تشخیص نواحی مزاحم بصری در تصاویر به وسیله روش نمایش تنک دومرحله‌ای و وزن‌دار نمونه آزمون
الموضوعات :
فردین صبوری
1
,
فرزین یغمایی
2
1 - دانشگاه سمنان
2 - دانشگاه سمنان
الکلمات المفتاحية: سیستم بینایی انسانتوجه بصرینواحی برجستهمزاحمت بصریسیستم کدگذاری و بازنمایی تنک,
ملخص المقالة :
مخاطب یک تصویر مایل است که در کوتاه‌ترین زمان، پیام اصلی تصویر را دریافت کند. از این رو سیستم بینایی انسان توجه بصری را ناخودآگاه به سمت نواحی برجسته، با فرض وجود اطلاعات مفید در آنها هدایت می‌کند. عملاً این فرض همواره صادق نبوده و در مواردی، نواحی برجسته صرفاً موجب مزاحمت بصری می‌گردند. از این رو در کاربردهای مختلف نیاز به ساز و کاری جهت تشخیص این نواحی می‌باشد تا با حذف این نواحی، حواس مخاطب از سوژه اصلی تصویر پرت نشود. همچنین نادیده‌گرفتن این نواحی، کمک شایانی است به روش‌هایی که بر پایه تشخیص نواحی برجسته و مهم عمل می‌کنند. بدین منظور در این مقاله، بر اساس روش‌های منطبق بر چالش عدم توازن دسته‌ها، هر قطعه از تصاویر آموزشی با توجه به ماسک آنها به 9 دسته افراز می‌شود که شماره هر دسته متناسب با شدت مزاحمت است. سپس ویژگی‌های مبتنی بر قطعه استخراج و دسته هر قطعه بر اساس روش نمایش تنک دومرحله‌ای و وزن‌دار نمونه آزمون که بر مبنای سیستم کدگذاری و بازنمایی تنک است، تعیین می‌شود. به منظور ارزیابی دقیق روش پیشنهادی و مقایسه آن با سایر روش‌ها، 4 معیار ارزیابی با رویکردهای مختلف معرفی و پیشنهاد می‌شود. با ارزیابی و سنجش نتایج نشان داده می‌شود که روش پیشنهادی علی‌رغم زمان‌بر بودن، نسبت به کارهای پیشین دارای دقت بیشتری است.
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