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Messages - Bernard Rousset

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1
Software Dev / Re: Chronos V0.3.1 Beta
« on: October 10, 2018, 11:51:09 AM »
Hi,
I agree with BiduleOhm. I got a similar problem both on USB key of large capacity and on a SD card of large capacity also. They were exFAT formatted which is the current format for windows. To be recognized you need to use either FAT32 format if you get a PC computer (you can find a freeware able to do this as current PC with windows 7 and higher only use exFAT for large capacity support) or format in ext2 or ext3 if you are a Linux user.

Hope this help
Bernard

2
Chronos User Discussion / Re: Cheap SD cards class 10
« on: October 01, 2018, 10:57:27 AM »
Hi,
There is also a U3 SD card where both bitrate in writing and reading mode are specified here:

https://www.joybuy.com/3297606.html?_cps=62103310.230084386&utm_source=AD111&utm_medium=affiliate&utm_campaign=202779


In reading 100MB/s and 90MB/s in writing

Bye
Bernard

3
Chronos User Discussion / Re: Cheap SD cards class 10
« on: October 01, 2018, 09:27:00 AM »
Hello Nikon1,

I have modified a little my post and added the specifications you can find on the site if you look at the photos. 100MB/s is already a very good performance, even for a class 10!
To my knowledge The current maximum is 300MB/s but there are very few cards that allow this

It is always difficult to be sure of the performances. Normally Class 10 will allow a minimum bite rate of 10 MB/s

The symbol U1 gives the same value while U3 goes to 30MB/s as a minimum.
Finally the other figures should be taken in consideration as xxxMB/s or xxxX.

Here the card is a U1 and it isn't written 100MB/s or 667X or 667x150= 100050kO/s. Hope it is true at least for reading, probably a little lower in writing.


Bye
Bernard

4
Software Dev / Re: Software Roadmap - 0.3.1, 0.4.x, etc.
« on: October 01, 2018, 09:22:20 AM »
Hello,

You are very efficient and it is very nice to see how the software is getting better and better. I have bought one black and white (in fact grey) camera for scientific purpose. I do not want to make pretty photos and at the end I use a threshold to obtain only two colors black and white to define particules I will track though the frames. One. Anyway at first I need raw data and one Of the issues is the number of frames inside one record and also the time to save it. I will be very pleased to check the raw cinepack option.
I also wonder if a recording and saving in 8 bits (corresponding to low light) could be an option in the future ?

Have a nice day (or night depending on which side of the sea you are...)
Bernard

5
Chronos User Discussion / Cheap SD cards class 10
« on: October 01, 2018, 08:59:23 AM »
Hello,

There are currently very cheap SD cards from China. I have already buy a card elsewhere so I will not use this web site, but maybe someone should be interested. I didn't know the real performances of that kind of cards but it is indicated class 10...

And it is specified 100MB/s or 667X  seems pretty good !!


https://www.joybuy.com/600240860.html?_cps=62103310.1251138147&utm_source=AD111&utm_medium=affiliate&utm_campaign=202779

Bye
Bernard

6
Chronos User Discussion / Re: Happy to join the Chronos forum
« on: August 16, 2018, 12:11:44 PM »
Hello,
Thank you Nikon1 to take the time to give me this detailed answer. It is crystal clear.
Have a nice day
Bernard

7
Chronos User Discussion / Re: Happy to join the Chronos forum
« on: August 15, 2018, 12:28:59 PM »
Hello again,
Thank you Nikon1 for your comments and advices. I really appreciate.
 I didn't knew "the fluid head" but I already knew the possibility to add rotating mirrors and it would be difficulty in my case. I have an experiment with I already played with high speed cameras coming from colleagues (one phantom and one photron) equipped with long distance microscope lenses (questar or K2-SC with proper lenses) in order to have a field of view of few millimeters. The resulting working distance is not very long with difficult access which provides from using such rotating mirrors devices.
I can imagine that it is possibly a dream to program that kind of automatic tracking, but I am not convinced by the argument that it would have been done by other sellers if it is possible.
Technically feasible and good for the business is not always compatible. For example different phantom cameras can have different prices due to their limitation in maximum framerate. But in fact some of these cameras (the cheaper ones) are limited only by software, i.e. they should have higher frame rate but probably this would not be good for the market...

8
Chronos User Discussion / Happy to join the Chronos forum
« on: August 14, 2018, 10:21:32 PM »
Hello everybody,
I should have a chronos camera beginning on September and I am very impressed by all the work performed by you guys every weeks. Congratulations for the whole Krontech team! Software is improved step by step so fast, while the price remains quite low. I hope you will be able to keep that rythm!
I am not a professional in video/optics neither in software but I will try to follow your work.
I have one naive question but as you know to have the answer you must ask the question...
It seems to me that with FPGA lot of calculations can be made on board and maybe also some other tools as the brain of the camera seems to be located there.
 It may append that you want to follow a moving object and you don't need the full resolution of the camera. So you can use an ROI to reduce it and eventually increase the frame rate. Unfortunately, while moving the object goes out of the field of view. Should it be possible to change in real time the ROI to follow the object. If you know approximately the object velocity and if you adjust the camera properly you might in principle program something as every 10 frames, ROI is shifted by one pixel in the direction of the track of the object. Do you think this will be feasible?
Have a nice day,
Bernard

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