CNNs for dense image labeling - University of Illinois at ...L. Chen, G. Papandreou, I. Kokkinos, K....

CNNs for dense image labeling

semantic segmentation instance segmentation

image classification object detection

Outline• Early “hacks”

• Hypercolumns• Zoom-out features• Fully convolutional networks

• Deep network operations for dense prediction• Transposed convolutions• Unpooling• Dilated convolutions

• Instance segmentation• Mask R-CNN

• Other dense prediction problems

Early “hacks”• Do dense prediction as a post-process on top of an image

classification CNN

Have: feature maps from image classification network

Want: pixel-wise predictions

Hypercolumns• Idea: to obtain a feature representation for an

individual pixel, upsample all feature maps to original image resolution and concatenate values from feature maps “above” that pixel

B. Hariharan, P. Arbelaez, R. Girshick, and J. Malik, Hypercolumns for Object Segmentation and Fine-grained Localization, CVPR 2015

Representation as an end-to-end network:

Zoom-out features

M. Mostajabi, P. Yadollahpour and G. Shakhnarovich, Feedforward semantic segmentation with zoom-out features,

CVPR 2015

Zoom-out features: Example results

Zoom-out features: Evaluation• Metric: mean IoU

• Intersection over union of predicted and ground truth pixels for each class, averaged over classes

Fully convolutional networks• Design a network with only convolutional layers, make

predictions for all pixels at once

J. Long, E. Shelhamer, and T. Darrell, Fully Convolutional Networks for Semantic Segmentation, CVPR 2015

Dense prediction: Outline• Early “hacks”

Fully convolutional networks

Source: Stanford CS231n

• Design a network with only convolutional layers, make predictions for all pixels at once

• Can the network operate at full image resolution?

Fully convolutional networks

Source: Stanford CS231n

• Design a network with only convolutional layers, make predictions for all pixels at once

• Can the network operate at full image resolution? • Practical solution: first downsample, then upsample

Fully convolutional networks (FCN)

Comparison on a subset of PASCAL 2011 validation data:

J. Long, E. Shelhamer, and T. Darrell, Fully Convolutional Networks for Semantic Segmentation, CVPR 2015

Upsampling in a deep network• Regular convolution (stride 1, pad 0)

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• Matrix-vector form:

4x4 input, 2x2 output

Upsampling in a deep network• Transposed convolution

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=2x2 input, 4x4 output

Not an inverse of the original convolution operation, simply reverses dimension change!

Source

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Recall: Backward pass for conv layer!"

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= '(,*

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= ∗01, 2 1, 21 + 4, 2 + 5

−4, −5

• Transposed convolution is the same operation as backwards pass for regular convolution

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output, weighted by entries of the input

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Upsampling in a deep network• 1D example

Animation: https://distill.pub/2016/deconv-checkerboard/

output

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output

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Upsampling in a deep network• Backwards-strided convolution: to increase

resolution, use output stride > 1

output

stride 1

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stride 2input

output

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stride 2input

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resolution, use output stride > 1• For stride 2, dilate the input by inserting rows and columns of

zeros between adjacent entries, convolve with flipped filter• Sometimes called convolution with fractional input stride 1/2

V. Dumoulin and F. Visin, A guide to convolution arithmetic for deep learning, arXiv 2018

outputQ: What 3x3 filter would correspond to bilinear upsampling?

12 1 1

Upsampling in a deep network• Alternative to transposed convolution:

max unpooling

1 2 6 3

3 5 2 1

1 2 2 1

7 3 4 8

Max pooling

Remember pooling indices (which

element was max)

0 0 6 0

0 5 0 0

0 0 0 0

7 0 0 8

Max unpooling

Output is sparse, so need to follow this with a transposed

convolution layer

(sometimes called deconvolution instead of transposed convolution, but this is not accurate)

DeconvNet

H. Noh, S. Hong, and B. Han, Learning Deconvolution Network for Semantic Segmentation, ICCV 2015

DeconvNet

H. Noh, S. Hong, and B. Han, Learning Deconvolution Network for Semantic Segmentation, ICCV 2015

Original image 14x14 deconv 28x28 unpooling 28x28 deconv 54x54 unpooling

54x54 deconv 112x112 unpooling 112x112 deconv 224x224 unpooling 224x224 deconv

DeconvNet results

PASCAL VOC 2012 mIoUHypercolumns 59.2ZoomOut 64.4FCN-8 62.2DeconvNet 69.6Ensemble of DeconvNet and FCN 71.7

Similar architecture: SegNet

V. Badrinarayanan, A. Kendall and R. Cipolla, SegNet: A Deep Convolutional Encoder-Decoder Architecture for Image Segmentation, PAMI 2017

Drop the FC layers, get better results

• Like FCN, fuse upsampled higher-level feature maps with higher-res, lower-level feature maps

• Unlike FCN, fuse by concatenation, predict at the end

O. Ronneberger, P. Fischer, T. Brox U-Net: Convolutional Networks for Biomedical Image Segmentation, MICCAI 2015

Summary of upsampling architectures

Figure source

Recall: Feature pyramid networks

• Improve predictive power of lower-level feature maps by adding contextual information from higher-level feature maps

• Predict different sizes of bounding boxes from different levels of the pyramid (but share parameters of predictors)

T.-Y. Lin, P. Dollar, R. Girshick, K. He, B. Hariharan, and S. Belongie, Feature pyramid networks for object detection, CVPR 2017

Dilated convolutions• Idea: instead of reducing spatial resolution of feature maps,

use a large sparse filter• Also known as à trous convolution

Image source

Dilation factor 1 Dilation factor 2 Dilation factor 3

Dilated convolutions• Idea: instead of reducing spatial resolution of feature maps,

use a large sparse filter

V. Dumoulin and F. Visin, A guide to convolution arithmetic for deep learning, arXiv 2018

output

Like 2x downsamplingfollowed by 3x3

convolution followed by 2x upsampling

Dilated convolutions

L. Chen, G. Papandreou, I. Kokkinos, K. Murphy, A. Yuille, DeepLab: Semantic Image Segmentation with Deep Convolutional Nets, Atrous Convolution, and Fully Connected CRFs, PAMI 2017

Dilated convolutions• Can be used in FCN to remove downsampling:

change stride of max pooling layer from 2 to 1, dilate subsequent convolutions by factor of 2 (in theory, can be done without re-training any parameters)

L. Chen, G. Papandreou, I. Kokkinos, K. Murphy, A. Yuille, DeepLab: Semantic Image Segmentation with Deep Convolutional Nets, Atrous Convolution, and Fully Connected CRFs, PAMI 2017

Dilated convolutions• Can increase receptive field size exponentially with a linear

growth in the number of parameters

F. Yu and V. Koltun, Multi-scale context aggregation by dilated convolutions, ICLR 2016

Feature map 1 (F1) produced from F0 by 1-dilated convolution

F2 produced from F1 by 2-dilated

convolution

F3 produced from F2 by 4-dilated

convolution

Receptive field: 3x3 Receptive field: 7x7 Receptive field: 15x15

Dilated convolutions• Context module with dilation

• Returns same number of feature maps at the same resolution as the input, so can be plugged in to replace components of existing dense prediction architectures

• Requires identity initialization

Dilated convolutions: Evaluation

Results on VOC 2012

*Front end: re-implementation of FCN-8 with last two pooling layers dropped (5% better than original FCN-8)

Dilated convolutions: Evaluation

Instance segmentation

Source: Kaiming He

Mask R-CNN

• Mask R-CNN = Faster R-CNN + FCN on RoIs

K. He, G. Gkioxari, P. Dollar, and R. Girshick, Mask R-CNN, ICCV 2017 (Best Paper Award)

Mask branch: separately predict segmentation for each possible class

Classification+regressionbranch

RoIAlign vs. RoIPool• RoIPool: nearest neighbor quantization

RoIAlign vs. RoIPool• RoIPool: nearest neighbor quantization• RoIAlign: bilinear interpolation

Mask R-CNN• From RoIAlign features, predict class label, bounding box,

and segmentation mask

Separately predict binary mask for each class with per-pixel sigmoids, use average binary cross-entropy loss

Classification/regression head from an established object detector (e.g., FPN)

Mask R-CNN

Example results

Instance segmentation results on COCO

AP at different IoUthresholds

AP for different size instances

Keypoint prediction• Given ! keypoints, train model to predict ! " ×" one-hot maps

with cross-entropy losses over "$ outputs

Recently proposed task: Panoptic segmentation

A. Kirillov et al. Panoptic segmentation. CVPR 2019

Panoptic feature pyramid networks

A. Kirillov et al. Panoptic feature pyramid networks. CVPR 2019

Panoptic feature pyramid networks

A. Kirillov et al. Panoptic feature pyramid networks. CVPR 2019

Another recent task: Amodal instance segmentation

K. Li and J. Malik. Amodal instance segmentation. ECCV 2016

Even more dense prediction problems• Depth estimation• Surface normal estimation• Colorization• ….

Depth and normal estimationPredicted depth Ground truth

D. Eigen and R. Fergus, Predicting Depth, Surface Normals and Semantic Labels with a Common Multi-Scale Convolutional Architecture, ICCV 2015

Depth and normal estimationPredicted normals Ground truth

D. Eigen and R. Fergus, Predicting Depth, Surface Normals and Semantic Labels with a Common Multi-Scale Convolutional Architecture, ICCV 2015

Estimation of everything at the same time

I. Kokkinos, UberNet: Training a Universal Convolutional Neural Network for Low-, Mid-, and High-Level Vision using Diverse Datasets and Limited Memory,

ICCV 2017

Colorization

R. Zhang, P. Isola, and A. Efros, Colorful Image Colorization, ECCV 2016

CNNs for dense image labeling - University of Illinois at ...L. Chen, G. Papandreou, I. Kokkinos, K....

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