Create label matrix from bwconncomp structure
L = labelmatrix(CC)
L = labelmatrix(CC) creates a label matrix from the connected components structure CC returned by bwconncomp. The size of L is CC.ImageSize. The elements of L are integer values greater than or equal to 0. The pixels labeled 0 are the background. The pixels labeled 1 make up one object; the pixels labeled 2 make up a second object; and so on. The class of L depends on CC.NumObjects, as shown in the following table.
256 CC.NumObjects 65535
labelmatrix is more memory efficient than bwlabel and bwlabeln because it returns its label matrix in the smallest numeric class necessary for the number of objects.
CC is a structure returned by bwconncomp. The label matrix L is uint8, uint16, uint32, or double.
Calculate the connected components and display results:
BW = imread('text.png'); CC = bwconncomp(BW); L = labelmatrix(CC); L2 = bwlabel(BW); whos L L2
The output for whos appears as follows:
Name Size Bytes Class Attributes L 256x256 65536 uint8 L2 256x256 524288 double
The output for imshow appears as follows: