modifed image processing

1. Selamawit Workalemahu
Advanced biomedical image analysis
(BME-6231)
Selamawit Workalemahu
FECE
Digital image fundamentals

2. Selamawit Workalemahu
Sampling and quantization

3. Selamawit Workalemahu
Sampling and quantization

4. Selamawit Workalemahu
Pixels

5. Selamawit Workalemahu
Pixel values (slide 19)

6. Selamawit Workalemahu
Intensity resolution (slide 22)

7. Selamawit Workalemahu
Intensity resolution (slide 22)

8. Selamawit Workalemahu
Intensity resolution (slide 22)

9. Selamawit Workalemahu
Intensity resolution (slide 22)

10. Selamawit Workalemahu
Varying spatial resolution (slide 23 - 24)
1024 x 1024 512 x 512 256 x 256
128 x 128 64 x 64 32 x 32

11. Selamawit Workalemahu
Connected component analysis

12. Selamawit Workalemahu
Connected component analysis
After grayscale conversion and thresholding …
After applying component analysis in Opencv …
video

13. Selamawit Workalemahu
SVD

14. Selamawit Workalemahu
Applications of SVD
Image reconstruction

15. Selamawit Workalemahu
Applications of SVD
Image reconstruction

16. Selamawit Workalemahu
Image denoising
In ,
• The singular values in D - illustrate that
how important a content (a singular
vector) is in matrix (image) A
• Removing smaller singular values –
removing noise in an image
Original image Image with noise added
After applying
SVD for
denoising

17. Selamawit Workalemahu
Image denoising
In ,
• The singular values in D - illustrate that
how important a content (a singular
vector) is in matrix (image) A
• Removing smaller singular values –
removing noise in an image

18. Selamawit Workalemahu
Image compression
• By keeping only the largest
singular values and the
corresponding singular
vectors in the SVD, we can
reduce the size of the data
while retaining most of the
important information.
723 KB
532 KB 417 KB
308 KB 277 KB

19. Selamawit Workalemahu
Configuring python based liberaries for digital image processing
• Install visual studio code
• Install python
• Install Opencv inside Vscode – see this video
• Install Numpy check this video
• Install Matplotlib – check this video
• Install scipy