To some extent, the mapping relationship between the camera and projector images determines the precision of surface
reconstruction in digital close-range photogrammetry. In this paper, a new method is presented to achieve sub-pixel-level
mapping between the camera and projector images. Instead of mapping the stripe from the camera to the projector, which
is pixel-precision-based, a set of pixels that share the same decoded number were picked out on the camera images and
their barycenter was calculated to mapped onto the pixel on the projector images. In most cases, the calculation of the
barycenter is able to achieve sub-pixel precision. Compared with existing approaches based on the direct mapping of the
stripe on the camera image to the projector image, the proposed method is characterized by higher accuracy in mapping
the points and thus the surface reconstruction performance. The experimental results are presented to show the
effectiveness of the proposed method in the improvement of the accuracy of shape reconstruction.
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