Using the auxiliary camera for system calibration of 3 D measurement by digital speckle
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Representative images taken with medical doses are shown and illustrate the potential use for portable basic radiography. The primary advantages of the method are portability, robustness, digital imaging and low cost the limitations are the low detective quantum efficiency and hence signal-to-noise ratio for medical doses, and restricted range of plate sizes. The detective quantum efficiency has been determined using a radioisotope source and is comparatively low at 0.017 for the CMOS camera and 0.006 for the CCD camera, attributed to the poor light harvesting by the lens. The modulation transfer function for the CsBr:Eu2+ plate is bimodal, with a high frequency wing which is attributed to the light-guiding behaviour of the needle structure. The modulation transfer function for both systems has been determined and falls to a value of 0.2 at around 2 lp/mm, and is limited by light scattering of the emitted light from the storage phosphor rather than the optics or sensor pixelation. Both systems are tested with 240 x 180 mm cassettes which are based on either powdered europium-doped barium fluoride bromide or needle structure europium-doped cesium bromide. We compare the performance of (i) a Canon 5 D Mk II single lens reflex camera with f1.4 lens and full-frame CMOS array sensor and (ii) a cooled CCD-based camera with a 1/ 3 frame sensor and the same lens system. The possibility of using the combination of a computed radiography (storage phosphor) cassette and a semiprofessional grade digital camera for medical or dental radiography is investigated.
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It comes to prove that this method is reliable. This method adds a distortion model of digital camera to traditional DLT algorithm, after repeating iteration, it can solve the inner and external position element of the camera as well as the joint calibration of 3 D laser scanner and digital camera. A method to joint calibrate 3 D laser scanner and digital camera based on Direct Linear Transformation algorithm was proposed. Joint Calibration of 3 d Laser Scanner and Digital Camera Based on Dlt AlgorithmÄesign a calibration target that can be scanned by 3 D laser scanner while shot by digital camera, achieving point cloud and photos of a same target.