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SVAUG データシート(PDF) 7 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) 7 Page - NXP Semiconductors

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Lens calibration
Surround View Application,
User’s Guide, Rev. 1, 07/2018
NXP Semiconductors
7
4. System settings
Because the keyboard and mouse are used on the target board, their proper setup (mapping) must be
performed before running all the Yocto Linux OS-based applications (capturing, auto_calib, SV3D).
These settings are ignored for the x11 graphical backend, but they are mandatory for the framebuffer or
the XWayland graphical backends. In these cases, it is necessary to define proper keyboard, mouse, and
display devices (events) on the target board.
These settings are recorded in the separate settings.xml file, located in the /App/Content/ folder. This file
contains also other system settings. The default camera configuration and the keyboard and mouse
events are in the <fb> section. These events are read from the /dev/input/by-path/ directory on the SD
card and they are unique for the particular boards.
• <keyboard>—the absolute path of a keyboard device.
• <mouse>—the absolute path of a mouse device.
• <display>—the absolute path of a display device.
To change other parameters (no need for the default camera configuration), see the Surround View
Application Reference Manual [1] for a more detailed description of each section in the settings.xml file.
5. Lens calibration
5.1. Image capturing
For a proper lens (intrinsic camera) calibration, the image capturing for each separate camera must be
done first. Use a chessboard calibration pattern for this (see Figure 5). The original PDF pattern file is
located at Tools/CalibPatterns/patternLensCameraCalibration.pdf.
Figure 5. Lens calibration pattern
You may also print your own pattern on an A4 or A3 paper and place it on a piece of cardboard. There
must be a thick white border around the pattern. This white border is needed by the “Automatic
Checkerboard Extraction” tool to facilitate the corner extraction (see Section 5.2, “Camera intrinsic
parameters estimation tool”).
The application sources to build this application are available on the NXP webpage [3]. Use the camera
image capturing application (binary file) with a right parameter (1-4) for these purposes:
• /Tools/CamCapture/capturing 1—capture the first camera frames.
• /Tools/CamCapture/capturing 2—capture the second camera frames.
• /Tools/CamCapture/capturing 3—capture the third camera frames.


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