Real-time acquisition of depth and color images using structured light and its application to 3D face recognition

Ultra High-speed 3-dimensional Profilometry Using a Laser Grating Projection System

“…Since the PM was revolving 10,000 times per minute, the measurement time is found to be as small as 2.572 ms, which is ~10 times shorter than those of the previous research [11,12,20,21].…”

“…Accordingly, there have been many technologies developed to improve the qualities of 3D shape measurement [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The fringe pattern projection method based on the phase-shifting technique has been considered very effective for its high speed and accuracy [10,[13][14][15].…”

“…The fringe pattern projection method based on the phase-shifting technique has been considered very effective for its high speed and accuracy [10,[13][14][15]. Especially the digital fringe projectors (LCD, DMD, or Polygon-mirror type) have great flexibility in generating fringe patterns since the patterns can be controlled easily by a computer program [12,15,16].…”

A High-speed Digital Laser Grating Projection System for the Measurement of 3-dimensional Shapes

“…To reduce the measurement time, researchers have developed key technologies like rapid processing of image data [11] and combination of optical patterns [12]. Today it is generally accepted that the fringe pattern projection method with the phaseshifting technique is the most effective way to obtain 3D shape with high accuracy and speed [10,[13][14][15].…”

“…When the digital projector such as LCD or DMD is used to generate patterns [8,12,15,16], there is practically no phase error and it is convenient to change the patterns since the patterns are provided by computer program. However, there is rather long time required to transmit the 2-dimensional image data from the computer to the digital projector, because of the response time of the LCD (or DMD) and the large amount of image data.…”