1. 醫 學 影 像 處 理 Motivation Who I am? What I am doing? What is image?
Human Visual System
Visual Phenomenon
蔣依吾
資訊工程學系
國立中山大學
www: image.cse.nsysu.edu.tw

2. Motivation 望聞問切 -> 中醫科學化
1964: JPL (Jet Propulsion Lab) process pictures of the moon transmitted by Ranger 7 to correct various types of image distortion by a computer.
Medicine contrast enhancement: x-ray, ultrasound, CT, MRI, SPECT: single photon emission computed tomography, PET: positron emission tomography

3. 少年十五二十時
步行奪得胡馬騎
射殺山中白額虎
肯數鄴下黃鬚兒
一身轉戰三千里
一劍曾當百萬師
路旁時賣故侯瓜
門前學種先生柳
蒼茫古木連窮巷
寥落寒山對虛牖

4. Who I am 電磁波 光學 半導體 控制 電力 通訊 信號處理 … 醫學工程 數位信號處理 電子電路 電腦網路 資訊
語言 1-D DSP
Image Processing
2-D DSP
Machine Vision
Image Seg. 3-D DSP

5. What I am doing * motion estimation : picture phone , VOD
image compression : MPEG , WWW
* image reconstruction : X-ray , CT ,
* image enhancement : remote sensing, military reconnaissance
* machine vision : robot maneuvering
vectorization target identification
* content-based image database retrieval

6. An image is a 2D rectilinear array of pixels.
What is an image?
Run Length： 5*255 2*101 1*100 2*168 1*47 1*49 :
 An image is a 2D rectilinear array of pixels.

7. Resolution

8. A 512*512 image displayed in 256,128,64,32 ,16,8,4 and 2 levels respectively.

10. Human Visual System

12. l       The cones are primarily used for daylight vision, are sensitive to color, are concentrated in the central region of the eye, and have a high resolution capability. Very few cones away from the central visual axis.
l       The rods are used in night vision, see only brightness, are distributed across the retina, and have medium to low level resolution.

13. Blind Spot

19. Hubble

20. Elements of digital image processing systems

21. Stereo Image

23. Visual Phenomena

30. Ambiguities

31. Ambiguities

32. Visual inconsistencies

34. Visual inconsistencies

38. Chromatic adaption

39. Ouchi Apparent Motion Illusion

40. Near and Far Sighted

41. Near and Far Sighted

45. Enhancement by image subtraction: (a) mask image; (b) image (after injection of dye into the bloodstream) with mask subtracted out.

47. mask of size 25x25