Use matrix convolution for the creation of buffers

[kais-siala]

Currently, the code creating buffers is quite long. I am sure it can be done easily with matrix convolution. Check:

• https://de.mathworks.com/matlabcentral/answers/395258-most-efficent-way-of-finding-submatrices-of-a-matrix
• https://stackoverflow.com/questions/43373521/how-to-do-convolution-matrix-operation-in-numpy