A Cross-Line Structured Light Scanning System Based on a Measuring Arm

Round 1

Reviewer 1 Report

Tai et al. shows to improve the scanning efficiency using two-laser system. This topic is interesting. However, the manuscript needs more efforts to be publishable.

Major comments:

1.       Figure 3 needs to be reworked. The line colors of laser A and B can be different to make the figure clearer. Besides this, what are two dash lines on the right side of the figure.

2.       Line 108, the authors said the algorithm is not suitable for FPGA which has a very good temporal resolution. However, the reasons are needed to support this statement. Is this due to the complexity of the algorithm or any other reasons?

3.       Please check line 224 to 228. Figure 15 and 16 are not properly described.

4.       In the conclusion, the authors are trying to state that the instrument is better, however, there isn’t enough information for the readers to achieve this point. First, the manuscript only mentioned 80 FPS, is this the fast frame rate or the optimized one?  What kind of camera is using here? Besides this, author also needs to provide the typical scanning rate or efficiency of other methods in the manuscript so that the readers can make the comparison directly.

Minor comments:

1.       Equation 3,  the element on the bottom right should be Yc/Zc.

2.       Line 244, “the frame rate was 1.33 times that when using single-line structured light” to “the frame rate was 1.33 times faster than single-line structured light.

Author Response

The attachment is revised manuscript. Here are the responses.

Reviewer 1

Major comments:

1. Figure 3 needs to be reworked. The line colors of laser A and B can be different to make the figure clearer. Besides this, what are two dash lines on the right side of the figure.

       Use red and black colors to make figure clearer;

      The two dash lines mean that there are other frames subsequently are deleted in order to avoid misunderstanding.Now ,had deleted;

2. Line 108, the authors said the algorithm is not suitable for FPGA which has a very good temporal resolution. However, the reasons are needed to support this statement. Is this due to the complexity of the algorithm or any other reasons?

      VHDL of FPGA is not suitable for floating point operations. The algorithm is full of floating operations;

3. Please check line 224 to 228. Figure 15 and 16 are not properly described.

       redescribe  figure 15 and 16:

       Figure 15(right) shows  point clouds obtained from white flat board. Fit all points to a plane, and the distances from all points to the plane were calculated. The statistical histogram shown in Figure 16 was obtained. The horizontal axis represents the distance (in mm), while the vertical axis stands for the distribution of the numbers of points. 96% points are distributed within +/− 0.05 mm. The main deviation was due to the hand–eye calibration;

4. In the conclusion, the authors are trying to state that the instrument is better, however, there isn’t enough information for the readers to achieve this point. First, the manuscript only mentioned 80 FPS, is this the fast frame rate or the optimized one?  What kind of camera is using here? Besides this, author also needs to provide the typical scanning rate or efficiency of other methods in the manuscript so that the readers can make the comparison directly.

      In the conclusion,Under the same camera conditions, the frame rate of 3D point cloud is improved by using cross structured laser. We show the result in fig14;

     80FPS is the fastest frame rate acquired based on the work resolution. On 3.1 (2) (b);

    Camera is insustrial 2D camera on conclusion;

    Comparison in fig14 directly;

Minor comments:

1. Equation 3,  the element on the bottom right should be Yc/Zc.

       Yes,Sorry.Right is Yc/Zc;

2. Line 244, “the frame rate was 1.33 times that when using single-line structured light” to “the frame rate was 1.33 times faster than single-line structured light.

       the frame rate was 1.33 times that when using single-line structured light;

Author Response File: Author Response.docx

Reviewer 2 Report

The authors in this paper propose a new  comprehensive scanning measurement system, using a measuring arm and  two single line structured lights. The paper is well written, but I have some comments to be addressed before to accept it to publication.

1) in Figure 1 is not clear where the two laser systems are mounted, it could be an idea to join the picture of the system presented in Fig. 6 with Fig 1.

2) Is it possible to have more details on the lasers?

3) I missed the spatial resolution of the system. Can the authors say something about that?

Author Response

 The attachment is revised manuscript. Here is the response.

Reviewer 2

1) in Figure 1 is not clear where the two laser systems are mounted, it could be an idea to join the picture of the system presented in Fig. 6 with Fig 1.

Show the details that two lasers system and camera are mounted;

2) Is it possible to have more details on the lasers?

   On Figure 8,Calibration of the camera. Laser B is fixed by hot glue;

   And add laser information and spatial resolution about 3D camera based on lasers. on paper 3.1(3);

3) I missed the spatial resolution of the system. Can the authors say something about that?

    And add laser information and spatial resolution about 3D camera based on lasers. on paper 3.1(3);

Author Response File: Author Response.docx

Round 2

Reviewer 1 Report

It looks good to me.