Color wide dynamic range camera

• US 5,247,366 A
• Filed: 11/20/1991
• Issued: 09/21/1993
• Est. Priority Date: 08/02/1989
• Status: Expired due to Fees

• Current Assignee: I Light, LLC
• Original Assignee: I Light, LLC
• Inventors: Sorek, Noam, Genossar, Tamar, Kligler, Daniel J., Zinaty, Ofra, Zeevi, Yehoshua Y., Ginosar, Ran
• Primary Examiner(s): Peng, John K.
• Application Number:
  US07/795,350
• Time in Patent Office: 671 Days
• Field of Search: 358/209, 358/909, 358/166, 358/228
• US Class Current: 348/256
• CPC Class Codes: H04N 23/70 Circuitry for compensating brightness variation in the scene

Abstract

The apparatus is a color wide dynamic range video camera which takes a plurality of images at different exposure levels, applies neighborhood processing to each of the images, and then combines the components into a final image.

Claims

1. A color wide dynamic range video imaging apparatus comprising:

sensor means for providing a plurality of color video images of a scene at different exposure levels;

means for dividing each color video image into components; and

means for processing said components of each said plurality of color video images to produce a combined color video image including image information from said components by processing at least one of said components wherein said means for processing operates by applying neighborhood processing means to one or more of said components.

2. The color wide dynamic range video imaging apparatus of claim 1 wherein said means for processing includes a first means for transforming each of said plurality of color video images into an achromatic component and two chromatic components;

neighborhood processing means for each of said achromatic and chromatic components thereby generating a processed achromatic component and two processed chromatic components; and

a second means for transforming said processed achromatic and chromatic components into at least three chromatic output components of each of said plurality of video images.

3. The color wide dynamic range video image apparatus of claim 2 wherein said first means for transforming uses a first matrix multiplier;

wherein said second means for transforming uses a second matrix multiplier; and

wherein said second matrix multiplier is an inverse of said first matrix multiplier.

4. The color wide dynamic range video image apparatus of claim 3 wherein said first matrix multiplier includes:

a first row with elements substantially equal to 0.2684, 0.6749, and 0.0567;

a second row with elements substantially equal to 0.6762, -0.5766, and -0.0997; and

a third row with elements substantially equal to 0.1604, 0.2434, and -0.4038.

5. The color wide dynamic range video apparatus of claim 2 including one of said means for processing for each of said plurality of video images, and adder means for combining output of each of said means for processing.

6. The color wide dynamic range video apparatus of claim 5 further including histogram means for enhancing output of said apparatus.

7. The color wide dynamic range video imaging apparatus of claim 1 wherein said sensor means comprises a two dimensional sensor array.

8. The color wide dynamic range video imaging apparatus of claim 1 wherein said sensor means comprises a linear sensor array.

9. A color wide dynamic range video imaging apparatus comprising:

sensor means for providing a plurality of color video images of a scene at different exposure levels;

means for dividing each color video image into components; and

means for processing said components of each of said plurality of color video images to produce a combined color video image including image information from said components of each of said plurality of color video images by processing at least one of said components of each of said plurality of color video images, wherein said means for processing comprises a first means for transforming each of said plurality of color video image components into an achromatic component and two chromatic components;

neighborhood processing means for said achromatic component to generate a processed achromatic component;

gain multiplying means for applying a gain to said chromatic components to generate amplified chromatic components; and

a second means for transforming said processed achromatic component and said amplified chromatic components into at least three chromatic output components of each of said plurality of video images.

10. The color wide dynamic range video apparatus of claim 9 wherein said gain multiplying means comprises look-up tables.

11. The color wide dynamic range video apparatus of claim 9 including one of said means for processing for each of said plurality of video images, and adder means for combining output of each of said means for processing.

12. The color wide dynamic range video apparatus of claim 11 further including histogram means for enhancing output of said apparatus.

13. The color wide dynamic range video imaging apparatus of claim 9 wherein said sensor means comprises a two dimensional sensor array.

14. The color wide dynamic range video imaging apparatus of claim 9 wherein said sensor means comprises a linear sensor array.

15. A color wide dynamic range video imaging apparatus comprising:

sensor means for providing a plurality of chromatic color video images of a scene at different exposure levels;

means for dividing each color video image into chromatic components; and

means for processing said components of each of said plurality of color video images to produce a combined color video image including image information from said components of each of said plurality of color video images by processing at least one of said components of each of said plurality of color video images,

wherein said means for processing comprises a means for receiving each of said chromatic components and generating an intensity signal therefrom;

means for processing said intensity signal;

means for combining said processed intensity signal into aid chromatic components;

memory means for storing previous information for each of said chromatic components;

means for combining said previous information for each of said chromatic components into said chromatic components; and

output look-up table means for transforming said chromatic components.

16. The color wide dynamic range video imaging apparatus of claim 15 further including second processing means receiving an output of said memory means.

17. The color wide dynamic range video imaging apparatus of claim 15 wherein said means for processing further includes an exposure-dependent look-up table between said means for combining said processed intensity signal into said chromatic components and said memory means.

18. The color wide dynamic range video imaging apparatus of claim 17 wherein said means for processing further includes a non-linear look-up table applied to said intensity signal from an image taken at a higher exposure level.

19. The color wide dynamic range video imaging apparatus of claim 18 wherein exposures are taken of different fields and are thereafter combined.

20. The color wide dynamic range video imaging apparatus of claim 19 wherein said output look-up table means includes gamma correction means and histogram correction means.

21. The color wide dynamic range video imaging apparatus of claim 15 wherein said sensor means comprises a two dimensional sensor array.

22. The color wide dynamic range video imaging apparatus of claim 15 wherein said sensor means comprises a linear sensor array.

23. A color wide dynamic range video imaging apparatus comprising:

sensor means for providing a plurality of chromatic color video images of a scene at different exposure levels;

means for dividing each color video image into chromatic components; and

means for processing said components of each of said plurality of color video images to produce a combined color video image including image information from said components of each of said plurality of color video images by processing at least one of said components of each of said plurality of color video images,

wherein said means for processing comprises for each of said plurality color video images;

means for calculating a luminance component from said chromatic components;

means for calculating a convolved luminance component from said luminance component;

means for calculating a weighing factor from at least said luminance component; and

means for multiplying said weighing factor times said chromatic components.

24. The color wide dynamic range video imaging apparatus of claim 23 wherein said means for calculating divides said convolved luminance component by said luminance component.

25. The color wide dynamic range video imaging apparatus of claim 23 wherein said sensor means comprises a two dimensional sensor array.

26. The color wide dynamic range video imaging apparatus of claim 23 wherein said sensor means comprises a linear sensor array.

27. A color wide dynamic range video imaging apparatus comprising:

sensor means for providing a plurality of color video images of a scene at different exposure levels;

means for dividing each color video image into chromatic components; and

means for processing said components of each of said plurality of color video images to produce a combined color video image including image information from said components of each of said plurality of color video images by processing at least one of said components of each of said plurality of color video images,

wherein said means for processing comprises for each of said plurality color video images;

means for calculating a luminance component from said chromatic components;

means for dividing said chromatic components by said luminance component to produce normalized chromatic signals;

means for calculating a processed luminance component from said luminance component;

means for calculating a weighing factor from at least said luminance component of each of said plurality of color video images; and

means for multiplying said weighing factor times said normalized chromatic components.

28. The color wide dynamic range video imaging apparatus of claim 27 further including a means for adding said processed luminance components from each of said plurality of color video images and multiplying an output therefrom times said combined color video image.

29. The color wide dynamic range video imaging apparatus of claim 27 wherein said sensor means comprises a two dimensional sensor array.

30. The color wide dynamic range video imaging apparatus of claim 27 wherein said sensor means comprises a linear sensor array.

31. A color wide dynamic range video imaging apparatus comprising:

sensor means for providing a plurality of color video images of a scene at different exposure levels;

means for dividing each color video image into components; and

means for processing said components of each of said plurality of color video images to produce a combined color video image including image information from said components of each of said plurality of color video images by processing at least one of said components of each of said plurality of color video images, wherein said means for processing comprises a first means for transforming each of said plurality of color video image components into an achromatic component and two chromatic components;

neighborhood processing means for each of said achromatic and chromatic components to generate a processed achromatic component and two processed chromatic components; and

a second means for transforming said processed achromatic and chromatic components into at least three chromatic output components of each of said plurality of video images.

32. The color wide dynamic range video imaging apparatus of claim 31 wherein said sensor means comprises a two dimensional sensor array.

33. The color wide dynamic range video imaging apparatus of claim 31 wherein said sensor means comprises a linear sensor array.