{"id":736,"date":"2016-08-22T06:01:29","date_gmt":"2016-08-22T04:01:29","guid":{"rendered":"https:\/\/www.kurokesu.com\/main\/?p=736"},"modified":"2016-09-01T20:24:58","modified_gmt":"2016-09-01T18:24:58","slug":"unusual-tasks-with-video-files-reading-bar-codes-and-qr-codes","status":"publish","type":"post","link":"https:\/\/www.kurokesu.com\/main\/2016\/08\/22\/unusual-tasks-with-video-files-reading-bar-codes-and-qr-codes\/","title":{"rendered":"Unusual tasks with video files – reading bar-codes and qr-codes"},"content":{"rendered":"

\"IMG_1450_2r\"<\/a>A barcode is an optical, machine-readable, representation of data; the data usually describes something about the object that carries the barcode – wikipedia<\/a>. While first barcode was patented on 1952, it took quite a while until these codes were used in first grocery store on 1974. And now they are being used everywhere.<\/p>\n

While using them looks quite obvious for countless people on a daily basis, science behind making and reading is much more complicated. I will skip this hi-tech theory and jump directly to examples how to generate and decode them using some clever Python scripts and a Kurokesu C1 USB camera<\/a> connected to computer.<\/p>\n

Generating barcodes<\/h3>\n

I will be using viivakoodi<\/a> python library to generate barcodes (others like OpenCV and numpy are required, so install them before use). While there are few similar python libraries, viivakoodi supports generating CODE128 barcodes.<\/p>\n

pip install viivakoodi<\/pre>\n
Native\u00a0viivakoodi output format is SVG but I needed PNG. Quick format conversion and output file is a nice raster file.<\/p>\n