30.6.2022: A new promo video can be found here

4.6.2022: From now we can save images/videos to DICOM format and store it to PACS system (Orthanc for example).

24.5.2022: We exhibited at ENT congress Wroclaw, it was not planned but the impression is great, thanks to all!

4.4.2022: Meet us at ENT conferences: 8-10.6 in Brno, 21–23.9 in Graz, 27–29.10 in Mannheim.

21.12.2021: We annonounce with a pleasure, that we start distribution of superb fiberoscopes from japanese company Machida which works perfectly with our cameras.

18.12.2021: GDT 3.0 support added to our software


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Contact Info:

  • Kettex Development s.r.o.
  • Pod vodárenskou věží 4, Prague
  • Czech Republic
  • E-mail:
  • Cell phone: +420 728 526 720


I've had quite a few questions about TrueHDR. I have decided to accept this challenge, and to try to make this technology clear. It's a challenge for the teacher and image processing specialist in me.

TrueHDR – the technology has been known for decades, and any mobile phone can now do it. Even on your mobile phone, there is an option in the photo app to choose HDR capturing. What good is that? Imagine using your cell phone to take pictures inside a room that has a window. If you're taking a picture of part of the inside of the room and you've got part of the window in the frame at the same time, it's almost certain that you won't like the result without HDR. Either everything that can be seen from the window will be too light and at the same time the inside of the room will be properly exposed or it will be that what can be seen from the window will be properly exposed and the inside of the room will be too dark. TrueHDR can prevent this.

Okay, what's the point in endoscopy? If there are places in the field of view that are close and others that are far away, it's very similar to the case described. Those places close by may be overlit, and those far away may be too dark. The second option is if there are objects in the field of vision with a large difference in colour and reflectance of light. An example? Rhinoscopy, cystoscopy, hysteroscopy, colonoscopy, gastroscopy, or any surgical procedure in a tubular area, or when there is, for example, a lot of tissue in the operating field, and fatty tissue, for example.

To avoid confusion, HDR isn't some simple image processing, or something like contrast enhancement or gamma camera correction enhancement. So what is TrueHDR and how does it work?

TrueHDR - works by saying that instead of shooting 30 frames per second, the camera shoots several times more, such as 90 frames per second. However, each of the first with the correct exposure - say, 8 ms, for example, and each of the second with the exposure of 4 ms, and one of the third with the exposure of 2 ms. This means that the burnt areas of the 8ms exposure frame are no longer overcooked in the 4 (or 2) ms exposure frame, because it hits the chip in ½ or ¼ times only ½ or ¼ light respectively. And now what HDR technology does is it has to put these three different images together very quickly in a way that makes it look good and takes the burnt spots out of the underexposed images and the little lit spots out of the original picture. That's all there is to it - the only problem is to do it well and quickly, even on a weaker computer in FullHD resolution. And exactly connecting our USB camera and computer makes it possible. That way, we can offer all the benefits of TrueHDR to doctors. I'm not aware of any endoscopic cameras on the market that TrueHDR also offers. If you feel like a larger demonstration is in the accompanying video.

If you've read this far, please feedback if my explanation is understandable.