A method, system, and computer program product include aiming a light source at an object, where the light source is communicatively coupled to the processor, and where the light source and the image capture device are both positioned at pre-defined distances from a the object and are not in contact with the object. The processor enables the image capture device, to capture measurements of reflected light, where the reflected light comprises the light from the source as the light is reflected out of the object, where the image capture device is communicatively coupled to the processor, and where an image comprises the measurements. The processor obtains the image and locates data indicating a center of the light source in the image. The processor extracts intensities of the reflected light at a pixel location measured to be a predefined distance from the center of the light source in the image.
