DVT Cognex Vision
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What is DVT Cognex Machine Vision?
Machine vision, in layman’s terms, is exactly that. It can be defined as machines with their own set of
eyes. Using their vision, machines inspect products for defects by detecting the presence or absence of parts, taking measurements, reading codes, etc. How it works may seem rather complicated at first
glance. However, with a little help from basic optics, it is not. The machine’s eye mainly looks for
changes in contrast and uses a 2-dimensional plane to do so. Our Vision Tools tell the camera (the
machine’s eye) how to evaluate changes in contrast and in what direction to evaluate them. The camera then collects this information from the image and evaluates it following the user-defined rules. Because the camera’s actions are so dependent upon that change in contrast, it is imperative that you adjust your lighting such that the camera (or machine) can get a consistent and close look at the factory product. PDF Electric & Supply Company
Camera Imaging and Pixels
Every image from the Vision Sensor can be considered an array of pixels. For standard resolution
systems, the image consists of 640 columns and 480 rows of pixels (for a total of over 300,000 pixels).
For high resolution systems, the image contains 1280 columns and 1024 rows of pixels (for a total of
over 1.3 million pixels!). Every pixel in the image can be considered a source of information, so from a
standard resolution image, the system obtains over 300,000 data points. For grayscale systems, every
pixel provides a numerical value from 0 to 255 which is normalized to values from 0 to 100. This value is the intensity level of that pixel. An intensity value of 0 corresponds to pure black, an intensity value of
100 corresponds to pure white, and the values in between correspond to 99 different shades of gray. For color systems, every pixel provides 3 different intensity values: one for red, one for blue and one for
green. These three values make up the RGB content of that pixel. Virtually any color can be represented by using the appropriate coefficient for the base colors (Red, Green and Blue). Using this information, Vision Sensors inspect images to provide the user with feedback regarding the presence or absence of a part, flaw detection, code reading and/or verification, etc.
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Cognex In-Sight
In-Sight 5000 features powerful vision capabilities in a tough design. This series has industrial grade features including IP67 and IP68 rated protection against moisture, dust and other contaminants. There are many models to choose from to fit your industrial and manufacturing application needs.