تحسين المستندات الممسوحة ضوئيًا باستخدام المعالجة المعيارية متعددة المراحل
سجل المقالة
الصفحات
40-52الملخص
غالبًا ما تكون صور المستندات الممسوحة ضوئيًا عرضةً لتشوهات معقدة، بما في ذلك الإضاءة غير المتساوية والظلال والضباب، مما يقلل بشكل كبير من وضوح النص وأداء أنظمة التعرف الضوئي على الحروف (OCR). تقدم هذه الورقة نموذجًا معياريًا متعدد الخطوات يهدف إلى تحسين جودة المستندات من خلال معالجة كل تشوه من هذه التشوهات على حدة. يتألف تصميم النظام من وحدتين محددتين: وحدة إزالة الظلال ووحدة تقليل الضباب/التشويش. تستخدم خوارزمية إزالة الظلال تقدير الخلفية باستخدام الترشيح الوسيط وتطبيع الإضاءة، ثم خطوة تحسين باستخدام نموذج DRUNet المدرب مسبقًا لتجنب الضوضاء المتبقية، على حساب دقة تفاصيل النص. بالإضافة إلى ذلك، يستخدم نظام تقليل الضباب تقنية تحسين ناعمة تعتمد على معادلة التباين التكيفية المحدودة (CLAHE) مع التنعيم الغاوسي لتحقيق تحسين موضعي للتباين دون أي تشوهات بصرية. تشير النتائج التجريبية إلى أن النهج المعياري المقترح يُنتج خلفية أكثر وضوحًا وحوافًا أكثر دقة في النص مقارنةً بالطريقة التقليدية أحادية المرحلة. تُعدّ قياسات MSE وPSNR وSSIM وGMSD تحليلات كمية لفعالية هذا الإطار، وتُظهر النتائج تحسنًا مماثلًا في جميع أنواع المستندات.
الكلمات المفتاحية:
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المعرفات
معرف الكائن الرقمي DOI: 10.33899/jes.v35i4.61283
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