MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guia do Utilizador descarregar pdf (Página 168)

7 Analysis and Enhancement

5 Use the Image From Workspace block to import your image from the

MATLAB workspace. Set the Value parameter to

6 Use the Edge Detection block to find theedgesintheintensityimage. This

process improves the efficiency of the Hough Lines block as it reduces the

image area over wh ich th e block sear ches for lines. The block also converts

the image to a binary image, which is the required input for the Hough

Transform block. Accept the default parameters.

7 UsetheVideoViewerblocktodisplay the edges found by the Edge

Detection block. Accept the default parameters.

8 Use the Hough Transform block to compute the Hough matrix by

transforming the input image into the rho-theta parameter space. The

block also outputs the rho and theta values associated with the Hough

matrix. Set the block parameters as follows:

• Theta resolution (radians) =

pi/360

• Select the Output theta and rho values check box.

7-12

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MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guia do Utilizador Página 168