Matlab needs to calculate distance and find pixel size
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
Stelios Fanourakis
am 28 Jan. 2019
Beantwortet: Mark Sherstan
am 29 Jan. 2019
Hi, I need to do image calibration between two known points on an image.
Let's say that we have those two points [130,799] and [602,799], where the first are rows and then the columns. I know I need to use the euclidean distance equation like this
So assuming
y1 = 130
y2 = 602
x1 = 799
x2 = 799
distanceInPixels = sqrt( (x2-x1).^2 + (y2 - y1).^2);
How do I combine all those stuff and finally get the calibration factor of mm/pixel.
Please help.
0 Kommentare
Akzeptierte Antwort
Mark Sherstan
am 29 Jan. 2019
You need to know the distance between those two points. I attachted part of a presentation where I did just that. I placed three "calibration blobs" at the start of the video. Masked the image for green, then red, then blue to find the "blobs". Using the euclidean distance equation you provided I took the known centroid-centroid distance divided by the pixels for each color mask and then averaged the results. Let me know if you have any further questions but you are almost there!
0 Kommentare
Weitere Antworten (0)
Siehe auch
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!