Further field of application of the CIS with Shape-from-Shading
The Contact Image Sensor with Shape-from-Shading illumination also delivers excellent results with coins. As an example, a 2-euro coin is evaluated in the illustration. The highs and lows can be seen clearly and with pin-sharp definition. Since even the smallest scratches are reproduced, you can detect damages very easily with your image processing. Ideally, the gradient images in x and y are used for this purpose. The calculated height image shows the different levels of the coin. The larger the gray value, the higher the level.