Structured Light

The Zivid camera functions on the principle of structured light. Zivid contains a projector and a camera that is placed at a specific angle to and distance from each other. Light patterns are projected by the projector onto the object and the displacement in the light patterns are used to calculate the depth of the object at every point, giving you a 3D model of your object Zivid uses in combination with structured light. For every image grab performed by Zivid, several images are captured by the camera at a remarkable acquisition rate of 10 Hz to ensure that the captured point cloud is the most accurate.  

One of Zivid’s most unique features is the HDR capability. ‘Difficult’ objects are made easy with this feature. The HDR mode works with multiple active iris settings. The camera captures images with each specified active iris setting and then combines them into one high quality image. This is especially useful because different colors and different materials work better with different iris settings. Lighter colors have better results with lower iris settings, while darker colors need more light (higher iris setting) for a good 3D point cloud. With the HDR function you needn't compromise when you have a combination of materials and colors and shiny metallic objects. You can specify multiple iris settings that together cover all the objects( or all the different parts of an object) to give you a complete point cloud, and the HDR mode combines all these individual images to give you one, high-quality image with optimal accuracy.

The active iris and exposure time settings go hand-in-hand to determine the amount of light that passes through the camera. An active iris setting of 0 denotes that the iris is fully closed and no light gets through even if the exposure time is high. Once the active iris setting is sufficiently high to allow light to pass through, increasing exposure time and increasing the active iris setting achieves the same results. Generally, it is good practice to keep the active iris settings below 40 and go up in exposure time after that. Read more about determining optimal active iris settings with HDR mode here

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Some other features that make Zivid special are the filters that give you added functionality. The reflection filter for example ensures that you can take images of shiny objects without false points/noise. Consider a bin picking scenario where the camera mistook false points (points in the point cloud corresponding to reflections) as part of the object. The robot would then begin to attempt picking at a noise points instead of the actual object. Without the reflection filter to distinguish between noise points and the actual point cloud, it would be an erroneous and chaotic process!