MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Betriebsanweisung PDF herunterladen (Seite 165)

Feature Extraction

17 Run your model again.

Your model runs faster because the Edge D etection block is more efficient

when you clear the Edge thinning check box. However, the edges of rice

grains in the Video Viewer window are wider.

You have now used the Edge Detection block to find the object boundaries in

an image. For more inform ation on this block, see the Edge Detection block

reference page in the Video and Image Processing Blockset Reference.

Finding Lines in Images

Finding lines within images enables you to detect, measure, and recognize

objects. In this section, you use the Hough Transform, Find Lo cal Maxima,

andHoughLinesblockstofindthelongestlineinanimage.

1 Define an intensity image in the MATLAB workspace. At the MATLAB

command prompt, type

I= imread('circuit.tif');

I is a 280-by-272 matrix of 8-bit unsigned integers.

2 To view the image, at the MATLAB com m and prom pt, type

7-9

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MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Betriebsanweisung Seite 165