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Two-Dimensional Calibration for Image Sensor Alignment in Optical Scanners

A technology of image sensors and scanners, applied in the field of optical scanning, can solve problems such as limited

Active Publication Date: 2016-01-27
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has limited ability to compensate for variations between image sensors, requiring manual calibration and / or adjustment of image sensor positions

Method used

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  • Two-Dimensional Calibration for Image Sensor Alignment in Optical Scanners
  • Two-Dimensional Calibration for Image Sensor Alignment in Optical Scanners
  • Two-Dimensional Calibration for Image Sensor Alignment in Optical Scanners

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Embodiment Construction

[0065] In the following description, reference is made to the accompanying drawings which show by way of example how the invention may be practiced.

[0066] Figure 1a Two image sensors 102103 are shown provided with overlapping regions 104105 according to one embodiment of the invention. The image sensor 102103 may be a CIS image sensor. The image sensor 102103 may be disposed on a movable assembly that moves the image sensor across the media to be scanned, and / or the media may be moved past the image sensor using suitable means (e.g., a motorized roller that pulls the physical media past the image sensor) sensors to generate a complete image of the physical medium. Image sensors 102103 may be configured such that a portion of the area of ​​the scanned medium recorded by one image sensor is also recorded by the other image sensor; for example, area 104 of image sensor 102 at exactly another point in time (e.g., moved) is recorded in the same area as the area 105 of the ima...

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PUM

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Abstract

Disclosed herein is a method for processing image signals from first and second image sensors in a document scanner unit, wherein the first image sensor provides a first image and the second image sensor provides a second image. The first and second images are two-dimensional images, wherein the first and second images are recorded at respective areas of the scanned medium, wherein a portion of the respective areas is also recorded by the other of the respective image sensors. Thus, there is image data from overlapping and non-overlapping regions in the first and second images. The method includes associating a first image with a second image, generating an associated image and processing the associated image to determine a displacement between the first image and the second image. Therefore, a general calibration method is provided which can determine the two-dimensional displacement between the first image and the second image.

Description

technical field [0001] The present invention generally relates to optical scanning of objects. More particularly, the invention relates to optical scanning of large documents by an optical scanner comprising multiple image sensors, and to the calibration of such an optical scanner. Background technique [0002] Since manufacturing a large single image sensor is a difficult and expensive task, multiple image sensors are often used to scan large objects, such as large maps or technical drawings. Examples of image sensors are Charge Coupled Devices (CCD) or Contact Image Sensors (CIS). The image sensor is typically located on a moving fixture that moves across the media to be scanned, or the media is pulled past the fixture by a drum motor. After the scanner is produced, the exact position of the image sensor can be determined by a suitable calibration procedure. However, due to stresses induced on the scanner during transport and / or use, small movements of the image sensor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/19H04N1/387
CPCH04N1/19H04N1/1903H04N1/193H04N1/1934H04N1/195H04N1/19584H04N1/3876H04N1/00031
Inventor 赫拉德·费尔哈格
Owner CONTEX