Object Detection Lecture Introduction to deep learning (CNN) Idar Dyrdal
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1 Object Detection Lecture Introduction to deep learning (CNN) Idar Dyrdal
2 Deep Learning Labels Computational models composed of multiple processing layers (non-linear transformations) Used to learn representations of data with multiple levels of abstraction: Learning a hierarchy of feature extractors Each level in the hierarchy extracts features from the output of the previous layer (pixels classes) Deep learning has dramatically improved state-of-the-art in: Speech and character recognition Visual object detection and recognition Convolutional neural nets for processing of images, video, speech and signals (time series) in general Recurrent neural nets for processing of sequential data (speech, text). Level 3 Level 2 Level 1 Raw data (images, video, signals) 2
3 Deep Learning for Object Recognition «Ship» (AlexNet) Millions of images Millions of parameters Thousands of classes 3
4 Traditional supervised learning Class labels Training images Feature extraction Classifier training Classifier 4
5 Deep learning Class labels Learning of weights in the processing layers Supervised, unsupervised (or semisupervised) learning Training images Feature extraction Classifier training Classifier 5
6 Semi-supervised learning Labeled samples and (trained) linear decision boundary Labeled and unlabeled samples and nonlinear decision boundary 6
7 Artificial Neural Network (ANN) Used in Machine Learning and Pattern Recognition: Regression Classification Clustering Applications: Speech recognition Recognition of handwritten text Image classification Network types: Feed-forward neural networks Recurrent neural networks (RNN) Feed-forward ANN (non-linear classifier) 7
8 Mark 1 Perceptron (Rosenblatt, ) (Cornell Aeronautical Laboratory) 8
9 Activation functions Sigmoid (logistic function): Biological neuron: Hyperbolic tangent: Rectified linear unit (ReLU): (Quasar Jarosz, English Wikipedia) 9
10 Feed-forward neural network l k j i 10
11 Back-propagation l k j i 11
12 Convolutional Neural Network (CNN) Used in Machine Vision and Image Analysis: Speech Recognition Image Recognition Video Recognition Image Segmentation Convolutional neural network: Multi-layer feed-forward ANN Combinations of convolutional and fully connected layers Convolutional layers with local connectivity Shared weights across spatial positions Local or global pooling layers (A. Karpathy) 12
13 Typical CNN Learned features (Aphex34) 13
14 Convolutional neural net Feature map Normalization Spatial pooling Non-linearity Input image Convolution (learned) (credit: S. Lazebnik) Input image 14
15 Convolutional neural net Feature map Normalization... Spatial pooling Non-linearity Input (credit: S. Lazebnik) Feature Map Convolution (learned) Input image 15
16 Convolutional neural net Feature map Rectified Linear Unit (ReLU) Normalization Spatial pooling Non-linearity (credit: S. Lazebnik) Convolution (learned) Input image 16
17 Convolutional neural net Feature map Max pooling Normalization Spatial pooling Max-pooling: a non-linear down-sampling Non-linearity Provide translation invariance Convolution (learned) (credit: S. Lazebnik) Input image 17
18 Convolutional neural net Feature map Normalization Spatial pooling Feature Maps Feature Maps After Contrast Normalization Non-linearity (credit: S. Lazebnik) Convolution (learned) Input image 18
19 Convolutional neural net Feature map Normalization Spatial pooling Non-linearity Feature maps after contrast normalization Convolution (learned) (credit: S. Lazebnik) Input image 19
20 Example - Caffe Demos 20
21 21
22 22
23 Example - Semantic Segmentation (SegNet) 23
24 Summary Topics covered: Deep learning Artificial neural networks Convolutional neural networks More information: Szeliski, chapter 14 Yann LeCun,Yoshua Bengio & Geoffrey Hinton, Deep learning, Nature, Vol 521, 28. May Shaohuai Shi, Qiang Wang, Pengfei Xu, Xiaowen Chu, Benchmarking State-of-the-Art Deep Learning Software Tools, 2017 ( Software: Caffe ( TensorFlow ( MatConvNet ( 24
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