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Method and apparatus to guarantee minimum contrast for machine vision system

A machine vision system, contrast technology, applied in stereo systems, lighting devices, instruments, etc., can solve problems such as the inability of the vision system to detect objects and the lack of contrast.

Active Publication Date: 2015-07-22
ORMON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in some special cases, the vision system will not be able to detect the object due to the lack of contrast

Method used

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  • Method and apparatus to guarantee minimum contrast for machine vision system
  • Method and apparatus to guarantee minimum contrast for machine vision system
  • Method and apparatus to guarantee minimum contrast for machine vision system

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Embodiment Construction

[0020] The present disclosure provides beneficial teaching in several areas, including: (1) lighting arrangements for assuring contrast of objects; (2) methods and apparatus for monitoring lighting conditions; and (3) methods for measuring contrast and device. These and other advantages can be achieved at least by means of figure 1 The configuration and operation of the lighting monitoring device 10 of the illustrated example are implemented in part.

[0021] The illumination monitoring apparatus 10, in one or more embodiments, is configured to monitor an illumination source used as a key light 12, wherein the illumination from the key light 12 enhances object contrast within the field of view of the machine vision system 14 . This field of view defines a surveillance area or space 16, collectively referred to as "surveillance space 16." In a non-limiting example, the surveillance space 16 may be understood as an area or area surrounding a hazardous machine or area 18 where...

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Abstract

In one aspect, this disclosure presents a method and apparatus for verifying that minimum object contrast requirements are met within a region representing a volume to be monitored by a machine vision system. In complementary fashion, the disclosure also presents a methodology for constraining the positions of the lighting sources to be used for illuminating the monitored volume at a minimum height above the floor, and for the use of a key light that provides asymmetrical lighting within the monitored volume relative to the camera(s) used for imaging the monitored volume. Correspondingly, the disclosure also presents a method and apparatus for monitoring for proper operation of the key light and responding to improper operation. The minimum contrast verification and key light monitoring operations can be implemented using standalone apparatuses, or can be incorporated into the machine vision system.

Description

[0001] This application claims priority to US Provisional Application 61 / 646,491, filed May 14, 2012. technical field [0002] The invention relates to an image-based (machine vision) monitoring system, for example for protecting machines. Background technique [0003] In general, vision systems rely on the contrast of pixel brightness to detect objects. This contrast can be caused by the texture of the object, a different color between the object and the background, or shadows on the surface of the object, among others. Without making certain assumptions, there is no guarantee of contrast, since the object may not have any texture on it, its color may be similar to that of the background, or depending on its shape and / or lighting conditions, there may be no shadows. Therefore, in some special cases, the vision system will not be able to detect the object due to the lack of contrast. This problem becomes especially noticeable when the visual surveillance system is applied...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T1/00H05B37/03H04N13/239
CPCY02B20/46H04N13/0239G06T2207/30204H05B37/0218G06T2207/30168G09G1/002G06T1/0007H04N13/0271G06T2207/10028H04N13/0242G06T7/0002G06T7/0051H04N13/243H04N13/239H05B47/11Y02B20/40H04N13/271
Inventor 木下航一阿姆布里什·特亚吉约翰·德林卡尔德谷喜东
Owner ORMON CORP
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