A Framework of Extracting Multi-scale Features Using Multiple Convolutional Neural Networks...

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A Framework of Extracting Multi-scale Features Using Multiple Convolutional

Neural NetworksKuan-Chuan Peng

Tsuhan Chen

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Introduction

• Breakthrough progress in object classification.

O. Russakovsky et al. ImageNet large scale visual recognition challenge. arXiv:1409.0575, 2014.N. Murray et al. AVA: A Large-Scale Database for Aesthetic Visual Analysis. CVPR12.

catdog

liontiger

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Introduction

• Humans are interested in more than objects.• For example, aesthetic quality.

N. Murray et al. AVA: A Large-Scale Database for Aesthetic Visual Analysis. CVPR12.

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How do machines describe images?

• Examples by state-of-art algorithm:

A. Karpathy and F.-F. Li. Deep visual-semantic alignments for generating image descriptions. CVPR15.http://cs.stanford.edu/people/karpathy/deepimagesent/

“man in black shirt is playing guitar.”

“woman is holding bunch of bananas.”

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How do experts describe images?

• Examples by the Pulitzer Prize winners:

http://www.pulitzer.org/archives/8417http://www.pulitzer.org/archives/6451

“At bath times, Danielle appears serene. But no one know what lies beyond those eyes.” (by Lane DeGregory)

“The surgery has dragged on for hours with little progress, and Mulliken, taking a breather next to an array of Sam's CAT scans, is feeling the frustration and exhaustion.” (by Tom Hallman Jr.)

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How do experts describe images?

• Images convey more than objects.

http://www.pulitzer.org/archives/8417http://www.pulitzer.org/archives/6451

“At bath times, Danielle appears serene. But no one know what lies beyond those eyes.” (by Lane DeGregory)

“The surgery has dragged on for hours with little progress, and Mulliken, taking a breather next to an array of Sam's CAT scans, is feeling the frustration and exhaustion.” (by Tom Hallman Jr.)

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Beyond Objects

• Abstract attributes matter.– Attributes relating to or involving general ideas or

qualities rather than specific people, objects, or actions. [Merriam-Webster dictionary]

• Bridge the gap between machines and humans:– Teach machines to solve abstract tasks (tasks

involving abstract attributes).

http://www.merriam-webster.com/dictionary/abstract

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Goal

• A general framework to achieve better performance in abstract tasks.– Multi-scale features by using convolutional neural

networks (CNN).

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Why CNN?

O. Russakovsky et al. ImageNet large scale visual recognition challenge. arXiv:1409.0575, 2014.L. Deng et al. A deep convolutional neural network using heterogeneous pooling for trading acoustic invariance with phonetic confusion. ICASSP13.A. Karpathy et al. Large-scale video classification with convolutional neural networks. CVPR14.

object classificationvideo classification

speech recognition

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Existing Abstract Tasks

• More and more abstract tasks are proposed.

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Artistic Style & Artist Style Classification[F. S. Khan et al. MVA14.]

Architectural Style Classification[Z. Xu et al. ECCV14.]

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amusement anger awe contentment disgust excitement fear sadEmotion Classification

[J. Machajdik et al. ACMMM10.]

Aesthetic Classification[N. Murray et al. CVPR12.]

high aesthetic quality low aesthetic quality

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Bohemian

HipsterFashion Style Classification

[M. H. Kiapour et al. ECCV14.]

Memorability Prediction[P. Isola et al. CVPR11.]

Interestingness Prediction[M. Gygli et al. ICCV13.]

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Inspiration

• It is tricky to describe abstract attributes as objects.– Not easy to “locate” abstract attributes.

• What if abstract attributes prevail everywhere?– Label-inheritable (LI) property.

contentment[J. Machajdik et al. ACMMM10.]

?

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Label-Inheritable (LI) Property

Dataset Painting-91 [1] arcDataset [2] Caltech-101 [3]

Task Artist style classification

Architectural style classification Object classification

Label Picasso Baroque Architecture Faces

Label-inheritable Yes Partial Mostly No

[1] F. S. Khan et al. Painting-91: a large scale database for computational painting categorization. Machine Vision & Applications 14.[2] Z. Xu et al. Architectural style classification using multinomial latent logistic regression. ECCV14.[3] F.-F. Li et al. Learning generative visual models from few training examples: An incremental bayesian approach tested on 101 object categories. CVPRW04.

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Multi-Scale CNN

• Assume LI property holds for each image and the associated label.

A. Krizhevsky et al. ImageNet classification with deep convolutional neural networks. NIPS12.

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AlexNet

• The number of nodes in output layer is changed to be the number of classes in each task.


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Experimental Results

Method \ Task Artist style classification

Artistic style classification

Caltech-101 object

classification(15 / 30 training

examples per class)

Architectural style

classification(10 / 25 classes)

Previous work(baseline) 53.10 [1] 62.20 [1] 83.80 / 86.50 [2] 69.17 / 46.21

[3]Single-scale CNN

(baseline) 55.15 67.37 83.45 / 88.19 70.64 / 54.84

2-scale CNN(ours) 58.11 69.67 80.19 / 87.58 74.82 / 58.89

3-scale CNN(ours) 57.91 70.96 N/A 75.32 / 59.13

[1] F. S. Khan et al. Painting-91: a large scale database for computational painting categorization. Machine Vision & Applications 14.[2] M. D. Zeiler and R. Fergus. Visualizing and understanding convolutional networks. ECCV14.[3] Z. Xu et al. Architectural style classification using multinomial latent logistic regression. ECCV14.

classification accuracy (%)

Label-inheritable Yes Yes Mostly No Partial

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Is it because of more training data?

• What if we train one CNN with images in different scales?


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Additional Results

Method \ Task Artist style classification

Artistic style classification

Caltech-101 object

classification(15 / 30 training

examples per class)

Architectural style

classification(10 / 25 classes)

Previous work(baseline) 53.10 [1] 62.20 [1] 83.80 / 86.50 [2] 69.17 / 46.21

[3]Single-scale CNN

(baseline) 55.15 67.37 83.45 / 88.19 70.64 / 54.84

2-scale CNN(ours) 58.11 69.67 80.19 / 87.58 74.82 / 58.89

1 CNN +2-scale images 46.86 61.95 N / A 67.93 / 49.06

[1] F. S. Khan et al. Painting-91: a large scale database for computational painting categorization. Machine Vision & Applications 14.[2] M. D. Zeiler and R. Fergus. Visualizing and understanding convolutional networks. ECCV14.[3] Z. Xu et al. Architectural style classification using multinomial latent logistic regression. ECCV14.

classification accuracy (%)

Label-inheritable Yes Yes Mostly No Partial

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Conclusion

• We proposed Multi-Scale Convolutional Neural Networks (MSCNN) based on Label-Inheritable (LI) property.– Multi-scale features.

• MSCNN can outperform the state-of-art performance on datasets where LI property holds or even partially holds.

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Towards Solving Abstract Tasks

• More CNN features to achieve better performance in abstract tasks.– Multi-scale features (ICME15).– Multi-depth features (ICIP15).– Multi-task features (submitted to ICCV15).

K.-C. Peng and T. Chen. A Framework of extracting multi-scale features using multiple convolutional neural networks. ICME15.K.-C. Peng and T. Chen. Cross-layer features in convolutional neural networks for generic classification tasks. ICIP15.K.-C. Peng and T. Chen. Toward correlating and solving abstract tasks using convolutional neural networks. Submitted to ICCV15.

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Q & A

A Framework of Extracting Multi-scale Features Using Multiple Convolutional Neural Networks...

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