User`s guide

5 Geometri c Transformation

Rotating an Image

YoucanusetheRotateblocktorotateyourimageorvideostreambya

specified angle. In this exampl e, you le arn how to use the R otate block to

continuously rotate an image:

1 Define an R GB image in the MATLAB workspace. At the MATLAB

command prompt, type

I = checker_board;

is a 100-by-100-by-3 array of double-precision values. Each plane of the

array represents the reg, green, or blue color values of the image.

2 To view the image this matrix represents, at the MATLAB command

prompt, type

imshow(I)

3 Create a new Simulink model, and add to it the blocks shown in the

following table.

Block Librar y Quantity

Image From

Workspace

Video and Image Processing

Blockset > Source s

5-6