The ISO measures the sensitivity of the sensor in the camera. Much like a digital camera, the lower the number the less sensitive your camera is to light and the finer the grain. The higher the ISO selected, the more noise you will get in your image.
There are 3 main questions to ask in regards to selecting an ISO :
- Stationary camera - Is the camera stationary(on a tripod or mount)?
- Stationary target object - Is the target object stationary?
- Light - Is the target object well lit?
The answer to the 1 is YES.
The smartphone is mounted on the EORA3D scanner which is a stable object placed on a solid surface. The same applies when the scanner is mounted on a tripod
The answer to 2 is YES.
The nature of 3d scanning requires the target object to be as stationary as possible with any movements affecting the results. As the EORA3D scanner is a laser scanner using triangulation, this means the target object does need to be specifically stationary to obtain results accurate to sub-100 microns
This brings us to question number 3.
The factor which matters most in the context of ISO settings in-app is the lighting conditions of the target object. The general rule of thumb is ff there is plenty of light, a lower ISO rating will produce good scans.
It is important to note that this is dependant on the exposure time and the rpm as well. Changing the ISO alone will not improve the results of the scan but it is a fine tune between the 3 adjustable values. A better understanding can be obtained from the triangle of exposure below :
The ISO values range from 25 to 135 in increments of 5.
You can refer to our article on Exposure Time for an understanding on how it also affects results.