MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guida Utente Scaricare il pdf (Pagina 240)

8 Example Applications

Viewing the Comp

ressed Image

In “Compre ssing

an Image” on page 8-11, you compressed an image using

the 2-D DCT and Se

lector blocks. Now, you can use the 2-D IDCT block to

transform the im

agebacktothetimedomainandviewtheresult:

1 If you h ave n ot a

lready done so, define an intensity image in the MATLAB

workspace by ty

ping

I= imread('cameraman.tif');

I is a 256-by-256

matrix of 8-bit unsigned integer values.

2 If the model you created in “Compressing an Image” on page 8-11 is not

open on your desktop, you can open an equivalent model by typing

doc_compression

at the MATLAB command prompt.

3 Use the Block Processing1 b lock to set the size of the submatrices that the

block p asses to the subsystem. Set the Block size parameter to

{[4 4]}.

8-18

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MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guida Utente Pagina 240