Ceng 466 Fundamentals of Image Processing Manipulation of

Ceng 466 Fundamentals of Image Processing Manipulation of Images by Computer

What is Image?

Image: Visual Information • • 2 -d: binary, gray level, color (pictures, photos, etc) 3 -d: debth info (drawings, holograms etc. ) Multispectral: (sattellites images) Ultrasound (medical images) Mr (meterials, medical) Thermal (security cameras) IR ( defence) X-ray (medical)

Image Processing • Image: Visual Information • Processing: Series of actions or operations leading to a desired result Algorithms

Computer imaging • Image processing: – output image for human consumption • Computer vision – output image for use of computer • Computer graphics – Computer generates image

Computer Imaging • • • Linear Algebra Probability Algorithms Discrete geometry Color science Data structure IP CV CG

Image Processing Steps 1. Pre processing: Sampling and quantization, 2. Enhancement – Improve and accentuate some properties according to HVS • • Detect the edges, Sharpen the edges, adjust contrast, improve brightness, smooth the noise Etc 3. Compression: Reduce the amount of data with max info 4. Restoration

Image Processing Steps 5. Feature extraction: Higher level of info 6. Segmentation: Partition the homogeneous regions 7. Pattern recognition: Classify and label the objects

Sampling: Digitize Image in space

Sampling

Quantization: Digitize Brihtness values

Enhencement: Zooming Interpolation

Enhancement: Smoothing

Enhancement: Edge Detection

Image Enhancement in the Frequency Domain

3. Compression: Reducing the amount of data with maximum info

3. Compression: Reducing the amount of data with maximum info

3. Compression: Reducing the amount of data with maximum info

Compression depends on the Image content

4. Restoration: Recover the original image by removing the noise

5. Image Segmentation

6. Object Recognition

6. Object Recognition