focal point detection signal output from a first focal point detection pixel from the plurality of focal point detection pixels and a second focal point detection signal output from a virtual second focal point detection pixel corresponding to the first focal point detection pixel, wherein the plurality of focal point detection pixels comprise a plurality of horizontal focal point detection pixels and a plurality of vertical focal point detection pixels, wherein the plurality of image pixels and the plurality of focal point detection pixels are repeatedly arranged in the image sensor; and
a control unit that generates image data based on an image signal output from the plurality of image pixels and the AF value detected by the AF detection unit,
wherein a horizontal first focal point detection pixel and a vertical first focal point detection pixel are arranged in a first area of the image sensor, and a vertical second focal point detection pixel corresponding to the horizontal first focal point detection pixel and the vertical first focal point detection pixel is included in a second area adjacent to the first area in a horizontal direction.
2. The electronic apparatus of claim 1 , wherein the control unit selects the virtual second focal point detection pixel based on at least one image pixel adjacent to the first focal point detection pixel.
3. The electronic apparatus of claim 1 , wherein the first focal point detection pixel is the horizontal first focal point detection pixel, and the virtual second focal point detection pixel corresponds to the horizontal first focal point detection pixel.
4. The electronic apparatus of claim 1 , wherein the plurality of image pixels and the plurality of focal point detection pixels are repeatedly arranged in the image sensor,
wherein a vertical first focal point detection pixel and a horizontal first focal point detection pixel are arranged in a first area of the image sensor, and a horizontal second focal point detection pixel corresponding to the vertical first focal point detection pixel and the horizontal first focal point detection pixel is included in a second area adjacent to the first area in a vertical direction.
5. The electronic apparatus of claim 1 , wherein the first focal point detection pixel is one of a left or right focal point detection pixel that is pupil-segmented.
6. The electronic apparatus of claim 2 , wherein the control unit generates the second focal point detection signal based on an image signal output from the selected virtual second focal point detection pixel.
7. The electronic apparatus of claim 6 , wherein the AF detection unit detects a phase difference AF value from a phase difference between the first focal point detection signal output from the first focal point detection pixel and the second focal point detection signal generated from the virtual second focal point detection pixel.
8. The electronic apparatus of claim 6 , wherein the control unit generates the second focal point detection signal by dividing a sum of image signals of four G pixels that are vertically and horizontally adjacent to the first focal point detection pixel by 4.
9. The electronic apparatus of claim 6 , wherein the control unit generates the second focal point detection signal by dividing a sum of image signals of two G pixels that are horizontally adjacent to the first focal point detection pixel by 2.
10. The electronic apparatus of claim 6 , wherein the control unit generates the second focal point detection signal as an image signal of one G pixel horizontally adjacent to the first focal point detection pixel.
11. The electronic apparatus of claim 4 , wherein the first focal point detection pixel is the vertical first focal point detection pixel, and the virtual second focal point detection pixel corresponds to the vertical first focal point detection pixel.
12. The electronic apparatus of claim 5 , wherein the virtual second focal point detection pixel is one of a right or left focal point detection pixel that is pupil-segmented and corresponds to the one of the left or right focal point detection pixel that is pupil-segmented.
13. An image sensor for phase difference auto-focus (AF), comprising:
a plurality of image pixels and a plurality of focal point detection pixels that are repeatedly arranged; and
a horizontal first focal point detection pixel and a vertical first focal point detection pixel arranged in a first area,
wherein a horizontal AF value is detected based on a phase difference between a horizontal first focal point detection signal output from the horizontal first focal point detection pixel and a horizontal second focal point detection signal from a virtual second focal point detection pixel corresponding to the horizontal first focal point detection pixel, and
a vertical horizontal AF value is detected based on a phase difference between a vertical first focal point detection signal output from the vertical first focal point detection pixel and a vertical second focal point detection signal from a virtual second focal point detection pixel corresponding to the vertical first focal point detection pixel,
wherein the horizontal first focal point detection pixel and the vertical second focal point detection pixel are arranged in a second area that is horizontally adjacent to the first area.
14. The image sensor of claim 13 , wherein the first focal point detection pixel is one of a left or right focal point detection pixel that is pupil-segmented.
15. The image sensor of claim 13 , wherein the vertical first focal point detection pixel and the horizontal second focal point detection pixel are arranged in a second area that is vertically adjacent to the first area.
16. The image sensor claim 14 , wherein the virtual second focal point detection pixel is one of a right or left focal point detection pixel corresponding to the left or right focal point detection pixel that is pupil-segmented.
17. A method of controlling an electronic apparatus, the method comprising:
outputting a first focal point detection signal from a first focal point detection pixel from a plurality of focal point detection pixels of an image sensor including a plurality of image pixels and a plurality of focal point detection pixels, wherein the plurality of focal point detection pixels comprise a plurality of horizontal focal point detection pixels and a plurality of vertical focal point detection pixels, wherein the plurality of image pixels and the plurality of focal point detection pixels are repeatedly arranged in predetermined areas of the image sensor;
detecting an auto-focus (AF) value based on the output first focal point detection signal and a second focal point detection signal from a virtual second focal point detection pixel corresponding to the first focal point detection pixel; and
generating image data based on an image signal output from the plurality of image pixels and the detected AF value,
wherein a horizontal first focal point detection pixel and a vertical first focal point detection pixel and a vertical second focal point detection pixel corresponding to the horizontal first focal point detection pixel and the vertical first focal point detection pixel are included in a same predetermined area of the predetermined areas.
18. The method of claim 17 , further comprising selecting the virtual second focal point detection pixel based on at least one image pixel adjacent to the first focal point detection pixels.
19. The method of claim 17 ,
wherein a vertical first focal point detection pixel and a horizontal first focal point detection pixel and a horizontal second focal point detection pixel corresponding to the vertical first focal point detection pixel and the horizontal first focal point detection pixel are included in a same predetermined area of the predetermined areas.
20. The method of claim 18 , further comprising generating the second focal point detection signal based on an image signal output from the selected at least one image pixel.
21. The method of claim 20 , wherein the detecting the AF value comprises detecting a phase difference AF value from a phase difference between the first focal point detection signal output from the first focal point detection pixel and the second focal point detection signal generated from the virtual second focal point detection pixel.