29 of 30 Summary In this lecture we looked at Sharpening filters 1 stderivative

29 of 30 summary in this lecture we looked at

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29 of 30 Summary In this lecture we looked at: – Sharpening filters • 1 st derivative filters • 2 nd derivative filters – Combining filtering techniques
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30 of 30 Combining Spatial Enhancement Methods Successful image enhancement is typically not achieved using a single operation Rather we combine a range of techniques in order to achieve a final result This example will focus on enhancing the bone scan to the right Images taken from Gonzalez & Woods, Digital Image Processing (2002)
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31 of 30 Combining Spatial Enhancement Methods (cont…) Images taken from Gonzalez & Woods, Digital Image Processing (2002) Laplacian filter of bone scan (a) Sharpened version of bone scan achieved by subtracting (a) and (b) Sobel filter of bone scan (a) (a) (b) (c) (d)
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32 of 30 Combining Spatial Enhancement Methods (cont…) Images taken from Gonzalez & Woods, Digital Image Processing (2002) The product of (c) and (e) which will be used as a mask Sharpened image which is sum of (a) and (f) Result of applying a power-law trans. to (g) (e) (f) (g) (h) Image (d) smoothed with a 5*5 averaging filter
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33 of 30 Combining Spatial Enhancement Methods (cont…) Compare the original and final images Images taken from Gonzalez & Woods, Digital Image Processing (2002)
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