Color reproduction corrector for image input device and color reproduction correction method
First Claim
1. A color reproduction correcting device for an image data picked up by an image input apparatus which outputs information regarding a type of an image pick-up light source and information containing chromaticity point data of the image pick-up light source, that is to say information on the estimated result of the image pick-up light source, the color reproduction correcting device for an image input apparatus characterized by comprising:
- white balance matrix production means for receiving the chromaticity point data from the image input apparatus to produce a correction matrix for white balance;
light source type determination means for receiving information on the image pick-up light source from the image input apparatus to determine the types of an image pick-up light source and an image color reproduction light source;
transformation matrix production means for producing a transformation matrix reflecting the optical characteristics of the picked-up object, using predetermined color matching function data, spectral characteristic data regarding the image pick-up light source and color reproduction light source of the types determined by the light source type determination means, optical characteristic data on a predetermined picked-up object and the correction matrix data for white balance; and
color correction processing means for performing color reproduction correction with respect to the image data, using the transformation matrix.
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Accused Products
Abstract
The present invention has an object to provide a color reproduction correcting device for image input apparatus capable of excellently reproducing colors without difficulties, even when an image is reproduced under an observation light source that is different from an image pick-up light source in terms of color rendering. The present invention has white balance matrix production means 130 that receives chromaticity point data from the image input apparatus to produce a correction matrix for white balance, light source type determination means 140 that receives information on the image pick-up light source from the image input apparatus to determine the types of the image pick-up light source and an image color reproduction light source, transformation matrix production means 150 that produces a transformation matrix reflecting the optical characteristics of the picked-up object by using predetermined color matching function data, spectral characteristic data regarding the image pick-up light source and color reproduction light source, of the types determined by the light source type determination means 140, optical characteristics data on a predetermined picked-up object, and correction matrix data for white balance, and color correction processing means 170 that performs color reproduction correction with respect to the image data using the transformation matrix.
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Citations
16 Claims
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1. A color reproduction correcting device for an image data picked up by an image input apparatus which outputs information regarding a type of an image pick-up light source and information containing chromaticity point data of the image pick-up light source, that is to say information on the estimated result of the image pick-up light source, the color reproduction correcting device for an image input apparatus characterized by comprising:
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white balance matrix production means for receiving the chromaticity point data from the image input apparatus to produce a correction matrix for white balance;
light source type determination means for receiving information on the image pick-up light source from the image input apparatus to determine the types of an image pick-up light source and an image color reproduction light source;
transformation matrix production means for producing a transformation matrix reflecting the optical characteristics of the picked-up object, using predetermined color matching function data, spectral characteristic data regarding the image pick-up light source and color reproduction light source of the types determined by the light source type determination means, optical characteristic data on a predetermined picked-up object and the correction matrix data for white balance; and
color correction processing means for performing color reproduction correction with respect to the image data, using the transformation matrix. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A color reproduction correcting method for an image data picked up by the image input apparatus which outputs information on the type of a image pick-up light source and information containing chromaticity point data of the image pick-up light source, that is to say information on the estimated result of the image pick-up light source, the color reproduction correcting method for an image input apparatus, characterized by comprising the steps of:
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receiving the chromaticity point data from the image input apparatus to produce a correction matrix for white balance;
receiving the information on the image pick-up light source from the image input apparatus to determine the types of an image pick-up light source and an image color reproduction light source;
producing transformation matrix reflecting the optical characteristics of the picked-up object, using predetermined color matching function data, spectral characteristic data regarding the image pick-up light source and color reproduction light source, of the types determined by the light source type determination step, optical characteristic data on a predetermined picked-up object and correction matrix data for white balance; and
processing color correction by performing color reproduction correction with respect to the image data, using the transformation matrix. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification