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Messages - sanjay

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Software Dev / Re: Chronos V0.6.0 Full Release
« on: March 25, 2021, 03:30:56 PM »
The linked instructions say that special factory calibration files are no longer needed for both the 1.4 and the 2.1, while the first post here only mentions the 2.1 can anyone please clear this up? Can the 1.4 generate it's calibration entirely on its own or is this limited to the 2.1?
Also, as the update currently cant be done "in place" but requires an SD-Card update, is the existing "factory" calibration data still relevant ion some way (like providing better results?)

A few notes to help clear things up (thanks for the help, Bian!):

Chronos 1.4
  • Fully self-calibrating from software versions 0.3.2 onwards
  • The old factory cal files aren't required/relevant anymore

Chronos 2.1
  • Fully self-calibrating from software versions 0.6.0 onwards
  • Required special factory files up until version 0.6.0, aka. factory cal
  • The old factory cal files can be kept in case you aren't satisfied with how the image quality works for your preferred resolution/framerate/gain settings, in which case you can safely revert to 0.5.0

Both Cameras
  • All calibration data generated by the camera itself can be backed up or restored via the Util -> Storage screen
  • It's possible to import calibration data between unstable and stable releases, but we recommend calibrating again after each update, since it's a short and automatic process

Software Dev / Re: Chronos V0.6.0 Full Release
« on: February 16, 2021, 10:44:58 AM »
Thanks for the feedback so far, everyone. Below are a few replies to various items:

Thanks for this update!!

One question to calibrate the camera - is it necessary to use a lense cap in step 1 too?

It isn't necessary to cover the lens in Step 1, as the sensor is running in a bypass/test mode, so it doesn't do anything with the light coming in.

Been using it for a bit now, and i really miss the "Play" Button in the Playback Screen? Is there a specific reason, why it had been removed in this Version? The Play button was very nice Way to view/review footage or to just have a loop playing. Still works with the Forward / Backwards buttons, but is kind of annyoing to allways need to hold the Button down and so on. Would love to see this Play Button come back in future Revisions if possible.  The File Browser /List Files option is Great though, finaly a way to check the Footage Without needing to have a PC right there.

This wasn't removed, but your default preferences were reset, which is why it was hidden again. It can be re-enabled by going into Util->Main, then checking the One-touch Playback option box.

Horizontal Banding: In cases where this occurs, it may help to black-cal a few times, especially after changing the shutter position. Will take a look, and have seen those sample DNGs, thanks Nikon.

Issues with 800x600: I've noticed this recently too, seems like changing the offset away from center moves the position of the vertical stripe. Also looking into it.

Lowered Dynamic Range: This is likely a side-effect of the sensor driver configuration. Some tweaks were made to the analog gain voltages to handle the vertical banding. Overall, we've been trying to work within the limitations of the sensor, and the tradeoff between the banding mitigation and light sensitivity hasn't been trivial. I'll keep an eye out for more info on this thread, as it is helpful in determining which areas still need improvement.

Software Dev / Chronos V0.6.0 Full Release
« on: February 08, 2021, 06:16:40 PM »
Hey everyone,

We're happy to announce a new release of software for both the Chronos 1.4 and 2.1 cameras. This version should especially be helpful to Chronos 2.1 owners, as our engineering team has spent even more time improving image quality and attempting to reduce vertical banding.

Something that's a bit different for this update is that you'll need to create an sd card image. We're having some issues with the package server, so the Util->Storage->Apply Software Update via network will not work for this update, but I still wanted everyone to have it instead of waiting for me to fix it. I'll come back and post when this update is also available via network update.

See for the update file, checksum, and a PDF of the release notes. Also contained in the PDF are instructions on how to update, and how to calibrate your camera, so hopefully that works as a start-to-finish guide for everyone. Please let me know if anything is unclear.

New Features and Improvements
  • Chronos 2.1 models benefit from an improved sensor driver configuration. The analog gain values of the LUX2100 sensor have been modified to reduce noise at higher levels of analog gain (also referred to as ISO), such as 6dB, 12dB, and 18dB. This translates to less vertical banding than in prior software versions. Adequate lighting is still highly recommended.
  • Chronos 2.1 models no longer require special factory calibration files. All calibrations required to use the camera with the best possible image quality can be performed by a customer in the field within 5 minutes via the Util -> Factory -> Column Gain Calibration function.
  • Chronos 2.1 models benefit from newly generated Color Matrix presets, as found in White Bal -> Color Matrix. Previous software versions had color matrices that were optimal for the LUX1310 sensor in the Chronos 1.4, instead of the LUX2100 sensor found in the Chronos 2.1.
  • A list of saved files on external media can now be browsed via Util -> Storage -> List Files. The same functionality exists to make it easier for users to select the save destination in Play -> Settings -> Pick Folder. The file browser also allows for users to delete files on external storage devices. This functionality is mirrored in the web page.
  • Monochrome cameras can no longer open Color Matrix settings. This was mistakenly enabled in 0.5.0.
  • Frame counts are no longer cut-off on the right-hand side of the display when in the Play screen when frame counts are six-digits long.

Known Issues, Updating, Calibration
Please see the PDF contained in the link above.

Chronos 2.1 Image Quality Change Demo
I've made a short video showing a before (0.5.1) and after (0.6.0) at HD with various analog gain levels. The main thing to note is the banding along the left and right sides of the frames in each shot, especially at 12dB. Please excuse the few spots of dirt on my engineering camera.
Download the video here: (I recommend downloading instead of viewing online because of the compression/loss of detail from streaming)

0.6.0 User Manual
We've also updated our user manual to reflect this update, as well as some general semantics. See:

As always, please feel free to reach out to us at for more urgent support inquiries. Thanks!

Software Dev / Re: Software support for alternate trigger modes
« on: January 04, 2021, 10:31:01 AM »
Apologies for the late reply as Krontech was on holiday break and we've just got back to the office.

We have yet to implement audio and acceleration triggering, as much of our software engineering effort is currently dedicated to new projects and critical bug fixes for the 1.4/2.1. On-camera image detection and triggering is something I'm weary about due to the performance demands it might have on the camera's CPU, but we have had some folks who have created their own code to handle this based on their requirements. Since our codebase is open-source, users are also welcome to create their own software solutions, and we'll always be around to help answer questions along the way.

That being said, our sales and marketing team recently ordered a Miops Smart+ trigger: to see how we could get it to easily and reliably serve those extra triggering purposes, so please stay tuned for some information on how to use this with a Chronos.

Chronos User Discussion / Re: Introducing Chronos 2.1 HD!
« on: November 06, 2020, 03:48:14 PM »
There was a question in my head, can I configure the usb connector to connect the wifi adapter through it? and control the camera
Question to the developers or to someone who is engaged in programming.
Nikon you don't need to answer a question if you don't know or if you have a theory!

Hi Sergey, regarding this I would highly recommend using an ethernet to wifi bridge that does not require the camera to set it up. If you'd like to look into the usb control of a wifi adapter, you'd have to look for something that would be compatible the the Chronos' version of the Linux kernel, as displayed below:

root@chronos:~# uname -a
Linux chronos 3.2.0 #67 Mon Nov 25 14:27:52 PST 2019 armv7l GNU/Linux

After a recent monthly mailing, I read that an update for the camera interface will be released soon. wanted to get more information for users, because maybe we have some suggestions or wishes that you may (if it is possible) can make in the update

Regarding the newsletter, yes, we have a software update on the way in the coming weeks that will address some bugs, add improvements to the 2.1's image quality, and add a new external storage file browser feature, so that you can see what has been saved to storage (and delete it if necessary). Development is almost done and we're about to start our test/QA procedure for this release, but here's a preview of the file browser screen:

Suggestions on what can be improved in software is always welcome. I think the best place for that would be in the Software Dev board under whichever software release thread that your feedback applies to (probably 0.5.0 at this point).

Chronos User Discussion / Re: Review of Chronos 2.1
« on: November 06, 2020, 03:17:25 PM »
Hi Sergey,

Would you be able to send us a message at

That way we could start a support email thread and help narrow down the cause of your saving issues, thanks!

Software Dev / Re: Chronos V0.4.0 Beta - Debian and Networking
« on: October 05, 2020, 01:49:33 PM »
Hi, I just formatted the micro SD card that came with our 2.1 camera before making a backup of the calibration settings (because, apparently, I'm an idiot). Are these settings lost now? Are they stored on the micro SD card or on the camera itself? If the latter, can I retrieve them by flashing the firmware the camera came with (no idea which version number that is though) back onto the micro SD card, inserting it and exporting the calibration to a USB flash drive before flashing the newer version? Thanks in advance!

Hi davto, the settings are stored on the microSD card. You'd be able to reflash the sd card with 0.5.1, but the 2.1s have factory calibration files that would need to be reloaded. Please send an email to with your camera's serial number, and I'll send you the appropriate calibration files.

Chronos User Discussion / Re: Nikon Battery
« on: September 25, 2020, 02:45:58 PM »
Hi Chrissie,

If the outside dimensions are exactly the same as the battery that shipped with the camera, it might be the width of the gap between the contacts on the battery itself.. How do the contacts on the new battery compare to the included one?

Hi Kristian,

Are you able to get the startPlayback to work if you use a curl command? On my camera here in the office, the below command will successfully put the video pipeline into playback mode and
advance through frames as expected:

curl --header "Content-Type: application/json" --request POST --data '{"framerate":60, "position":0}'

I took some time to try out the axios client in some test scripts as well and had trouble with post requests whenever they needed extra parameters, so I think something is missing there.

Software Dev / Re: Screen Brightness Control
« on: September 11, 2020, 10:53:25 AM »
Thanks for the feedback! Brightness control for the LCD display is something in the works for a future update, so please stay tuned. As far as more intelligent features like an exposure indicator, we'd have to do a bit of digging before coming up with a solution, but it is definitely a useful idea beyond the zebra stripes.

At this point in time, and with the resources we have in the software engineering department, I'm trying to adhere to a quarterly update schedule for the Chronos 1.4/2.1.

It's tough to say at this point, since we'll need to investigate to see if it pertains more to software configuration of the sensor, or the sensor's limitations.. I'll post here if there's an update.

One thing that might help for now is to select the highest analog gain setting that does produce output, and then combine that with the digital gain setting that's also found in Record Settings.

Software Dev / Re: Chronos V0.5.0 Full Release
« on: August 19, 2020, 12:16:05 PM »
Must say, I love what you did with the interface. Very nice! :D

Thanks DDR! Hope all is well with you.

Saw the tweet about the minor update but nothing pertaining to what the update was about.
Ist an update mainly for the 2.1 of the New batch which have some issue at higher gain-Values.I allready updated, and while i never did a direct comparison, the new update improoved Image Quality a bit from What i can tell and removed a bunch of issues with no image at all beeing displayed at some Resolutions/ Framerates at Very high gain.I dont think the Update does anything to the 1.4 or the older batch of 2.1s but is mainly for the New 2.1s.

Yes, the 0.5.1 update was minor and only affects Chronos 2.1 cameras. We noticed some variance when our production team started building Chronos 2.1s with a new batch of image sensors, and so an analog voltage was updated via software to mitigate the issue while slightly improving the old batch of sensors already in the field. Thanks for providing some info in lieu of my late response, Nikon1.

The viewfinder going black is known behaviour when the image sensor is configured with specific resolution and analog gain combos. Thanks for bringing this up, as I don't think we currently document this anywhere, so I'll add it to the new software manual that is in the works right now..

Specific common resolutions where this will occur:
1024 x 768 at or above 18dB
1024 x 576 at or above 18dB
800 x N at or above 12dB
640 x N at or above 12dB

Thomas' suggestion may also apply if the issue persists while the gain is less than 12dB for the above resolutions.

Software Dev / Re: Chronos V0.5.0 Full Release
« on: July 23, 2020, 10:40:54 AM »
Thank you for the update! The development is coming along very nicely.
I am not sure if I was not able to find it, but is there a place where 'bugs' can be reported?
For example, saving the file using python/json confuses the camera, where it needs to be restarted. Frame number starts jumping around wildly.

post ='control/startFilesave', \
   json = {'format': 'h264',\
               'device': 'nfs',\
               'filename': 'test',\
               'start': 0,\

Hmm, thanks for pointing this out. I'll investigate further and see if I can replicate it. Bugs can be posted here:

Could you keep the link to the builds in the original posts when posting new updates? ;) It makes it easier to keep track of things for those of us who are still using Balena Etcher to update.

Ah yeah, good point. Will keep this in mind for future updates.

Regarding the manual, look out for one in the coming (3ish) weeks. We're taking the time to rewrite the entire thing to make it easier to understand, but for urgent needs, I'd say about 95% of the V0.4 manual is still valid for V0.5 operation.

Hello Sanjay, I wonder if there's any update on the manual for V0.5.
It is still being written, but please let me know via PM or through our official support email if you need help with anything specific in the mean time.

Software Dev / Re: Chronos V0.5.0 Full Release
« on: July 06, 2020, 05:01:10 PM »
Hi sanjay,

loving the update so far, zooming is very useful and an excellent addition.  Are there any plans to get the UI to be able to switch to top and down for 720p record mode (I am on the 1.4)  The screen real estate is eaten by the UI on the left or right but it would be extremely cool if we got to see the image preview in the full width of the screen which will be considerably larger.  The UI thread from DDR (which I am including the image) had this exact layout in testing. Just wondering if it's coming or scrapped?   
Great work on 0.5 team!

There are no plans to implement the horizontal top/bottom bars in the UI. We're sticking to the sidebar to keep things unified and predictable across updates.

Regarding the manual, look out for one in the coming (3ish) weeks. We're taking the time to rewrite the entire thing to make it easier to understand, but for urgent needs, I'd say about 95% of the V0.4 manual is still valid for V0.5 operation.

Hi Sanjay,

I'm using Chronos with Matlab over network connection and it works good so far. I was waiting for the official software update to get rid of some bugs that i mentioned before in anther posts. Parameter disableRingBuffer, which will stop the recording when the buffer is full, is still in V0.5.0 not responding even if I change the state to true.

Can you suggest me a switch or router that is not going to cause an issue with the camera while starting up?

Hmm, I'll give the disableRingBuffer parameter a try on my side and see what happens. Any gigabit switch or router should be fine.

If you're looking for an unmanaged switch, something like this would work:
If you're looking for a router, something like this would work:

Other folks could probably also chime in on what router/switch works for them.

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