MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guide de l'utilisateur télécharger pdf (Page 175)

Feature Extraction

Note In this example, you segment the image using a thresholding

operation that performs best on the Cb channel of the Y’CbCr color space.

5 Use the Selector and Selector1 blocks to separate the Y’ (luminance) and

Cb (chrominance) components from the main signal.

The Selector block se parate s the Y’ component from the entire signal. Set

its block parameters as follows:

• Number of input dimensions =

3

• Index mode = Zero-based

• 1

– Index O ption =

Select all

• 2

– Index O ption =

Select all

• 3

– Index Option =

Index vector (dialog)

– In dex = 1

The Selec to r1 block separates the Cb component from the entire signal.

Set its block parameters as follows:

• Number of input dimensions =

3

• Index mode = Zero-based

• 1

– Index O ption =

Select all

• 2

– Index O ption =

Select all

• 3

– Index Option =

Index vector (dialog)

– In dex = 2

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