Camera modules are integrated into numerous devices, including mobile telephones, tablet computing devices, and laptop computers. A camera module typically includes one or more rectangular image sensors. In some types of testing, an image of a testing target is focused on the image sensor, and the resulting image is measured for compliance with applicable standards to determine whether the image module is functioning properly. For example, an ISO-12233 standard testing target may be used to measure image sharpness. In this example, a camera module may be tested by exposing the camera module to the ISO-12233 standard testing target, and then measuring the sharpness of the image that results or measuring the contrast of certain sections of the image.