User`s guide

Key Blockset Con cepts
If you a re working with a block that only outpu ts multidimensional arrays,
you can use the Selector block to separate the color planes. For an example of
this process, see “Measuring an Angle Between Lines” on page 7-17. If you are
working with a block that only accepts m ultidimensional arrays, you can use
the Matrix Concatenation block to create a multidimensional array. For an
example of this process, see “Finding the Histogram of an Image” on page 7-59.
Coordinate Systems
You can s pecify locatio n s in images using vario u s coordinate systems. This
topic discusses pixel coordinates and s patial coordinates, which are the two
main coordinate systems used i n Video and Image Processing Blockset.
Pixel Coordinates
Pixel coordinates enable you to s pecify locations in images. In this coordinate
system, the image is treated as a grid of discre te elements, ordered from top
to bottom and left to right, as shown in the following f igure:
0
0
1
1
2
2
r
c
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