Digital and optical image from computer simulated Fresnel holograms

Computer simulated Fresnel holograms and their numerical reconstruction are obtained in this work using binaries and gray levels images like objects. The Fresnel-Kirchhoff theory is applied without restrictions to implement t he digital hologram. The same theory is taken to simulate numerically the o bject obtained from the digital hologram. In the optical reconstruction pro cess from the digital Fresnel hologram a real image for either binary or gr ay object can be visualized with a higth quality images and low level noise .