Optimal performance is achieved in diffuse ambient lighting. In addition, performance is best if the subject is not back-lit, but this can be compensated for with gain control on video camera As a rule of thumb, if you can see the face in the image, then the system will detect it. Finds faces in any background, plain or cluttered. Functions with equal performance on color or gray scale images. Recognition performance is not significantly affected by low resolution facial images.
Enhanced performance is achieved on higher end hardware.