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[ÇóÖú] ÔõôÓÃMATLABÉú³ÉÒ»¸öÈýάµÄShepp-LoganÍ·¹ÇÄ£ÐͲ¢±£´æÏÂÀ´£¬Ð»Ð»ÁË

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xiegangmai(½ð±Ò+2): лл²ÎÓ룡 2011-12-14 22:27:54
Mickey__D(½ð±Ò+5): ·Ç³£¸ÐлÁË¡£ 2011-12-15 08:29:14
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p=phantom(256);
imshow(p);
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randon±ä»»£º
theta1=0:0:170,theta2=0:5:175;theta3=0:2:178;

[R1,xp]=radon(P,theta1);
[R2,xp]=radon(P,theta2);
[R3,xp]=radon(P,theta3);
figure,imagesc(theta3,xp,R3);
colormap(hot);colorbar
xlabel(' \theta ' );ylabel(' x\prime ' );

%ÀûÓò»Í¬²¿·ÖµÄrandonÄæ±ä»»À´Öع¹Í¼Ïñ
I1=iradon(R1,10);I2=iradon(R2,5);I3=iradon(R3,2);
subplot(1,3,1);
imshow(I1);title('ÓÃR1ÖØ¹¹Í¼Ïñ');
subplot(1,3,2);
imshow(I2);title('ÓÃR2ÖØ¹¹Í¼Ïñ');
subplot(1,3,3);
imshow(I3);title('ÓÃR3ÖØ¹¹Í¼Ïñ');

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2Â¥2011-12-14 20:49:58
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xiegangmai(½ð±Ò+2): лл²ÎÓ룡 2011-12-15 21:25:03
theta1=0:0:170ȷʵÓÐÎÊÌ⣬Ӧ¸Ã¸ÄΪtheta1=0:10:170.±íʾR1²ÉÓÃ18¸öͶӰ¡£Äã˵µÄ±£´æÎª.***Îļþ¸ñʽ£¬ÏÂÀ­²Ëµ¥ÀïȷʵûÓÐÕâÖÖ¸ñʽ£¬ÕâÖÖ¸ñʽµÄͼƬÎÒҲûÓÐÄÃÀ´×ö¹ýʵÑé¡£ÖÁÓÚÉú³ÉÈýάͷ¸Ç¹ÇÄ£ÐÍ£¬ºô»½ÈÈÐÄÈË....
   'Shepp-Logan'            A test image used widely by researchers in
                                tomography
       'Modified Shepp-Logan'   (default) A variant of the Shepp-Logan phantom
                                in which the contrast is improved for better  
                                visual perception.

    N is a scalar that specifies the number of rows and columns in P.
    If you omit the argument, N defaults to 256.
  
    P = PHANTOM(E,N) generates a user-defined phantom, where each row
    of the matrix E specifies an ellipse in the image.  E has six columns,
    with each column containing a different parameter for the ellipses:
   
      Column 1:  A    the additive intensity value of the ellipse
      Column 2:  a    the length of the horizontal semi-axis of the ellipse
      Column 3:  b    the length of the vertical semi-axis of the ellipse
      Column 4:  x0   the x-coordinate of the center of the ellipse
      Column 5:  y0   the y-coordinate of the center of the ellipse
      Column 6:  phi  the angle (in degrees) between the horizontal semi-axis
                      of the ellipse and the x-axis of the image        

    For purposes of generating the phantom, the domains for the x- and
    y-axes span [-1,1].  Columns 2 through 5 must be specified in terms
    of this range.

    [P,E] = PHANTOM(...) returns the matrix E used to generate the phantom.

    Class Support
    -------------
    All inputs must be of class double.  All outputs are of class double.

    Remarks
    -------
    For any given pixel in the output image, the pixel's value is equal to the
    sum of the additive intensity values of all ellipses that the pixel is a
    part of.  If a pixel is not part of any ellipse, its value is 0.  

    The additive intensity value A for an ellipse can be positive or negative;
    if it is negative, the ellipse will be darker than the surrounding pixels.
    Note that, depending on the values of A, some pixels may have values outside  the range [0,1].
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3Â¥2011-12-15 13:22:40
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xiegangmai(½ð±Ò+1): лл²ÎÓ룡 2011-12-15 21:25:13
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Mickey__D

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Mickey__D

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