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Pack binary image


BWP = bwpack(BW)


BWP = bwpack(BW) packs the uint8 binary image BW into the uint32 array BWP, which is known as a packed binary image. Because each 8-bit pixel value in the binary image has only two possible values, 1 and 0, bwpack can map each pixel to a single bit in the packed output image.

bwpack processes the 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 BW is M-by-N, then BWP is ceil(M/32)-by-N. This figure illustrates how bwpack maps the pixels in a binary image to the bits in a packed binary image.

Binary image packing is used to accelerate some binary morphological operations, such as dilation and erosion. If the input to imdilate or imerode is a packed binary image, the functions use a specialized routine to perform the operation faster.

Use bwunpack to unpack packed binary images.

Code Generation

bwpack supports the generation of efficient, production-quality C/C++ code from MATLAB. Generated code for this function uses a precompiled platform-specific shared library. To see a complete list of toolbox functions that support code generation, see List of Supported Functions with Usage Notes.

Class Support

BW can be logical or numeric, and it must be 2-D, real, and nonsparse. BWP is of class uint32.


Pack, dilate, and unpack a binary image:

BW = imread('text.png');
BWp = bwpack(BW);
BWp_dilated = imdilate(BWp,ones(3,3),'ispacked');
BW_dilated = bwunpack(BWp_dilated, size(BW,1));

See Also

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