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Experiments with parfocal motorized zoom lens

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on 2021-07-01 0 Comments
Experiments with parfocal motorized zoom lens

Motorized zoom camera C1_PRO_X18 has two independent stepper motors for Zoom and Focus control. More specifications can be found in the documentation area. By design, this varifocal lens means the focus will be lost after the magnification motor is moved. However, the lens has linear rail reference points and it is possible to calibrate the lens so it will behave like […]

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Making fine pitch PCB prototypes with fiber laser

  • How To
on 2021-01-07 32 Comments
Making fine pitch PCB prototypes with fiber laser

There are quite a lot of inexpensive and fairly reliable PCB manufacturers that can produce double-sided PCB’s with solder-mask and silkscreen in a day or two, but what if you need it now? I will not cover expensive prototyping machinery nor messy printer/etching process instead let’s use a 20W Fiber laser. Because… who does not […]

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Pulling full resolution from a webcam with OpenCV (Windows)

  • How To
on 2020-07-12 12 Comments
Pulling full resolution from a webcam with OpenCV (Windows)

OpenCV while being the most popular tool for a lot of machine vision applications it relies on a third party and some poorly maintained code. Capturing MJPEG compressed video from a UVC USB camera was always the case and it did not work or worked with some issues. This situation is especially bad for Windows OS. […]

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Measure linear rail quality with camera and excel

  • How To
on 2020-06-29 2 Comments
Measure linear rail quality with camera and excel

No matter how precise and rigid your mechanical system is, it will always have some imperfections. These imperfections can be measured and described. If measurements show opposite it means your measurement tools are not precise enough or you are doing it wrong. There are a lot of expensive and highly specialized tools to measure every […]

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UVC camera exposure timing in OpenCV

  • How To
on 2020-05-22 2 Comments
UVC camera exposure timing in OpenCV

USB cameras can have the exposure set to manual (cheaper ones have only full auto mode). It’s a pretty straight forward function in OpenCV, but insufficiently documented thus hard to find exact times and calculations. Also there are two major implementations for Linux and Windows. Linux – exposure times are set in units 1/s (all […]

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C920 rework kit updates

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on 2019-12-22 12 Comments
C920 rework kit updates

Recently updated C920 webcam version was released featuring new PCB. These changes introduced two unexpected issues: wiring is different and new PCB has mechanical interference with aluminium rework kit back plate. Test-point locations If you rework webcam by yourself, please use pin-out diagram as pictured below to solder wires. TP24 – VCC TP26 – USB […]

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How to capture 30fps with Kurokesu cameras in David-3D

  • How To
on 2019-04-22 4 Comments
How to capture 30fps with Kurokesu cameras in David-3D

When talk comes about 3D scanning everybody knows David-3D software. It’s a pity but it lacks trivial camera control options like selecting MJPEG mode and stuck in YUYV uncompressed mode, this limits performance to low frame rate (about 5 fps). David-3D software does not like it and refuses to scan. It was an issue and […]

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Which USB to COM port is the most recent one?

  • How To
on 2019-02-01 0 Comments
Which USB to COM port is the most recent one?

How many times did you find yourself looking for Windows Control Panel and wondering which is the most recent plugged USB to SERIAL com port? Well simple and clean Python script comes very handy for this task. Just start a script and plug in new device – new com port will be displayed with minimal […]

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Pedestrian detection using YOLOv3

  • How To
on 2018-12-10 8 Comments
Pedestrian detection using YOLOv3

Owning a quality camera can be fairly useful by itself. Video stream can provide a lot of information not easily comprehendable by just using various sensors. However, not always there is a human eye to make a sense of it. Therefore, additional algorithms can be implemented to provide a lot of insights automatically. A lot […]

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Accurately measure height with microscope

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  • Projects
on 2018-07-09 10 Comments
Accurately measure height with microscope

As the subject implies this post describes a way to measure the height of an object using the motorized microscope. The whole trick is to take many incremental pictures of an object (and background as a reference) from different heights and analyze how sharp each frame is. Some interesting hardware is needed, but nothing that […]

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