Advanced machine vision inspection of x-ray images for improved productivity
- LumenX Co., Mogadore, OH (United States)
The imaging media has been, for the most part, x-ray sensitive photographic film or film coupled to scintillation screens. Electronic means of imaging through television technology has provided a cost effective, alternative method in many applications for the past three to four decades. Typically, film provides higher resolution and higher interscene dynamic range and mechanical flexibility suitable to image complex shape objects. However, this is offset by a labor intensive task of x-ray photography and processing which eliminate the ability to image in real time. The electronic means are typically achieved through an x-ray source, x-ray to visible light converter, and a television (TV) camera. The images can be displayed on a TV monitor for operator viewing or go to a computer system for capture, image processing, and automatic analysis. Although the present state of the art for electronic x-ray imaging does not quite produce the quality possible through film, it provides a level of flexibility and overall improved productivity not achievable through film. Further, electronic imaging means are improving in image quality as time goes on, and it is expected they will match or surpass film in the next decade. For many industrial applications, the present state of the art in electronic imaging provides more than adequate results. This type of imaging also allows for automatic analysis when practical. The first step in the automatic analysis chain is to obtain the best possible image. This requires an in-depth understanding of the x-ray imaging physics and techniques by the system designer. As previously mentioned, these images may go through some enhancement steps to further improve the detectability of defects. Almost always, image spatial resolution of 512 {times} 512 or greater is used with gray level information content of 8 bits (256 gray levels) or more for preservation of image quality. There are many methods available for analyzing the images.
- OSTI ID:
- 207995
- Report Number(s):
- CONF-9510265-; ISBN 1-57117-013-8; TRN: IM9616%%323
- Resource Relation:
- Conference: 1995 American Society for Nondestructive Testing (ASNT) fall conference and quality testing show, Dallas, TX (United States), 16-20 Oct 1995; Other Information: PBD: 1995; Related Information: Is Part Of ASNT 1995 fall conference and quality testing show: NDT -- The lone star of quality; PB: 204 p.
- Country of Publication:
- United States
- Language:
- English
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