6 ms·

Why would it bother OCR'ing road signs? That seems much more error prone and needlessly complex. That data is readily available from a data sources based on you

by thematt 12y ago

Why would it bother OCR'ing road signs? That seems much more error prone and needlessly complex. That data is readily available from a data sources based on your GPS location, I know TomToms and other navigation devices have it.

nawitus 12y ago
At least in Finland, probably in Sweden too speed limits change often (every 6 months) due to winter. In my experience the GPS databases are extremely often not in sync, and you can't predict which speed limits change and when. In addition, there are electronic speed limits that change depending on the weather in real-time. OCR seems like a better option for these conditions.
- noselasd 12y ago
  And they can change faster than that. Yesterday they put up a 50km/h sign for half a kilometer at my drive to work due to some roadwork, today it was gone again.
- deleted 12y ago
  [deleted]
interurban 12y ago
I think OCR may have reliability issues, but most road signage has consistent properties (size, height, font, etc.) that could be easily optimized for. It also covers the (admittedly limited) situations where no GPS is available (tunnels, skyscrapers). If there are temporary changes in speed limits due to construction or other events, OCR could immediately identify those with no need to download new information.
steven777400 12y ago
I know in Seattle there are variable speed limit zones, where the signs are digital displays that can be changed at anytime to reflect appropriate speed limits for the current conditions.
- DasIch 12y ago
  These are heavily used in Germany on the Autobahn as well.
  - warbastard 12y ago
    And in the UK on the busier stretches of motorway
tzakrajs 12y ago
Those databases are quite often out of date and incomplete.
perbu 12y ago
Speed limits might change without prier notice due to a car accident or road works ahead. Such works might be initiated by authorities responding to an accident or similar without planning or access to update a central database.
joosters 12y ago
Well it's what us humans do and it works OK for us. No internet connection or satellites required either.
deleted 12y ago
[deleted]
mkempe 12y ago
Maybe because their goal is to steadily build a car system that can read the environment and adapt speed and direction based on the actual situation? a map is not the territory. The latest models also detect pedestrians, bikes, and even animals -- and the car sets off an alarm and brakes so that we don't run over them. High beams are politely turned off when meeting another car, as well as when passing near pedestrians. The software also performs lane detection, shows you where you're heading when moving in reverse, signals to the driver when another vehicle is close by to the left or right, even if you can't seen them in the rearview mirrors. Volvo has a goal of preventing or mitigating accidents to such an extent that by 2020 nobody will die in a Volvo when there is a car accident. Their commitment to the safety of car passengers was such that they let everyone freely use their patented seat-belt system when they improved it. They've been running a team in Sweden for decades that travels to every single car accident involving a Volvo, so that they can understand the causes and consequences of the accident, sometimes even repeat the event in lab conditions -- and they can improve the cars accordingly. Yes, we own a (new) Volvo -- we picked it up at the factory in Sweden, drove around Europe for a few weeks, and returned it for them to ship it over to our US address.
- brownbat 12y ago
  I wonder what happens to speed limits when self driving cars are ubiquitous... I mean, once there are no more revenue from violations, and cars know ideal speeds far better than legislatures, should we just let the computers figure out what speed they want to go?
  - toong 12y ago
    Currently, 'recuding accidents' are the primary driver for speed regulations (at least in Europe) There are a lot of other variables to optimize for, both on individual basis (fuel, travel time, battery life, ...) and collective basis (congestion locallity, total time lost in congestion, emissions, ...) I guess legislatures - over time - will try to optimize some variables for 'the greater good' instead of minimizing your travel time :-)
    - 12y ago
sjtrny 12y ago
It would use both it's own location based database and OCR for any local changes such as road works and variable speed limits.
chipsy 12y ago
The car has to account for human beings holding up signs, e.g. accident sites, temporary construction, or school crossing guards. This functionality is demonstrated in one of the more recent ridealongs of Google's car.
fizz_and_buzz 12y ago
Where I live, signs that change to adept to the traffic flow a pretty common[1]. Also, sign for construction sites are not in gps databases. [1] http://commons.wikimedia.org/wiki/File:VBA_showing_100_kilometers_per_hour_limit.jpg http://commons.wikimedia.org/wiki/File:VBA_showing_100_kilom...
deleted 12y ago
[deleted]

by thematt 12y ago

nawitus 12y ago

At least in Finland, probably in Sweden too speed limits change often (every 6 months) due to winter. In my experience the GPS databases are extremely often not in sync, and you can't predict which speed limits change and when. In addition, there are electronic speed limits that change depending on the weather in real-time. OCR seems like a better option for these conditions.

noselasd 12y ago
And they can change faster than that. Yesterday they put up a 50km/h sign for half a kilometer at my drive to work due to some roadwork, today it was gone again.
deleted 12y ago
[deleted]

interurban 12y ago

I think OCR may have reliability issues, but most road signage has consistent properties (size, height, font, etc.) that could be easily optimized for. It also covers the (admittedly limited) situations where no GPS is available (tunnels, skyscrapers). If there are temporary changes in speed limits due to construction or other events, OCR could immediately identify those with no need to download new information.

steven777400 12y ago

I know in Seattle there are variable speed limit zones, where the signs are digital displays that can be changed at anytime to reflect appropriate speed limits for the current conditions.

DasIch 12y ago
These are heavily used in Germany on the Autobahn as well.
- warbastard 12y ago
  And in the UK on the busier stretches of motorway

tzakrajs 12y ago

Those databases are quite often out of date and incomplete.

perbu 12y ago

Speed limits might change without prier notice due to a car accident or road works ahead. Such works might be initiated by authorities responding to an accident or similar without planning or access to update a central database.

joosters 12y ago

Well it's what us humans do and it works OK for us. No internet connection or satellites required either.

deleted 12y ago

[deleted]

mkempe 12y ago

Maybe because their goal is to steadily build a car system that can read the environment and adapt speed and direction based on the actual situation? a map is not the territory. The latest models also detect pedestrians, bikes, and even animals -- and the car sets off an alarm and brakes so that we don't run over them. High beams are politely turned off when meeting another car, as well as when passing near pedestrians. The software also performs lane detection, shows you where you're heading when moving in reverse, signals to the driver when another vehicle is close by to the left or right, even if you can't seen them in the rearview mirrors. Volvo has a goal of preventing or mitigating accidents to such an extent that by 2020 nobody will die in a Volvo when there is a car accident. Their commitment to the safety of car passengers was such that they let everyone freely use their patented seat-belt system when they improved it. They've been running a team in Sweden for decades that travels to every single car accident involving a Volvo, so that they can understand the causes and consequences of the accident, sometimes even repeat the event in lab conditions -- and they can improve the cars accordingly. Yes, we own a (new) Volvo -- we picked it up at the factory in Sweden, drove around Europe for a few weeks, and returned it for them to ship it over to our US address.

brownbat 12y ago
I wonder what happens to speed limits when self driving cars are ubiquitous... I mean, once there are no more revenue from violations, and cars know ideal speeds far better than legislatures, should we just let the computers figure out what speed they want to go?
- toong 12y ago
  Currently, 'recuding accidents' are the primary driver for speed regulations (at least in Europe) There are a lot of other variables to optimize for, both on individual basis (fuel, travel time, battery life, ...) and collective basis (congestion locallity, total time lost in congestion, emissions, ...) I guess legislatures - over time - will try to optimize some variables for 'the greater good' instead of minimizing your travel time :-)
  - 12y ago

sjtrny 12y ago

It would use both it's own location based database and OCR for any local changes such as road works and variable speed limits.

chipsy 12y ago

The car has to account for human beings holding up signs, e.g. accident sites, temporary construction, or school crossing guards. This functionality is demonstrated in one of the more recent ridealongs of Google's car.

fizz_and_buzz 12y ago

Where I live, signs that change to adept to the traffic flow a pretty common[1]. Also, sign for construction sites are not in gps databases. [1] http://commons.wikimedia.org/wiki/File:VBA_showing_100_kilometers_per_hour_limit.jpg http://commons.wikimedia.org/wiki/File:VBA_showing_100_kilom...

deleted 12y ago

[deleted]