Method and device for compensating for shadows in digital images
First Claim
1. A method of producing a computed digital image of a scene which can be illuminated with different luminous intensities at a first illumination angle by a first light source, a plurality of individual images of the scene under different lighting conditions being taken by an image sensor and being offset against one another in a pixel-by-pixel manner in a data processing device for generating a result image, the method comprising the acts of:
- illuminating the scene with at least one other light source at an illumination angle with different luminous intensities which differ from the illumination angle of the first light source; and
achieving the different illumination conditions during the taking of individual images by different combinations of the luminous intensities of the first and of the at least one other light source.
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Abstract
The invention relates to a method for generating a computed digital image of a scene, which can be illuminated with different luminous intensities at a first illumination angle by a first light source. An image sensor records a number of individual images of the scene under different lighting conditions, and these images are set against one another in a pixel-by-pixel manner in a data processing device in order to generate a resulting image. The invention is characterized in that at least one additional light source is provided by means of which the scene can be illuminated at an illumination angle that is different from the illumination angle of the first light source. The different lighting conditions when recording the individual images are obtained by various combinations of luminous intensities of the first and of the at least one other additional light source. The invention also relates to a device for carrying out the inventive method.
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Citations
19 Claims
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1. A method of producing a computed digital image of a scene which can be illuminated with different luminous intensities at a first illumination angle by a first light source, a plurality of individual images of the scene under different lighting conditions being taken by an image sensor and being offset against one another in a pixel-by-pixel manner in a data processing device for generating a result image, the method comprising the acts of:
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illuminating the scene with at least one other light source at an illumination angle with different luminous intensities which differ from the illumination angle of the first light source; and
achieving the different illumination conditions during the taking of individual images by different combinations of the luminous intensities of the first and of the at least one other light source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15)
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14. A device for producing a computed digital image, comprising a first light source by which a scene to be taken can be illuminated at a first illumination angle with different luminous intensities, an image sensor for the imaging detection of the illuminated scene and the output of digital images of the scene comprising a plurality of pixels, control devices for the coordinated controlling of the light source and of the image sensor, so that individual images of the scene can be taken under different illumination conditions, a data processing device for the pixel-by-pixel offsetting of at least some of the individual images with one another and
at least one other light source by which the scene can be illuminated at a second illumination angle which differs from the first with different luminous intensities, wherein the light sources are controllable by the control devices such that the different illumination conditions during the taking of the individual images can be achieved by different combinations of the luminous intensities of the first and of the at least one other light source.
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19. A method for generating a computed digital image of scene, the method comprising the acts of:
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controlling a first and a second light source operable to illuminate the scene with different luminous intensities at different illumination angles;
taking a first individual image, wherein the first light source illuminates the scene with a first luminous intensity and the second light source illuminates the scene with a second luminous intensity differing from the first;
taking a second individual image wherein the first light source illuminates the scene with the second luminous intensity and the second light source illuminates the scene with the first luminous intensity, and taking a third individual image wherein both light sources each illuminate the scene with the second luminous intensity; and
computing a result image based on the three individual images taken.
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Specification