Color image reading apparatus having variable exposure control
First Claim
1. An image reading apparatus comprising:
- exposing means for exposing an original image;
reading means for reading an image by photoelectrically converting a light from the exposed original image;
detecting means for detecting a density of said image on the basis of a histogram of an output from said reading means; and
control means for controlling an exposure light quantity of said exposing means in accordance with the image density detected by said detecting means.
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Abstract
A color image reading apparatus for reading an image of a color negative film having: an exposing unit to expose the color film; a reading unit to read an image recorded on the color film by photoelectrically converting the transmission light from the exposed color film; a detector to detect a density of the image on the basis of an output from the reading unit; and a controller to control an exposure light quantity of the exposing means in accordance with the image density detected by the detector. The detector detects the image density on the basis of a histogram of the output from the reading unit or on the basis of an output of a special color which is output from the reading unit. With this apparatus, the reading operation suitable for the base density and image density of the color negative film can be performed.
42 Citations
39 Claims
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1. An image reading apparatus comprising:
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exposing means for exposing an original image; reading means for reading an image by photoelectrically converting a light from the exposed original image; detecting means for detecting a density of said image on the basis of a histogram of an output from said reading means; and control means for controlling an exposure light quantity of said exposing means in accordance with the image density detected by said detecting means. - View Dependent Claims (2, 3, 4, 5, 10, 11, 12, 13, 14)
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6. A color image reading apparatus comprising:
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process means including exposing means for exposing a color film, and reading means for reading an image recorded on the color film by photoelectrically converting a transmission light from the exposed color film; detecting means for detecting a base density of the color film and a density of said image; and control means for controlling said process means in accordance with the base density and the image density which were detected by said detecting means. - View Dependent Claims (7, 8, 9, 15, 16, 17, 18, 19, 20, 21)
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22. An image reading apparatus comprising:
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exposure means for exposing an image; read means for reading the image by photoelectrically converting the exposed image line by line; output means for outputting an output of said read means into an image output apparatus; detection means for detecting a density of the image on the basis of the output of said read means, said output corresponding to a predetermined portion in the image; and control means for controlling an exposure light quantity of said exposure means in accordance with the image density detected by said detection means and a base density of the image. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. An image reading apparatus comprising:
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exposure means for exposing an image; read means for reading the image by photoelectrically converting the exposed image line by line; output means for outputting an output of said read means into an image output apparatus; detection means for detecting a density of the image on the basis of the output of said read means, said output corresponding to a predetermined number of lines on the image; and control means for controlling an exposure light quantity of said exposure means in accordance with the image density detected by said detection means. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39)
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Specification