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What are the advantages of this technique?
Use of Shutter-less Cameras
Some high-resolution industrial cameras simply do not provide any electronic shutter. This missing feature usually prevents the use of these low-cost cameras where there is non-constant web speed. Because it does not require any shutter, the ADR technology is a unique way of using them with the flexibility required by industrial machine vision applications.
Improved Image Quality
With the ADR technology, the camera is used in permanent exposure mode (no shutter), and every part of the object to be inspected is used to build the acquired image. The sensitivity of the camera is as good as it can be, and the signal-to-noise ratio of the resulting image is optimal. Using permanent exposure also reduces the FPN (Fixed Pattern Noise) generated by the sensor. In fact, ADR is the best way to acquire images from a line-scan camera.
From a system point of view, the ADR approach is simpler than the traditional one. There are fewer controls connecting the camera. Last but not least, another advantage of ADR is the operational safety resulting from an operating range wider than the camera line rate range. Indeed, ADR allows the user to acquire lines at up to two times the maximum camera line rate, or below the minimum camera line rate.