# The DUT-OMRON Image Dataset

## What's New

<2018-01-22 Mon> We have removed four images (img_561715398.jpg, sun_bqfgwnmzhjwuphdi.jpg, sun_bswlalhygmnrhvuw.jpg, sun_buaqzytduodbufcb.jpg) from dataset due to the lack of corresponding pixel-wise ground-truth. If you have already downloaded our dataset, please delete the four images from your image dataset, eye-fixation and bounding box ground-truth folders, or you can re-download new data from DUT-OMRON Dataset Images,Bounding Box Ground-truth and Eye Fixation Ground-truth. We thank Xianghuan Duan who reported the bug.

## Introduction

Recent years have witnessed significant improvements in saliency detection methods 1-13 17-19. The experimental results on the existing datasets 8,14 have reached a very high level, hardly to surpass for subsequent research whereas the images in those datasets are much simpler than real nature images. Thus we introduce a new database, DUT-OMRON, with nature images for the research of more applicable and robust methods in both salient object detection and eye fixation prediction.

The proposed database consists of $$5,168$$ high quality images manually selected from more than $$140,000$$ images. We resize the images to $$400\times x$$ or $$x\times 400$$ pixels, where $$x$$ is less than $$400$$. Images of our database have one or more salient objects and relatively complex background. We have $$25$$ participants in all for collecting the ground truth, five participants' labels for each image. All of them have normal or corrected to normal vision and are aware of the goal of our experiment. We construct pixel-wise ground truth, bounding box ground truth and eye-fixation ground truth for the proposed database.

Our dataset is the only dataset which has both the eye fixations, bounding box and the pixel-wise ground truth in such large scale. Compared with the ASD and MSRA datasets and some other eye-fixation datasets (i.e., the MIT 15 and NUSEF 16 datasets), images in the proposed dataset are more difficult, thus more challenging, and provide more space of improvement for related research in saliency detection.

### Contact information

This website is maintained by Xiang Ruan ( ruanxiang at tiwaki dot com ), if you find bug or have concern about this website, shoot me an email.

Name Email Affiliation
Huchuan Lu lhchuan at dlut dot edu dot cn Dalian University of Technology
Xiang Ruan ruanxiang at tiwaki dot com tiwaki Co.,Ltd.

## Dataset

### Pixel-wise data

We provide pixel-wise ground truth for all the images in the dataset, which are more accurate than bounding box ground truth for evaluation of saliency models. The third row of Figure 1 shows some examples of pixel-wise ground truth.

#### Experimental results based on pixel-wise ground truth

We evaluate 17 methods 1-13, 17-19 on our dataset using the pixel-wise ground truth. Figure 2 shows the P-R curves and F-Measure results of 17 methods.

### Bounding box data

For each image, the participants are asked to draw several rectangles which enclose most salient objects in the image while the number of the rectangles is decided by their own understanding of the image. We obtain five participants' annotations and at least five rectangles for each image. In order to get a consistent mask among the five participants, fist we utilize each person's annotations to get a binary mask. Then the final ground truth is generated based on the average of five binary masks. The fourth row of Figure 1 shows some examples of gray-level bounding box ground truth.

#### Experimental results based on bounding box ground truth

We evaluate 17 methods 1-13,17-19 on our dataset to test both the methods and the dataset using Precision and Recall (P-R) curves and F-Measure as the evaluation criteria. The results are shown in Figure 3. ( please also check saliency maps of the 14 methods and sample of saliency maps ). The evaluation results on our dataset are basically consistent with the results on other datasets, which further indicates the reliability and feasibility of the DUT-OMRON dataset.

### Eye-fixation data

We use an eye tracking apparatus, Tobbii X1 Light Eye tracker, to record eye fixations when the participant focuses on the input image shown in the monitor. Each image is displayed for 2 seconds with no intervals between successive images. Five viewers' eye tracking data are recorded for every image of the dataset.

We take the following four steps to exclude the outliers from the original data:

• Firstly, the first fixation of an image from each participant is discarded to avoid the influence of center bias.
• Secondly, by using the human labeled bounding box ground truth, the outliers outside the labeled rectangles are removed, which means any fixations within any viewer's rectangle will be retained. Most of the outliers are removed in this step.
• Thirdly, K-means algorithm is used to classify the points into three clusters since we have more than one object in most of the images.
• Lastly, we retain 90% of the fixations based on Euclidean distance from the cluster center.

After removing outliers, $$153$$ reliable eye fixations on average are retained for each image and over $$95\%$$ of the images have more than $$50$$ eye fixations. Figure 4 shows some examples of the eye-fixation ground truth before versus after removing outliers.

#### Analysis of the eye fixation ground truth

We convolve a Gaussian filter across each fixation location and compute the sum of all the maps to generate a continuous saliency map after normalizing to $$[0,1]$$, as shown in Figure 5. We take similar method as 15 to threshold this map to get a binary map. A disadvantage is found in 15 (take the top $$n$$ percent of the image as salient). When the salient region is smaller than $$n\%$$ of the image, the corner will be identified as saliency, which is meaningless. Therefore we take the gray level as the threshold. Figure 5 shows some samples of the binary maps when the threshold $$n$$ is set to $$0.1$$.

We can see that this measure only formulate a rough fixation density map based on fixation locations, not accurate enough for quantitative performance evaluation. These density maps afford a representation for which similarity to saliency map may be considered at a glance by human eye in qualitative evaluation.

• Center bias. We compute the sum of all the continuous saliency maps of all the $$5172$$ images and normalize it within $$[0,1]$$. The average saliency map is shown in Figure 6. It demonstrates our dataset has a bias for human fixations to be near the center of the image.

• Consistency of the five participants. We utilize an ROC metric 15 to evaluate the consistency of the five subjects. The saliency maps from one subject’s fixation locations is treated as a binary classifier on every pixel in the image and fixation points from all the five subjects are used as ground truth. Figure 7 shows the ROC curves of the five subjects. The results demonstrate the eye fixation data have a high consistency among subjects.

#### Experimental results based on eye-fixation ground truth

We introduce an ROC 15 method for the evaluation of eye-fixation prediction models. First, the saliency maps are thresholded at top $$n$$ percent of the image for binary masks according to the gray level, where $$n=1,3,5,10,15,20,25,30$$. Then for each binary mask, we compute the percentage of human fixations within salient area of the map as the performance (vertical coordinate) and the threshold is set as horizontal coordinate. By defining the threshold using other method (i.e. take the gray level as the threshold), we can also evaluate other models.

It's not fair to compare eye-fixation prediction models with saliency detection models. Thus we only evaluate three eye-fixation prediction algorithms, the GB 11, CA 10 and IT98 9 methods, using this evaluation criteria.

Figure 8 shows the evaluation results, where the human model is the Gauss-filtered saliency maps based on the eye-fixations of one participant in our experiment. The results indicate a big space for eye-fixation prediction models to improve.

### Please cite our paper if you use our dataset in your research

Chuan Yang, Lihe Zhang, Huchuan Lu, Xiang Ruan, Minghsuan Yang, "Saliency Detection Via Graph-Based Manifold Ranking", CVPR2013, P3166-3173

or by bibtex

@inproceedings{yang2013saliency,
title={Saliency detection via graph-based manifold ranking},
author={Yang, Chuan and Zhang, Lihe and Lu, Huchuan, Ruan, Xiang and Yang, Ming-Hsuan},
booktitle={Computer Vision and Pattern Recognition (CVPR), 2013 IEEE Conference on},
pages={3166--3173},
year={2013},
organization={IEEE}
}


You can download the source code of manifold ranking saliency from github for both

### Detailed introduction of the dataset refer to our FCV14 paper

Xiang Ruan, Na Tong, Huchuan Lu "How far we away from a perfect visual saliency detection - DUT-OMRON: a new benchmark dataset", FCV2014

## References

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## Access map

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