OpenCV से दस्तावेज़ की फ़ोटो को सीधा और काला-सफ़ेद करने की विधि

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यह लेख बताता है कि स्कैनर ऐप्स फ़ोन की फ़ोटो में काग़ज़ ढूँढकर, उसके कोने तय करके और उसे स्याही व काग़ज़ में बाँटकर कैसे काम करते हैं। लेखक एक काल्पनिक किराया-अनुबंध का पन्ना बनाकर उसकी फ़ोटो खींचते हैं, जिससे सटीक कोने ज्ञात रहें। काग़ज़ को अलग करने के लिए धुंधलापन, Otsu थ्रेशोल्ड और सबसे बड़े कंटूर का उपयोग किया जाता है। approxPolyDP से मिले कोने कुछ पिक्सेल दूर रहते हैं, इसलिए आसपास के किनारों को फ़िट करके उनके प्रतिच्छेदन से बेहतर कोने निकाले जाते हैं। इससे त्रुटि लगभग दो से छह पिक्सेल तक घट जाती है, और फिर पर्सपेक्टिव ट्रांसफ़ॉर्म से पन्ना सीधा किया जाता है।

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