Browsed by
Category: Bike Rides

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…

Read More Read More

Pan, Tilt, and Zoom with FFMpeg

Pan, Tilt, and Zoom with FFMpeg

There are times when the content in an image or video is lost in the surrounding details. Live security camera systems have a feature known as PTZ, short for Pan, Tilt, and Zoom. This allows the live cameras a hardware and software way to focus more on an object of interest. With FFMpeg, we can do something similar. In this post I’ll cover the basics of PTZ. Unlike live security cameras were you might notice a transition from the wide…

Read More Read More

IOS Sensor Tracking with SensorLog

IOS Sensor Tracking with SensorLog

Over the years I’ve used a variety of sensor tracking programs that ran on smart phones.  These programs will read the sensors built in the phone and log them.  I like this because it uses hardware that is already available.  There are many apps that I have used to do this.  The latest one I used is called SensorLog authored by Bernd Thomas.  As of this writing it is at version 1.9.2, dated June 2nd, 2017.  I’ll be covering some…

Read More Read More