Limits of Search and Rescue

Limits of Search and Rescue

Last year I lost a remote control plane that had a 1080p video camera onboard. The loss was largely due to not following flight procedures. It was the result of a combination of factors that could have been avoided. Once I realized that the plane was no longer responding to controls, it was too late. All I could do was watch as it slipped behind objects on the horizon. Searching for the plane was out of the question due to…

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Panoramas For The Public

Panoramas For The Public

There are tools like Hugin and PTGui that can take photos and stitch them to create panoramic scenes. Viewing them can be done in linux using EOG (Eye of GNOME) and the Panorama Viewer plugin by Andreas Eisenbarth. The images displayed in this post use a WP plugin as well. However, GSV (Google Street View) is likely the most simplest way to create scenes. Tools like Hugin and PTGui take time becuase they require inputting images, aligning, defining points, stitching,…

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Data-sheets, the devil in the details

Data-sheets, the devil in the details

Finding a suitable and reliable power supply for a project seems trivial to most. The battery selection is typically one of the common types available at stores. However, if you have a project that needs to run on battery, that choice will influence its overall use. The first question to ask is, what are the components of the project. These can range from discrete components to boards or modules requiring varying supply voltages. As the number of components increase, so…

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Battery Health

Battery Health

This post will be covering how to determine battery health using a number of methods. It will progress through each of these methods, highlighting some benefits and drawbacks. One of the easiest ways to test a battery is whether it will power a device or not. Using a voltmeter will provide how much potential is left in a battery. Although these methods are simple, they fail to provide how much life is left in the battery. This can be problem…

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Color Isolation with FFMpeg

Color Isolation with FFMpeg

I had written a post awhile back about color isolation using imagemagick. Here is a recap, but this time using FFMpeg. This turned out to be a good color pattern to do testing against. the reason I prefer this is because it contains white and black space to visually understand the results of the filter. Lets try this command. ffplay -i “color-pattern.jpg” -vf “colorhold=0xFF0000:similarity=0.25” Now our image shows only the defined color threshold, in this example it’s red. Here are…

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Software Gimbal

Software Gimbal

In this post I’ll demonstrate how to stabilize and enhance low resolution video using FFMpeg. I will also discuss the pros and cons of hardware options available. From there the discussion will show examples of software options that have supplanted hardware. Lastly, I will introduce some examples of AI that others have used. The Z51 660mm Below is a side by side comparison of video taken from one of my fixed wing remote control (RC) planes. Here is the script…

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Camera Angular Calibration

Camera Angular Calibration

These are a couple of resources that I’ve used for RC camera information that you may find useful, https://www.chucklohr.com/808/c16/ and https://oscarliang.com/how-to-use-808-16-keychain-camera-manual-and-wiki/. Those links are specific to the 808-16 key chain camera which I have used for bike rides as well as drone flights. There is mention about field of view measurements in the first link. It references methods used which I was not able to reliably validate. http://www.rcgroups.com/forums/showpost.php?p=22171449&postcount=6843 and https://www.rcgroups.com/forums/showpost.php?p=22446815&postcount=7732 both use the Pythagorean theorem. The camera and background are…

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Cleaning Up Underwater Video

Cleaning Up Underwater Video

Last summer was a chance for me and my family to do some water activities in the area. Snorkeling was a big favorite for my son. One of the locations had a fresh stock of fish that drew our attention. Unfortunately, the water in the lake grew cloudy due to our movement and it was a challenge to see. On a follow up visit, we brought one of my 808-16 video cameras. It’s a 720p camera and I wasn’t too…

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Elf on the shelf

Elf on the shelf

Ok, I’m going to trying to do a dictation of my new blog entry using this software called VOSK. V O S K. Anyway, it’s been eighteen months since I’ve done an entry and a lot has been going on. I’ve done a few things with IoT devices. I’ve been replacing the factory shipped firmware on these IoT devices with Espurna and Tasmota. This has involved opening up factory sealed devices and making physical changes to allow reprogramming. I have…

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SDR Antenna

SDR Antenna

The SDR hardware sold online usually includes an antenna. These antenna are not suitable to pickup radio transmissions that are low powered or distant. Here is an example of NOAA weather radio that is transmitted about 15 miles from my location. This first image is with the standard antenna shipped with the SDR adapter. The signal noise ratio is narrow, meaning the noise floor is high and the signal ceiling is low. The audio is noisy and hard to hear….

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