Pack binary image
Read binary image into the workspace.
BW = imread('text.png'); imshow(BW)
Pack the image.
BWp = bwpack(BW);
Dilate the packed image.
BWp_dilated = imdilate(BWp,ones(3,3),'ispacked');
Unpack the dilated image and display it.
BW_dilated = bwunpack(BWp_dilated, size(BW,1)); imshow(BW_dilated)
BW— Binary image
Binary image, specified as a 2-D numeric or logical matrix.
BWP— Packed binary image
Packed binary image, returned as a numeric matrix of type
bwpack processes the input image pixels by column, mapping groups of 32
pixels into the bits of a
uint32 value. The first pixel in the first row
corresponds to the least significant bit of the first
uint32 element of the
output array. The first pixel in the 32nd input row corresponds to the most significant bit of
this same element. The first pixel of the 33rd row corresponds to the least significant bit of
the second output element, and so on. If
ceil(M/32)-by-N. This figure illustrates how
maps the pixels in a binary image to the bits in a packed binary image.
Usage notes and limitations:
bwpack supports the generation of C
code (requires MATLAB®
Coder™). The code generated for
bwpack uses a precompiled,
platform-specific shared library. Use of a shared library preserves performance optimizations
but limits the target platforms for which code can be generated. For more information, see Types of Code Generation Support in Image Processing Toolbox.