Apply Digital Camera to Optimal Combination of Parameter and Evaluation of Image Quality in PCB Inspection

• Main Authors: Wen Hsin Huang, 黃文欣
• Other Authors: Bernard, C. Jiang
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/39948542455521953765

碩士 === 元智大學 === 工業工程與管理學系 === 90 === CCD is used broadly in the field of image processing, due to the graphics processing ability progress in digital technology. A major limitation of CCD cameras is its high cost with a limited resolution (e.g., usually less than 350,000 pixels). While a digital camera usually has resolution of 1 million pixels or more. The digital camera usually suggests taking pictures under auto mode. If the object is reflective, it would engender the auto mode function invalid, therefore image quality will be bad by using the auto mode, such as applying a vision system in a PCB inspection process. The objective of this research is to propose the use of digital camera to replace CCD in PCB inspection applications, and study the unsuitability image inspection of that digital camera under auto mode. More further, find the optimal combination of parameters of a digital camera to increase the ability of inspection. The experiment environment is 20 to 60 Lux of the LED lamp, the main index of evaluation of image quality are perceived image quality, resolution and noise. Finally to establish an inspection system with the determined optimal conditions for the inspection of PCB’s by using digital camera. The experiment results showed that the image captured by the estimation of optimal operation conditions in this research is better than that of using auto mode. The proposed test method can provide a camera uses to determine the best parameters combination when the auto mode is not suitable for application. The results of this research can also provide a digital camera manufacturer for improving the design of the camera.