Video signal processing device, video signal processing method, and camera device
The present technology allows for easily checking whether a moving part is in focus. A video signal at a first frame rate is acquired from a captured video signal at a second frame rate N times higher than the first frame rate. N is an integer larger than or equal to two. Each frame of the captured video signal at the second frame rate is filtered in horizontal and vertical high pass filter processes so that an edge signal is detected. An edge signal corresponding to each frame at the first frame rate is generated in accordance with the edge signal of each frame. Synthesizing the generated edge signal onto the video signal at the first frame rate provides a video signal for a viewfinder display.
1. A video signal processing device, comprising:
at least one processor configured to:
generate a converted image signal having a first frame rate, wherein the converted image signal is generated based on an input image signal having a second frame rate higher than the first frame rate;
detect a first edge signal corresponding to each frame in the input image signal;
detect a second edge signal corresponding to each frame of the converted image signal having the first frame rate; and
generate an output image signal based on the detected first edge signal and the detected second edge signal.
2. The video signal processing device according to claim 1 , wherein the at least one processor is further configured to:
determine a difference absolute value between the first edge signal of a first frame of the input image signal and a second frame of the input image signal, wherein the second frame is a frame adjacent to the first frame; and
generate a third edge signal of a frame of the input image signal based on the difference absolute value of a plurality of frames of the input image signal.
3. The video signal processing device according to claim 1 , wherein the at least one processor is further configured to generate a third edge signal of a frame of the input image signal based on a plurality of first edge signals of a plurality of frames of the input image signal.
4. The video signal processing device according to claim 1 , wherein the at least one processor is further configured to:
convert the output image signal of each frame of the input image signal into a color signal of a determined color; and
output the color signal.
5. The video signal processing device according to claim 1 , wherein the second frame rate is higher than or equal to 200 Hz.
6. A video signal processing method, comprising:
generating a converted image signal having a first frame rate, wherein the converted image signal is generated based on an input image signal having a second frame rate higher than the first frame rate;
detecting a first edge signal corresponding to each frame in the input image signal;
detecting a second edge signal corresponding to each frame of the converted image signal; and
generating an output image signal based on the detected first edge signal and the detected second edge signal.
7. The video signal processing method according to claim 6 , further comprising:
determining a difference absolute value between the first edge signal of a first frame of the input image signal and a second frame of the input image signal, wherein the second frame is a frame adjacent to the first frame; and
generating a third edge signal of a frame of the input image signal based on the difference absolute value of a plurality of frames of the input image signal.
8. The video signal processing method according to claim 6 , further comprising generating a third edge signal of a frame of the input image signal based on a plurality of first edge signals of a plurality of frames of the input image signal.
9. The video signal processing method according to claim 6 , further comprising:
converting the output image signal of each frame of the input image signal into a color signal of a determined color; and
outputting the color signal.
10. A camera device, comprising:
at least one processor configured to:
generate a first video signal at a first frame rate from a captured video signal at a second frame rate, wherein the second frame rate is higher than the first frame rate;
detect a first edge signal corresponding to each frame in the captured video signal;
detect a second edge signal corresponding to each frame of the first video signal;
generate an output image signal based on the detected first edge signal and the second edge signal;
synthesize the second edge signal onto the first video signal at the first frame rate; and
generate a second video signal at the first frame rate for a viewfinder display based on the synthesized second edge signal.
11. The camera device according to claim 10 , wherein the at least one processor is further configured to:
determine a difference absolute value between the first edge signal of a first frame of the captured video signal and a second frame of the captured video signal, wherein the second frame is a frame adjacent to the first frame; and
generate a third edge signal of a frame of the captured video signal from the difference absolute value of a plurality of frames of the captured video signal.
12. The camera device according to claim 10 , wherein the at least one processor is further configured to generate a third edge signal of a frame of the captured video signal based on a plurality of first edge signals of a plurality of frames of the captured video signal.
13. The camera device according to claim 10 , wherein the at least one processor is further configured to:
convert the output image signal of each frame of the captured video signal into a color signal of a determined color;
synthesize the color signal of the determined color at the first frame rate;
generate the second video signal at the first frame rate for the viewfinder display based on the synthesized color signal of the determined color; and
output the color signal onto the second video signal at the first frame rate.
14. The camera device according to claim 13 , wherein the at least one processor is further configured to determine the determined color based on a selection signal received from a user operation.
15. The camera device according to claim 10 , wherein the second frame rate is higher than or equal to 200 Hz.
16. A video signal processing method, comprising:
generating a first video signal at a first frame rate from a captured video signal at a second frame rate, wherein the second frame rate is higher than the first frame rate;
detecting a first edge signal corresponding to each frame in the captured video signal;
detecting a second edge signal corresponding to each frame of the first video signal;
generating an output image signal based on the detected first edge signal and the second edge signal;
synthesizing the second edge signal onto the first video signal at the first frame rate; and
generating a second video signal at the first frame rate for a viewfinder display based on the synthesized second edge signal.
17. The video signal processing method according to claim 16 , further comprising:
determining a difference absolute value between the first edge signal of a first frame of the captured video signal and a second frame of the captured video signal, wherein the second frame is a frame adjacent to the first frame; and
generating a third edge signal of a frame of the captured video signal from the difference absolute value of a plurality of frames of the captured video signal.
18. The video signal processing method according to claim 16 , further comprising:
converting the output image signal of each frame of the captured video signal into a color signal of a determined color;
synthesizing the color signal of the determined color at the first frame rate;
generating the second video signal at the first frame rate for the viewfinder display based on the synthesized color signal of the determined color; and
outputting the color signal onto the second video signal at the first frame rate.
19. A camera device, comprising:
at least one processor configured to:
generate a first video signal at a first frame rate from a captured video signal at a second frame rate, wherein the second frame rate is higher than the first frame rate;
detect a first edge signal corresponding to each frame in the captured video signal;
generate an output image signal based on the detected first edge signal and the first video signal;
process each frame in the first video signal at the first frame rate to detect a second edge signal corresponding to each frame of the first video signal at the first frame rate;
synthesize the second edge signal onto the first video signal at the first frame rate; and
output one of:
a second video signal at the first frame rate for a viewfinder display based on the synthesized second edge signal,
the second edge signal, or
a third edge signal generated based on a combination of the first edge signal and the second edge signal onto the first video signal at the first frame rate.
20. The camera device according to claim 19 , wherein the at least one processor is further configured to selectively output one of the first edge signal, the second edge signal, or the third edge signal based on a selection signal received from a user operation.