stem/AI/Neural Networks/CNN/FCN/FCN.md
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STEM/AI/Neural Networks/CNN/Examples.md
STEM/AI/Neural Networks/CNN/FCN/FCN.md
STEM/AI/Neural Networks/CNN/FCN/ResNet.md
STEM/AI/Neural Networks/CNN/FCN/Skip Connections.md
STEM/AI/Neural Networks/CNN/GAN/DC-GAN.md
STEM/AI/Neural Networks/CNN/GAN/GAN.md
STEM/AI/Neural Networks/CNN/Interpretation.md
STEM/AI/Neural Networks/CNN/UpConv.md
STEM/AI/Neural Networks/Deep Learning.md
STEM/AI/Neural Networks/MLP/MLP.md
STEM/AI/Neural Networks/Properties+Capabilities.md
STEM/AI/Neural Networks/SLP/Least Mean Square.md
STEM/AI/Neural Networks/SLP/SLP.md
STEM/AI/Neural Networks/Transformers/Transformers.md
STEM/AI/Properties.md
STEM/CS/Language Binding.md
STEM/CS/Languages/dotNet.md
STEM/Signal Proc/Image/Image Processing.md
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Fully [Convolution](../../../../Signal%20Proc/Convolution.md)al Network
[Convolutional](../Convolutional%20Layer.md) and [up-convolutional layers](../UpConv.md) with [ReLu](../../Activation%20Functions.md#ReLu) but no others (pooling)
- All some sort of Encoder-Decoder
Contractive → [UpConv](../UpConv.md)
# Image Segmentation
- For visual output
- Previously image $\rightarrow$ vector
- Additional layers to up-sample representation to an image
- Up-[convolution](../../../../Signal%20Proc/Convolution.md)al
- De-[convolution](../../../../Signal%20Proc/Convolution.md)al
![fcn-uses](../../../../img/fcn-uses.png)
![fcn-arch](../../../../img/fcn-arch.png)
# Training
- Rarely from scratch
- Pre-trained weights
- Replace final layers
- [FC](../../MLP/MLP.md) layers
- White-noise initialised
- Add [UpConv](../UpConv.md) layer(s)
- Fine-tune train
- Freeze others
- Annotated GT images
- Can use summed per-pixel log [loss](../../Deep%20Learning.md#Loss%20Function)
# Evaluation
![fcn-eval](../../../../img/fcn-eval.png)
- SDS
- Classical method
- 52% mAP
- FCN
- 62% mAP
- Intersection over Union
- IOU
- Jaccard
- Averaged over all images
- $J(A,B)=\frac{|A\cap B|}{|A\cup B|}$