TRANSFORMING A DIGITAL IMAGE FROM A LOW DYNAMIC RANGE (LDR) IMAGE TO A HIGH DYNAMIC RANGE (HDR) IMAGE
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Abstract
The invention provides a method for transforming an image from a Low Dynamic Range (LDR) image obtained with a given camera to a High Dynamic Range (HDR) image, the method comprising:
- obtaining the exposure-pixel response curve (21) for said given camera
- converting the LDR image to HSB color space arrays (22), said HSB color space arrays including a Hue array, a Saturation array and a Brigthness array; and
- determining a Radiance array (23, 24) by inverse mapping each pixel in said Brightness array using the inverse of the exposure-pixel response curve (f-1).
82 Citations
31 Claims
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1-11. -11. (canceled)
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12. A method for transforming a digital image from a Low Dynamic Range (LDR) image obtained with a given camera to a High Dynamic Range (HDR) image, comprising:
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obtaining an exposure-pixel response curve for the given camera; converting the LDR image to hue, saturation, and brightness (HSB) color space arrays including a hue array, a saturation array, and a brightness array; and generating a radiance array by inverse mapping each pixel in the brightness array using an inverse of the exposure-pixel response curve. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A computer hardware system configured to transforms a digital image from a Low Dynamic Range (LDR) image obtained with a given camera to a High Dynamic Range (HDR) image, comprising:
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a processor, wherein the processor is configured to perform obtaining an exposure-pixel response curve for the given camera; converting the LDR image to hue, saturation, and brightness (HSB) color space arrays including a hue array, a saturation array, and a brightness array; and generating a radiance array by inverse mapping each pixel in the brightness array using an inverse of the exposure-pixel response curve. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A computer program product comprising a computer usable storage medium having stored therein computer usable program code for transforming a digital image from a Low Dynamic Range (LDR) image obtained with a given camera to a High Dynamic Range (HDR) image, the computer usable program code, which when executed by a computer hardware system, causes the computer hardware system to perform:
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obtaining an exposure-pixel response curve for the given camera; converting the LDR image to hue, saturation, and brightness (HSB) color space arrays including a hue array, a saturation array, and a brightness array; and generating a radiance array by inverse mapping each pixel in the brightness array using an inverse of the exposure-pixel response curve. - View Dependent Claims (27, 28, 29, 30, 31)
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Specification