Reduction of blur in multi-channel images
First Claim
Patent Images
1. A method of reducing blur in a multi-channel digital image, the method comprising:
- comparing first and second color channels of a high frequency feature in the image to derive information that is missing from the second channel due to the blur; and
using the information to adjust the feature in the second channel so that sharpeness of the feature is similar in both the first and second channels.
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Abstract
A color digital image is processed to reduce blur. First and second color channels of a high frequency feature (e.g., an edge) in the image are compared to derive information that is missing from the second channel due to the blur. The information is used to adjust the feature in the second channel so that sharpeness of the feature is similar in both the first and second channels. As a first example, the processing may be used to correct chromatic aberration in an image captured by a digital camera. As a second example, the processing may be used to reduce blur in images created during film restoration.
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Citations
40 Claims
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1. A method of reducing blur in a multi-channel digital image, the method comprising:
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comparing first and second color channels of a high frequency feature in the image to derive information that is missing from the second channel due to the blur; and
using the information to adjust the feature in the second channel so that sharpeness of the feature is similar in both the first and second channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for an image capture device, the method comprising capturing an image;
- pre-processing the image; and
reducing blur in the pre-processed image, the blur reduction including;
comparing a sharpest channel to derive high frequency information that is missing from blurred channels due to the blur; and
using the information to adjust the blurred channels so that sharpeness of the blurred channels is similar to the sharpness of the sharpest channel.
- pre-processing the image; and
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28. A method of restoring film, the method comprising projecting frames of the film onto a scanner;
- and for each frame
computing a blur estimate that, when applied to a first channel, approximates blur in a second channel;
using the first channel to produce a scaled approximation of the second channel; and
applying the blur estimate to the scaled approximation to determine a sharpened replacement for the second channel. - View Dependent Claims (29, 30, 31, 32, 33, 34)
- and for each frame
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35. Apparatus comprising a processor for reducing blur in a multi-channel digital image, the blur reduction including
comparing first and second color channels of a high frequency feature in the image to derive information that is missing from the second channel due to the blur; - and
using the information to adjust the feature in the second channel so that sharpeness of the feature is similar in both the first and second channels. - View Dependent Claims (36, 37, 38, 39)
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40. An article for a processor comprising memory encoded with data for causing the processor to reduce blur in a multi-channel digital image, the blur reduction including:
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comparing first and second color channels of a high frequency feature in the image to derive information that is missing from the second channel due to the blur; and
using the information to adjust the feature in the second channel so that sharpeness of the feature is similar in both the first and second channels.
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Specification