Dynamic range compression
First Claim
1. A method of processing image data, the method comprising the steps of:
- acquiring a frame of image data;
correcting the frame of image data using a set of correction coefficients corresponding to detector elements of a detector array used to collect the frame of image data; and
compressing a dynamic range of the frame of image data using a dynamic range compression algorithm that utilizes down-sampling, median filtering, and up-sampling.
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Abstract
A method and apparatus for processing image data is described, comprising acquiring a frame of image data and compressing the dynamic range of the frame of image data using a dynamic range compression (DRC) algorithm that utilizes down-sampling, median filtering, and up-sampling. The DRC algorithm comprises down-sampling a frame of image data comprising a first array of pixels to generate a second array of pixels, applying a first median filter to the second array of pixels to generate a blurred array of pixels, up-sampling the blurred array of pixels, and removing at least a portion of low-frequency gradient data generated by previous steps from the frame of image data.
69 Citations
52 Claims
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1. A method of processing image data, the method comprising the steps of:
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acquiring a frame of image data; correcting the frame of image data using a set of correction coefficients corresponding to detector elements of a detector array used to collect the frame of image data; and compressing a dynamic range of the frame of image data using a dynamic range compression algorithm that utilizes down-sampling, median filtering, and up-sampling. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 22, 24, 25, 29, 30, 32, 33, 34, 35, 36, 37, 38, 50, 51)
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11. A method of dynamic range compression of image data, the method comprising the steps of:
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down-sampling a frame of image data comprising a first array of pixels to generate a second array of pixels; applying a first median filter to the second array of pixels to generate a blurred array of pixels; up-sampling the blurred array of pixels; and removing at least a portion of low-frequency gradient data generated by previous steps from the frame of image data. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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26. An apparatus for processing image data, comprising:
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an image-data source; and a processor unit coupled to the image-data source, the processor unit being configured to correct a frame of image data using a set of correction coefficients corresponding to detector elements of a detector array used to collect the frame of image data, and compress a dynamic range of the frame of image data using a low-frequency-suppression algorithm that uses down-sampling, median filtering, and up-sampling. - View Dependent Claims (28, 31, 52)
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27. An apparatus for dynamic range compression of image data, comprising:
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a processor unit coupled to an image-data source, the processor unit being configured to; down-sample a frame of image data comprising a first array of pixels to generate a second array of pixels; apply a first median filter to the second array of pixels to generate a blurred array of pixels; up-sample the blurred array of pixels; and remove at least a portion of low-frequency gradient data thereby generated by the processor unit from the frame of image data.
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Specification