Contact image sensor, multi-angle optical characteristic detection method and device

Abstract

The invention discloses a multi-angle optical characteristic detection method, which comprises the following steps of: acquiring two images of a predetermined area on a detected object from predetermined angles theta1 and theta2 respectively; and comparing the two images to judge whether the predetermined area has multi-angle optical characteristics. The invention also provides a contact image sensor (CIS), a multi-angle optical characteristic detection device using the CIS and inspection equipment using the detection device. The CIS, the multi-angle optical characteristic detection method and the multi-angle optical characteristic detection device have the advantages of high detection and identification rate and stable and reliable performance.

Description

[0001] This application claims that the application date is November 02, 2010, the application number is 201010533349.3, and the invention name is a multi-angle optical feature detection method and device. The priority of the previous application, the entire content of the previous application has been published in this application reflected in the application. [0002] technical field [0003] The invention relates to the field of optoelectronic technology, in particular to a contact image sensor (CIS, Contact Image Sensor), a multi-angle optical feature detection method and device. Background technique [0004] The multi-angle optical feature means that when the light is irradiated from different angles, or the observed object is observed from different angles, the observed object presents different image characteristics. The image seen by the printed product made by multi-angle optical feature technology has a dynamic changing effect, which cannot be reproduced by hig...

AI Technical Summary

Problems solved by technology

[0012] Second, due to the banknotes of different countries and different currencies, the positions of the multi-angle optical feature areas on the banknotes are different, so a set of equipment can only be applied to one or several banknotes of a certain country Multi-angle Optical Feature Region Detection

[0013] Third, because the focal length of the camera using CMOS or CCD is relatively large, a certain shooting distance is required to shoot a certain range of field of view, so the volume required for the entire shooting device is often relatively large

This also ultimately affects the recognition effect of the color-changing ink

[0016] Moreover, due to different currencies, the positions of the banknotes where the multi-angle optical feature areas are different, and CMOS or CCD devices must be installed on the positions of the multi-angle optical feature areas, so the multi-angle optical feature areas are not in the same position. banknotes that can only be identified by multiple different devices

When a new version of banknotes is issued, if the position of the multi-angle optical feature area changes, the original equipment must be redesigned and updated for hardware

[0017] In addition, the CMOS or CCD camera requires a large volume, and for pointing, inspection, and sorting equipment with a very compact internal design, it will undoubtedly greatly increase the design requirements of the equipment and increase the overall volume of the entire equipment.

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