Source & Courtesy: Jong-Il Park Hanyang University Computer Vision Introduction Source & Courtesy: Jong-Il Park Hanyang University

This Class Goal Understanding basic concepts and methodologies for image processing(IP) Developing a foundation for further study and research in IP and computer vision(CV) Learning how to develop IP/CV software How? Lectures: 3 hours/week Ordinary lecture(3/4) Programming lesson(1/4) Assignments: 2~3/month

Background Probability Theory and Random Process Linear Algebra Signals and Systems Digital Signal Processing C/C++ programming skill

Images

What is Image? picture size  picture resolution ; 256256, 512512 0  f(x,y)  L(=255) ; gray level, 8bit/pixel (x,y) ;spatial coordinate t ;temporal coordinate

Image formation

Image Coordinate

; M×N matrix ; aij= f (x=i, y=j)

Spatial Resolution

Gray-Level Resolution 16 8 256 128 4 2 64 32

Functional form Functional forms f(x,y) : 2-D still image f(x,y,t), f(x,y,z) : video sequence, 3D object f(x,y,z,t) : moving 3-D object Meaning brightness(luminance) or color of an object TV camera, scanner absorption characteristics of objects(especially bodies) X-ray imaging, Ultrasonic imaging, CT distance between objects and measuring instrument sonar imaging, radar imaging, range camera temperature of an object IR(infrared) camera

Famous Images Lena (512*512) Barboon (512*512) Boat (512*512)

First photograph First photograph due to Niepce, First on record shown - 1822 Basic abstraction is the pinhole camera First successful commercial photograph due to Eastman in late 19th

First digital picture

First digital image processing Early 1960s

DIP in medical imaging Late 1960s and early 1970s Computed tomography(CT) Recent Application NIKS Hanyang Univ. 2002.

EM spectrum

Examples: Gamma-ray imaging

Examples: X-ray imaging

Examples: Microscopy images

Thematic bands

Examples: Multi-spectral imaging

Examples: Imaging in the visible band

Examples: Infrared imaging Nighttime Lights of The World

Examples: Microwave imaging Radar image

Examples: Radio band imaging

Examples: Ultrasound imaging

Examples: Electron microscope Scanning Electron Microscope

Examples: Computer-generated images

IP vs. Computer Vision Vision continuum Image processing Image analysis Computer vision Low-level Mid-level High-level Filtering Enhancement Restoration Edge detection Compression Segmentation Classification Recognition AI Image-in Feature-out Image-in Image-out Image-in Decision-out

Thanks…