Previous posts have reviewed different techniques for beam homogenization as well as the difference between spot size and beam angle. This post will review a method for beam shaping using Powell Lenses. Powell lenses are lenses that create a straight laser line by...
In a scanning system, a laser beam moves linearly in one or two dimensions by usually using a galvanometer or scan mirrors. The focused laser can then be used for engraving images in different materials, and drilling, cutting or other applications. However, when...
What is a Telecentric Lens ?An important goal in machine vision applications is taking measurements in a consistent, accurate, and precise manner. This can include measuring the dimensions of manufactured parts to guarantee they are within the...
We’ve built a number of image processing systems that use Raspberry Pi and other single board computers together with OpenCV and other Python libraries such as Scikit image and Dlib. For example, take a look at this defect inspection system This works well for...
CCD vs CMOS CCD and CMOS are both image sensors. They can be found in any device that creates an image. Cameras, webcams, mobile phones. They are one of the most common consumer electronics in world. For many years there has been a debate about which image sensor: CCD...
We’ve been experimenting recently with our OpenMV camera and tools. In this video, you can see a simple system to track objects. Building this cost just $80 for the camera and a few hours’ time of coding and testing. In addition to a cellphone backlight , we were able...
Laser sources are typically used in 3D depth mapping of random and pseudo-random pattern projectors. This is because laser sources are coherent enough to diffract through a diffractive optical element (DOE), unlike non-coherent sources (LED), which can't. The downside...
In industrial applications (including automotive and aviation), small manufacturing defects can lead to expensive or catastrophic failures. Manufacturers rely on human inspection or costly and complex optical systems hardware to detect such defects. Recent advances in...
Screen Scratch Detection System
Phase Shift Method for distance measurement
Scheimpflug principle