Digital Image Processing

Visuals For The Classroom

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1

Digital Image Processing

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Image Characteristics that Can Be Changed with Digital Processing

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Two Methods That Can Be Used to Adjust Contrast

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Image Contrast is Represented by a Difference in Pixel Values

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A Look Up Table Gives "Replacement" Pixel Values

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Look Up Table Values Represented by a Graph

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Three Different Look Up Tables for Changing Image Contrast

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LUTs are Selected to Give an Image Specific Contrast Characteristics

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A LUT that Looks Like High Contrast Film

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A LUT that Produces Contrast Appropriate for Chest Imaging

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A LUT that Inverts the Brightness Scale

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Windowing Separates the Pixel Value Range into three Segments

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Windows to Enhance Contrast in Different Segments of the Pixel Value Range

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14

Visibility of Detail Enhanced by the Blurred Mask Subtraction Process

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The End

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