Method and a system for optical design and an imaging device using an optical element with optical aberrations

• US 20090002574A1
• Filed: 06/29/2007
• Published: 01/01/2009
• Est. Priority Date: 06/29/2007
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Sorek, Noam, Sade, Sharon
• Application Number:
  US11/819,961
• Publication Number:
  US 20090002574A1
• Time in Patent Office: Days
• US Class Current: 348/784
• CPC Class Codes: G06T 5/006 Geometric correction correction of chromatic aberrations adapted to be used in an image pickup device containing an electronic image sensor H04N23/10; detecting, correcting, reducing or removing artefacts resulting only from the lens unit, e.g. flare, shading, vignetting or "cos4" H04N25/61
• CPC Class Codes: G06T 5/80 Geometric correction
• CPC Class Codes: H04N 23/81 for suppressing or minimising disturbance in the image signal generation
• CPC Class Codes: H04N 25/61 the noise originating only from the lens unit, e.g. flare, shading, vignetting or "cos4"
• CPC Class Codes: H04N 25/611 Correction of chromatic aberration

Abstract

A method for designing an imaging device. The method comprises receiving specification of a final image mapping a three-dimensional environment according to a predefined mapping and an optical unit with an optical aberration. The method further comprises estimating an optical design of the optical unit with the optical aberration. The optical unit is configured for projecting a uncorrected initial image according to the optical aberration. The method further comprises calculating an algorithmic correction for the uncorrected initial image. The algorithmic correction is designed for compensating for the effect of the optical aberration on the uncorrected initial image. The method further comprises manufacturing the imaging device. The manufactured imaging device having the optical design and applying the algorithmic correction on the uncorrected initial image, thereby outputting the final image without the effect produced by said optical aberration and with said predefined mapping.

Claims

1. An imaging apparatus for outputting a final image having a predefined mapping, the imaging apparatus comprising:

an image sensor;

an optical unit having an optical aberration, configured for projecting a uncorrected initial image on said image sensor; and

an optical algorithmic correction module, operatively connected to said image sensor, configured for compensating for the effect of said optical aberration on said uncorrected initial image according to at least one parameter defined according to said optical aberration, thereby allowing the outputting the final image without the effect produced by said optical aberration and with said predefined mapping.

2. The imaging apparatus of claim 1, wherein said uncorrected initial image comprises first and second areas, each said first and second area has a different predefined resolution.

3. The imaging apparatus of claim 2, wherein said optical algorithmic correction module is configured for calculating an even resolution for said first and second areas according to said different predefined resolution, said final image being generated according to said even resolution.

4. The imaging apparatus of claim 3, wherein said uncorrected initial image comprises red, green, and blue projections, said calculating comprises using a first resolution in said first area for compensating for a second resolution in said second area, said first resolution being higher than said second resolution in at least one of said projections.

5. The imaging apparatus of claim 1, wherein said compensating being performed by using a weight calculated for a plurality of different projections.

6. The imaging apparatus of claim 5, wherein said plurality of different projections comprises a projection from a member of the following group:

a rectilinear object, a cylindrical object, a multi-planar object, and an ellipsoidal object.

7. The imaging apparatus of claim 3, wherein said optical aberration comprises a monochromatic aberration.

8. The imaging apparatus of claim 7, wherein said monochromatic aberration comprises a member of the following group:

a tilt aberration, a defocus aberration, a spherical aberration, a coma aberration, an astigmatism aberration, a curvature of field aberration, an image distortion aberration, and a reflecting surface aberration.

9. The imaging apparatus of claim 1, wherein said optical aberration comprises a chromatic aberration.

10. The imaging apparatus of claim 9, wherein said chromatic aberration comprises a member of the following group:

a longitudinal chromatic aberration and a transverse chromatic aberration.

11. The imaging apparatus of claim 9, said optical aberration having an image distortion aberration below 2%.

12. The imaging apparatus of claim 1, wherein said optic unit is an assembly having at least one optical element, said at least one optical element comprises a member of the following group:

lenses, diffractive lenses, prisms, and mirrors.

13. The imaging apparatus of claim 12, wherein said optical aberration is related to said assembly having at least one optical element.

14. The imaging apparatus of claim 1, wherein said optical element is designed for providing wide field of view.

15. The imaging apparatus of claim 1, wherein said imaging apparatus is a member of the following group a laptop, a webcam, a mobile telephone, a personal digital assistant (PDA), a display, and a head mounted display (HMD).

16. An imaging apparatus for outputting a final image having a predefined mapping, the imaging apparatus comprising:

an image sensor;

an optical unit having an image distortion aberration above 5%, configured for projecting a uncorrected initial image on said image sensor; and

an optical algorithmic correction module, operatively connected to said image sensor, configured for compensating for the effect of said optical aberration on said uncorrected initial image, thereby allowing the outputting the final image without the effect of said optical aberration and with said predefined mapping.

17. An imaging apparatus for outputting a final image having a predefined mapping, the imaging apparatus comprising:

an image sensor;

an optical unit having a chromatic optical aberration, configured for projecting a uncorrected initial image with lateral color wider than an Airy disc of said image sensor; and

an optical algorithmic correction module, operatively connected to said image sensor, configured for compensating for the effect of said optical aberration on said uncorrected initial image, thereby allowing the outputting the final image without the effect of said optical aberration and with said predefined mapping.

18. An imaging apparatus for outputting a final image having a predefined mapping, the imaging apparatus comprising:

an image sensor;

an optical unit having a chromatic optical aberration, configured for projecting a uncorrected initial image with a first area and a second area on said image sensor, said first and second areas having different resolutions; and

an optical algorithmic correction module, operatively connected to said image sensor, configured for compensating for the effect of said optical aberration on said uncorrected initial image, thereby allowing the outputting the final image without the effect of said optical aberration and with said predefined mapping.

19. The imaging apparatus of claim 18, wherein said compensating comprises using information in said first area for compensating for the effect of said optical aberration on said second area.

20. The imaging apparatus of claim 18, wherein said first area has higher resolution with respect to the projection of one color wavelength than the respective resolution of said second area.

21. The imaging apparatus of claim 20, wherein said higher resolution is a modulation transfer function (MTF) value of at least 45% contrast at a half Nyquist frequency at the lower of said sensor and said optics unit.

22. A method for designing an imaging device, the method comprising:

a) receiving specification of a final image mapping a three-dimensional environment according to a predefined mapping and an optical unit with an optical aberration;

b) estimating an optical design of said optical unit with said optical aberration, said optical unit being configured for projecting a uncorrected initial image according to said optical aberration;

c) calculating an algorithmic correction for said uncorrected initial image, said algorithmic correction being configured for compensating for the effect of said optical aberration on said uncorrected initial image; and

d) manufacturing the imaging device, the manufactured imaging device having said optical design and applying said algorithmic correction on said uncorrected initial image, thereby outputting said final image.

23. The method of claim 22, wherein said specification defines first and second areas in said uncorrected initial image, each said first and second area has a different resolution.

24. The method of claim 22, wherein said specification defines a plurality of areas in said uncorrected initial image, each said plurality of areas has a different resolution.

25. The method of claim 23, wherein said designing comprises designing said optical unit to project said first and second areas in said uncorrected initial image.

26. The method of claim 23, further comprising a step d) of calculating an even resolution for said first and second areas, said algorithmic correction being configured for compensating for said different resolution according to said even resolution.

27. The method of claim 26, wherein said first and second areas are defined for a plurality of monochromatic light beams, each said monochromatic light beam being centered on a different wavelength, said calculating, each said first and second area has a high resolution in one of said definitions.

28. The method of claim 26, wherein said optical aberration comprises a monochromatic aberration.

29. The method of claim 26, wherein said optical aberration comprises a chromatic aberration.

30. The method of claim 29, further comprising a step c1) between step c) and d) of iteratively repeating said steps b) and c) until an image generated by applying said algorithmic correction on said uncorrected initial image comply with said specification.

31. The method of claim 29, wherein said optical aberration is defined by at least one parameter, said designing comprising the following steps:

a) defining said at least one parameter as respective target values in a merit function; and

b) identifying at least one temporary evaluated value that provides an optimal value of said merit function;

wherein said optical design is based on said at least one temporary evaluated value.

32. The method of claim 29, wherein uncorrected initial image comprises an image distortion produced by said optical aberration, said algorithmic correction being calculated using a calibration grid which projects a calibration image according to said image distortion.

33. The method of claim 22, wherein said predefined mapping maps at least one section of said three-dimensional environment into at least one section of said final image.

34. The method of claim 33, wherein each said at least one section of said three-dimensional environment is mapped into a respective said at least one section of said final image according to at least one member of the following group:

a planer mapping, a multi-planer mapping, a cylindrical mapping, and a spherical mapping.

35. The method of claim 22, wherein said predefined mapping comprises a member of the following group:

a planer mapping, a multi-planer mapping, a cylindrical mapping, and a spherical mapping.

36. The method of claim 29, wherein said specification defines said optical aberration.

37. A system for designing an imaging device, the system comprising:

an input module configured for receiving a specification of a final image mapping a three-dimensional environment according to a predefined mapping an optical unit having an optical aberration;

an optical design module configured for providing an optical design of said optical unit having said optical aberration, said optical unit being configured for projecting a distorted initial image;

an algorithmic correction module configured for generating an algorithmic correction for compensating for the effect of said optical aberration on said image, said algorithmic correction being defined according to said predefined mapping and said optical aberration; and

an output module configured for outputting said optical design and said algorithmic correction, thereby allowing the manufacturing of an imaging device configured for outputting said final image.

38. The system of claim 37, wherein said specification defines first and second areas in said image, each said first and second area has a different resolution.

39. The system of claim 38, wherein said optical design defines said optical unit to project said first and second areas.

40. The system of claim 39, wherein said algorithmic correction module is configured for generating an algorithmic correction that allows the generation of an image with an even resolution, said generating being performed according to said first and second areas.