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SVAUG データシート(PDF) 10 Page - NXP Semiconductors

部品番号. SVAUG
部品情報  Surround View Application
ダウンロード  21 Pages
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メーカー  NXP [NXP Semiconductors]
ホームページ  http://www.nxp.com
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SVAUG Datasheet(HTML) 10 Page - NXP Semiconductors

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Lens calibration
Surround View Application,
User’s Guide, Rev. 1, 07/2018
10
NXP Semiconductors
5.2.3. Extraction of grid corners
The extraction of grid corners is the most important phase of the calibration, as the calibration results
depend on the position of the checkerboard corners in each image.
Click the “Extract grid corners” button. A dialog box with the default values appears (see Figure 9).
Figure 9. OCamCalib
“Extract corners” menu
First, type the number of inner squares present along the X and Y directions. This number is lower by 2
than the actual number of the square along each direction in the checkerboard, because only the inner
squares are considered. In case of the default (included) calibration pattern, type “6” for the number of
squares along both the X and Y directions (see Figure 9).
Second, fill the actual size of the squares. In this case (for instance), it is 29 mm in both the X and Y
directions.
The checker size is only used to recover the absolute positions of the checkerboards. For the intrinsic
parameters, this is not needed and you may leave this field as it is.
In the last two prompts, the toolbox asks for the position (rows, columns) of the center of the
omnidirectional image. Because the OcamCalib toolbox can automatically determine the location of the
center, you can leave the default values (height/2 and width/2). This is not important, because you are
going to use the “Find center” button later to find the correct position of the center. However, you may
optionally specify the location of the center and refine it later using the “Find center” button.
After submitting the parameters, the corners are automatically extracted and the results of the extraction
are displayed.


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