The error you are getting is coming from the use of “imresize” function over pixel-label image datastore object i.e. “pximds”. This “pximds” is of datatype ‘table’and resizing a table cannot be done using “imresize” function. The “imresize”function can only resize objects of numerical (‘single’, ‘double’, ‘int8’, ‘int16’, ‘int32’, ‘uint8’, ‘uint16’, ‘uint32’) or “logical” datatypes.
Now, one option here is to do this resize individually “imdsTrain” and “pxds”. But this is possible only for “imdsTrain” which is an image datastore object. In this case, each path stored in “imdsTrain” leads to an image file (where pixels are either ‘double’ or ‘uint8’ type) and hence, it is possible to resize it.
But, “pxds” is the pixel label datastore object, where each saved path leads to a label image where each pixel is saved as a category. Now, logically you cannot resize this categorical array as here the original pixel values of the corresponding categories are not retained anymore. Hence, resizing of label images are not possible.
Here, you can resize your training dataset to the desired dimension (224,224) before labelling is done. After resizing you can generate the pixel labels using “ImageLabeler”. Then, there will be no need of resizing label images in any intermediate step.
