In this paper, we referred to the simulation results for improving the resolution of the reconstructed image using a phase freedom on the original image in the interference type Fourier transform computer-generated hologram. We are able to arbitrarily specify the phase because the humans can not recognize the slight differences in the phase of the light. We can reconstruct the image more clearly and it can be expected to improve the resolution of the reconstructed image by reducing the errors between the reconstructed image and the original image using this phase freedom. To reduce the influences of the reference light in the prior study, we used a complex amplitude hologram. However, it is difficult to output the complex amplitude holograms and the creation of this hologram is not realistic. So, we created the hologram that can be output to the outside by adapting the proposed method to the interference type hologram that is relatively easy to be create. We must consider the effect of the reference light because of using the reference beam in the interference type hologram. Hereby, the practical hologram using the phase freedom can be generated.

In this paper, we describe the simulation results of improving the resolution of the reconstructed image using the phase freedom in the original image in the Fourier transform amplitude hologram. Since the thing that is recorded in the amplitude hologram is the amplitude information, the phase of the original image is possible to arbitrarily specify. Utilizing the phase freedom can reconstruct an image more clearly by reducing the error of reconstructed image. Therefore, we can expected to improve the resolution of the reconstructed image.

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