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Hands-On Image Processing with Python

Hands-On Image Processing with Python

By : Sandipan Dey
3 (5)
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Hands-On Image Processing with Python

Hands-On Image Processing with Python

3 (5)
By: Sandipan Dey

Overview of this book

Image processing plays an important role in our daily lives with various applications such as in social media (face detection), medical imaging (X-ray, CT-scan), security (fingerprint recognition) to robotics & space. This book will touch the core of image processing, from concepts to code using Python. The book will start from the classical image processing techniques and explore the evolution of image processing algorithms up to the recent advances in image processing or computer vision with deep learning. We will learn how to use image processing libraries such as PIL, scikit-mage, and scipy ndimage in Python. This book will enable us to write code snippets in Python 3 and quickly implement complex image processing algorithms such as image enhancement, filtering, segmentation, object detection, and classification. We will be able to use machine learning models using the scikit-learn library and later explore deep CNN, such as VGG-19 with Keras, and we will also use an end-to-end deep learning model called YOLO for object detection. We will also cover a few advanced problems, such as image inpainting, gradient blending, variational denoising, seam carving, quilting, and morphing. By the end of this book, we will have learned to implement various algorithms for efficient image processing.
Table of Contents (20 chapters)
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Title Page
Copyright and Credits
Dedication
About Packt
Contributors
Preface
Index

Nonlinear noise smoothing


Nonlinear (spatial) filters also operate on neighborhoods and are implemented by sliding a kernel (mask) over an image like a linear filter. However, the filtering operation is based conditionally on the values of the pixels in the neighborhood, and they do not explicitly use coefficients in the sum-of-products manner in general. For example, noise reduction can be effectively done with a non-linear filter whose basic function is to compute the median gray-level value in the neighborhood where the filter is located. This filter is a nonlinear filter, since the median computation is a non-linear operation. Median filters are quite popular since, for certain types of random noise (for example, impulse noise), they provide excellent noise-reduction capabilities, with considerably less blurring than linear smoothing filters of similar size. Non-linear filters are more powerful than linear filters; for example, in terms of suppression of non-Gaussian noise such as spikes...

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