MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guide de l'utilisateur télécharger pdf (Page 170)

7 Analysis and Enhancement

• 1

– Index Option =

Index vector (dialog)

– In dex = 0

• Inputportsize= 2

Set the Selector1 block parameters as follows :

• Index mode =

Zero-based

• 1

– Index Option =

Index vector (dialog)

– In dex = 1

• Inputportsize= 2

11 Use the Variable Selector blocks to index into the rho and theta vectors and

determine the rho and theta values that correspond to the longest line in

the original image. Set the parameters of the Variable Selector blocks as

follows:

• Select =

Columns

• Index mode = Zero-based

12 Use the Hough Lines block to determine where the longest line intersects

the edges of the original image. You use these coordinates to superimpose

a white line on the original image. Set the Sine value computation

method to

Trigonometric function.

13 Use the Draw Shapes block to draw a white line over the longest line on the

original image. Set the block parameters as follows:

• Shape =

Lines

• Border value = White

14 Use the Video Viewer block to display the original image with a white

line superimposed over the longest line in the image. Accept th e default

parameters.

15 Connect the blocks a s shown in the following figure.

7-14

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MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guide de l'utilisateur Page 170