Cropping scanned answer sheets with a QR code as the anchor (Python + OpenCV)
I'm an elementary school teacher in Korea and I build small tools for my own grading. The slowest part was never the grading itself. It was sorting…
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Zero-Latency Motion Tracking with OpenCV
Heavy machine learning models don't work everywhere, especially not on the edge where computing power is not as good. I have recently developed a si…
A five-corner label broke my OpenCV capture loop
A shipping label looked complete in a GLS parcel photograph. My capture loop asked for another photo with all four edges visible. The failure starte…
WiFi QR codes: the five escapes, the all-hex SSID trap, and what ECC level H costs you
The payload behind a "join this network" QR code is a single line of text: WIFI:T:WPA;S:cafe-wifi;P:p@ssw0rd;; Worth knowing up front: this is not a…
Resolving Algorithm Output Inconsistencies When Porting Computer Vision from Python OpenCV to Niche Frameworks
Introduction Porting computer vision algorithms across frameworks—such as from Python with OpenCV to a niche image processing platform—inevitably ex…
Testing Face Embedding Nearest Neighbor Search with OpenCV SFace
Testing Face Embedding Nearest Neighbor Search with OpenCV SFace Hello, everyone. Face recognition can sound like a big topic, but technically it ca…
OpenCV.js Without the Memory Leaks: Chainable Image Processing for Every JavaScript Runtime
If you have ever used OpenCV.js in production, you already know the bug. A user uploads ten images in a row. The third one throws inside your blur s…