Book Image

Python Image Processing Cookbook

By : Sandipan Dey
Book Image

Python Image Processing Cookbook

By: Sandipan Dey

Overview of this book

With the advancements in wireless devices and mobile technology, there's increasing demand for people with digital image processing skills in order to extract useful information from the ever-growing volume of images. This book provides comprehensive coverage of the relevant tools and algorithms, and guides you through analysis and visualization for image processing. With the help of over 60 cutting-edge recipes, you'll address common challenges in image processing and learn how to perform complex tasks such as object detection, image segmentation, and image reconstruction using large hybrid datasets. Dedicated sections will also take you through implementing various image enhancement and image restoration techniques, such as cartooning, gradient blending, and sparse dictionary learning. As you advance, you'll get to grips with face morphing and image segmentation techniques. With an emphasis on practical solutions, this book will help you apply deep learning techniques such as transfer learning and fine-tuning to solve real-world problems. By the end of this book, you'll be proficient in utilizing the capabilities of the Python ecosystem to implement various image processing techniques effectively.

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Table of Contents (11 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Sections
Get in touch
1
Image Manipulation and Transformation
Image Manipulation and Transformation
Technical requirements
Transforming color space (RGB → Lab)
Applying affine transformation
Applying perspective transformation and homography
Creating pencil sketches from images
Creating cartoonish images
Simulating light art/long exposure
Object detection using color in HSV
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2
Image Enhancement
Image Enhancement
Applying filters to denoise different types of noise in an image
Image denoising with a denoising autoencoder
Image denoising with PCA/DFT/DWT
Image denoising with anisotropic diffusion
Improving image contrast with histogram equalization
Implementing histogram matching
Performing gradient blending
Edge detection with Canny, LoG/zero-crossing, and wavelets
3
Image Restoration
Image Restoration
Restoring an image with the Wiener filter
Restoring an image with the constrained least squares filter 
Image restoration with a Markov random field
Image inpainting
Image completion with inpainting using deep learning
Image restoration with dictionary learning
Compressing an image using wavelets
Using steganography and steganalysis
4
Binary Image Processing
Binary Image Processing
Applying morphological operators to a binary image
Applying Morphological filters
Morphological pattern matching
Segmenting images with morphology
Counting objects
5
Image Registration
Image Registration
Medical image registration with SimpleITK
Image alignment with ECC algorithm and warping 
Face alignment with dlib
Robust matching and homography with the RANSAC algorithm
Image mosaicing (panorama)
Face morphing
Implementing an image search engine
6
Image Segmentation
Image Segmentation
Thresholding with Otsu and Riddler–Calvard
Image segmentation with self-organizing maps
RandomWalk segmentation with scikit-image
Human skin segmentation with the GMM-EM algorithm
Medical image segmentation
Deep semantic segmentation
Deep instance segmentation
7
Image Classification
Image Classification
Classifying images with scikit-learn (HOG and logistic regression)
Classifying textures with Gabor filter banks
Classifying images with VGG19/Inception V3/MobileNet/ResNet101 (with PyTorch)
Fine-tuning (with transfer learning) for image classification
Classifying traffic signs using a deep learning model (with PyTorch)
Estimating a human pose using a deep learning model
8
Object Detection in Images
Object Detection in Images
Object detection with HOG/SVM
Object detection with Yolo V3
Object detection with Faster R-CNN
Object detection with Mask R-CNN
Multiple object tracking with Python-OpenCV
Text detection/recognition in images with EAST/Tesseract
Face detection with Viola-Jones/Haar-like features
9
Face Recognition, Image Captioning, and More
Face Recognition, Image Captioning, and More
Face recognition using FaceNet
Age, gender, and emotion recognition using deep learning models
Image colorization with deep learning
Automatic image captioning with a CNN and an LSTM
Image generation with a GAN
Using a variational autoencoder to reconstruct and generate images
Using a restricted Boltzmann machine to reconstruct Bangla MNIST images
10
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Face morphing

The goal of image/face morphing is to find the average of two objects/faces in the images. It is not an average of two images of objects (faces); rather, it is an image of the average object (face). The very first idea that might come to mind is a two-step process:

  1. Globally align two face images (warping with an affine transformation).
  2. Cross-dissolve (a linear combination of the images with alpha-blending) to create the output image.

But this often does not work. We can again resort to (local) feature matching. For example, to do face morphing, the matching can take place between keypoints such as nose to nose, eye to eye, and so on—this is a local (non-parametric) warp.

Here are the steps of the face morphing implementation with the mesh-warping algorithm:

  1. Defining correspondences: The face morphing algorithm transforms the source face into the target...
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