Matlab codegen for the Image Processing Toolbox

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I was reading about code generation and I came across these 2 pages and was wondering if there is any difference between the two.
Are they both the same ? That the codegen app just makes it easier to use ? Or does the codegen app only work for Image Processing functions ?
Lastly, I am intending to generate a c++ lib for the watershed function so I was wondering if there is any options that I need to pay attention to if I want the code to run as fast as possible. I will only be passing in image as input to the code.
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RuiQi on 29 Mar 2017
Okay I realized that watershed is only available for codegen for Matlab version R2015a onwards. I am using R2014b.

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Accepted Answer

Steven Lord
Steven Lord on 28 Mar 2017
The first page is in the documentation for MATLAB Coder and discusses how to generate C/C++ code from MATLAB code in general, listing the various options that are available. The examples on that page are small and assume you have already set up your system to generate code.
The second page is in the documentation for Image Processing Toolbox and shows how to generate code from a function that uses Image Processing Toolbox functionality. It shows one example that goes through the whole workflow, from setup to the final generated code.
The documentation for the watershed function does indicate it is supported for code generation, but it also lists some usage notes and limitations at the end of the page.
RuiQi on 29 Mar 2017
Do I need the latest version of matlab ? i am using the R2014b

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