Detection and removal of blemishes in digital images utilizing original images of defocused scenes
First Claim
1. A digital image acquisition device, comprising:
- an image acquisition sensor,a shutter,optical elements for focusing an image on the sensor,an aperture disposed between said optical elements and said shutter,a translucent lens cap which defocuses images when in place,digitally-embedded programming such that the device is arranged to automatically capture a calibration image of a de-focused scene when said shutter and said aperture are open, and to derive a color or luminance map, or a combination thereof, from the calibration image acquired by the sensor when illuminated by ambient light, the digitally-embedded programming capable of classifying color and/or luminance defects, respectively, and correcting said color and/or luminance defects when determining sufficient color and/or luminance defects to render said color and/or luminance acceptable within an acquired image; and
a trigger for automatically acquiring a de-focused calibration image which is arranged to automatically detect whether the translucent lens cap is in place as a pre-requisite for triggering capture of the defocused calibration image.
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Accused Products
Abstract
A method automatically corrects dust artifact within image acquired by a system including a digital acquisition device including a lens assembly and a translucent lens cap. Multiple original digital images are acquired with the digital acquisition device. Probabilities that certain pixels correspond to dust artifact regions within the images are determined based at least in part on a comparison of suspected dust artifact regions within two or more of the images. Probable dust artifact regions are associated with extracted parameter values relating to the lens assembly when the images were acquired, A statistical dust map is formed including mapped dust regions based on the determining and associating. Pixels corresponding to correlated dust artifact regions are corrected within further digitally-acquired images based on the associated statistical dust map.
147 Citations
34 Claims
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1. A digital image acquisition device, comprising:
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an image acquisition sensor, a shutter, optical elements for focusing an image on the sensor, an aperture disposed between said optical elements and said shutter, a translucent lens cap which defocuses images when in place, digitally-embedded programming such that the device is arranged to automatically capture a calibration image of a de-focused scene when said shutter and said aperture are open, and to derive a color or luminance map, or a combination thereof, from the calibration image acquired by the sensor when illuminated by ambient light, the digitally-embedded programming capable of classifying color and/or luminance defects, respectively, and correcting said color and/or luminance defects when determining sufficient color and/or luminance defects to render said color and/or luminance acceptable within an acquired image; and a trigger for automatically acquiring a de-focused calibration image which is arranged to automatically detect whether the translucent lens cap is in place as a pre-requisite for triggering capture of the defocused calibration image. - View Dependent Claims (2, 3, 4)
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5. A digital image acquisition device having no photographic film, comprising an optical system, a processor and one or more storage devices for programming the processor to control the camera to perform a method of automatically correcting color or luminance defect conditions, or a combination thereof, within acquired images, the method comprising:
- acquiring one or more original digital images through a translucent lens cap disposed along an optical path between an object and one or more components of the optical system including a digital sensor;
automatically acquiring a defocused calibration image when a trigger automatically detects that the translucent lens cap is in place;
determining probabilities that certain pixels correspond to color or luminance defect regions, or a combination thereof, within said one or more original digital images;
associating the color and/or luminance defect regions with one or more acquisition parameters when the one or more original digital images were acquired;
forming a statistical color and/or luminance defect map including mapped color and/or luminance defect regions based on the calibration image and the color and/or luminance defect region probability determining and associating; and
correcting pixels corresponding to color and/or luminance defect regions within each of said one or more original images based on the associated statistical color and/or luminance defect map; and
wherein said determining probabilities further comprises statistically combining a plurality of individual probabilities based on each said region within two or more images. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
- acquiring one or more original digital images through a translucent lens cap disposed along an optical path between an object and one or more components of the optical system including a digital sensor;
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15. A digital image acquisition device having no photographic film, comprising an optical system, a processor and one or more storage devices for programming the processor to control the camera to perform a method of automatically correcting color or luminance defect conditions, or a combination thereof, within acquired images, the method comprising:
- acquiring one or more original digital images through a translucent lens cap disposed along an optical path between an object and one or more components of the optical system including a digital sensor;
automatically acquiring a defocused calibration image when a trigger automatically detects that the translucent lens cap is in place;
determining probabilities that certain pixels correspond to color or luminance defect regions, or a combination thereof, within said one or more original digital images;
associating the color and/or luminance defect regions with one or more acquisition parameters when the one or more original digital images were acquired;
forming a statistical color and/or luminance defect map including mapped color and/or luminance defect regions based on the calibration image and the color and/or luminance defect region probability determining and associating; and
correcting pixels corresponding to color and/or luminance defect regions within each of said one or more original images based on the associated statistical color and/or luminance defect map; and
judging certain probable color and/or luminance defect regions as having a probability above a second threshold value such as to be subject to said correcting; and
wherein said determining probabilities further comprises statistically combining a plurality of individual probabilities based on each said region within two or more said images. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
- acquiring one or more original digital images through a translucent lens cap disposed along an optical path between an object and one or more components of the optical system including a digital sensor;
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25. A digital image acquisition device having no photographic film, comprising an optical system, a processor and one or more storage devices for programming the processor to control the camera to perform a method of automatically correcting color or luminance defect conditions, or a combination thereof, within acquired images, the method comprising:
- acquiring one or more original digital images through a translucent lens cap disposed along an optical path between an object and one or more components of the optical system including a digital sensor;
automatically acquiring a defocused calibration image when a trigger automatically detects that the translucent lens cap is in place;
determining probabilities that certain pixels correspond to color or luminance defect regions, or a combination thereof, within said one or more original digital images;
associating the color and/or luminance defect regions with one or more acquisition parameters when the one or more original digital images were acquired;
forming a statistical color and/or luminance defect map including mapped color and/or luminance defect regions based on the calibration image and the color and/or luminance defect region probability determining and associating; and
correcting pixels corresponding to color and/or luminance defect regions within each of said one or more original images based on the associated statistical color and/or luminance defect map; and
digitally-acquiring additional images with said digital acquisition device, repeating said determining and associating, and updating said statistical defect map including updating said mapped defect regions based on the additional defect region determining and associating, and wherein said determining includes dynamically updating said probabilities based on comparisons with suspected equivalent defect regions within the additional digitally-acquired images. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34)
- acquiring one or more original digital images through a translucent lens cap disposed along an optical path between an object and one or more components of the optical system including a digital sensor;
Specification