Abstract
Single-lens-based optical range finding systems were developed as an efficient, compact alternative for conventional stereo camera systems. Among various single-lens-based approaches, a multiple color-filtered aperture (MCA) system can generate disparity information among color channels, as well as normal color information. In this paper, we consider a dual color-filtered aperture (DCA) system as the most minimal version of the MCA system and present a novel inter-color image registration algorithm for disparity estimation. This proposed registration algorithm consists of three steps: (i) color channel independent feature extraction; (ii) feature-based adaptive weight disparity estimation; and (iii) color mapping matrix (CMM)-based cross-channel image registration. Experimental results show that the proposed method can not only generate an accurate disparity map, but also realize high quality cross-channel registration with a disparity prior for DCA-based range finding and color image enhancement.
Highlights
Disparity estimation is a fundamental process for three-dimensional (3D) information acquisition from an input scene
The proposed method was compared with well-known matching methods sum of absolute differences (SAD), normalized cross-correlation (NCC) and Holloway’s cross-channel normalized gradient (CCNG)
We presented a cross-channel disparity extraction and color registration method with an adaptive weight cost function based on the feature
Summary
Disparity estimation is a fundamental process for three-dimensional (3D) information acquisition from an input scene. A conventional camera has an aperture that is aligned on the optical axis. The light ray from a point of an input scene generates the corresponding convergence pattern on the image sensor. If the aperture deviates from the optical axis as shown, the convergence point moves away from the image center. In this configuration, the convergence point on the image sensor moves up and down depending on the distance of the object from the camera. The DCA optical system generates the same image of the conventional camera system in the in-focus region, but generates a color-misaligned image in the out-of-focus region
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