Technique for adaptive de-blocking of block-based film grain patterns
View Patent ↗Reduction in the blockiness of a simulated film grain block can be achieved either by the use of adaptive downscaling or adaptive deblocking filtering to adjust the intensity of the pixels at the block edge in accordance with at least one film grain block parameter, such as film grain size, intensity and texture. Performing such adaptive downscaling or adaptive deblocking filtering achieves improved performance at lower computational cost by avoiding modification of film grain block pixels in lesser affected areas.
1. A method for reducing blockiness of at least one film grain block for blending with an image, comprising the steps of:
establishing at least one parameter associated at least in part with a characteristic of film grain in the block, which when blended with an image, simulates motion picture film; and
reducing the film grain blockiness in accordance with the at least one parameter.
2. The method according to claim 1 wherein the step of reducing the film grain blockiness further comprises the step of downscaling the film grain block along the at least one edge.
3. The method according claim 2 further comprising the step of downscaling the film grain block along all edges.
4. The method according to claim 1 wherein the step of reducing the film grain blockiness further comprises the step of deblocking filtering the film grain block across the at least one edge.
5. The method according to claim 4 wherein the step of reducing the film grain blockiness further comprises the step of deblocking filtering the film grain block across all edges.
6. The method according to claim 1 wherein the step of establishing the at least one parameter further comprises the step of establishing film grain size.
7. The method according to claim 1 wherein the step of establishing the at least one parameter further comprises the step of establishing film grain intensity.
8. The method according to claim 1 wherein the step of establishing the at least one parameter further comprises the step of establishing film grain texture.
9. The method according to claim 1 wherein the step of establishing the at least one parameter further comprises the step of establishing at least one of film grain size, intensity and texture, and establishing at least one image characteristic.
10. The method according to claim 1 further comprising the step of reducing the film grain blockiness differently in different rows in the block.
11. The method according to claim 1 further comprising the step of reducing the film grain blockiness differently in different columns in the block.
12. The method according to claim 1 further comprising the step of reducing the film grain blockiness at least in part in accordance with at least one characteristic of an adjacent block.
13. The method according to claim 1 further comprising the step of reducing the film grain blockiness at least in part in accordance with at least one characteristic of an image receiving the grain.
14. Apparatus for reducing blockiness of at least one film grain block for blending with an image to simulate motion picture film, comprising:
means for establishing at least one parameter associated with characteristic of the film grain in the block; and
means for reducing the film grain blockiness in accordance with the at least one parameter.
15. The apparatus according to claim 14 wherein the means for reducing the film grain blockiness further comprises means for downscaling the film grain block along the at least one edge.
16. The apparatus according claim 15 wherein the means for downscaling the film grain block downscales along all block edges.
17. The apparatus according to claim 14 wherein the means for reducing the film grain blockiness further comprises means for deblocking filtering the film grain block across the at least one edge.
18. The apparatus according to claim 17 wherein the deblocking filtering means deblocking filters the film grain block across all edges.
19. The apparatus according to claim 14 wherein the means for establishing the at least one parameter further comprises means for establishing film grain size.
20. The apparatus according to claim 14 wherein the means for establishing at least one parameter further comprises means for establishing film grain intensity.
21. The apparatus according to claim 14 wherein the means for establishing the least one parameter further comprises the means for establishing film grain texture.
22. The apparatus according to claim 14 wherein the means for establishing the least one parameter further comprises means for establishing at least one of film grain size, intensity and texture, and establishing at least one image characteristic.