Ultrafast Three-Dimensional Imaging System Based on Phase-Shifting Method and Hybrid Dispersion Laser Scanning

Abstract

In this paper, we proposed an ultrafast 3-D imaging system based on phaseshifting method and a hybrid dispersion scanning technique. The imaging system is capable of acquiring the 3-D shape of the object at an ultrafast scan rate. A theoretical model is built to describe the operation principle of the imaging system and to analyze the performance of the system. In the demonstration, the imaging system is designed with practical devices and components. The system has a scan rate of 25 MHz and a frame rate of 100 kHz. The field of view is 50 "m  50 "m, and the number of pixels of one frame is 260 pixel  1000 pixel. The reconstructed 3-D image has the peak signal-to-noise ratio (PSNR) of 30.11 dB. The performance of the imaging system is investigated by analyzing the influence of the input beam size and the resolution of the digitizer. The input collimated light with large beam size is preferred for high image quality. Moreover, the depth resolution can be improved by using high-resolution digital signal processing.

Three-dimensional surface imaging by multi-frequency phase shift profilometry with angle and pattern modeling for system calibration

“…Depending on the designed pattern, there are a variety of formulation methods [13][14][15][16][17] for phase shift profilometry to calculate the phase and depth. The typical phase shift profilometry [13,14] is formulated as:…”

“…As a result, non-contact 3D surface imaging technology advances rapidly and greatly in the past decades with the stimulation of market demands in industrial community, medical applications and scientific research. The non-contact 3D surface imaging techniques include two main categories based on the reflective characteristics of the surface: (1) techniques to measure the specular surfaces [1][2][3][4][5], and (2) techniques to measure the diffuse surfaces [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Among them, phase shift profilometry is the most popular method due to its overall higher measurement accuracy and measurement efficiency compared to other non-contact 3D surface imaging techniques.…”

“…As a result, they usually differ from the true points considerably. In the past research [15][16][17][18][19][20][21][22], the authors used the measured points instead of the true points to calibrate the camera or the phase shift profilometry 3D imaging systems. Consequently, the ultimate measurement accuracy of these systems could achieve is limited.…”

Reflective Imaging Solved by the Radon Transform

“…The properties of the laser are particularly of interest for imaging landscapes and detecting a specific characteristic like a gas in [9]. Manuscript In this letter, we assume that a laser source emits in the visible or near-infrared band and that the pixels of a focal plane area collect the backscattered intensity; the phase of the backscattered wave is not measured unlike in [10]. Assuming the acquisition monostatic, the scene is illuminated from different positions of the acquisition device providing a collection of 2-D images for several angles of view (see Fig.…”