ارزیابی ویژگی پایداری رنگ در برخی از اسکناس‌های رایج ملی تحت منابع نوری مختلف

نوع مقاله : مقاله پژوهشی

نویسنده

گروه پژوهشی نمایش رنگ و پردازش تصاویر رنگی، پژوهشگاه رنگ، تهران، ایران

10.30509/jcst.2025.167699.1274

چکیده

در این پژوهش، پایداری رنگ دو اسکناس رایج ملی (۱۰ و ۵۰ هزار تومانی) با چهار روشنایی استاندارد D65، A، TL84 و LED سفید بررسی شد. نتایج نشان داد بیشترین حجم گستره رنگی در روشناییD65  به‌ترتیب برابر با ۱۷۸,۷۵۷ واحد برای اسکناس ۱۰ هزار تومانی و ۱۱۸,۰۴۷ واحد برای اسکناس ۵۰ هزار تومانی بود، در حالی که کمترین مقدار در روشناییA  (۱۵۳,۵۲۹ و ۱۰۰,۷۴۱ واحد) مشاهده شد. میانگین شاخص ناپایداری رنگ برای جفت روشنایی‌های D65-A، D65-TL84 و D65-LED به ترتیب ۲.۴۶، ۲.۴۳ و ۱.۳۱ محاسبه شد. آزمونANOVA  دوطرفه نشان داد که هر دو عامل نوع اسکناس و نوع منبع نوری بر پایداری رنگ اثر معنادار دارند. این نتایج بیانگر آن است که اسکناس‌ها با نورهای سفید مصنوعی (LED  و TL84) پایداری رنگ بیشتری نسبت به نور تنگستن دارند و روش کمی ارائه‌شده می‌تواند برای کنترل کیفیت چاپ اسکناس‌ها مورد استفاده قرار گیرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of Color Constancy Characteristics in Selected Common National Banknotes under Different Illuminants

نویسنده [English]

  • Mahdi Safi
Department of Color Imaging and Color Image Processing, Institute for Color Science and Technology, Tehran, Iran
چکیده [English]

This study evaluated the color constancy of two Iranian banknotes (10,000 and 50,000 tomans) under four illuminants D65, A, TL84, and white LED. The largest color gamut volumes were observed under D65, with 178,757 units for the 10,000-toman note and 118,047 units for the 50,000-toman note, while the smallest volumes occurred under illuminant A (153,529 and 100,741 units, respectively). The average color inconstancy indices (CMCCON02) for the D65-A, D65-TL84, and D65-LED pairs were 2.46, 2.43, and 1.31, respectively. Two-way ANOVA confirmed significant effects of both banknote type and illuminant on color stability. These findings indicate higher color constancy under artificial white light (LED and TL84) than under tungsten light, and demonstrate the applicability of the proposed quantitative protocol for quality control in banknote printing.

کلیدواژه‌ها [English]

  • Color constancy Color inconstancy index Illumination
  • Banknotes CIELAB color space

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