Original image reading device
AssigneeFuji Xerox Co., Ltd.
InventorsHisao Ito, Hajime Sugino
Life of this patent
Estimating the term…
Abstract
An original image reading device having a plurality of light receiving elements for receiving light reflected from an original document, which are formed on a substrate, and for outputing image data signals. Two light receiving elements arrays are formed on a transparent substrate in association with two optical systems. The first light receiving elements array receives light coming through the upper surface of the transparent substrate. The second light receiving elements array receives light coming through the lower surface of the transparent substrate. With such a construction, the image at a location on an original document can be read with the two optical systems. Further, the construction can realize color original image reading device, high resolution, and different focal depths.
Claims11
An image sensor comprising:
- a substrate having a transparent region;
- a first sensor having a transparent electrode, a first photoconductive layer and a first electrode provided on the transparent region of said substrate;
- and
- a second sensor having a second electrode, a second photoconductive layer, and a second transparent electrode provided on said substrate;
- said first and second sensors receiving light beams reflected from the same position on an original through two different optical systems and from two opposing directions.
An original image reading device comprising a plurality of optical systems for splitting light reflected from a location on an original document and condensing the split light, and a plurality of light receiving elements being formed on a transparent substrate in association with the plurality of optical systems, and wherein some of the light receiving elements receive the reflected light from one direction, and the remaining light receiving elements receive the reflected light from a direction opposite the one direction.
An original image reading device comprising:
- a plurality of optical systems for splitting light reflected from a location on an original document and condensing the split light;
- a plurality of light receiving elements for receiving the reflected light, the light receiving elements being formed on a transparent substrate in association with the plurality of optical systems;
- a buffer for reading image signals of a plurality of pixels, the image signals produced every pixel by said light receiving elements provided in association with a plurality of optical systems and for storing the image signals of the plurality of pixels every block in the form of image data in the respective optical systems;
- variance calculating means for calculating variances of the image data of said optical systems for each block stored in the buffer;
- comparing means for comparing the calculated variances of the image data of said optical systems to provide the maximum value of the variances;
- and
- select means for selecting the image data corresponding to the maximum value output from said comparing means.
An original image reading device comprising:
- a plurality of optical systems for splitting light reflected from a location on an original document and condensing the splitting light;
- a plurality of light receiving elements for receiving the reflected light, the light receiving elements being formed on a transparent substrate in association with the plurality of optical systems;
- calculating means for reading image signals of a plurality of pixels, which are produced every pixel by said light receiving elements provided in association with a plurality of optical systems, said calculating means receiving the image signals of the plurality of pixels in the form of image data in the respective optical systems to group the image data into blocks, and then to convert the blocks of image data to frequency components by a fast Fourier transform technique to calculate powers of the converted high frequency components;
- comparing means for comparing the powers of the converted high frequency components of the blocks of image data for said respective optical systems that are output from said calculating means, to thereby provide the maximum value of the variances of the powers;
- and
- select means for selecting the image data corresponding to the maximum value output from said comparing means.
Dependencies are inferred from the claim text.