KEYWORDS: 3D metrology, Cameras, 3D image processing, Imaging systems, 3D vision, Digital image processing, Atomic force microscopy, Graphics processing units, Image processing, Image compression
This paper proposes a Graphics Processing Unit (GPU) implementation of the stereo correspondence matching
using Phase-Only Correlation (POC). The use of high-accuracy stereo correspondence matching based on POC
makes it possible to measure accurate 3D shape of an object using stereo vision, while the drawback of POCbased
approach is its high computational cost. Addressing this problem, we propose a GPU implementation of
POC-based correspondence matching. Through a set of experiments using a variety of GPUs, we demonstrate
that the proposed implementation exhibits high-speed and high-efficiency computation of POC-based stereo
correspondence matching compared with the CPU implementation. We also apply the proposed implementation
to two types of 3D measurement application and demonstrate their effectiveness.
For accurate color reproduction of motion pictures or still pictures of moving objects, we developed a different one-shot six-band image-capturing and visualization system that combines multiband and stereo imaging techniques. The proposed system consists of two consumer-model digital cameras and an interference filter whose spectral transmittance is comb-shaped. Subpixel correspondence search between the stereo image pairs is conducted and image transformation whose parameters are estimated from the correspondence is used to correct the geometric relationship between the images. The Wiener estimation method is used for color reproduction. For experiments, we have constructed two six-band camera systems to evaluate the quality of resultant images. One is for capturing high-resolution images using digital single-lens reflex cameras. The other is for capturing motion pictures using digital video cameras, for which all image processing steps after image capture are implemented on graphics processing units and the frame rate of the system is 30 fps when image size is XGA. For both systems, the average color difference between the measurement data and estimation results for 24 color patches of the Macbeth ColorChecker™ is dEa ∗ b ∗ =1.21 at maximum.
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