12_graphicsExample - Image Processing Example ENCMP 100...

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Image Processing: Example
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ENCMP 100 2 ©2011 by ECE, UofA Overview How to alter images using MATLAB: how to identify threshold values how to apply those values to create a mask how to use a mask to “merge” two images (replace pixels from one image with pixels from the other image) Image Processing: Example
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ENCMP 100 3 ©2011 by ECE, UofA Problem statement In the image on the right, the sky is almost white – we want to make it blue: pure blue, or blue with clouds, or Image Processing: Example
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ENCMP 100 4 ©2011 by ECE, UofA Identify values of pixels that should be replaced Build a mask from those pixels Find a picture from which we take “replacement” pixels Perform the replacement operation Procedure Image Processing: Example
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ENCMP 100 5 ©2011 by ECE, UofA Procedure: identifying values of pixels that need replacement Pick a horizontal line from the original image that crosses some of the pixels you want to replace Display RGB values for those pixels Analyze the values and identify a unique value that will be used as a threshold for creating a mask Image Processing: Example
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