Depth coded shape from focus

Abstract

We present a novel shape from focus method for high- speed shape reconstruction in optical microscopy. While the traditional shape from focus approach heavily depends on presence of surface texture, and requires a considerable amount of measurement time, our method is able to perform reconstruction from only two images. Our method relies the rapid projection of a binary pattern sequence, while object is continuously moved through the camera focus range and a single image is continuously exposed. Deconvolution of the integral image allows a direct decoding of binary pattern and its associated depth. Experiments a synthetic dataset and on real scenes show that a depth map can be reconstructed at only 3% of memory costs and fraction of the computational effort compared with traditional shape from focus.