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NeuralRestoration
1.
Neural Reconstruction Applying A.I. to Art Restoration Presentation by Ed Chin December 13, 2016 ARTWORLD
2.
! Goal: Restore unseen damaged images/photographs with a content-aware neural net Can Artificial Intelligence rival humans in Semantic Image Reconstruction? Original Image Damaged Image
Restored Image
3.
Art Restoration with Deep Learning ! How would you fill in the missing information? ! Can one train a computer to have the necessary cognition to fill in the missing structural, textual and content information?
4.
Weighing Various Architectures Non-Parametric Image Matching Variational Sampling Convolutional Neural Net Adversarial Networks Contextual Awareness ✔ ✔
✔ ✔ Perceptual Awareness ✗ ✔ ✔ ✔ High Resolution ✔ ✗ ✗ ✔ Large Missing Patches ✗ ✗ ✔ ✔ Easy to Train ✔ ✔ ✗ ✗
5.
Data Mining and Image Augmentation Scrape and augment 200k artsy.net images 1 Retrieve and pre-process images 2 Train autoencoder as image generator & extract latent features 3 Simultaneously train an “adversarial” neural net to discriminate real vs. “fake” images 4 Image Restoration Application 5
6.
Retrieval and Pre-Processing Pipeline ! Images are resized and normalized for zero mean/unit variance ! 1,000 images are set aside each for validation and test set Target Image
Training Image Arbitrarily sized mask is placed randomly to “corrupt” the training image
7.
Image Generator Architecture 4 hidden convolution layers 4
hidden deconvolution layers 1024 8 x 10 feature maps MSE only Replace final dense layers. Connect output units to input units as autoencoder Not good!
8.
Deep Convolutional Generative Adversarial Networks (DCGANs) G(MSE) + D(Fake_BCE) Real Image Fake
Image D(Real_BCE) D(Fake_BCE) Generator, G() Discriminator, D() No heuristic cost functions needed!!!
9.
Key Model Insights ! Generative Adversarial Networks, since its introduction by Ian Goodfellow in 2014, is known to be very tricky to train ! A number of stabilizing measures were introduced, based on the groundbreaking paper “Unsupervised Representation Learning with Deep Convolutional Generative Adversarial Networks” by Alec Radford, Luke Metz and Soumith Chintala !
The main benefit for using adversarial networks is the model’s ability to learn its own cost function in an unsupervised fashion
10.
Sample Outputs from Test Set Damaged Image Restored Image
11.
Sample Outputs from Test Set Damaged Image Restored Image
12.
Sample Outputs from Test Set Damaged Image Restored Image
13.
Sample Outputs from Test Set Damaged Image Restored Image
14.
ArtWorld – Image Restoration App Step 1 Step
2 Step 3 Drag or Upload flawed image to website Place user defined mask on damaged area Hit repair button. Receive repaired image instantly
15.
Which one would you prefer? Damaged Image A.I. Restored Image Human Restored Image
16.
Other Commercial Applications of the DCGANs Architecture ! Learn high-order functions like reasoning, planning and prediction ! Dimension reduction/ Latent Feature Extraction (more powerful than PCA) !
Generate super resolution or up-sampled images ! Forward video prediction
17.
Contact Information Ed Chin ! Email: echin6@gmail.com ! Linkedin: ! https://www.linkedin.com/in/edwin-chin-62392b1 ! Repo: github.com/echin6/my_recent_projects
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