would, sometime, like to hear test results/comment for a tailors dummy (static object) with:(i) half camera count in continuous light&no projection (texture)(ii) half camera count in continuous light & projection (geometry) insofar as time saving is concerned (or lack of - in post processing).
The test , in fact , was two shootings , one with projection on and one with projection off , to compare results.
Very informative mphx. Thanks.Was the camera count split between the two shootings (or full for both)?
PS: Things are a bit better with dng format (raw format) because we can mass manipulate photos in photoshop and remove noise BUT jpeg photo is like ~4mb and dng photo is like ~20mb.Transferring photos from cameras to pc take ages with dng..not very practical...so we are sticking to jpeg for the time being..since the job is done with them...
Quote from: chadfxIf I am using CDHK with a Canon compact camera (A3300 IS) and shoot in DNG raw, it does not automatically correct for the lens distortion...so it appears different from the JPGs coming out of the camera. ...On this part of the original question... I wouldn't do any distortion correction prior to using Photoscan as you can either provide calibrated values to Photoscan or have it calculate distortion parameters for you. If the image offset calculated by Photoscan is different to that used in the in-camera correction then you will effectively be using distorted images.
If I am using CDHK with a Canon compact camera (A3300 IS) and shoot in DNG raw, it does not automatically correct for the lens distortion...so it appears different from the JPGs coming out of the camera. ...
That makes sense, thanks. I know that outside perspective correction is a usually a strict no-no for Photoscan. It sounds like it will figure it all out on its own either way (camera corrected JPGs or uncorrected RAWs). I certainly haven't had poor results from the RAWs, but it would be worth a comparison at some point I suppose (if only time were more plentiful...sigh)
Photoscan will figure "something" out regardless but not neces4444444sarily "it"... eg. you can feed it fisheye images and process them as rectilinear and it will figure something out. The calculations for lens distortion are all done from the optical centre of the image. If you in-camera correction does this on the geometric centre of the image file and the optical centre of the image is in a different position to this then the final result will be technically distorted, resulting in a mathematical best fit of all of the criteria put together. As a result, camera positions and rotations will also have small errors, compensating for the incorrect distortion correction and you'll see more noise in the sparse point cloud.If you want a comparison, try creating unfiltered dense clouds.
I tried it with only one camera connected (i remind i am using canon A2500).I set it up to take 2 photos.It worked well , but there was a pause between of the two shots of around 5 secs.For the project we want shorter pause , let's say around 2 secs max. Is this hardware related ? or it can be configured in chdkptp ?
We did some manual shooting.. preshoot + shoot...1st shot , plain shoot...2nd shot...2nd shot was messy...so as i said its logic that preshoot is needed before every shot.But it consumes time...
I am trying to figure out what do you mean exactly with the (1) approach..You mean i will make a new command in multicam.lua ?A variation of testshots?Something like this?And put the preshoot thing out of the main loop of this command ?
Its a project we need it done in like 2 months (if we can't manage it no big deal , but it will help us alot in our work)..so take your time
1.shoot_half must be issued and held.2.use shoot_full_only so it will go back to shoot_half and not go to off position.
So what you are saying is , that shoot_hook_sync that i am using (or even the simple shoot) , issues shoot_full and not shoot_full_only that will do the trick.So it needs some change in the structure of these commands , am i getting it right ?
PS : By the way whats the difference of shoot_half and preshoot i am using ?
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