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Calibrating method for scanning instrument

A calibration method and scanner technology, applied in the field of scanner calibration, can solve problems such as application limitations, achieve the effect of high repetition rate and reduce linearity error

Inactive Publication Date: 2006-03-01
北京紫枫科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of calibration technology of linearity error, general scanners are limited in application in these fields.

Method used

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  • Calibrating method for scanning instrument
  • Calibrating method for scanning instrument
  • Calibrating method for scanning instrument

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The flow of this embodiment is as follows figure 2 shown.

[0034] 1) Making benchmark stamps and measuring: Use metals with low deformation at room temperature. In this embodiment, a copper material is used to make a perfect circular stamp. The imprinted surface of the stamp is a combination of patterns and characters, and its edges are smooth and tidy. There is an endpoint at both ends of the x and y axes of the stamp. Use a measuring microscope to measure the distance between the two axes of the seal.

[0035] 2) Make a scanner calibration card: choose a relatively solid paper, and print two seals with the reference seal. The angle difference between the two prints is 90°, and the distance between the two prints is about 20mm, such as figure 1 shown. Cut the paper to a size of 200×100mm.

[0036] 3) Obtaining the reference image file: the reference image file is the theoretical image data corresponding to the printed text of the calibration card (or the referenc...

Embodiment 2

[0045] The flow of this embodiment is as follows image 3 shown.

[0046] 1) Making a reference seal and measuring: In this embodiment, copper material is used to make a square seal. The seal surface is a combination of patterns and characters, and its edges are smooth and tidy; the x and y axes of the seal each have an endpoint . Use a measuring microscope to measure the distance between the two axes of the seal.

[0047] 2) Obtain the calibration card and reference image file as in embodiment 1, the effect of the reference image file is as follows Figure 5 .

[0048] 3) Use a scanner to scan the calibration card to obtain a preliminary image. After extracting the image, use one of the printed images as the template image IMG_M, rotate and scale the other image IMG_T to match the template image IMG_M, and calculate the matching rate. In this embodiment, the formula for calculating the matching rate is: r = ( N ...

Embodiment 3

[0051] The flow of this embodiment is as follows image 3 shown.

[0052] 1) Obtain reference stamp, calibration card and reference image file as in Example 1.

[0053] 2) Use a scanner to scan the calibration card to obtain a preliminary image. After extracting the image, use one of the printed images as the template image IMG_M, rotate and scale the other image IMG_T to match the template image IMG_M, and calculate the matching rate. In this embodiment, the formula for calculating the matching rate is: r = I ∩ M I ∪ M = Σ i = 1 n I i ∩ M i ...

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Abstract

A calibration method of scanner includes preparing reference specimen seal , scanner calibration card and a reference image file ; comparing actually scanned image with ideal image for obtaining calibration value ; matching actually scanned image itself first for obtaining image with the same contraction-enlargement rate at biaxial directions then matching it with reference image file for generating calibration value.

Description

technical field [0001] The invention relates to the technical field of scanner calibration, in particular to scanner linearity error calibration [0002] technology field. Background technique [0003] As an optoelectronic integrated computer peripheral, scanner has a history of more than ten years. However, all hardware devices have a margin of error, among which, the margin of error of a general scanner is 2%-3%. The error of the scanner is reflected in two aspects, namely linear error and nonlinear error. Among them, the linear error is mainly reflected in the difference between the size of the scanned image and the size of the original due to the mechanical reasons of the instrument. [0004] In some special fields, such as bank seal recognition, it is necessary to use image acquisition equipment such as cameras or scanners to input standard seals (ie reserved seals) and banknote seals to be identified into computers. Since the entire identification process is to com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/047
Inventor 邱锐
Owner 北京紫枫科技开发有限公司
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