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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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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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ÎÒÆæ¹ÖµÄÊÇÄãÕâ¸öÎÊÌâΪʲôûÓÐÈ˻ش𣿲¢²»ÄÑ£¬°¥¡£Ï£Íû´ó¼Ò¶¼ÈÈÐÄÀ´ÌÖÂÛ°¡~~~ºÇºÇ~~~ shepp-logan´óÄÔͼÊÇÓÉͼÏñ´¦Àí¹¤¾ßÏ亯Êýphantom´´½¨µÄ¡£ Ê×ÏȲúÉúÒ»¸ö256»Ò¶È¼¶µÄ´óÄÔͼ£º p=phantom(256); imshow(p); ÁíÍâͶӰºÍÖØ½¨µÄ³ÌÐòÎÒÒ²ÌæÄã±àÁ˰ɣ¡ 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'); ÒÔÉϳÌÐò±¾ÈËÇ××ÔÓÃmatlabΪÄãÑéÖ¤¹ý£¬Ö±½ÓµÃͼÏñ¡£ È绹Óв»¶®µÄÎÊÌ⣬¿É½»Á÷¡£ |
2Â¥2011-12-14 20:49:58
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xiegangmai(½ð±Ò+2): лл²ÎÓ룡 2011-12-15 21:25:03
xiegangmai(½ð±Ò+2): лл²ÎÓ룡 2011-12-15 21:25:03
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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]. ĿǰÎÒËùÖªµÀÒ²¾ÍÕâô¶à£¬Ò²ÔÚѧ£¬Ñ§µÃÔ½¶à²ÅÖªµÀ×Ô¼º»áµÄÔ½ÉÙ....ÇëÎÊÄãÊÇҽѧͼÏñ´¦ÀíµÄÂ𣿠|
3Â¥2011-12-15 13:22:40
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xiegangmai(½ð±Ò+1): лл²ÎÓ룡 2011-12-15 21:25:13
xiegangmai(½ð±Ò+1): лл²ÎÓ룡 2011-12-15 21:25:13
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4Â¥2011-12-15 20:40:15
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5Â¥2011-12-16 08:09:35
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6Â¥2011-12-16 08:09:56














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