How To Write A Screen Scraper

[Kevin Norman] got himself a acute anatomy calibration with the ambition of logging abstracts for his own analysis, but apparent that extracting abstracts from the accessory was annihilation but easy. It turns out that the alone way to admission abstracts from his calibration is by examination it in a adaptable app. Screen-scraping is a accustomed adjustment of affairs abstracts from annoying systems, so [Kevin] committed to consistently demography a full-height screenshot from the app and application optical appearance acceptance (OCR) to get the numbers, but authoritative that assignment was a decidedly continued action abounding of asleep ends.

First of all, while OCR can be reliable, it needs the appropriate conditions. One affair that concluded up actuality a big botheration was the way the app appends units (kg, %) afterwards the numbers. Not alone are they tucked in actual close, but they’re about bisected the acme of the numbers themselves. It turns out that bond and analogous appearance height, in accession to snugging them up adjoin one another, is article custom-built to accord OCR believability problems.

The band-aid for this accurate affair came from an abrupt angle. [Kevin] was application an open-source OCR affairs alleged Tesseract, and abutting an IRC association #tesseract to ask for admonition afterwards backbreaking his own options. The absent associates of the online association abreast [Kevin] that they had annihilation to do with OCR; #tesseract was absolutely a association for an open-source 3D FPS ballista of the aforementioned name. But as luck would accept it, one of the associates absolutely had OCR acquaintance and appropriate the acceptable approach: pre-process the angel with OpenCV, application cv2.findContours() to ascertain and actualize a bonds box about anniversary element. If an aspect is taller than a decimal point but beneath than aggregate else, bandy it out. With that done, there were still a few added tweaks required, but the accomplishment band was assuredly in sight.

Now [Kevin] can use the calibration in the morning, booty a screenshot, and in beneath than bisected a minute the after-effects are alien into a database and visualizations generated. The consistent workflow ability attending like article Rube Goldberg would accept of, but it works!

How To Write A Screen Scraper – How To Write A Screen Scraper
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