Multi-color document reading apparatus for facsimile and multi-color facsimile
First Claim
1. A multi-colour document reading apparatus for reading a document, disposed at a predetermined position and containing a multi-colour representation, on a line-by-line basis while discriminately identifying the colours of the multi-colour representation, comprising:
- an image sensor for sensing optical images in a predetermined area including at least one line on said document disposed at said predetermined position;
light source means for selectively illuminating at least said predetermined area in one of first and second energized states, the first energized state having different spectral characteristics than the second energized state;
switch means for selectively energizing said light source means for illuminating said document in one of said first and second states;
distortion correcting means including memory means for storing first and second shading waveforms derived from data sensed by said image sensor for optical images corresponding to a standard sheet having a specific colour disposed at said predetermined position and illuminated by said light source means in said first and second energized states, respectively, means for reading out said first and second shading waveforms from said memory means before said document is read by said image sensor on the line-by-line base, correcting means for correcting first and second line data detected by said image sensor from an optical image on one line of said document illustrated by said light source means in said first and second states in accordance with said first and second shading waveforms read out from said memory means, respectively; and
colour separating means for discriminately identifying different colours of the multi-colour representation included in said one line of said document for generating colour-separated signals representing the different colours.
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Accused Products
Abstract
A multi-color document reading apparatus used in a facsimile apparatus for reading a document disposed at a predetermined position containing pictures of multiple colors on a line-by-line basis while discriminately identifying the colors includes an image sensor for sensing optical images in a predetermined area including at least one line of the document disposed at the predetermined position, light sources for selectively illuminating at least the predetermined area in one of first and second energized states differing from each other in respect to the spectral characteristics thereof, a switch circuit for selectively energizing the light sources for illuminating the document in one of the first and second states, a distortion correcting circuit including memories for storing first and second shading waveforms derived from data sensed by the image sensor for optical images of a standard sheet of a specific color disposed at the predetermined position and illuminated by the light source in the first and second energized states, respectively, and a color separating circuit for identifying data of different colors of the multi-color pictures included in one line of the document for generating color-separated signals representing the different colors.
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Citations
25 Claims
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1. A multi-colour document reading apparatus for reading a document, disposed at a predetermined position and containing a multi-colour representation, on a line-by-line basis while discriminately identifying the colours of the multi-colour representation, comprising:
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an image sensor for sensing optical images in a predetermined area including at least one line on said document disposed at said predetermined position; light source means for selectively illuminating at least said predetermined area in one of first and second energized states, the first energized state having different spectral characteristics than the second energized state; switch means for selectively energizing said light source means for illuminating said document in one of said first and second states; distortion correcting means including memory means for storing first and second shading waveforms derived from data sensed by said image sensor for optical images corresponding to a standard sheet having a specific colour disposed at said predetermined position and illuminated by said light source means in said first and second energized states, respectively, means for reading out said first and second shading waveforms from said memory means before said document is read by said image sensor on the line-by-line base, correcting means for correcting first and second line data detected by said image sensor from an optical image on one line of said document illustrated by said light source means in said first and second states in accordance with said first and second shading waveforms read out from said memory means, respectively; and colour separating means for discriminately identifying different colours of the multi-colour representation included in said one line of said document for generating colour-separated signals representing the different colours. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 24, 25)
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15. A multi-colour facsimile apparatus including a multi-colour document reading apparatus for reading a document, disposed at a predetermined position and containing a multi-colour representation, on a line-by-line basis while discriminately identifying the colours of the multi-colour representation, comprising:
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an image sensor for sensing optical images in a predetermined area including at least one line on said document disposed at said predetermined position; light source means for selectively illuminating at least said predetermined area in one of first and second energized states, the first energized state having different spectral characteristics than the second energized state; switch means for selectively energizing said light source means for illuminating said document in one of said first and second states; distortion correcting means including memory means for storing first and second shading waveforms derived from data sensed by said image sensor for optical images corresponding to a standard sheet having a specific colour disposed at said predetermined position and illuminated by said light source means in said first and second energized states, respectively, means for reading out said first and second shading waveforms from said memory means before said document is read by said image sensor on the line-by-line basis, correcting means for correcting first and second line data detected by said image sensor from an optical image on one line of said document illustrated by said light source means in said first and second states in accordance with said first and second shading waveforms read out from said memory means, respectively; and colour separating means for discriminately identifying different colours of the multi-colour representation included in said one line of said document for generating colour-separated signals representing the different colours, said facsimile apparatus further including transmitting means for externally transmitting said colour-separated signals generated by said multi-colour document reading apparatus, and recording means for recording an image represented by said colour-separated signals in one colour. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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Specification