For function definitions, you need to have variable names for the input argument list, not explicit values. E.g., this line
function runSaliency('AloeR_SLIC.jpg')
should look something like this instead
function runSaliency(image_file_name)
where image_file_name is the name of the input variable to the function.
Then downstream in your code, this stuff
if (isa('AloeR_SLIC.jpg','struct'))
img = 'AloeR_SLIC.jpg';
should look something like this instead
if (isa(image_file_name,'struct'))
img = 'AloeR_SLIC.jpg';
