MATLAB: Is it possible to calculate the height of an object in an image by processing its shadow

image processing

An object is placed in the source light, which is at an angle wrt to object. Object's shadow is cast and the scene is captured by a camera.In that case is it possible to calculate the height of the object by processing the shadow of the object in the image with MATLAB?

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If the angle of the light source is known, then dividing the length of the shadow by tan() of the angle will give the height of the object in the same units as the length of the shadow is in.

If the angle of the light source is not known, then No, the shadow does not provide enough information in itself.

Also, you would need an absolute measure somewhere if you want absolute results.

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MATLAB: Fear of shadows

In each case you show above, there is an @ prefix on at least level of a directory involved. The @ prefix is used with the implementation of object oriented classes, and (part from the constructor methods and some static class methods), those .m files are only used when operating on an object of the type named there. For example, @sym/asec.m is only used for sym objects and @single/asec is only used for objects of class "single". So none of what you show there is in conflict with anything. If you notice at the end of each of those lines, it says something "method": that tells you the class name the function is active for.

Now, suppose that

/Users/jrcasey/Documents/MATLAB/Software/cobratoolbox/external/mptoolbox_1.2/@mp/asec.m

had instead been

/Users/jrcasey/Documents/MATLAB/Software/cobratoolbox/external/mptoolbox_1.2/mp/asec.m

without any @. There would then be a risk that the asec function there would be used instead of the routine you expect.

MATLAB: Shadowing built-in functions

I am not using packages either (yet), but I would love to have an alternate version of ADDPATH which would mount folders as packages (basically just generating a name space). It would also be interesting to be able to set MATLAB in a mode where its toolboxes must be "mounted" as packages. E.g.

 janLib   = addpathpack( '/cedric/matlab/libs/JanLib' ) ;
 statTbx  = tbxloadpack( 'Statistics' ) ;
 reg_jan  = janLib.regress( ... ) ;
 reg_stat = statTbx.regress( ... ) ;
 which -all regress
 'regress' not found.

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