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2007Theo Schouten1 Fundamentals acquisition processing to an image models blob coloring algoritm.

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Presentation on theme: "2007Theo Schouten1 Fundamentals acquisition processing to an image models blob coloring algoritm."— Presentation transcript:

1 2007Theo Schouten1 Fundamentals acquisition processing to an image models blob coloring algoritm

2 2007Theo Schouten2 Acquisition and processing

3 2007Theo Schouten3 CCD chips

4 2007Theo Schouten4 CT scan

5 2007Theo Schouten5 MRI scan strong magnetic field 1,5 Tesla, alignment of spin of bounded protons, 13 C and 31 P electromagnetic pulse, disruption spin-lattice or T1, and spin-spin or T2 relaxation: EM radiation 3D image after large number of measurements

6 2007Theo Schouten6 Ultrasound doppler effect:speed of blood much technical improvements also 3D images

7 2007Theo Schouten7 Structured light

8 2007Theo Schouten8 Spot ranger

9 2007Theo Schouten9 CCD focus passive method: lens is moved until (the center of) the acquired image is as sharp as possible. The average difference between the pixels and their neighboring pixels is used to determine the how sharp the image is. The active method uses an infrared bundle. The amount of received reflected light is proportional to the distance to the object. With the aid of a motor, the lens is the placed in the appropriate position.

10 2007Theo Schouten10 Image functions f(x) = f(x,y) the light intensity or energy on position x f(x) = i(x).r(x) f(x) = { f red (x), f green (x), f blue (x)} digitizing models aspect ratio’s: 1, 4/3 16/9 quantization models: number of bits for light per pixel per color 1: binary image 8: gray or color images trend to higher numbers: 10, 12, 16

11 2007Theo Schouten11 Geometric models |u| |a11 a12 a23 a14| |X| and x = u/w, y=v/w |v| = |a21 a22 a23 a24| |Y| |w| |a31 a22 a33 a34| |Z| |a41 a42 a43 a44| |1|

12 2007Theo Schouten12 Stereo model

13 2007Theo Schouten13 Radiometric models Energy flux  watts Radiant intensity I= d  /d  watts/steradian Solid angle (ruimte hoek) d  =dA/r 2 = dAcos  /r 2 Irradiance (instraling) E=d  /dA watts/m 2 Radiance (uitstraling) L=d 2  /dAcos  d  Flux  op lens van gebiedje  A 0 :  L dA o d  = L  A o cos   met  =  /4 D 2 cos  / (f o / cos  ) 2 Instraling op  A p : E=  /  A p =L  A 0 cos   /  A p Centrum van lens ziet  A p en  A o onder dezelfde ruimte hoek:  A o cos  /(f o / cos  ) 2 =  A p cos  / (f p / cos  ) 2 Alles in E invullen: E=  /4 (D/f p ) 2 L cos 4 

14 2007Theo Schouten14 Eye color model

15 2007Theo Schouten15 RGB model CMY (K)

16 2007Theo Schouten16 Other color models

17 2007Theo Schouten17 Relations, blob coloring f(x u )f(x l )do: 10color(x c ) := color(x u ) 01color(x c ) := color(x l ) 00color(x c ) := k ; k := k+1 11 color(x c ) := color(x u ) or color(x l ) and store in a list: color(x u ) == color(x l )

18 2007Theo Schouten18 Convolution operation window (3 x 3) mask or filter (values of w’s) convolution: parallel operation serial operation for many methods both parallel and serial versions are known


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