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you can try to reshape() your 4d blob to a 2d one.

Mat m2 = oBlob.reshape(1, 8 * 45); // assuming W=45, H=80, and C=8

this should result in a Mat with 1 channel, 45 cols and 8*80 rows. (8 planes, stacked on top of each other)

you can now access a single plane easily using submat:

// 2nd plane:
Mat m = m2.submat(80,80+80, 0,45);

you can try to reshape() your 4d blob to a 2d one.

Mat m2 = oBlob.reshape(1, 8 * 45); 80); // assuming W=45, H=80, and C=8

this should result in a Mat with 1 channel, 45 cols and 8*80 rows. (8 planes, stacked on top of each other)

you can now access a single plane easily using submat:

// 2nd plane:
Mat m = m2.submat(80,80+80, 0,45);