Magnification and pinching of two-dimensional images

• US 7,715,656 B2
• Filed: 03/15/2005
• Issued: 05/11/2010
• Est. Priority Date: 09/28/2004
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Zhou, Mengyao
• Primary Examiner(s): Mehta; Bhavesh M
• Assistant Examiner(s): Koziol; Stephen R
• Application Number:
  US11/081,400
• Publication Number:
  US 20060078226A1
• Time in Patent Office: 1,883 Days
• Field of Search: 382/298, 382/172, 382/272, 345/650
• US Class Current: 382/298
• CPC Class Codes: G06T 3/047 Fisheye or wide-angle transformations

Abstract

In one embodiment, an embedded device is provided which comprises a region of interest defining mechanism to define a region of interest (ROI) within an image. A transformation mechanism of the embedded device applies a nonlinear magnification or pinching transformation to the region of interest such that magnification or pinching within the region of interest varies from a greater amount at a focal point of the region of interest to a lesser amount at an outer border of the region of interest.

Claims

1. An embedded device, comprising:

a region of interest defining mechanism to define a region of interest within an image; and

a transformation mechanism to apply a nonlinear transformation resulting in magnification or pinching to the region of interest such that magnification or pinching within the region of interest varies from a greater amount at a focal point of the region of interest to a lesser amount at an outer border of the region of interest,

wherein the transformation mechanism applies a same nonlinear transformation function for the nonlinear transformation resulting in magnification or pinching,

wherein the region of interest defining mechanism comprises a circular shape option to define a circular shape region of interest, and

wherein the nonlinear magnification or pinching transformation performed by the transformation mechanism is represented by Equations (1) and (2) below;

2. The embedded device of claim 1, further comprising a user interface coupled to the region of interest defining mechanism.

3. The embedded device of claim 1, further comprising a graphics entity, wherein the region of interest defining mechanism and the transformation mechanism are coupled to the graphics entity.

4. The embedded device of claim 3, further comprising:

a system bus;

a main memory; and

a display screen coupled to the graphics entity;

wherein the main memory and the graphics entity are coupled to the system bus.

5. The embedded device of claim 1, wherein the embedded device is a mobile telephone.

6. The embedded device of claim 5, wherein the mobile telephone includes a digital camera.

7. The embedded device of claim 1, wherein the nonlinear transformation uses only integer arithmetic.

8. The embedded device of claim 1, further comprising a user interface to receive user selections of parameters for the nonlinear magnification or pinching transformation, the parameters comprising a parameter determining whether the transformation produces magnification or pinching and a parameter determining a magnitude of the magnification or pinching.

9. The embedded device of claim 1, wherein when the region of interest defined by the region of interest defining mechanism is smaller in dimension than the image itself, pixels not within the region of interest are not transformed by the transformation mechanism.

10. The embedded device of claim 1, wherein the region of interest defining mechanism comprises an elliptical shape option to define an elliptical shape region of interest.

11. The embedded device of claim 7, wherein the transformation mechanism performs calculations in a predetermined order of calculation so as to avoid integer overflow.

12. The embedded device of claim 1, wherein the transformation mechanism performs the magnification or pinching transformation in real time.

13. The embedded device of claim 1, wherein the transformation mechanism performs the magnification or pinching transformation in only one dimension within the region of interest.

14. The embedded device of claim 4, further comprising a display screen to display from the graphics entity a transformed image including both the region of interest with the magnification or pinching transformation and untransformed portions of the image.

15. The embedded device of claim 14, wherein the transformed image is a facial image with one or more transformed portions.

16. The embedded device of claim 9, wherein the device is adapted to perform two or more transformations on the image, the two or more transformations having the same or different parameters.

17. A computer-readable medium interoperable with a machine to:

define a region of interest within an image; and

apply a nonlinear magnification or pinching transformation to the region of interest such that magnification or pinching within the region of interest varies from a greater amount at a focal point of the region of interest to a lesser amount at an outer border of the region of interest,

wherein a same nonlinear transformation function is applied for the nonlinear transformation resulting in magnification or pinching,

wherein the region of interest is circular in shape, and

wherein the nonlinear magnification or pinching transformation is represented by Equations (1) and (2) below;

18. The computer-readable medium of claim 17, wherein said applying is performed with integer arithmetic.

19. The computer-readable medium of claim 17, wherein the tasks further comprise allowing a user to select, directly or indirectly, parameters for the nonlinear magnification or pinching transformation that determine whether the transformation produces magnification or pinching and a magnitude or power of the magnification or pinching.

20. The computer-readable medium of claim 17, wherein the region of interest within the image is smaller in dimension than the image itself and pixels not within the region of interest are not transformed.

21. The computer-readable medium of claim 17, wherein the region of interest is elliptical in shape.

22. The computer-readable medium of claim 18, further interoperable with a machine to perform said applying in a predetermined order of calculation so as to avoid integer overflow.

23. The computer-readable medium of claim 17, wherein the nonlinear transformation is performed in real time.

24. The computer-readable medium of claim 17, wherein the computer is an embedded device.

25. The computer-readable medium of claim 24, wherein the embedded device is a mobile telephone.

26. The computer-readable medium of claim 25, wherein the mobile telephone includes a digital camera.

27. The computer-readable medium of claim 25, wherein the mobile telephone has an integer microprocessor.

28. A mobile telephone, comprising:

a receiver/transmitter assembly;

a microprocessor;

a region of interest defining mechanism coupled to the microprocessor to define a region of interest within an image; and

a transformation mechanism coupled to the microprocessor to apply a nonlinear magnification or pinching transformation function to the region of interest such that magnification or pinching within the region of interest varies from a greater amount at a focal point of the region of interest to a lesser amount at an outer border of the region of interest,

wherein the transformation mechanism applies a same nonlinear transformation function for the nonlinear magnification or pinching transformation,

wherein the region of interest defining mechanism comprises a circular shape option to define a circular shape region of interest, and

wherein the nonlinear magnification or pinching transformation performed by the transformation mechanism is represented by Equations (1) and (2) below;

29. The mobile telephone of claim 28, wherein the microprocessor is an integer microprocessor.

30. The mobile telephone of claim 28, wherein the transformation mechanism applies the nonlinear transformation using only integer arithmetic.

31. Apparatus comprising:

means for defining a region of interest within an image; and

means for applying a nonlinear magnification or pinching transformation to the region of interest such that magnification or pinching within the region of interest varies from a greater amount at a focal point of the region of interest to a lesser amount at an outer border of the region of interest,

wherein the defining means uses a same nonlinear transformation function for the nonlinear magnification and pinching transformation,

wherein the region of interest is circular, and

wherein the nonlinear magnification or pinching transformation is represented by Equations (1) and (2) below;

32. The system of claim 31, wherein the applying means includes means for facilitating integer arithmetic.

33. The system of claim 31, further comprising means for interfacing with a user coupled to the defining means to define the region of interest.

34. The system of claim 31, wherein the region of interest is elliptical.

35. A method comprising executing in a processor steps of:

defining a region of interest within an image; and

applying a nonlinear magnification or pinching transfonnation to the region of interest such that magnification or pinching within the region of interest varies from a greater amount at a focal point of the region of interest to a lesser amount at an outer border of the region of interest,

wherein a same nonlinear transformation function is applied for the nonlinear transformation resulting in magnification or pinching.

wherein the region of interest is circular in shape, and

wherein the nonlinear magnification or pinching transformation is represented by Equations (1) and (2) below;

36. The method of claim 35, wherein said applying step is perfonned with integer arithmetic.

37. The method of claim 35, wherein the steps further comprise allowing a user to select, directly or indirectly, parameters for the nonlinear magnification or pinching transformation that determine whether the transformation produces magnification or pinching and a magnitude or powerof the magnification or pinching.

38. The method of claim 35, wherein the region of interest within the image is smaller in dimension than the image itself and pixels not within the region of interest are not transformed.

39. The method of claim 35, wherein the region of interest is elliptical in shape.

40. The method of claim 37, further including the step of applying in a predetermined order of calculation so as to avoid integer overflow.

41. The method of claim 35, wherein the nonlinear transformation is performed in real time.