Vision sensors, also called machine vision systems, are compact, self-contained cameras that use image processing to extract information from a scene. These sophisticated devices typically incorporate a high-resolution camera, image processing unit, and illuminator (light source), all in a single housing. A vision sensor helps identify shapes, colours, sizes, and patterns of objects in their respective field of view. Moreover, these advanced optical devices are much easier to set up, are cost-effective, and are widely used in industrial automated systems, ensuring intricate inspections and products meet quality standards. Additionally, using these sensors offers multiple benefits in terms of increased efficiency, reduced error rates, improved quality control, and cost savings.
How Do Vision Sensors Work?
Vision sensors operate using their built-in vital components, including an image sensor, processor, illumination source, and lens. The lens captures images and converts them into digital signals. These signals are then processed using embedded software to extract relevant information. The synergy between these components ensures accurate and reliable data acquisition.
Coloured vs. Monochrome Vision Sensors:
Vision sensors come in two main types used to capture images. Coloured vision sensors capture images in full colour, similar to how the human eye sees the world. They use a colour filter array (CFA) to separate incoming light into different colours, typically red, green, and blue (RGB). This allows the sensor to record the colour information of each pixel in the image.
In contrast, monochrome vision sensors, also called black and white sensors, capture images in shades of grey. They do not use a CFA and instead record the intensity of light at each pixel.
Which One to Choose: Coloured or Monochrome Vision Sensor?
The choice between a coloured and monochrome vision sensor depends on the specific application. If colour is essential, then a coloured sensor is the better option. However, if colour is not important, or if cost, resolution, or low-light performance is a significant concern, then a monochrome vision sensor may be a better choice.
What Industries Use Vision Sensors?
Vision sensors are indispensable in multiple industries, such as:
- Manufacturing
- Healthcare
- Beverage Industry
- Robotics
- Agriculture
- Security and Surveillance
- Automotive Industry
- Consumer Electronics.
