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General / Re: Shadows Causing Deformations in DSM
« Last post by imageprocessing1 on October 18, 2018, 06:46:00 PM »
thanks much James! I  will give these a try.
General / Need to preserve color information on shiny object.
« Last post by TravisBarton on October 18, 2018, 05:04:32 PM »
Hey everyone,

I need to scan a shiny object and get the color data. The helmet attached is an example.

I know I can cover it in matting spray and scan the object successfully.

I have heard about a workflow where the object is scanned once for color, then again with the matting spray to get the accurate shape.

I am wondering if anyone knows how this is done or if it is even possible.


General / Not getting decent results
« Last post by on October 18, 2018, 02:50:30 PM »

so ive got a 50 image rotation of this object and im trying to get a 3d mesh out of it.
Is it possible to get a decent result from these images?
Im currently just loading in the photos, and trying to align photos, but this is the result i get.
the green ticks are not part of the images, just an overlay thing.

here is a link to the images if anyone with more experience wants to give it a shot.

General / Network cluster setup questions
« Last post by jrp on October 18, 2018, 02:00:04 PM »
I have 2 (moderately) powerful windows workstations and 2 headless Linux servers, I would like to set up a network cluster. There are some details not clear in the documentation though. Sorry for the long list of questions:

1)Can I run 2 workstations as both a processing nodes and a client nodes? To do this, do I need to run photoscan twice on each workstation (once from commandline with –node; and once from gui), or is there a way to configure photoscan to act as both node and client?

2)Computers on our site use windows domain logins, I notice many settings (including turning on GPU processing!) are stored as a per user setting, is there a simple way to configure things so that user training is minimal in how to add network processing on the workstations?

3)If running it as above, do I need 4 licences, or will the 2 licences I have be good enough?

4)I may consider buying more licences and running the 2 headless Linux boxes also as nodes (they are dual Xeon E5-2640 v3 with no graphics cards – so not ideal, but not slow either) – is running the server and a node on the same machine a problem?

5)Are there any reliability issues with running a mixed Linux windows environment? (other than the simple to fix --root file path stuff?)

6)We have a staff member with a laptop with photoscan on, can they easily connect up to the network and run as a client, then easily switch to standalone for field use?

7)Also, how much network traffic is there with the network processing? Would the system benefit from 10Gbit ethernet, or is gigabit good enough? How much does latency on the network file store affect performance? Do the nodes cache data locally? Would they benefit from SSDs?
General / Combining images from different elevation
« Last post by tillwadell on October 18, 2018, 12:48:01 PM »

If I use the same drone but fly att different elevation over the same area giving me images with different ground resolution. What resolution will I end up having on the finished Orthomosaic?

If I do the same thing but the different elevation flights are next to each other but I still want to render them together. For example, first part of the area has the ground resolution of 2cm and the second part of the area has a ground resolution of 5 cm. What end resolution will my orthomosaic end up having?

Hope someone can shed som light to this.
General / Re: Shadows Causing Deformations in DSM
« Last post by James on October 18, 2018, 12:27:10 PM »
something else you can try is using this masking technique, and just manually mask all shadows once only, and this may be enough for it to ignore them in all photos.
General / Re: Shadows Causing Deformations in DSM
« Last post by James on October 18, 2018, 12:23:26 PM »
I came up with a solution to something like this in this post which involved deleting sunken areas in the mesh caused by moving shadows, and then using the model as a source to generate masks, but your mesh looks so undulating that i don't think it will help you out so much here.

Also the 5GBP bet was a one time offer and i won't be repeating it this time round!
Здравствуйте, Алексей
В руководстве python API  что-то не могу найти функцию возврата рассчитанных значении и ошибки для положения камер (понял, что center + T.mulp и получается хорошо) и всех поворотов через питон (думаю должно возвращаться что-то одно, другое пересчитывается относительно начальной привязки). Полагл для каждой камеры должно быть что-то типа класса reference только с возвратом, но это не так. Не подскажите?

Правильно я полагаю, что в этом классе:
newChunk.cameras[c].reference.location_accuracy=PhotoScan.Vector( (1, 1, 0.5) ) - задание точности положения x,y,z для выравнивания
newChunk.cameras[c].reference.rotation_accuracy=PhotoScan.Vector( (10, 5, 5) ) - задание точности поворота курс,тангаж,крен для выравнивания

Зачем нужен отдельный newChunk.cameras[c].reference.accuracy=PhotoScan.Vector( (1, 1, 0.5) )?

И как соотноситься это с точностью для отдельного чанка
            newChunk.camera_location_accuracy=PhotoScan.Vector( (1, 1, 0.5) )
            newChunk.camera_rotation_accuracy=PhotoScan.Vector( (10, 5, 5) )

 Думал для метданных камеры, там все списки пустые, что там должно быть я не знаю.

И еще вопросы:

1.Что такое Мастер-камера?
2.как через python перекидывать камеры в другой чанк, на данный момент я просто считываю камеры и заново импортирую фотографии. На это времени больше у программы похоже уходит.

Заранее спасибо, с уважением
General / Re: DJI Phantom 4 RTK
« Last post by stihl on October 18, 2018, 10:47:33 AM »
Regardless whether this particular RTK setup is stable or not - like 'aerial_survey' mentioned it's still mandatory to perform the measurements of control points scattered throughout your project site. If you have nothing to check your data against to it's pretty much useless from a surveyor perspective. In other words, you'll still be spending time walking around your project site and measuring points with RTK-GPS.

Furthermore it's interesting to think whether you'll even want to use RTK for the drone positioning and not just stick to PPK which has numerous advantages.
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