structure tensor - introduction and tutorial

Comprehensive intro to structure tensors both in 2D and 3D

Description

Tutorial on structure tensors. Normally associated with image processing and structure inference, this code provides a completely encapsulated package to explain and demonstrate the use of structure tensors.

playshow structureTensorDemo

or use the html to properly visualize the LaTeX equations.

• Required Products: Image Processing Toolbox
• MATLAB release: MATLAB 7.0.1 (R14SP1)

[dong huang]

>> structureTensorDemo
Isotropic Case: Directional Derivative Magnitude=0.000000
Uniform Color Case: Directional Derivative Magnitude=0.000000
Note how the coherence measure is different for each case
Isotropic case coherence:0.000000
Uniform color case coherence:1.000000
??? Undefined command/function 'voxel_plot'.

Error in ==> visualize_3D_data at 30
               voxel_plot([c,r,d],vColor, 1-data(c,r,d));

Error in ==> structureTensorDemo at 341
    visualize_3D_data(stepPlaneData);

[Emilio Gomez]

??? Error using ==> quiver
Too many input arguments.

Error in ==> C:\MATLAB6p5\work\ST_pub\structureTensorDemo.m
On line 81 ==> quiver(midpt, midpt, cU, cV, midpt, 'r', 'LineWidth', 5, 'MaxHeadSize', 5);

[S Arseneau]

Emilio,
I believe that your issue may be that you are using an older version of MatLab as I see from your directory path that you are using MatLab 6. To provide a quick fix, I suggest looking at your local help file (which should still have your appropriate function parameters) for 'quiver'. Otherwise, I suggest re-coding the source to:
quiver(midpt, midpt, cU, cV);
This won't have any of the cool visualization, but I suspect it may work for your version of MatLab. You can also try to re-code based on the premise that the current version of quiver works as follows:
quiver(xpos, ypos, xMagnitude, yMagnitude, scaleFactor, lineSpec, ...);

Hope that this helps you out.

[Ben Kang]

Great jobs!

[Lin Naiyang]

 

[bo]

nice work