As discussed in the Chapter 1, Getting Started with Image Processing, the point-wise intensity transformation operation applies a transfer function, T, to each pixel, f(x,y), of the input image to generate a corresponding pixel in the output image. The transformation can be expressed as g(x,y) = T(f(x,y)) or, equivalently, s = T(r), where r is the gray-level of a pixel in the input image and s is the transformed gray-level of the same pixel in the output image. It's a memory-less operation, and the output intensity at the location,(x, y), depends only on the input intensity at the same point. Pixels of the same intensity get the same transformation. This does not bring in new information and may cause loss of information, but can improve the visual appearance or make features easier to detect—that is why these transformations are often applied at the pre-processing step in the image processing pipeline. The following screenshot...
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Sandipan Dey is a data scientist with a wide range of interests, covering topics such as machine learning, deep learning, image processing, and computer vision. He has worked in numerous data science fields, working with recommender systems, predictive models for the events industry, sensor localization models, sentiment analysis, and device prognostics. He earned his master's degree in computer science from the University of Maryland, Baltimore County, and has published in a few IEEE Data Mining conferences and journals. He has earned certifications from 100+ MOOCs on data science, machine learning, deep learning, image processing, and related courses. He is a regular blogger (sandipanweb) and is a machine learning education enthusiast.
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Sandipan Dey is a data scientist with a wide range of interests, covering topics such as machine learning, deep learning, image processing, and computer vision. He has worked in numerous data science fields, working with recommender systems, predictive models for the events industry, sensor localization models, sentiment analysis, and device prognostics. He earned his master's degree in computer science from the University of Maryland, Baltimore County, and has published in a few IEEE Data Mining conferences and journals. He has earned certifications from 100+ MOOCs on data science, machine learning, deep learning, image processing, and related courses. He is a regular blogger (sandipanweb) and is a machine learning education enthusiast.
Read more about Sandipan Dey