MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guida Utente Scaricare il pdf (Pagina 55)

Working with AVI Files

By setting the Text parameter to 'Text posit ion: Row %d and Column

%d'

, you are asking the block to replace each conv ersion specification

(%d) with a decimal input to the Variables port. You used the Location

parametertospecifywheretoprinteach text string. In this case, the block

places the top-left corner o f the text box that s urrounds the first text string

5 rows down and 10 row s ov er from the top left corner of the image. The

block places the second text string 80 rows down and 10 rows over.

5 Use the Constant block to specify the decimal values input into the Insert

Text block’s Variables port. Because the conversion specification is %d, the

values must be an integer data type. Set the block parameters a s f ollo ws:

• Main pane, Constant value =

[[5 10]' [80 10]']

• Main pane, clear the Interpret vector parameters as 1–D check box.

• Signal Data Types pane, Output data type mode =

uint8

The Insert Text block substitutes the values from the first column of the

Constant value parameter into the first text string a nd the values from

the second column into the second text string.

6 UsetheVideoViewerblockstoview the annotated image. Accept the

default parameters.

7 Connect the blocks as shown in the following figure.

2-15

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 251 252

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MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guida Utente Pagina 55