MATLAB: How to log metadata (skeletal tracking data) while logging color video and depth video to disk when using Kinect for Windows v1

Image Acquisition Toolbox

I am trying to log the skeletal tracking metadata in addition to logging the color and depth sensor data to video files.

I can use the videoinput DiskLogger functionality to log to disk, however the skeletal tracking metadata is not saved.

Is there any way to also log the skeletal metadata?

Best Answer

The functionality offered by videoinput DiskLogger logs only the frame data to disk and does not include the metadata associated with the color or depth sensors.

The skeletal tracking information is provided as part of the Kinect depth sensor frame metadata returned by the getdata function. In order to get access to this metadata while also logging to disk, the videoinput LoggingMode for the depth sensor should be set to 'disk&memory'.

Refer to the attached MATLAB example code ("example_log_videos_depthmetadata.m" and "getDepthMetadata.m") for a simple finite duration acquisition configuration which:

logs the color frames to a 'Uncompressed AVI' video file
logs the depth frames to a 'Archival' (Motion JPEG 2000 file with lossless compression .MJ2) video file, which supports a bit-depth higher than 8 bits.
logs the depth sensor metadata (including the skeletal tracking metadata) to a .MAT file

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MATLAB: How to simultaneously acquire images and save them to disk as TIFF files

Refer to attached "basic_gige_log_TIFF.m" and "basic_saveImageData.m" for a simple example on how to simultaneously acquire images and save them to disk as TIF files.

Since saving each acquired frame to disk uses imwrite, which is a blocking MATLAB function, at higher frame rates or higher frame sizes, the image file writing operation might not be able to keep up with the acquisition, resulting in an acquired frames backlog and increased memory usage.

In this situation, if Parallel Computing Toolbox is available, there is an option to improve performance by doing the file writing operation in a separate worker using parfeval.

Refer to attached "*gige_log_parfeval.zip*" which includes:

example code "gige_log_TIFF.m" and required functions "saveImageData.m", "writeTIFF.m", and "checkFuturesErrors.m"
example code "basic_gige_log_TIFF.m" and required functions "basic_saveImageData.m" and "writeTIFF.m", which does not use Parallel Computing Toolbox. This is included for comparison with the example which uses parfeval.

MATLAB: Log log plot

Try this code:

plot(log2(rand(100,1)*128))
ytick = get(gca, 'YTick')
str = cellstr( num2str(ytick(:),'2^{%d}') )
format_ticks(gca,' ',str)

format_ticks function you can download from:

http://www.mathworks.com/matlabcentral/fileexchange/15986

Best Answer

Related Solutions

MATLAB: How to simultaneously acquire images and save them to disk as TIFF files

MATLAB: Log log plot

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