Speed Registration
Emelia Lute
Hello everybody.
I use Elastix module for deformable multimodal registration of 3DCT and 3DMRI scans of human head and neck. It works very well. Thank you for this amazing software tool!!!
Unfortunately, one registration takes about 45 minutes and I have approximately 150 data sets to be registered (a huge amount of time). Do you have any idea how to speed up the registration process??? CPU is used to 70% and memory only approx.4GB during the calculation.
Depending on the size of the datasets, 45 minutes is actually acceptable. You can downsample your volumes with CropVOlume, which will definitely help with the speed, but at the expense of detail. Alternatively, you can try to find a computer that has many cores (your laptop has only 6). That will speed up the process.
I would expect that a simple rigid+bspline registration can be completed in a couple of minutes, but you may need to tune the registration parameters to reduce computation time without impacting accuracy.
However, learning about how Elastix works and experiment with various parameter sets may take longer than just run the registration on all your data sets as is (which should complete within 5 days). Maybe the best is to start the batch registration as is on one computer and if you have nothing else to do then experiment with different parameters (how you initialize the registration, how many samples do you use, what is the stopping condition, maximum number of iterations, etc.).
A low-speed vehicle is a four-wheeled motor vehicle whose speed attainable in one mile is more than 20 miles per hour and not more than 25 miles per hour on a paved level surface. It may not be operated on any highway where the speed limit is more than 35 miles per hour.
Motor vehicle titling and registration fees are processed through your local county treasurer's office. License fees on low-speed vehicles are determined under the current Non-Commercial Vehicle Fee Schedule (PDF).
Any resident who owns a low-speed vehicle may apply for a low-speed license plate. A low-speed vehicle is a 4-wheeled motor vehicle whose speed attainable in one mile is more than 20 miles per hour and not more than 25 miles per hour on a paved level surface. A low-speed vehicle may not be operated on any highway where the speed limit is more than 35 miles per hour.To apply for license plates, owners of a low-speed vehicle must complete a Low-Speed Vehicle Affidavit. To qualify for registration and plates, the vehicle must be equipped with:
During the club ride, I noticed that my 3-seconds wattage data was also not as reliable as it should. It seemed to follow a similar pattern whereby the value would be too high and then too low, too high and normal again but it was more continuously throughout the ride. I don't know if this is related but it would be very coincidental. But afterwards, looking at my power data I don't see any real issues or similar pattern although I must say that it does show a higher up and down pattern for the more stable stretches when comparing to previous rides.
It is the result of the bad code in the firmware and the GPS LAT/LON values are duplicated ("duplicated GPS data" issue, I posted it many months, years ago, all Edge units are affected since many many years and only a speed sensor can "hide" it, the Garmin coders cant fix it "somewhy".) due to low priority for GPS chip. sometimes it is more frequent during a ride, sometimes not, but it is really annoying (especially if You dont use speed sensor on your bike and analyze your ride on Strava, on GC, it is "not problem" because that is unsuitable for 1sec chart analysis...)
But if You share your original FIT file (in zip here or in private message) , i can show You the problem from raw datas.
"to compare, from another ride where there were no issues, you see how the curve is much more smooth on a similar straight piece"
It has this problem also just You didnt recognize... (not so spectacular, ofc, but those are /the result of/ GPS values duplications...)
if You have problem with power values too, that could be any other issue (pmeter-related or other connection-related between pmeter and edge). what kind of powermeter do You have and which protocol is used (ANT+ or BT) for connection?
yeah, there is NO SOLUTION... (just the speed sensor which is hiding this problem but not solving it) With powermeter the recording rate is always 1sec so the "smart" is not working in your case (maybe You can set it manually for "smart" in settings but there will be 1sec recording if pmeter is connected and sensed). but the smart means less data, and less data gives you "less problems" , thats all, but that is not solution neither just harder to notice the issues :)
I've been checking it out on my past rides and suspect it could also have something to do with disturbance of the GPS signal. For example here the disturbance happened after I went through a short tunnel. It is more pronounced in this case. It is possible that in some cases there is something in the ground that reflects the signal? Or when you ride through a forest or between houses that could all influence the signal.
I have been comparing a couple of rides where I do exactly the same trajectory and at some points I get a fairly consistent reoccurrence. Power lines, underground gas pipes, crossing water, houses, steep hills.. they could all influence the accuracy. A few weeks ago, I did a club ride which partially went along a river with small lakes next to it and it shows a similar disturbance along those stretches.
no, it happens on totally clear roads also where no powerlines, no trees, so nothing. Of course, the tunnels and other obstacles can cause gps signal drop but that is not duplication (when there is signal drop, there the GPS values are blank data records, where there is duplication, there are 2 totally same LAT/LON value in 2 rows (so for 2 secs), which is impossible if you (or your bike) is moving, the only thing can cause it the bad coding and low priority for GPS dataflow and the main cpu (or dont know what is the exact design) doesnt get new GPS values within time (so within less than 1000millisec, i dont know what is the exact time limit here, maybe 800ms or similar) and using the last known LAT/LON values again (which cause duplication, and summary issue in "distance" datafield)
the problem is that the Strava is drawing the speed chart from the change of the "distance" data values sec by sec (and not using the "speed" data values) and this cause this erratic strava speed chart ...
Off highway motor vehicles (OHV) are vehicles that are not intended to be driven or moved on a public highway. However, if specifications are met, vehicles not intended for highway use may qualify for registration plates and may be operated on certain roads in Tennessee.
"Class I off-highway vehicle" means a motorized vehicle with not less than four non-highway tires, no more than six non-highway tires, whose top speed is greater than 35 mph, that is limited in total dry weight up to 2,500 lbs, that is 80 inches or less in width, and that has a non-straddle seating capable of holding no more than four passengers and a steering wheel. "Class I off-highway vehicle" includes mini-trucks.
"Class II off-highway vehicle" means any off-highway vehicle that is designed to be primarily used for recreational purposes, that has a non-straddle seating capable of holding at least two but no more than four passengers and a steering wheel, and that is commonly referred to as a sand buggy, dune buggy, rock crawler, or sand rail. "Class II off-highway vehicle" does not include a snowmobile or other vehicle designed to travel exclusively over snow or ice.
For details regarding which types of OHVs qualify for registration plates, please click here : Plates for Off-Highway Vehicles. Application for these plates should be made through the office of the local county clerk. For title and registration of an OHV, requisite proof of ownership documentation is required. For Low-Speed or Medium-Speed registrations, a Low-Speed Vehicle Affidavit or Medium-Speed Vehicle Affidavit is also required. The clerk may require an affidavit for registration of Class I/Class II OHVs.
For OHV owners not registering the vehicle for operation on roads, a title-only may be issued provided the applicant supplies the requisite proof of ownership documentation. If a title has been issued for an OHV, a Tennessee Department of Revenue (TDR) sticker must be affixed to the vehicle as evidence that a title has been issued. The sticker is non-renewable and non-transferable and becomes invalid when the vehicle is sold or dismantled. A TDR sticker must be affixed to any OHV/ATV operated in many federal or state owned facilities such as parks and game reserves. TDR stickers are issued by the County Clerks.
Table of Contents Title 46.2. Motor Vehicles Subtitle III. Operation Chapter 8. Regulation of Traffic Article 12.1. Low-Speed Vehicles 46.2-908.3. Low-speed vehicles; operation on highways; license required; registration required; safety and emissions inspections not required
Low-speed vehicles may be operated on public highways where the maximum speed limit is no greater than 35 miles per hour, but this limitation shall not prohibit the operation of low-speed vehicles across intersections with highways whose maximum speed limits are greater than 35 miles per hour. Operation of low-speed vehicles shall be prohibited on any highway where the Department of Transportation or the local governing body of the locality having control of the highway, as the case may be, has prohibited their operation in the interest of safety and such prohibition is indicated by conspicuously posted signs.
Low-speed vehicles shall be titled and registered as provided in Chapter 6 ( 46.2-600 et seq.) and shall be subject to the same requirements as to insurance applicable to other motor vehicles under that chapter.
The operator of any low-speed vehicle being operated on the highways in the Commonwealth shall have in his possession: (i) the registration card issued by the Department or the registration card issued by the state or country in which the low-speed vehicle is registered, and (ii) his driver's license, learner's permit, or temporary driver's permit.
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