Method and apparatus for performing tone scale modifications on a sparsely sampled extended dynamic range digital image
AssigneeEastman Kodak Company
InventorsAndrew C. Gallagher, Edward B. Gindele
Life of this patent
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Abstract
A method of generating a tone scale function for a sparsely sampled extended dynamic range digital image, includes the steps of: providing a sparsely sampled extended dynamic range image sensing device having fast photosites with a predetermined response to light exposure interspersed with slow photosites with a slower response to the same light exposure; using the image sensing device to produce a sparsely sampled high resolution digital image having fast pixel values produced by the fast photosites and slow pixel values produced by the slow photosites; and generating the tone scale function using only slow pixel values from the sparsely sampled high resolution digital image.
Claims78
A method of generating a tone scale function for a sparsely sampled extended dynamic range digital image, comprising the steps of:
- a) providing a sparsely sampled extended dynamic range image sensing device having fast photosites with a predetermined response to light exposure interspersed with slow photosites with a slower response to the same light exposure;
- b) using the image sensing device to produce a sparsely sampled high resolution digital image having fast pixel values produced by the fast photosites and slow pixel values produced by the slow photosites;
- and
- c) generating the tone scale function using only slow pixel values from the sparsely sampled high resolution digital image.
A method of generating a tone scale function for a sparsely sampled extended dynamic range digital image, comprising the steps of:
- a) providing a sparsely sampled extended dynamic range image sensing device having fast photosites with a predetermined response to light exposure interspersed with slow photosites with a slower response to the same light exposure;
- b) using the image sensing device to produce a sparsely sampled high resolution digital image having fast pixel values produced by the fast photosites and slow pixel values produced by the slow photosites;
- c) analyzing the fast pixel values for saturation;
- and
- d) if saturation is present in the fast pixel values, generating the tone scale function using only slow pixel values from the sparsely sampled high resolution digital image.
A system for generating a tone scale function for a sparsely sampled extended dynamic range digital image, comprising:
- a) a sparsely sampled extended dynamic range image sensing device having fast photosites with a predetermined response to light exposure interspersed with slow photosites with a slower response to the same light exposure for producing a sparsely sampled high resolution digital image having fast pixel values produced by the fast photosites and slow pixel values produced by the slow photosites;
- and
- b) means for generating the tone scale function using only slow pixel values from the sparsely sampled high resolution digital image.
A system for generating a tone scale function for a sparsely sampled extended dynamic range digital image, comprising:
- a) a sparsely sampled extended dynamic range image sensing device having fast photosites with a predetermined response to light exposure interspersed with slow photosites with a slower response to the same light exposure for producing a sparsely sampled high resolution digital image having fast pixel values produced by the fast photosites and slow pixel values produced by the slow photosites;
- b) means for analyzing the fast pixel values for saturation;
- and
- c) means for generating the tone scale function using only slow pixel values from the sparsely sampled high resolution digital image if saturation is present in the fast pixel values.
Dependencies are inferred from the claim text.