Coding4Fun Drone posts
- Introduction to DJI Tello
- Analyzing Python samples code from the official SDK
- Drone Hello World ! Takeoff and land
- Tips to connect to Drone WiFi in Windows 10
- Reading data from the Drone, Get battery level
- Sample for real time data read, Get Accelerometer data
- How the drone camera video feed works, using FFMPEG to display the feed
- Open the drone camera video feed using OpenCV
- Performance and OpenCV, measuring FPS
- Detect faces using the drone camera
- Detect a banana and land!
- Flip when a face is detected!
Today code objective is very simple:
The drone is flying very happy, but if the camera detects a banana, the drone must land !
Let’s take a look at the program working:
And a couple of notes regarding the app
- Still use Haar Cascades for object detection. I found an article with a Xml file to detect bananas, so I’m working with this one (see references).
- Using Haar Cascades is not the best technique for object detection. During the testing process, I found a lot of false positives. Mostly with small portions of the frame who were detected as bananas. One solution, was to limit the size of the detected objects using OpenCV (I’ll write more about this in the future)
- As you can see in the animation, when the drone is a few meters away, the video feed becomes messy. And because the object detection is performed locally, it takes some time to detect the banana.
- I also implemented some code to take off the drone when the user press the key ‘T’, and land the drone when the user press the key ‘L’
- The code is starting to become a mess, so a refactoring is needed
Here is the code
In next posts, I’ll analyze more in details how this works, and a couple of improvements that I can implement.