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Segmentation Technique for Automatic Visual Inspection Using a Color Camera

IP.com Disclosure Number: IPCOM000039851D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Hutson, DJ: AUTHOR

Abstract

In a top-lighted vision inspection system using a monochromatic camera, variations in reflected light intensity are used to attempt to segment materials which are present on the test object. If the materials can be correctly segmented, then the object can be tested for the presence or absence of a material in a particular location. In general, segmentation of metals with a monochromatic camera is difficult. On the (Image Omitted) second metallization (M2) layer of a metallized ceramic polyimide (MCP) substrate, it is important to detect extraneous chrome or solder on the copper clad, controlled collapse chip connector (C4) pads and also, to detect missing chrome in chrome dam areas.

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Segmentation Technique for Automatic Visual Inspection Using a Color Camera

In a top-lighted vision inspection system using a monochromatic camera, variations in reflected light intensity are used to attempt to segment materials which are present on the test object. If the materials can be correctly segmented, then the object can be tested for the presence or absence of a material in a particular location. In general, segmentation of metals with a monochromatic camera is difficult. On the

(Image Omitted)

second metallization (M2) layer of a metallized ceramic polyimide (MCP) substrate, it is important to detect extraneous chrome or solder on the copper clad, controlled collapse chip connector (C4) pads and also, to detect missing chrome in chrome dam areas. The utilization of a color camera with its additional chrominance information can easily be used to segment the chrome or solder from the copper at the C4 pads or doughnuts. Fig. 1 shows a simplified block diagram of a color camera system. When an image is scanned, video signals corresponding to the desired picture information are obtained for the red, green, and blue information in the scene. An intensity signal (Y) and various chrominance signals are generated within the color camera system and can be used along with the red, green and blue signals for materials segmentation. For chrome/solder segmentation, the intensity signal (Y) and the red signal (R) will be used. Typical reflectance curves of the materi...