4 dimensional Mat in opencv JAVA

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Dnn.blobFromImage will take in as input a 625x1 Mat and output 1x1x625x1 not 1x625x1x1.

That is the whole problem. The second dimension is number of channels. blobFromImage can output only 1(for gray scale image) or 3 channels(for RGB image) not 625.

so, please edit your question, describe, how you get to that (very weird) format and let's see again ?

So what I thought was that maybe I can make a 4D Mat myself and pass it as input to caffemodel. But I don't know how to create and operate upon a 4D Mat. It can be done in C++ opencv. But there is no constructor in Java for a multidimensional Mat

That wierd 1x625x1x1 format is the dimension of an input blob as given in the .prototxt file.

https://github.com/CSAILVision/GazeCa...

Check the input called "facegrid" in this file

yea, true. being restricted to java is somewhat unfortunate here.

but again it's unclear, how you got that data into a Mat (please show us !)

maybe something can be done, using reshape

forget the latter, opencv is limited to 512 possible channels

The facegrid input of the model is made like this: You have a 25x25 image of a person with a 12x12 bounding box around the face. You declare a 25x25 Mat object and fill it with ones wherever there is a face(inside the bounding box) and zeros wherever there is no face. So the 25x25 Mat will have ones inside the bounding box and zeros everywhere else. The you flatten the Mat to 625x1.

See this @berak

https://codeshare.io/adjzq4

One more thing, can we make 1x1x1 Mat objects and then use merge to stack 625 of such objects?