[Gridflow-dev] cv.Div, cv.Mul + errors

Mathieu Bouchard matju at artengine.ca
Thu Oct 25 21:00:24 EDT 2007

On Thu, 25 Oct 2007, Alexandre Castonguay wrote:

> Thank you for the explanations, your fixes to the variable grid sizes 
> solved it but it's true a more permanent fix for future error handling 
> is preferable.

It's also possible that all CV errors are better handled by predicting 
them and raising GF errors instead. In that case we don't need a permanent 

It's also possible that not all CV errors are easy to predict or possible 
to predict. In that case I will have to make a permanent fix.

Anyway, OpenCV has a mechanism for error-checking most any CV call. This 
is one of the ways to implement exception-like mechanisms, but the problem 
with that is that every CV call has to be checked with an extra statement. 
From within C++, without rewriting the CV headers, every call has to be 
accompanied. With a helper function it can be made to look like:

     cvFoo(blah,blah,blah); check();

and with a macro it can be made to look like:

     CHECK cvFoo(blah,blah,blah);

which is probably not a big deal if we have a very good search-and-replace 
tool or that I do it incrementally (with some discipline and 

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| Mathieu Bouchard - tél:+1.514.383.3801, Montréal QC Canada

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