Method and device for processing a projection image, and projection display system

1. A method for processing a projection image, the method comprising:

obtaining an image to be projected, with a first resolution;

adjusting the resolution of the image to be projected, according to a second resolution supported by a projection display device, to obtain a first image with a third resolution, wherein a number of pixels in a row direction of an image with the third resolution is N times a number of pixels in a row direction of an image with the second resolution, and a number of pixels in a column direction of the image with the third resolution is M times a number of pixels in a column direction of the image with the second resolution, wherein N and M are positive integers;

dividing the first image into pixel blocks respectively in a first pixel block dividing mode and a second pixel block dividing mode, and integrating pixels in the pixel blocks as a result of division, to obtain a second image and a third image with their resolutions being lower than or equal to the second resolution; and

projecting the second image and the third image alternately.

2. The method according to claim 1 , wherein the dividing the first image into pixel blocks respectively in the first pixel block dividing mode and the second pixel block dividing mode, and integrating the pixels in the pixel blocks as a result of division, to obtain the second image and the third image with their resolutions being lower than or equal to the second resolution comprises:

dividing the first image into pixel blocks in the first pixel block dividing mode, and integrating the respective pixel blocks respectively to obtain the second image, wherein one pixel block is integrated into one pixel in the second image; and

dividing the first image into pixel blocks in the second pixel block dividing mode, and integrating the respective pixel blocks respectively to obtain the third image, wherein one pixel block is integrated into one pixel in the third image.

3. The method according to claim 2 , wherein there is a positional correspondence relationship between the pixel blocks into which the first image is divided in the first pixel block dividing mode, and the pixel blocks into which the first image is divided in the second pixel block dividing mode, and there is a same offset between two pixel blocks corresponding in position.

4. The method according to claim 1 , wherein there is a positional correspondence relationship between the pixel blocks into which the first image is divided in the first pixel block dividing mode, and the pixel blocks into which the first image is divided in the second pixel block dividing mode, and there is a same offset between two pixel blocks corresponding in position.

5. The method according to claim 4 , wherein the first pixel block division mode comprises: dividing N*M pixels adjacent to each other in the first image into one pixel block starting with pixels in the first row and the first column in the first image; and

the second pixel block division mode comprises:

dividing N*M pixels adjacent to each other in the first image into one pixel block starting with pixels in the first row and the second column in the first image; or

dividing N*M pixels adjacent to each other in the first image into one pixel block starting with pixels in the second row and the first column in the first image; or

dividing N*M pixels adjacent to each other in the first image into one pixel block starting with pixels in the second row and the second column in the first image.

6. The method according to claim 1 , wherein there are N pixels in the row direction, and M pixels in the column direction in the pixel block obtained in the first pixel block division mode and/or the second pixel block division mode.

7. The method according to claim 1 , wherein the projecting the second image and the third image alternately comprises:

determining a first deflection angle corresponding to the first pixel block division mode, and a second deflection angle corresponding to the second pixel block division mode;

adjusting a deflection angle of the second image according to the first deflection angle; and

adjusting a deflection angle of the third image according to the second deflection angle.

8. The method according to claim 1 , wherein the first resolution is higher than the second resolution, and the third resolution is higher than the first resolution.

9. A device for processing a projection image, the device comprising:

at least one processor; and

a memory communicatively connected with the at least one processor, configured to store at least one processor executable instruction to be executed by the at least one processor to cause the at least one processor to perform the operations of:

obtaining an image to be projected, with a first resolution;

adjusting the resolution of the image to be projected, according to a second resolution supported by a projection display device, to obtain a first image with a third resolution, wherein a number of pixels in a row direction of an image with the third resolution is N times a number of pixels in a row direction of an image with the second resolution, and a number of pixels in a column direction of the image with the third resolution is M times a number of pixels in a column direction of the image with the second resolution, wherein N and M are positive integers;

dividing the first image into pixel blocks respectively in a first pixel block dividing mode and a second pixel block dividing mode, and integrating pixels in the pixel blocks as a result of division, to obtain a second image and a third image with their resolutions being lower than or equal to the second resolution; and

projecting the second image and the third image alternately.

10. The device according to claim 9 , wherein the dividing the first image into pixel blocks respectively in the first pixel block dividing mode and the second pixel block dividing mode, and integrating the pixels in the pixel blocks as a result of division, to obtain the second image and the third image with their resolutions being lower than or equal to the second resolution comprises:

dividing the first image into pixel blocks in the first pixel block dividing mode, and integrating the respective pixel blocks respectively to obtain the second image, wherein one pixel block is integrated into one pixel in the second image; and

dividing the first image into pixel blocks in the second pixel block dividing mode, and integrating the respective pixel blocks respectively to obtain the third image, wherein one pixel block is integrated into one pixel in the third image.

11. The device according to claim 10 , wherein there is a positional correspondence relationship between the pixel blocks into which the first image is divided in the first pixel block dividing mode, and the pixel blocks into which the first image is divided in the second pixel block dividing mode, and there is a same offset between two pixel blocks corresponding in position.

12. The device according to claim 9 , wherein there is a positional correspondence relationship between the pixel blocks into which the first image is divided in the first pixel block dividing mode, and the pixel blocks into which the first image is divided in the second pixel block dividing mode, and there is a same offset between two pixel blocks corresponding in position.

13. The device according to claim 12 , wherein the first pixel block division mode comprises: dividing N*M pixels adjacent to each other in the first image into one pixel block starting with pixels in the first row and the first column in the first image; and

the second pixel block division mode comprises:

dividing N*M pixels adjacent to each other in the first image into one pixel block starting with pixels in the first row and the second column in the first image; or

dividing N*M pixels adjacent to each other in the first image into one pixel block starting with pixels in the second row and the first column in the first image; or

dividing N*M pixels adjacent to each other in the first image into one pixel block starting with pixels in the second row and the second column in the first image.

14. The device according to claim 9 , wherein there are N pixels in the row direction, and M pixels in the column direction in the pixel block obtained in the first pixel block division mode and/or the second pixel block division mode.

15. The device according to claim 9 , wherein the projecting the second image and the third image alternately comprises:

determining a first deflection angle corresponding to the first pixel block division mode, and a second deflection angle corresponding to the second pixel block division mode;

adjusting a deflection angle of the second image according to the first deflection angle; and

adjusting a deflection angle of the third image according to the second deflection angle.

16. The device according to claim 9 , wherein the first resolution is higher than the second resolution, and the third resolution is higher than the first resolution.

17. A projection display system, comprising a light source, a projection display device, a projection image processing device, a light beam angle varying device, and a lens, wherein:

the light beam angle varying device is arranged between the projection display device and the lens, and configured to be controlled by the projection image processing device to be deflected;

the light source provides the projection display device with illumination, and the projection display device projects the image which is output by the light beam angle varying device to the lens for imaging, so that the image is projected onto a projection medium, thus resulting in the projection image; and

the projection image processing device comprises:

at least one processor; and

a memory communicatively connected with the at least one processor, configured to store at least one processor executable instruction to be executed by the at least one processor to cause the at least one processor to perform the operations of:

obtaining an image to be projected, with a first resolution;

adjusting the resolution of the image to be projected, according to a second resolution supported by a projection display device, to obtain a first image with a third resolution, wherein a number of pixels in a row direction of an image with the third resolution is N times a number of pixels in a row direction of an image with the second resolution, and a number of pixels in a column direction of the image with the third resolution is M times a number of pixels in a column direction of the image with the second resolution, wherein N and M are positive integers;

dividing the first image into pixel blocks respectively in a first pixel block dividing mode and a second pixel block dividing mode, and integrating pixels in the pixel blocks as a result of division, to obtain a second image and a third image with their resolutions being lower than or equal to the second resolution; and

projecting the second image and the third image alternately.