Accuracy in face recognition largely depends on the quality in the images of the face. Above all, the utmost care must be in the acquisition of images of the face of good quality in the step of registration. During the registration stage one or more pictures of the face of the person are converted into a template which contains the characteristic features of the face. This template is stored in a database and is used to identify or quickly verify the person. The following basic recommendations and requirements should be taken into consideration: Poses and expressions of the face always look towards the camera lens.
Use images of the face front and close to the camera with a deviation of up to 10 degrees in any direction rotation to the registration process. In the registration process use more than one picture of the face, to cover the face slightly different points of view. When they achieve a successful coverage of the face, this can be recognised with up to 25 degrees of deviation of the front. At the stage of registration a neutral facial expression (the clear face, both eyes open and closed mouth) is preferred. During the process of identification and verification, slight changes in facial expression are recommended for detection of vital face. If you use glasses you must have multiple images (with and without glasses) for the stage of registration.
Thus, during the identification shall be recognised in both cases. Sunglasses with thick frames and sunglasses will decrease the accuracy of facial recognition. If you change the appearance of the face by facial hair, you must have multiple images in the same way as with the use of glasses. Recognition of vital face during the process of identification and verification using recognition of vital face. This function allows to distinguish living faces of non-living faces (e.g., photos). Observe the following instructions: only a person face must be visible in the image obtained by the camera. Move your head a little, by tilting it or most moving closer or further away from the camera while slightly changing his facial expression. (for example, you can start with the head facing to the left and slowly start to turn to the right, changing the expression of his face). Lighting if the lighting conditions can be controlled: lighting should be evenly distributed on each side of the face and top down, no significant shadows within the region of the face. This can be achieved through the use of direct frontal or diffuse lighting. Avoid any additional lighting or sunlight. Avoid lighting that can produce reflections in eyeglasses or even in the skin of the face. This information is applicable to the software for biometric access control and attendance of personal i-Faces Planigrafo Carlos Alberto Quijano AcevedoProfesional I.T.