The accurate detection of blemishes significantly improves the camera quality of smart devices.
In mass manufacturing, special tests are needed to detect blemishes occurring on the camera's sensor pixels. A camera blemish test verifies that the camera’s CCD sensor has been assembled correctly, and the optics do not have any particles blemishing its view.
The device camera is covered with uniform light of which the device takes a picture. The picture is processed with a machine-vision algorithm to find dead pixels or dark areas. A uniform black picture can also be taken and processed.