Image reading apparatus having a function for rectifying an image distortion caused by a curvature of a document surface and a method for executing the same
First Claim
1. An image reading apparatus having a function for rectifying an image distortion caused by a curvature of a document surface, comprising:
- a document reading device which scans a document, and outputs document image data which are obtained thereby, in order by every one line;
a document height detector which detects a height of the document surface;
a data conversion device which rectifies an image distortion by duplicating the image data that is a line of pixels being output from the document reading device, in accordance with a varied amount of the heights detected by the height detector, and executes a data conversion that is an image processing procedure for the rectified image data, in which the number of bits for pixels is reduced; and
,a memory which memorizes image data which are processed in the data conversion device.
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Abstract
An image reading apparatus having a function for rectifying an image distortion caused by a curvature of a document surface, wherein the image distortion is rectified by duplicating image data that is a line of pixels in accordance with a varied amount of heights of a document surface, and a data conversion that is a image processing procedure in which the number of bits for pixels is reduced, is executed for the rectified image data. Data conversion elements whose number is the same as the maximum duplicated number "N", are arranged in a data conversion device, and the image data of a line to be duplicated arc input to the data conversion elements whose number is the same as duplicated number "n" of the line (n≦N), and then, n-line image data which is processed in n data conversion elements, are stored in a memory. Thereby, reducing a memory capacity needed for the distortion rectification can be achieved without lowering picture quality.
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Citations
15 Claims
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1. An image reading apparatus having a function for rectifying an image distortion caused by a curvature of a document surface, comprising:
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a document reading device which scans a document, and outputs document image data which are obtained thereby, in order by every one line; a document height detector which detects a height of the document surface; a data conversion device which rectifies an image distortion by duplicating the image data that is a line of pixels being output from the document reading device, in accordance with a varied amount of the heights detected by the height detector, and executes a data conversion that is an image processing procedure for the rectified image data, in which the number of bits for pixels is reduced; and
,a memory which memorizes image data which are processed in the data conversion device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An image reading apparatus having a function for rectifying an image distortion caused by a curvature of a document surface, comprising:
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a document reading device which scans a document, and outputs document image data which have a plurality of bits for each pixel in order by every one line; a document height detector which detects a height of the document surface; a controller which determines how many lines are repeatedly output for the one line image data which are output from the document reading device in accordance with the height of the document surface; a binarization processor which binarizes the one line image data which are output from the document reading device, with a plurality of different threshold values, and outputs the binarized image data for lines whose number is determined by the controller wherein said binarized image data have one bit for each pixel; a memory to which the binarized image data which are output form the binarization processor, are input; and
,an image data reading out device which reads out the binarized data from the memory in their input order. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A data processing method for rectifying an image distortion caused by a curvature of a document surface, comprising:
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a step of scanning a document, and outputting document image data which are obtained thereby, in order by every one line; a step of detecting a height of the document surface; a step of rectifying an image distortion by duplicating the image data that is a line of pixels being output from the document reading device, in accordance with a varied amount of the heights detected by the height detector, and executing a data conversion that is an image processing procedure for the rectified image data, in which the number of bits for pixels is reduced, by selecting n data conversion elements form N data conversion elements in accordance with the varied amount of the heights and inputting the image data to the n data conversion elements wherein N is a maximum duplicated number for the distortion rectification and n is a duplicated number that is smaller than N; and
,a step of memorizing n-line image data which are processed in the data conversion step. - View Dependent Claims (15)
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Specification