MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guide de l'utilisateur télécharger pdf (Page 176)

7 Analysis and Enhancement

6 Use the Submatrix and Submatrix1 blocks to crop the Y’ and Cb matrices

to a particular region of interest (ROI). This ROI contains two beams that

are at an angle to each other. Set the parameters as follows:

• Starting row =

Index

• Starting row index = 66

• Ending row = Index

• Ending row index = 150

• Starting column = Ind ex

• Starting column index = 325

• Ending column = Inde x

• Ending column index = 400

7 Use the Edge Detection block to find the edges in the Cb portion of the

image. This block outputs a binary image. Set the Threshold scale factor

parameter to

8 Use the Hough Transform block to calculate the Hough matrix, which gives

you an indication o f the presence of lines in an image. Select the Output

theta and rho values check box as shown in the following figure.

Note In step 11, you find the theta and rho values that correspond to the

peaks in the Hough matrix.

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MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guide de l'utilisateur Page 176