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1. WO2020005233 - PERSPECTIVE TRANSFORMATION OF IMAGES VIA TOUCH SIGNALS

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

CLAIMS

What is claimed is:

1. A calibration device comprising:

a projector to project a first image onto a touch screen, wherein the first image comprises a first set of four corner coordinates; and

a processor to:

perform a first perspective transformation of the first image into a second image for projection onto the touch screen by the projector, wherein the second image comprises a second set of four corner coordinates;

receive at least one touch signal associated with a second set of four corner coordinates associated with the second image from the touch screen; and

perform a second perspective transformation of the second image using the second set of four corner coordinates to resize the second image based on the first set of four corner coordinates.

2. The calibration device of claim 1 , wherein the processor is to correlate the first set of four corner coordinates with the second set of four corner coordinates to perform the second perspective transformation of the second image.

3. The calibration device of claim 1 , wherein the touch screen comprises a touch mat.

4. The calibration device of claim 1 , wherein the touch screen comprises a computer display screen.

5. The calibration device of claim 1 , wherein the first image comprises a first shape, and the second image comprises a second shape that is different from the first shape.

6. The calibration device of claim 1 , wherein the at least one touch signal comprises four touch signals.

7. A computing device comprising:

a memory to store a first set of pixel corner coordinates associated with light that is projected onto a touch screen; and

a processor operatively connected to the memory, wherein the processor is to:

process touch signals input to the touch screen associated with a second set of pixel corner coordinates of the projected light; and

perform a perspective transformation of the projected light using the first set of pixel corner coordinates and the second set of pixel corner coordinates.

8. The computing device of claim 7, comprising a projector to project light comprising an image onto the touch screen.

9. The computing device of claim 8, wherein the processor is to customize the perspective transformation according to the first set of pixel corner coordinates and the second set of pixel corner coordinates.

10. The computing device of claim 7, comprising an interface to input instructions to initiate the processor to receive the touch signals by the touch screen.

1 1. The computing device of claim 7, wherein the touch signals are initiated by the touch screen due to a force applied to the touch screen.

12. A machine-readable storage medium comprising computer-executable instructions that when executed cause a processor of a computing device to: initiate projection of a first image onto a touch screen;

modify a size of the first image to create a second image;

receive touch signals from the touch screen, wherein the touch signals are associated with spatial coordinates of four corners of the second image; calculate a homography matrix using the spatial coordinates of the four corners of the second image; and

calibrate a projection area of the first image based on the spatial coordinates of the four corners of the second image using the homography matrix.

13. The machine-readable storage medium of claim 12, wherein the instructions, when executed, further cause the processor to reduce a size of the first image to create the second image.

14. The machine-readable storage medium of claim 12, wherein the instructions, when executed, further cause the processor to modify a shape of the first image to create the second image.

15. The machine-readable storage medium of claim 12, wherein the instructions, when executed, further cause the processor to enlarge a size of the second image to create a third image.