Wavelet-Texture Method: BRDF Compression by using Daubechies Wavelet, Reflection Model, and Circular Polarizer

In order to create a photorealistic VR model, we have to record the appearance of the object from different directions under different illuminations. In this paper, we propose a method which renders photorealistic images from small size of data. First, we separates the images of the object into diffuse reflection component and specular reflection component by using circular polarizers. Then, we estimates the parameters of reflection model for each components. Finally, we compressed the difference between the input images and the rendered images by using wavelet transform. At the rendering stage, we first calculate the diffuse and specular reflection images from the reflection parameters, then add the difference decompressed by wavelet inverse transform into the calculated reflection images, and finally obtain the photorealistic image of the object.