Topics

1

General / From cylinder to plane

« on: February 18, 2019, 08:25:47 PM »

Hi there !

I scanned a cylindrical object, i'm looking for a solution to generate a planar orthophoto from the perimeter of the object, to unfold it in a way ..
Is that possible ?

Thanks a lot !

2

General / Feedback & tips for metalic surfaces

« on: January 04, 2019, 10:28:49 AM »

Hello there,

I'm on a tricky project and I'm looking for tips !

I've to scan a set of aluminium / pewter tubes ( around 60-70 tubes ) for a metrological project from an orthophoto.
It have to be quite precise, mainly for their positions from each other.

What I can do and what I have  :

- Spots
- Polarised filter (useless ATM )
- Flash
- Controled natural light/shadow
- Photoshop for raw

What I can't do and what I miss :

- Direct operation onto the surface ( spray, ... )
- moving the tubes on a turntable

These tubes are in a wood structure so there are some nice non-metallic marks

The result must be an orthophoto from the mesh

I've done a first attempt, 60% them are really bad, 20 % just bad and 20% quite good. Don't understand why some are goods.

Is there anyone with a good idea to improve my process ?
I thought that I could use something like projected light pattern onto the tubes ...
Replacing white burned part of the tubes to another color in photoshop ...

An idea ?
Have a good day 

3

General / undesired objects on orthophoto

« on: February 01, 2018, 03:50:14 PM »

Hello people

I'm trying to generate an orthophoto of a wall with a scaffolding front of it.
I'm trying to make it disappear to just have the wall.
I've pictures of the wall behind the scaffolding.
My problem is : even if i make it disapear, some pieces of it stay like a ghost ( low opacity but viewable ) on the orthophoto.
The dense point cloud was made in high quality and dept, the model too. I don't see the scaf'  on the pointclound and on the low quality texture model.

is there any tricks ?

I've something like 700 pictures, it'll takes me a century to hide, manually the object.

I tried to do the orthophoto of the back of the wall but, even if the result is better, there are always some problems.

Thank a lot

4

General / Mixing short and long focal

« on: January 26, 2018, 01:25:50 AM »

Hello people,

I'm actually trying something with a building ( 15m height ) i haven't got any material to go so high, so i took my 100-300m sigma to go 20m far from the building and take pictures, of course, it didn't work, i have searched on the forum, but didn't found something interesting...

Is that impossible to mix short ( 24mm ) and long ( 150mm ) focal ? no tips ? no manual process ?

Actually, my point cloud look like the building collapsed ...

thanks !

5

General / Choose opacity of point cloud

« on: July 09, 2017, 04:28:28 PM »

Hello,

Is that possible to change the opacity of a dense pointcloud ?

I have an in and out object, i want to view the interior points behind the exterior to draw a plan. both are very denses so i can't see throught
I know that some soft like pointcab or others can do it .

Thanks a lot

6

General / Shooting high objects

« on: November 05, 2016, 02:26:16 PM »

I wondering how do you do to shoot high object/construction, from 8 to 30m high with a good accuracy ?

Without UAV of course,

Mast, ladder, zoom lens, ... ?

7

General / Perfect XYZ align without GPS

« on: September 20, 2016, 04:32:48 PM »

Hello everyone,

I work in a company who use Agisoft photoscan pro,
I'm in charge to do a work, and I have a problem,
I searched in the forum but didn't find a solution.

I use a DSLR without GPS and i have to do an orthomosaic to draw a blueprint with draftsight.
to do this blueprint my model have to be perfectly aligned on the 3 axis before create the photo.

Easy with a GPS but without ...
I wondering if there is any solution to align like that ?


Or maybe a tips, to prepare my scan in " real world ", that could help me to align ...

Thanks everyone,
Good day