AdvancedCNNs from scratch in NumPy: convolution as a matrix multiply
Convolution forward and backward with no framework. The im2col trick that makes it fast, why the backward pass is a convolution too, and a net that trains.
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Computer Vision
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Advanced
IntermediateControl your volume with hand gestures using Python
Build a gesture volume controller with OpenCV and MediaPipe. Pinch your thumb and index finger together to turn the sound down, spread them apart to turn it up.
IntermediateReal-time face detection in Python: MediaPipe vs Haar cascade
Two ways to detect faces in a webcam feed with Python. See the code for both, then a straight comparison of speed, accuracy and when each one is the right choice.
IntermediateCount fingers with MediaPipe in Python
Hold up three fingers and Python says three. Learn the landmark logic behind finger counting, including the thumb rule that trips everyone up.
IntermediateBuild an AI push-up counter with pose estimation in Python
Use MediaPipe Pose to measure your elbow angle and count push-up reps automatically. The same state machine works for squats, curls and any repeated movement.
BeginnerExtract text from an image with Python (OCR that actually works)
Tesseract plus a few lines of OpenCV preprocessing turns blurry photos into clean text. Learn the cleanup steps that take accuracy from unusable to reliable.
IntermediateBuild a Virtual Mouse with OpenCV and MediaPipe in Python
Learn how to build a virtual mouse in Python using OpenCV and MediaPipe hand tracking. Move the cursor with your index finger and click with a pinch — beginner-friendly step-by-step tutorial.