Semi‐automatic reconstruction of object lines using a smartphone’s dual camera

Abstract

In this paper, the possibility of reconstructing object lines using a smartphone's rear dual camera (wide-angle and telephoto) was examined through designing a semi-automatic system. After calibrating both cameras, six scenes for each of three objects were captured and rectified. Object lines were categorised into six groups based on the distance and angle to the dual camera system. Image lines were extracted using the linear Hough transform technique and points of intersection detected. Stereo pairing of conjugate points then allowed the calculation of object coordinates and the lengths of object lines were compared to their lengths measured by a digital caliper. The best line reconstruction results were achieved with the smallest distance and angle to the dual camera system.

Implementation of the Smartphone Camera in the Measures of Narrow Street Facades

“…The smartphone's camera is calibrated applying Zhang's technique for camera calibration using chessboard pattern (Zhang, 2000;Burger, 2019;Aldelgawy & Abu-Qasmieh, 2021a, 2021b. A number of images changing the angles of view is captured for a well-calibrated chessboard pattern.…”