Structured-Light Based Rapid 3D Measurement of Plant Canopy Structure

Abstract

Density three dimensional plant canopy structure data has numerous applications in agriculture, but many existing 3D data collection approaches are time-consuming. In this paper, we present a measurement system based on structured-light for plant canopy structure data collection. The structured-light projector projects laser beam reflected by dual-oscillating mirror, arrives to the plant canopy, which is captured by a camera. We propose a new scanning mode, that is, during one exposure time of CCD camera, one mirror keeps moving in high frequency and small angle, while the other one maintains the same position, so that we can get a laser stripe rather than a spot in each image, from which about 100 sub-pixel centers of laser stripe can be extracted. Experiments show that the measurement system can rapid collect three dimensional information of the plant.

A Review on Significant Technologies Related to the Robot-Guided Intelligent Bolt Assembly Under Complex or Uncertain Working Conditions

“…SLS-based camera is widely used to measure the depth information due to its simple principle, high accuracy and reliability [8]. In its system, a projector is utilized to firstly project controllable points, lines or planes of light, then the depth and RGB cameras are used to obtain the objective images, and finally calculate the 3D location of the object based on the information fusion of images [9]. TOF-based camera uses sensor to send out near-infrared light and also receive its reflected light, then obtain the depth information of the object through calculating the time or phase differences between two light, and finally show the 3D configuration of the object using different colors to represent different distances.…”