CNN vs FC Networks: Image Processing

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Questions and Answers

What is the primary reason CNNs have fewer trainable parameters compared to FC networks?

CNNs use pooling layers to reduce parameters

CNNs have fewer layers

FC networks are not used for image classification

The number of filter elements is fewer than the number of arrows between layers (correct)

What is the primary function of the input layer in a CNN?

To extract features from the input image

To receive and pass forward raw pixel values to subsequent layers (correct)

To reduce the spatial dimensions of the input image

To classify the input image

What is the purpose of applying multiple filters in a convolutional layer?

To reduce the number of layers in the network

To extract multiple features from the input image (correct)

To reduce the spatial dimensions of the input image

To increase the number of trainable parameters

Why are CNNs better suited for image classification compared to FC networks?

CNNs preserve dimensional relationships between image pixels Signup and view all the answers

What is the primary benefit of using convolutional layers in a CNN?

Faster and more accurate training Signup and view all the answers

What is the purpose of the convolution operation in a convolutional layer?

To extract relevant features from the input image Signup and view all the answers

What is the primary function of the pooling layer?

To extract the most important information from the previous layer Signup and view all the answers

What is the purpose of the flatten layer?

To enable the network to process the extracted features Signup and view all the answers

What is the main reason for using activation functions in CNNs?

To introduce non-linearity in the network Signup and view all the answers

What is the primary purpose of the convolutional layer?

To perform feature extraction Signup and view all the answers

What is the main purpose of the output layer?

To produce classifications for the input data Signup and view all the answers

What is the purpose of the max pooling operation?

To reduce the dimensions of the feature maps Signup and view all the answers

What is the main advantage of using CNNs?

They are capable of extracting features from images Signup and view all the answers

What is the primary function of the fully connected layers?

To make predictions based on the extracted features Signup and view all the answers

What is the main reason for each filter having a similar number of channels as the input image?

To enable feature extraction from the image Signup and view all the answers

What is the result of applying multiple filters to a grey-scale image?

Multiple feature maps Signup and view all the answers

What is the mathematical equation representing the filter operation?

Y = w * X + b Signup and view all the answers

What is the characteristic of the convolution operation?

Linear Signup and view all the answers

What is the purpose of applying filters to an image?

To extract features from the image Signup and view all the answers

How do you calculate the number of trainable parameters in a layer?

By calculating the number of filter parameters Signup and view all the answers

What is the result of applying one filter to an RGB image?

One feature map with one channel Signup and view all the answers

What determines the feature extracted by a filter?

The network during training Signup and view all the answers

Study Notes

CNN vs. Fully-Connected Network

CNNs are better than FCs when dealing with images because they preserve the dimensional relationships between image pixels.
In CNNs, the number of trainable parameters is the number of filter elements, whereas in FC networks, it's the number of arrows between each consecutive layer.
This means CNNs have a smaller number of parameters to train, resulting in faster and more accurate training.

CNN Construction

Input Layer: receives raw pixel values of the input image and passes them forward to subsequent layers for feature extraction and classification.
Convolutional Layers: perform a fundamental operation in the network, applying filters to extract relevant features.
Each filter searches for one feature in the image and applies an activation function after the convolution.
Pooling Layer: reduces the dimensions of feature maps, extracting the most important information from the previous layer.
Max Pooling is usually better than Average Pooling.
Flatten Layer: bridges convolutional layers and fully connected layers, enabling the network to process extracted features and make predictions.
Fully Connected Layers: convert the number of neurons from the flattened feature map to match the number of output classes.
Output Layer: produces classifications for the input data, consisting of neurons, each representing a class in the classification task.

CNN Model Creation

Procedure for creating a CNN model involves:
- Dataset preparation
- Applying filters to extract features
- Convolutional layers with multiple filters
- Pooling layers
- Flatten layers
- Fully connected layers
- Output layers

Convolutional Layers

Applying one filter on a grey-scale image (2D-Conv) produces a feature map.
Applying multiple filters on a grey-scale image produces multiple feature maps.
Each filter should have a similar number of channels as the input image.
Each filter extracts one feature from the image, which is not determined by humans.
The network is trained to determine this feature.
Each filter produces only one feature map.
By applying several filters, the network can detect several features from the image.
The number of trainable parameters in a layer can be calculated by counting the number of filter parameters.
The mathematical equation of a filter is Y = w * X + b, making the convolution operation a linear function.

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Description

Compare the performance of Convolutional Neural Networks (CNNs) and Fully-Connected (FC) Networks when dealing with images. Learn how CNNs preserve dimensional relationships between image pixels.