Camera Calibration

[Duane Frymire]

I'm trying to calibrate the camera in the LS. Must have done something wrong because still says not calibrated. Has anyone done this or know where to find better instructions than in the help menu?

Thanks,
Duane

 

[Matt Johnson]

I have done it before Duane. Is there something in the built in help that you don't understand. Those are the only instructions at the moment.

 

[Duane Frymire]

Hi Matt,
a) on my laptop screen the calibration shows 14 dots vertically when fit to screen, but only 12 when I click full size. I do have a 12" or better screen. Which screen should I use, 12 dots or 14?
b) it says screen and LS need to be fixed for the duration, but then says to move the LS and leave screen fixed. How can I keep the screen dots centered in the green rectangle if I have to shoot pictures from the sides and top? Is the rectangle moving to clue me to move to the side or top, or so I just move the LS so the dots fit the rectangle and take a picture of the dots again?
c) am I to take pictures of the dots on the screen, or take pictures of some type of target (house wall, box, vase, whatever). If it's the target and the screen how can you do that while the LS and screen stay fixed on a tripod and table?

The only thing I could make of the directions was to move the LS each time so all the dots on the screen fit in the green rectangle and take a picture of that. But that doesn't follow the part that says pictures needed from sides and top (of something; screen, box, wall, both?).

Please forgive if this sounds dumb; haven't done anything with camera's or photogrammetry for 25 years.

 

[Matt Johnson]

a) I would use the fit to screen option. I don't think it matters if some dots are lost. Either option should work I think.

b) The LS and the image of the dots on your laptop just need to be stationary while the photo is being taken. The green rectangle displayed in the preview window needs to be aligned and oriented so that its border approximately matches the border of the calibration image. The LS, the laptop or both can be moved to accomplish this.

c) You are taking pictures of the dots.

You should be taking a sequence of photos that look something like this:

1

2

3

4

5

6

7

8

 

[Duane Frymire]

Thanks Matt,
So I took the pictures and hit proceed to calibrate. Now it shows me a screen on the right showing the first picture with what look like zoom in or out options and a calibrate button below. On the left are a list of the picture files, and underneath it says not calibrated. What do I do with these screens?

Oops, never mind, I see there's another help screen to go with this screen.

 

[Matt Johnson]

Press the Calibrate button. There are more details about this screen in the built in help menu.

 

[Duane Frymire]

Success! RMS 0.42 px