Dynamic range compression method
First Claim
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1. A method for compressing the dynamic range of an image sensor comprising a multiplicity of pixels, the method comprising the steps of:
- exposing each of said pixels to light and producing an associated photocurrent per pixel, representative of said light exposure; and
on a per-pixel basis, controlling exposure time of each said pixels on the basis of a monotonically rising convex function of said associated photocurrent of each said pixel.
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Abstract
A method for compressing the dynamic range of an image sensor (202) including a multiplicity of pixels. The method includes the steps of exposing each of the pixels to light and producing an associated photocurrent per pixel, representative of the light exposure. Then, on a per-pixel basis, controlling exposure time of each of the pixels on the basis of a monotonically rising convex function of the associated photocurrent of each of the pixel.
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Citations
11 Claims
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1. A method for compressing the dynamic range of an image sensor comprising a multiplicity of pixels, the method comprising the steps of:
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exposing each of said pixels to light and producing an associated photocurrent per pixel, representative of said light exposure; and
on a per-pixel basis, controlling exposure time of each said pixels on the basis of a monotonically rising convex function of said associated photocurrent of each said pixel. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An exposure controller for use in an image sensor comprising a multiplicity of pixels, the controller comprising:
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a memory for storing calculated exposure time values;
a per-pixel parameter table containing local parameters of said pixels; and
a processor for combining based on a set of convergence criteria, said stored exposure time values and said parameters in order to determine, on a per-pixel basis, an exposure time of said pixels. - View Dependent Claims (8, 9, 10, 11)
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Specification