Detection based on “Camera Images”
What Are Vision Sensors?

This section provides a detailed look at vision sensors.

Outline

Vision sensors use images captured by a camera to determine presence, orientation, and accuracy of parts. These sensors differ from image inspection “systems” in that the camera, light, and controller are integrated together, which makes the unit’s installation and operation simple. There are differences between these sensors and other general-purpose sensors. For example, multi-point inspections can be done with a vision single sensor. In addition, thanks to the wide field of view, detection is possible even when the target position is not consistent.

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Principle and major types

Monochrome model

The image captured by the sensor head (camera) passes through the lens and is converted to an electrical signal by the light receiving element (which is a CMOS in the majority of cases). Then, the brightness and shape of the target is determined according to the brightness and intensity information from each pixel of the light receiving element.

Monochrome model

Color model

The light receiving element is a color type. Unlike the monochrome type, which identifies an intensity range between the extremes of white and black, the received light information is separated into three colors (RGB). Then, the intensity range of each of these colors is identified, which makes it possible to distinguish between targets even when their colors have minimal intensity differences.

Color model