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Food Categories Classification

This repository contains the dataset and the source code for the classification of food categories from meal images.

The Food and Food Categories (FFoCat) Dataset

Here you can download the FFoCat.zip file, unzip it in your local machine. The dataset is already divided into the train and test folder. The file label.tsv contains the food labels, the file food_food_category_map.tsv contains the food labels with the corresponding food category labels. The following table compares the FFoCat dataset with previous datasets for food recognition. The Type column refers to the number of labels in each image. Single (S) means only one label per image, Multi (M) means many labels per image.

1. Taichi Joutou, Keiji Yanai: A food image recognition system with Multiple Kernel Learning. ICIP 2009: 285-288;
2. Mei Chen, Kapil Dhingra, Wen Wu, Lei Yang, Rahul Sukthankar, Jie Yang: PFID: Pittsburgh fast-food image dataset. ICIP 2009: 289-292;
3. Anand Mariappan, Marc Bosch, Fengqing Zhu, Carol J. Boushey, Deborah A. Kerr, David S. Ebert, Edward J. Delp: Personal dietary assessment using mobile devices. Computational Imaging 2009: 72460;
4. Hajime Hoashi, Taichi Joutou, Keiji Yanai: Image Recognition of 85 Food Categories by Feature Fusion. ISM 2010: 296-30;
5. Chen Mei-Yun, Yung-Hsiang Yang, Chia-Ju Ho, Shih-Han Wang, Shane-Ming Liu, Eugene Chang, Che-Hua Yeh, Ming Ouhyoung: Automatic chinese food identification and quantity estimation. SIGGRAPH Asia 2012: 29;
6. Yoshiyuki Kawano, Keiji Yanai: Real-Time Mobile Food Recognition System. CVPR Workshops 2013: 1-7 ;
7. Lukas Bossard, Matthieu Guillaumin, Luc J. Van Gool: Food-101 - Mining Discriminative Components with Random Forests. ECCV (6) 2014: 446-461;
8. Yoshiyuki Kawano, Keiji Yanai: FoodCam-256: A Large-scale Real-time Mobile Food RecognitionSystem employing High-Dimensional Features and Compression of Classifier Weights. ACM Multimedia 2014: 761-762;
9. Giovanni Maria Farinella, Dario Allegra, Filippo Stanco: A Benchmark Dataset to Study the Representation of Food Images. ECCV Workshops (3) 2014: 584-599;
10. Joachim Dehais, Marios Anthimopoulos, Sergey Shevchik, Stavroula G. Mougiakakou: Two-View 3D Reconstruction for Food Volume Estimation. IEEE Trans. Multimedia 19(5): 1090-1099 (2017);
11. Jingjing Chen, Chong-Wah Ngo: Deep-based Ingredient Recognition for Cooking Recipe Retrieval. ACM Multimedia 2016: 32-41;
12. Gianluigi Ciocca, Paolo Napoletano, Raimondo Schettini: Food Recognition: A New Dataset, Experiments, and Results. IEEE J. Biomedical and Health Informatics 21(3): 588-598 (2017);
13. Gianluigi Ciocca, Paolo Napoletano, Raimondo Schettini: Learning CNN-based Features for Retrieval of Food Images. ICIAP Workshops 2017: 426-434;

Every food label has (on average) almost 389 example pictures and every food categories has (on average) approximately 4915 examples. The huge amount of data for the multilabel classification makes the problem easier with respect to a food recognition (and food categories inference) setting. However, this is counterbalanced with the distribution of the labels in the dataset. For the food recognition task the dataset is quite balanced. Regarding the food category recognition the dataset is unbalanced and presents the so-called long-tail problem: many labels with few examples.

AGROVOC Alignment of Food Categories

The AGROVOC_alignment.tsv file contains the alignment of the food categories in the FFoCat dataset with AGROVOC, the standard ontology of the Food and Agriculture Organization (FAO) of the United Nations. This allows interoperability and linked open data navigation. Such alignment can be derived by querying HeLis, here we propose a shortcut.

Citing FFoCat

If you use FFoCat in your research, please use the following BibTeX entry.

@inproceedings{DonadelloD19Ontology,
  author    = {Ivan Donadello and Mauro Dragoni},
  title     = {Ontology-Driven Food Category Classification in Images},
  booktitle = {{ICIAP} {(2)}},
  series    = {Lecture Notes in Computer Science},
  volume    = {11752},
  pages     = {607--617},
  publisher = {Springer},
  year      = {2019}
}

Using the Source Code

• The models folder will contain the multiclass and multilabel models after the training;
• The history folder will contain the accuracies and losses of the multiclass and multilabel models after the training;
• The results folder will contain the precision-recall curves results for the trained models after the evaluation.

Requirements

We train and test the models with the following software configuration. However, more recent versions of the libraries could also work:

• Ubuntu 14.04;
• Python 2.7.6;
• Keras 2.1.3;
• TensorFlow 1.4.0;
• Numpy 1.13.1;
• Scikit-learn 0.18.1;
• Matplotlib 1.5.1;

Training a model

Before training a model set in food_category_classification.py the following variables:

• TYPE_CLASSIFIER if you want to train the multiclass or multilabel model. It takes the values multiclass or multilabel;
• DATA_DIR that is your local path to the FFoCat folder.

To run a train use the following command

python food_category_classification.py

Models will be saved in the models folder.

Evaluating a model

Before evaluating a model set in evaluation_classifier.py the following variables:

• TYPE_CLASSIFIER if you want to test the multiclass or multilabel model. It takes the values multiclass or multilabel;
• DATA_DIR as above;
• USE_PREDICTION_SCORE useful only for the multiclass classification. If you want to use the classification score for the inferred food category labels set it to True, False otherwise.

To run the evaluation use the following command

python evaluation_classifier.py

Results will be saved in the results folder.