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DEEP LEARNING
CNN
CONVOLUTIONAL NEURAL NETWORK
Convolutional Neural Network is one of the
main categories to do image classification
and image recognition in neural networks.
Scene labeling, objects detections, and face
recognition, etc., are some of the areas
where convolutional neural networks are
widely used.
CONVOLUTIONAL LAYER
 Computers read images as pixels and it is expressed
as matrix (NxNx3) – (height by width by depth)
 The Convolutional layer makes use of a set of
learnable filters. A filter is used to detect the presence
of specific features or patterns present in the original
image (input).
 It is usually expressed as a matrix, with a smaller
dimension but the same depth as the input file.
 This filter is convolved across the width and height of
the input file and a dot product is computed to give an
activation function map.
FILTER
 Convolution filters are filters (multi-
dimensional data) used in Convolution
layer which helps in extracting specific
features from input data.
 There are different types of Filters like
Gaussian Blur, Prewitt Filter, Sobel Filter,
Canny Edge Detector and many more which
we have covered along with basic idea.
WHAT ARE FILTERS/KERNELS?
 A filter provides a measure for how close a
patch or a region of the input resembles a
feature.
 A feature may be any prominent aspect – a
vertical edge, a horizontal edge, an arch, a
diagonal, etc.
DIMENSIONS OF THE CONVOLVED OUTPUT?
If the input image size is ‘n x n’ & filter size is
‘f x f ‘, then after convolution, the size of the
output image is: (Size of input image – filter
size + 1)
PADDING
Padding basically extends the area of an image in which
a convolutional neural network processes.
The kernel/filter which moves across the image scans
each pixel and converts the image into a smaller image.
In order to work the kernel with processing in the image,
padding is added to the outer frame of the image to allow
for more space for the filter to cover in the image.
Adding padding to an image processed by a CNN allows
for a more accurate analysis of images.
THERE ARE THREE TYPE PADDING
 Same padding
 Causal padding
 Valid padding
SAME PADDING
In this type of padding, the padding layers
append zero values in the outer frame of the
images or data so the filter we are using can
cover the edge of the matrix and make the
inference with them too.
VALID PADDING
This type of padding can be considered as no
padding.
CAUSAL PADDING
This is a special type of padding and
basically works with the one-dimensional
convolutional layers.
STRIDES
When the array is created, the pixels are
shifted over to the input matrix.
The number of pixels turning to the input
matrix is known as the strides.
When the number of strides is 1, we move
the filters to 1 pixel at a time.
Similarly, when the number of strides is 2, we
carry the filters to 2 pixels, and so on.
Deep Learning.pptx

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Deep Learning.pptx

  • 2. CONVOLUTIONAL NEURAL NETWORK Convolutional Neural Network is one of the main categories to do image classification and image recognition in neural networks. Scene labeling, objects detections, and face recognition, etc., are some of the areas where convolutional neural networks are widely used.
  • 3.
  • 4. CONVOLUTIONAL LAYER  Computers read images as pixels and it is expressed as matrix (NxNx3) – (height by width by depth)  The Convolutional layer makes use of a set of learnable filters. A filter is used to detect the presence of specific features or patterns present in the original image (input).  It is usually expressed as a matrix, with a smaller dimension but the same depth as the input file.  This filter is convolved across the width and height of the input file and a dot product is computed to give an activation function map.
  • 5. FILTER  Convolution filters are filters (multi- dimensional data) used in Convolution layer which helps in extracting specific features from input data.  There are different types of Filters like Gaussian Blur, Prewitt Filter, Sobel Filter, Canny Edge Detector and many more which we have covered along with basic idea.
  • 6. WHAT ARE FILTERS/KERNELS?  A filter provides a measure for how close a patch or a region of the input resembles a feature.  A feature may be any prominent aspect – a vertical edge, a horizontal edge, an arch, a diagonal, etc.
  • 7. DIMENSIONS OF THE CONVOLVED OUTPUT? If the input image size is ‘n x n’ & filter size is ‘f x f ‘, then after convolution, the size of the output image is: (Size of input image – filter size + 1)
  • 8. PADDING Padding basically extends the area of an image in which a convolutional neural network processes. The kernel/filter which moves across the image scans each pixel and converts the image into a smaller image. In order to work the kernel with processing in the image, padding is added to the outer frame of the image to allow for more space for the filter to cover in the image. Adding padding to an image processed by a CNN allows for a more accurate analysis of images.
  • 9.
  • 10. THERE ARE THREE TYPE PADDING  Same padding  Causal padding  Valid padding
  • 11. SAME PADDING In this type of padding, the padding layers append zero values in the outer frame of the images or data so the filter we are using can cover the edge of the matrix and make the inference with them too.
  • 12. VALID PADDING This type of padding can be considered as no padding.
  • 13. CAUSAL PADDING This is a special type of padding and basically works with the one-dimensional convolutional layers.
  • 14. STRIDES When the array is created, the pixels are shifted over to the input matrix. The number of pixels turning to the input matrix is known as the strides. When the number of strides is 1, we move the filters to 1 pixel at a time. Similarly, when the number of strides is 2, we carry the filters to 2 pixels, and so on.