Recent advances in computer camera methods for machine vision

Gaylord G. Olson; Jo Norvelle Walker

doi:10.1117/12.326985

6 October 1998 Recent advances in computer camera methods for machine vision

Gaylord G. Olson, Jo Norvelle Walker

Proceedings Volume 3521, Machine Vision Systems for Inspection and Metrology VII; (1998) https://doi.org/10.1117/12.326985
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

During the past year, several new computer camera methods (hardware and software) have been developed which have applications in machine vision. These are described below, along with some test results. The improvements are generally in the direction of higher speed and greater parallelism. A PCI interface card has been designed which is adaptable to multiple CCD types, both color and monochrome. A newly designed A/D converter allows for a choice of 8 or 10-bit conversion resolution and a choice of two different analog inputs. Thus, by using four of these converters feeding the 32-bit PCI data bus, up to 8 camera heads can be used with a single PCI card, and four camera heads can be operated in parallel. The card has been designed so that any of 8 different CCD types can be used with it (6 monochrome and 2 color CCDs) ranging in resolution from 192 by 165 pixels up to 1134 by 972 pixels. In the area of software, a method has been developed to better utilize the decision-making capability of the computer along with the sub-array scan capabilities of many CCDs. Specifically, it is shown below how to achieve a dual scan mode camera system wherein one scan mode is a low density, high speed scan of a complete image area, and a higher density sub-array scan is used in those areas where changes have been observed. The name given to this technique is adaptive sub-array scanning.

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Gaylord G. Olson and Jo Norvelle Walker "Recent advances in computer camera methods for machine vision", Proc. SPIE 3521, Machine Vision Systems for Inspection and Metrology VII, (6 October 1998); https://doi.org/10.1117/12.326985

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KEYWORDS

Cameras

Charge-coupled devices

Machine vision

Head

Software development

Analog electronics

Data conversion

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