tailieunhanh - Machine Vision - David Vernon Part 2

Tham khảo tài liệu 'machine vision - david vernon part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | An introduction to computer vision Automated visual inspection system Figure Components of a machine vision system in the context of a manufacturing environment. the processed image is concerned with the extraction of explicit information regarding the contents of the image . object position size orientation . Thus there is a fundamental difference between image processing and image analysis the former facilitates transformations of images to hopefully more useful images while image analysis facilitates the transformation from an image to an explicit symbolic piece of information. The final phase image interpretation is concerned with making some decision . accept or reject based upon the description of what is in the image it provides the link back to the environment to control the inspection process or the robot manipulator. Each sub-system requires its own specialized type of hardware image formation uses camera technology optics and various light sources. Image acquisition requires an analogue-to-digital converter or frame-grabber to capture a frame of video information image processing is a computationally intensive task due to the amount of data comprising an image and the predominant trend is to accomplish as much of this in hardware as possible. Image analysis typically takes place on a conventional micro mini computer though again there is a trend to accomplish as much of the analysis as possible in dedicated hardware. Image 10 A typical system architecture Figure Typical system architecture after Sanderson 1983 . 11 An introduction to computer vision interpretation is normally effected in software on a conventional computer usually the same one which implements the image analysis. Exercises 1. Comment on the validity of the statement that Industrial machine vision and image understanding have nothing in common . 2. Given that an inspection task typically comprises three main stages of sensing image processing and image analysis identify the