Display device and method for processing video signal
A display device, configured to receive a video signal including a plurality of frames having an odd field and an even field, including a processor and a display module. The processor performs the following steps: respectively determining whether the odd fields and the even fields of each current frame and its previous frame are similar; generating a first pattern, a second pattern, a third pattern, or a fourth pattern corresponding to the current frame according to a determining result; accumulating the first patterns, the second patterns, the third patterns, and the fourth patterns in a first cycle; determining whether the video signal is a video converted from film according to the accumulations; generating output frames according to the pattern of each current frame when the video signal is the video converted from film. The display module displays the output frames by progressive scanning.
1. A display device, configured to receive a video signal, wherein the video signal comprises a plurality of frames, and each frame has an odd field and an even field, the display device comprising:
a processor, configured to perform the following steps:
respectively determining whether the odd fields of each current frame and its previous frame are similar and the even fields of each current frame and its previous frame are similar;
generating one of a plurality of patterns corresponding to each current frame according to a determining result by determining whether the odd fields of each current frame and its previous frame are similar and the even fields of each current frame and its previous frame are similar, wherein the patterns at least comprise a first pattern, a second pattern, a third pattern, and a fourth pattern;
respectively accumulating the first patterns, the second patterns, the third patterns, and the fourth patterns in a first cycle;
determining whether the video signal is a video converted from film according to a number of the first patterns and the second patterns, or a number of the fourth patterns;
generating a plurality of output frames by processing the previous frame, the current frame and a subsequent frame according to the pattern of each current frame when the video signal is a video converted from film; and
a display module, configured to display the output frames by progressive scanning.
2. The display device as claimed in claim 1 , wherein:
the processor generates the first pattern corresponding to the current frame when the odd fields are similar and the even fields are different;
the processor generates the second pattern corresponding to the current frame when the odd fields are different and the even fields are similar;
the processor generates the third pattern corresponding to the current frame when the odd fields and the even fields are both different, and the current frame appears after a frame corresponding to the first pattern; and
the processor generates the fourth pattern corresponding to the current frame when the odd fields and the even fields are both different, and the current frame appears after a frame corresponding to the second pattern.
3. The display device as claimed in claim 1 , wherein when a total number of the first patterns and the second patterns is greater than or equal to a first predetermined value in the first cycle, the processor determines that the video signal is the video converted from film.
4. The display device as claimed in claim 1 , wherein when the number of the fourth patterns is greater than a second predetermined value in the first cycle, the processor determines the video signal is the video converted from film.
5. The display device as claimed in claim 1 , wherein when the pattern is the first pattern or the third pattern, the processor executes a first processing program, the first processing program means the processor generates a first frame of the output frames according to the even field of the previous frame and the odd field of the current frame, and generates a second frame of the output frames according to the even field of the current frame and the odd field of the subsequent frame.
6. The display device as claimed in claim 1 , wherein when the pattern is the second pattern or the fourth pattern, the processor executes a second processing program, the processing program means the processor generates a first frame and a second frame of the output frames according to the odd field and the even field of the current frame.
7. The display device as claimed in claim 1 , wherein when a total number of the first patterns and the second patterns is greater than a first threshold, or the number of the fourth patterns is greater than a second threshold, the processor determines that the video signal is the video converted from film.
8. The display device as claimed in claim 1 , wherein when a total number of the first patterns and the second patterns is less than or equal to a first threshold, and the number of the fourth patterns is less than or equal to the second threshold, the processor re-accumulates the first patterns, the second patterns, the third patterns and the fourth patterns.
9. The display device as claimed in claim 1 , wherein when the patterns generated by the current frame do not comprise the first pattern or the second pattern for N consecutive patterns, the processor re-accumulates the first patterns, the second patterns, the third patterns and the fourth patterns.
10. The display device as claimed in claim 1 , wherein the processor further performs the following steps:
when in a second cycle that the odd fields of the current frame and the previous frame are different, the even fields of the current frame and the previous frame are also different, and the odd field and the even field of the current frame are similar, the processor generates a fifth pattern corresponding to the current frame; and
when in the second cycle that a number of the fifth patterns is greater than a third predetermined value, the processor executes a second processing program, the second processing program means the processor generates a first frame and a second frame of the output frames according to the odd field and the even field of the current frame.
11. A method for processing a video signal, adapted to a display device, comprising:
generating a video signal, wherein the video signal comprises a plurality of frames, and each frame has an odd field and an even field;
respectively determining whether the odd fields of each current frame and its previous frame are similar and the even fields of each current frame and its previous frame are similar;
generating one of a plurality of patterns corresponding to each current frame according to a determining result by determining whether the odd fields of each current frame and its previous frame are similar and the even fields of each current frame and its previous frame are similar, wherein the patterns at least comprise a first pattern, a second pattern, a third pattern, and a fourth pattern;
respectively accumulating the first patterns, the second patterns, the third patterns, and the fourth patterns in a first cycle;
determining whether the video signal is a video converted from film according to a number of the first patterns and the second patterns, or a number of the fourth patterns;
generating a plurality of output frames by processing the previous frame, the current frame and a subsequent frame according to the pattern of each current frame when the video signal is a video converted from film; and
displaying the output frames by progressive scanning.
12. The method as claimed in claim 11 , wherein the step for generating one of a plurality of patterns corresponding to each current frame further comprises:
generating the first pattern corresponding to the current frame when the odd fields are similar and the even fields are different;
generating the second pattern corresponding to the current frame when the odd fields are different and the even fields are similar;
generating the third pattern corresponding to the current frame when the odd fields and the even fields are both different, and the current frame appears after a frame corresponding to the first pattern; and
generating the fourth pattern corresponding to the current frame when the odd fields and the even fields are both different, and the current frame appears after a frame corresponding to the second pattern.
13. The method as claimed in claim 11 , wherein when a total number of the first patterns and the second patterns is greater than or equal to a first predetermined value in the first cycle, determining that the video signal is the video converted from film.
14. The method as claimed in claim 11 , wherein when the number of the fourth patterns is greater than a second predetermined value in the first cycle, the processor determines the video signal is the video converted from film.
15. The method as claimed in claim 11 , wherein the step for generating a plurality of output frames by processing the previous frame, the current frame and a subsequent frame further comprises:
when the pattern is the first pattern or the third pattern, executing a first processing program, the first processing program means a first frame of the output frames is generated according to the even field of the previous frame and the odd field of the current frame, and a second frame of the output frames is generated according to the even field of the current frame and the odd field of the subsequent frame.
16. The method as claimed in claim 11 , wherein the step for generating a plurality of output frames by processing the previous frame, the current frame and a subsequent frame further comprises:
when the pattern is the second pattern or the fourth pattern, executing a second processing program, the processing program means a first frame and a second frame of the output frames are generated according to the odd field and the even field of the current frame.
17. The method as claimed in claim 11 , wherein when a total number of the first patterns and the second patterns is greater than a first threshold, or the number of the fourth patterns is greater than a second threshold, determining that the video signal is the video converted from film.
18. The method as claimed in claim 11 , wherein when a total number of the first patterns and the second patterns is less than or equal to a first threshold, and the number of the fourth patterns is less than or equal to the second threshold, re-accumulating the first patterns, the second patterns, the third patterns and the fourth patterns.
19. The method as claimed in claim 11 , wherein when the patterns generated by the current frame do not comprise the first pattern or the second pattern for N consecutive patterns, re-accumulating the first patterns, the second patterns, the third patterns and the fourth patterns.
20. The method as claimed in claim 11 , wherein the steps further comprise:
when in a second cycle that the odd fields of the current frame and the previous frame are different, the even fields of the current frame and the previous frame are also different, and the odd field and the even field of the current frame are similar, generating a fifth pattern corresponding to the current frame; and
when in the second cycle that a number of fifth patterns is greater than a third predetermined value, executing a second processing program, the second processing program means a first frame and a second frame of the output frames are generated according to the odd field and the even field of the current frame.