CHAPTER 6. COIN CALIPER I
41
4
Determine as accurately as possible the diameters of the coins you have
available. Precision calipers would be appropriate, if available, otherwise search
the Internet for the specifications of your coins. Tabulate the diameters of each
of your coin denominations.
5
Follow along with the video
Step 1: Obtain Representative Images
to
learn how to acquire representative coin images in the stand-alone version of
NI Vision Assistant; select Windows “Start” and then select “All Programs |
National Instruments | Vision | Vision Assistant.” Adjust your webcam setup
to obtain images similar to those presented in the video, and choose a video
mode with reasonably high resolution. Remember to set the focus to manual.
T
IP
:
The NI Vision Assistant “Acquire Images” tab defaults to “This
Computer” as the target device and displays a list of all desktop-connected
cameras from which you can choose. You can also access cameras con-
nected to NI myRIO within Vision Assistant: Choose “Select Network
Target” instead of “This Computer” and then enter the IP address as either
172.22.11.2
when myRIO is connected by its USB cable or the IP
address associated with myRIO by the wireless network.
6
Collect images of at least five different coins and at least three additional
images of the same coin denomination (to evaluate measurement repeatability).
Also collect an image of a metric ruler as a calibration target. Record the video
mode and camera settings that you adjusted. Capture a screenshot of the Vision
Assistant image browser that shows all of your images at once.
7
Remember to save all of your images to disk.
Calibrate the camera
8
Follow along with the video
to learn how
to perform “Point Distance Calibration,” the simplest available calibration that
ignores lens distortion and other non ideal effects. Calibrate the camera in the
center of the image where the coins will be placed.
(4:21)
(3:04)
Содержание NI myRIO
Страница 1: ...Ed Doering NI myRIO Vision Essentials Guide...
Страница 2: ......
Страница 11: ...Part I Machine Vision Fundamentals...
Страница 12: ......
Страница 31: ...Part II Introductory Machine Vision Projects...
Страница 32: ......
Страница 38: ...32 CHAPTER 4 CAMERA SETUP...
Страница 44: ...38 CHAPTER 5 STEREO VISION...
Страница 61: ...Part III Machine Vision Application Projects...
Страница 62: ......
Страница 72: ...66 CHAPTER 8 COIN COUNTER...
Страница 85: ...CHAPTER 10 KEYED OPTICAL LOCK 79 Figure 10 3 Typical expected results for the Geometric Matching step...
Страница 86: ...80 CHAPTER 10 KEYED OPTICAL LOCK...
Страница 92: ...86 CHAPTER 11 DMM TEST STAND...
Страница 134: ...128 CHAPTER 17 MARBLE SORTER...
Страница 135: ...Part IV Appendices...
Страница 136: ......
Страница 143: ...B MXPandMSPConnectorDiagrams Figure B 1 MXP myRIO eXpansion Port connector diagram...
Страница 144: ...138 APPENDIX B MXP AND MSP CONNECTOR DIAGRAMS Figure B 2 MSP miniSystem Port connector diagram...
Страница 148: ...142 APPENDIX D BUILD A STAND ALONE APPLICATION...
Страница 149: ...E MarbleSorterConstructionDetails To be continued...
Страница 150: ...144 APPENDIX E MARBLE SORTER CONSTRUCTION DETAILS...