National Instruments NI myRIO, Essentials Manual

Page: 159 / 163

APPENDIX F. VIDEO TUTORIAL LINKS 153
Grayscale Images
•
Find Energy Center (Centroid)
72
– Find the X-Y coordinates of the energy
center (centroid) of an image.
• Suppress Highlights
73
– Use the “Grayscale | Operators” with “Min”
option to suppress the highlights (hotspots) in a grayscale image. Pixel
intensitiies that exceed a threshold are clipped to that threshold value.
• Threshold Grayscale to Binary
74
– Threshold a grayscale image to binary
using manual or automatic threshold selection.
•
Dual-Threshold Grayscale to Binary
75
– Threshold a grayscale image to
binary using manual mode with dual (low and high) thresholds.
Identification
•
EAN-13 (UPC-A) Barcode Reader
76
– Read EAN-13 (UPC-A) barcodes.
•
Code-39 Barcode Reader
77
– Read Code-39 barcodes; demonstrate how to
acquire images within the stand-alone version of Vision Assistant.
• OCR (Optical Character Recognition) Training
78
– Train the OCR reader;
demonstrate how to acquire images within the stand-alone version of
Vision Assistant.
• QR Code Reader
79
– Read QR codes (2-D barcodes); demonstrate how to
acquire images within the stand-alone version of Vision Assistant.
Calibration, Real-World Units, and Coordinate Systems
•
Two-Point Calibration from a Ruler
80
– Set up a 2-point calibration from
an image of a ruler to convert measurements in pixels into real-world
units such as millimeters.
72
http://youtu.be/XkYfR141x0k
(0:57)
73
http://youtu.be/XJaMjKxjLoo
(1:45)
74
http://youtu.be/7fJBS6_neQY
(3:08)
75
http://youtu.be/0TFh4zB6e3Y
(1:56)
76
http://youtu.be/hLSla3C-6V4
(1:29)
77
http://youtu.be/iT8FAzkSksE
(2:29)
78
http://youtu.be/KxRSL3jnIAk
(5:04)
79
http://youtu.be/8LTx9N0R8_g
(2:47)
80
http://youtu.be/kx45UGkbbbo
(2:28)