How can I export .mkv file containing depth data to .ply file?

I am planning to output 4 minutes of depth data as a .mkv file recorded using kinect as a ply file.

I saw on the following page how to connect kinect directly and read the point cloud, but I couldn't figure out how to read the point cloud from the mkv file that is already output.Kinect for Windows からの点群 - MATLAB pcfromkinect - MathWorks 日本

I would appreciate it if you could tell me how to do this.

Answer 1

[praguna manvi]

Hi @海志,

As I understand it, you already have the video containing depth frames, which can be extracted using the “VideoReader” function. You can refer to this link for more information:

https://www.mathworks.com/matlabcentral/answers/487873-how-can-i-upload-a-mkv-file-onto-matlab.

The depth frames can be visualized as a point cloud using the “pcfromdepth” function directly as follows:

ptCloud = pcfromdepth(depthImage,depthScaleFactor, intrinsics, ... 
    ColorImage=colorImage, ... 
    DepthRange=[0 maxCameraDepth]); 

More infomation on “pcfromdepth” function can be found at this link:

https://www.mathworks.com/help/vision/ref/pcfromdepth.html

Hope this helps !