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Image Captioning

توليد توصيف نصي للصور

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 Publication date 2018
and research's language is العربية
 Created by adam oudaimah




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Research summary
تتناول هذه الورقة البحثية تطوير نموذج جديد قائم على التركيز (attention-based model) لتوليد توصيف نصي للصور. يتم تدريب النموذج باستخدام تقنيات التراجع الخلفي (backpropagation) وتعظيم حد سفلي متغير عشوائيًا (variational lower bound). يتم استخدام قاعدة بيانات MS COCO لتدريب النموذج. تعتمد الورقة على استخدام الشبكات العصبونية الملتفة (CNN) لاستخلاص تمثيلات شعاعية للصور والشبكات العصبونية التكرارية (RNN) لتوليد التوصيف النصي. يتم التركيز على أهمية التركيز في أنظمة الرؤية البشرية وكيف يمكن للنموذج تصحيح الأخطاء عند توليد كلمات غير متوافقة مع الكائنات الموجودة في الصورة. يتم شرح معمارية الشبكات العصبونية الملتفة والتكرارية بالتفصيل، بالإضافة إلى كيفية تدريب النموذج باستخدام مكتبة TensorFlow. يتم تقديم نتائج التدريب على 10000 صورة من قاعدة بيانات MS COCO، حيث بلغت نسبة الدقة حوالي 70%.
Critical review
تعد الورقة البحثية مساهمة قيمة في مجال توليد التوصيف النصي للصور باستخدام نماذج التركيز. ومع ذلك، يمكن تحسينها من خلال تقديم تحليل أعمق لأداء النموذج على مجموعات بيانات مختلفة وتقديم مقارنة مع نماذج أخرى مشابهة. كما يمكن تحسين الورقة من خلال تقديم تفاصيل أكثر حول كيفية تحسين النموذج للتعامل مع الصور ذات التعقيد العالي. بالإضافة إلى ذلك، يمكن تحسين الورقة من خلال تقديم تحليل أعمق للأخطاء التي يرتكبها النموذج وكيفية تصحيحها.
Questions related to the research
  1. ما هي التقنية المستخدمة لتدريب النموذج في الورقة البحثية؟

    يتم تدريب النموذج باستخدام تقنيات التراجع الخلفي (backpropagation) وتعظيم حد سفلي متغير عشوائيًا (variational lower bound).

  2. ما هي قاعدة البيانات المستخدمة لتدريب النموذج؟

    تم استخدام قاعدة بيانات MS COCO لتدريب النموذج.

  3. ما هي نسبة الدقة التي حققها النموذج المدرب على قاعدة بيانات MS COCO؟

    بلغت نسبة الدقة حوالي 70%.

  4. ما هي الشبكات العصبونية المستخدمة في النموذج لتوليد التوصيف النصي؟

    تم استخدام الشبكات العصبونية الملتفة (CNN) لاستخلاص تمثيلات شعاعية للصور والشبكات العصبونية التكرارية (RNN) لتوليد التوصيف النصي.


References used
Show, Attend and Tell: Neural Image Caption Generation with Visual Attention. Kelvin Xu. 2016
A Critical Review of Recurrent Neural Networks for Sequence Learning. Zachary C. Lipton, John Berkowitz, Charles Elkan. June 5th, 2015
CS231n Convolutional Neural Networks for Visual Recognition
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Image captioning has conventionally relied on reference-based automatic evaluations, where machine captions are compared against captions written by humans. This is in contrast to the reference-free manner in which humans assess caption quality. In t his paper, we report the surprising empirical finding that CLIP (Radford et al., 2021), a cross-modal model pretrained on 400M image+caption pairs from the web, can be used for robust automatic evaluation of image captioning without the need for references. Experiments spanning several corpora demonstrate that our new reference-free metric, CLIPScore, achieves the highest correlation with human judgements, outperforming existing reference-based metrics like CIDEr and SPICE. Information gain experiments demonstrate that CLIPScore, with its tight focus on image-text compatibility, is complementary to existing reference-based metrics that emphasize text-text similarities. Thus, we also present a reference-augmented version, RefCLIPScore, which achieves even higher correlation. Beyond literal description tasks, several case studies reveal domains where CLIPScore performs well (clip-art images, alt-text rating), but also where it is relatively weaker in comparison to reference-based metrics, e.g., news captions that require richer contextual knowledge.

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