MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guide de l'utilisateur télécharger pdf (Page 27)

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:

1-19

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 251 252

Pas de commentaire

MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guide de l'utilisateur Page 27