MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guide de l'utilisateur télécharger pdf (Page 152)

6 Morphological Operations

The stre l function creates a circular STREL object with a radius of 15

pixels. When working with the Openi ng block, pick a STREL object tha t

fits within the objects you want to keep. It often takes experimentation to

find the n eig hbo rhood or STREL object that best suits your application.

8 Use the Video Viewer1 block to view the background estimated by the

Openin g block. Accept the default parameters.

9 Use the first Sum block to subtract the estimated background from the

original image. Set the block parameters as follows:

• Icon shape =

rectangular

• List of signs = -+

10 Use the Video Viewer2 block to view the result of subtracting the

background from the original image. A ccept the default parameters.

11 Use the Constant block to define an offset value. Set the Constant value

parameter to

80.

12 Use the Data Type Conversion block to convert the offset v alue to an 8-bit

unsigned integer. Set the Outp ut data type mode parameter to

uint8.

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MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guide de l'utilisateur Page 152