Can't find this function - RegionPropertiesALX

While trying to run an open source camera tracking program in Matlab, I get this error:

??? Error using ==> RegionPropertiesALX
Error Message: Internal Error: Dynamic cast faild

Error in ==> regionprops at 17
stats = RegionPropertiesALX(varargin{:});

I can find regionprops in the image toolbox, but regionprops just calls RegionPropertiesALX, which I can't find. Am I not supposed to be able to find this function, or is it missing and this is causing the error? Does anyone know how to fix a dynamic cast error?

Thanks, Jessica

[Image Analyst]

Sounds like your installation of the Image Processing Toolbox may be corrupted because it should contain everything you need - everything that included functions such as regionprops needs. Call the Mathworks for more help. Should be free since it seems to be an installation issue to me.

Answer 1

[Walter Roberson]

In 2008b, regionprops.m has far more than 17 lines of help information and so line 17 is much too early in the file to be executable code.

Please try

>> which -all regionprops

The path shown should end in something like

toolbox/images/images/regionprops.m

[JM]

Thanks - I have MATLAB version R2011b, and regionprops is a function with only one line of executable code, which is

stats = RegionPropertiesALX(varargin{:});

So I think something is wrong with RegionPropertiesALX. But it's a .mexw32 file and I don't know how to fix it.

[Walter Roberson]

Does "which" show a path similar to the above?

I do not have the R2011b pre-release to test with.

[JM]

Yeah, the path looks right. I'm still trying to figure out the error.