Source code for the insertText function uses checkImage(I) and RGB = convert2RGB(I) but checkImage and convert2RGB do not exist as functions

When looking at the input image for the function insertText(), the function has these three lines of code

%--input image--
checkImage(I);
RGB = convert2RGB(I);
inpClass = class(I);

But I looked for the function checkImage() and the function convert2RGB, and they don't exist in my version of matlab, nor do they show up in the documentation online. This is the reason my insertText() function isn't working. Is it something to do with my version of Matlab, 2014a, or is there something wrong with the function?

Thanks!

[Pulkit Malik]

Nevermind, saw that these are functions in the source code itself