Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

5 posts

Wannabe Geek

# 154463 28-Oct-2014 22:38
Send private message

Hi all,

For a stereo vision project I am looking to by a high quality mirror about 4" size.

Could anyone please point me to the right direction.

So far I've been able to find only this one , but neither shape, nor thickness are suitable.
The shape is better to be pyramidal (or rectangular) and the thickness - as thin as possible as the weight matter.


Create new topic
3344 posts

Uber Geek


  # 1164063 29-Oct-2014 03:44
Send private message

You wanting a mirror?  Or a prism?

5 posts

Wannabe Geek

  # 1164085 29-Oct-2014 07:12
Send private message

I think a mirror would be better for several reasons. Firstly, the weight of a prism of needed size. Secondly, one prism won't suffice as it would split the the ray by frequences. And third, a good quality prism of that size would be more expensive than a mirror, I suspect.

Please correct me if I'm wrong.


8894 posts

Uber Geek

  # 1164113 29-Oct-2014 08:42
Send private message

Google "front surface mirror" or "first surface mirror" (mirrors "silvered" on the top surface).
Prisms are a normal way to do this - that's how prismatic binoculars work.

5 posts

Wannabe Geek

  # 1164555 29-Oct-2014 18:40
Send private message

Thank you all for replies.

Porro prisms in binoculars have light entering and leaving normally and reflected inside. That is why it is not dispersive. However, in order make a stereo system to work with prisms (and not have huge prisms) there will be lenses required and more than one prism. So it keeps growing in size and weight. Little weight is essential in the case of my project that is why I want to go with just one mirror. Although a good part of the observable world is lost in this case it is still enough to get a depth map.

Where to buy a first surface mirror in New Zealand? I haven't found any suppliers.


3940 posts

Uber Geek


  # 1164753 30-Oct-2014 02:36
Send private message

Stereo vision? = 3D? Would be very interested to know what your project is, if it's not a secret.

Sometimes I just sit and think. Other times I just sit.

5 posts

Wannabe Geek

  # 1164756 30-Oct-2014 02:57
Send private message

It's not a secret but I would be very interested to know where to get a first surface mirror in New Zealand :)

The project is a UAV for interiour use. There are number of challenges to this including orientation in a building. For that after a lot of digging I decided to go with stereo vision to get a depth map with much more possibilities in the future. Other types of sensors are not good as I plan to make multiple such vehicles to work together and they will simply mess with each other's sensors. Those sensors include active depth map sensors (e.g. kinect) and sonar sensors (don't even provide enough information).

8894 posts

Uber Geek

  # 1165021 30-Oct-2014 14:09
Send private message

I can't help but think that unless there's a good reason not to do so (like cost / required quality of the camera/imaging device) then using two separate inexpensive cams may be much less trouble to set up and keep aligned than setting up frames etc to hold mirrors in place.


5 posts

Wannabe Geek

  # 1165084 30-Oct-2014 15:18
Send private message

There is a good reason for not using two inexpensive cameras - synchronisation. If the cameras are not synchronised in hardware then one camera will see slightly different scene that the other camera making it impossible aquire a correct depth map. Synchronised solutions cost too much.
Synchronisation must be on frame capture and not just clock (crystal oscillator) synchronisation.

Thanks anyway, now I know what type of a mirror I need. I did try using regular mirror - it's a disaster - a bit blury and slightly different spectrum.

Create new topic

Twitter and LinkedIn »

Follow us to receive Twitter updates when new discussions are posted in our forums:

Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:

Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:

News »

Samsung Galaxy Fold now available in New Zealand
Posted 6-Dec-2019 00:01

NZ company oDocs awarded US$ 100,000 Dubai World Expo grant
Posted 5-Dec-2019 16:00

New Zealand Rugby Selects AWS-Powered Analytics for Deeper Game Insights
Posted 5-Dec-2019 11:33

IMAGR and Farro bring checkout-less supermarket shopping to New Zealand
Posted 5-Dec-2019 09:07

Wellington Airport becomes first 5G connected airport in the country
Posted 3-Dec-2019 08:42

MetService secures Al Jazeera as a new weather client
Posted 28-Nov-2019 09:40

NZ a top 10 connected nation with stage one of ultra-fast broadband roll-out completed
Posted 24-Nov-2019 14:15

Microsoft Translator understands te reo Māori
Posted 22-Nov-2019 08:46

Chorus to launch Hyperfibre service
Posted 18-Nov-2019 15:00

Microsoft launches first Experience Center worldwide for Asia Pacific in Singapore
Posted 13-Nov-2019 13:08

Disney+ comes to LG Smart TVs
Posted 13-Nov-2019 12:55

Spark launches new wireless broadband "Unplan Metro"
Posted 11-Nov-2019 08:19

Malwarebytes overhauls flagship product with new UI, faster engine and lighter footprint
Posted 6-Nov-2019 11:48

CarbonClick launches into Digital Marketplaces
Posted 6-Nov-2019 11:42

Kordia offers Microsoft Azure Peering Service
Posted 6-Nov-2019 11:41

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.