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|00000020| 6e 20 4a 75 6c 20 20 33 | 20 31 32 3a 32 35 3a 34 |n Jul  3| 12:25:4|
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|00000100| 20 4a 75 6e 20 31 39 39 | 34 20 31 35 3a 31 39 3a | Jun 199|4 15:19:|
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|00000dc0| 69 6e 67 20 65 76 65 72 | 79 20 70 69 78 65 6c 0a |ing ever|y pixel.|
|00000dd0| 69 6d 31 2e 63 6c 65 61 | 72 28 29 3b 20 69 6d 31 |im1.clea|r(); im1|
|00000de0| 20 2d 3d 20 69 6d 32 3b | 20 69 6d 32 20 3d 20 69 | -= im2;| im2 = i|
|00000df0| 6d 31 3b 20 09 2f 2f 20 | 53 75 62 74 72 61 63 74 |m1; .// |Subtract|
|00000e00| 69 6e 67 20 74 77 6f 20 | 69 6d 61 67 65 73 0a 09 |ing two |images..|
|00000e10| 09 09 09 09 2f 2f 20 41 | 70 70 6c 79 69 6e 67 20 |....// A|pplying |
|00000e20| 2a 61 6e 79 2a 20 66 75 | 6e 63 74 69 6f 6e 20 74 |*any* fu|nction t|
|00000e30| 6f 20 65 76 65 72 79 0a | 69 6d 31 2e 61 62 73 28 |o every.|im1.abs(|
|00000e40| 29 3b 20 69 6d 32 2e 61 | 70 70 6c 79 28 3a 3a 61 |); im2.a|pply(::a|
|00000e50| 62 73 29 3b 20 61 73 73 | 65 72 74 28 69 6d 31 20 |bs); ass|ert(im1 |
|00000e60| 3d 3d 20 69 6d 32 29 3b | 20 2f 2f 20 70 69 78 65 |== im2);| // pixe|
|00000e70| 6c 20 28 61 62 73 28 29 | 20 69 6e 20 74 68 65 20 |l (abs()| in the |
|00000e80| 65 78 2e 29 0a 61 73 73 | 65 72 74 28 20 69 6d 31 |ex.).ass|ert( im1|
|00000e90| 20 2a 20 69 6d 31 20 3d | 3d 20 6e 6f 72 6d 5f 32 | * im1 =|= norm_2|
|00000ea0| 5f 73 71 72 28 69 6d 31 | 29 20 29 3b 09 2f 2f 20 |_sqr(im1|) );.// |
|00000eb0| 43 6f 6d 70 75 74 69 6e | 67 20 74 68 65 20 22 73 |Computin|g the "s|
|00000ec0| 63 61 6c 61 72 20 70 72 | 6f 64 75 63 74 22 0a 09 |calar pr|oduct"..|
|00000ed0| 09 09 09 09 2f 2f 20 61 | 6e 64 20 69 6d 61 67 65 |....// a|nd image|
|00000ee0| 20 6e 6f 72 6d 0a 0a 2f | 2f 20 53 71 75 61 72 65 | norm../|/ Square|
|00000ef0| 20 61 6e 64 20 72 65 63 | 74 61 6e 67 75 6c 61 72 | and rec|tangular|
|00000f00| 20 70 61 72 74 73 20 6f | 66 20 69 6d 61 67 65 0a | parts o|f image.|
|00000f10| 0a 69 6d 31 20 3d 20 32 | 2a 70 61 74 74 65 72 6e |.im1 = 2|*pattern|
|00000f20| 3b 20 69 6d 32 20 3d 20 | 70 61 74 74 65 72 6e 3b |; im2 = |pattern;|
|00000f30| 0a 72 6f 77 63 6f 6c 20 | 72 69 67 68 74 62 6f 74 |.rowcol |rightbot|
|00000f40| 74 6f 6d 28 69 6d 31 2e | 71 5f 6e 72 6f 77 73 28 |tom(im1.|q_nrows(|
|00000f50| 29 2d 31 2c 69 6d 31 2e | 71 5f 6e 63 6f 6c 73 28 |)-1,im1.|q_ncols(|
|00000f60| 29 2d 31 29 3b 0a 72 6f | 77 63 6f 6c 20 63 65 6e |)-1);.ro|wcol cen|
|00000f70| 74 65 72 28 69 6d 31 2e | 71 5f 6e 72 6f 77 73 28 |ter(im1.|q_nrows(|
|00000f80| 29 2f 32 2c 69 6d 31 2e | 71 5f 6e 63 6f 6c 73 28 |)/2,im1.|q_ncols(|
|00000f90| 29 2f 32 29 3b 0a 09 09 | 09 09 09 2f 2f 20 4d 6f |)/2);...|...// Mo|
|00000fa0| 64 69 66 79 69 6e 67 20 | 70 69 78 65 6c 73 20 6f |difying |pixels o|
|00000fb0| 6e 6c 79 20 77 69 74 68 | 69 6e 20 74 68 65 0a 09 |nly with|in the..|
|00000fc0| 09 09 09 09 2f 2f 20 6c | 6f 77 65 72 20 6c 65 66 |....// l|ower lef|
|00000fd0| 74 20 71 75 61 64 72 61 | 6e 74 0a 69 6d 31 2e 72 |t quadra|nt.im1.r|
|00000fe0| 65 63 74 61 6e 67 6c 65 | 28 63 65 6e 74 65 72 2c |ectangle|(center,|
|00000ff0| 72 69 67 68 74 62 6f 74 | 74 6f 6d 29 20 2d 3d 20 |rightbot|tom) -= |
|00001000| 32 2a 70 61 74 74 65 72 | 6e 3b 0a 61 73 73 65 72 |2*patter|n;.asser|
|00001010| 74 28 20 21 28 69 6d 31 | 20 3d 3d 20 32 2a 70 61 |t( !(im1| == 2*pa|
|00001020| 74 74 65 72 6e 29 20 26 | 26 20 21 28 69 6d 31 20 |ttern) &|& !(im1 |
|00001030| 21 3d 20 32 2a 70 61 74 | 74 65 72 6e 29 20 29 3b |!= 2*pat|tern) );|
|00001040| 0a 09 09 09 09 09 2f 2f | 20 41 6e 6f 74 68 65 72 |......//| Another|
|00001050| 20 77 61 79 20 6f 66 20 | 64 6f 69 6e 67 20 74 68 | way of |doing th|
|00001060| 69 73 0a 69 6d 31 2e 73 | 68 69 66 74 5f 63 6c 69 |is.im1.s|hift_cli|
|00001070| 70 5f 61 64 64 28 63 65 | 6e 74 65 72 2c 32 2c 69 |p_add(ce|nter,2,i|
|00001080| 6d 32 29 3b 20 20 61 73 | 73 65 72 74 28 69 6d 31 |m2);  as|sert(im1|
|00001090| 20 3d 3d 20 32 2a 70 61 | 74 74 65 72 6e 29 3b 0a | == 2*pa|ttern);.|
|000010a0| 0a 2f 2f 20 4d 69 73 63 | 65 6c 6c 61 6e 65 61 0a |.// Misc|ellanea.|
|000010b0| 09 09 09 09 09 2f 2f 20 | 4e 6f 74 65 20 22 65 78 |.....// |Note "ex|
|000010c0| 70 61 6e 64 65 64 22 20 | 66 69 6c 65 20 6e 61 6d |panded" |file nam|
|000010d0| 65 20 6f 66 20 74 68 65 | 0a 09 09 09 09 09 2f 2f |e of the|......//|
|000010e0| 20 69 6d 61 67 65 0a 49 | 4d 41 47 45 20 72 61 77 | image.I|MAGE raw|
|000010f0| 5f 69 6d 61 67 65 28 22 | 7a 63 61 74 20 2e 2e 2f |_image("|zcat ../|
|00001100| 2e 2e 2f 70 69 63 74 75 | 72 65 73 2f 6c 65 6e 6e |../pictu|res/lenn|
|00001110| 61 2e 78 77 64 2e 5a 20 | 7c 22 29 3b 0a 2f 2f 20 |a.xwd.Z ||");.// |
|00001120| 20 49 4d 41 47 45 20 69 | 6d 61 67 65 28 49 4d 41 | IMAGE i|mage(IMA|
|00001130| 47 45 3a 3a 53 68 72 69 | 6e 6b 2c 72 61 77 5f 69 |GE::Shri|nk,raw_i|
|00001140| 6d 61 67 65 29 3b 0a 49 | 4d 41 47 45 20 69 6d 61 |mage);.I|MAGE ima|
|00001150| 67 65 20 3d 20 72 61 77 | 5f 69 6d 61 67 65 2e 73 |ge = raw|_image.s|
|00001160| 71 75 61 72 65 5f 6f 66 | 28 32 35 36 2c 72 6f 77 |quare_of|(256,row|
|00001170| 63 6f 6c 28 31 32 30 2c | 31 30 30 29 29 3b 0a 69 |col(120,|100));.i|
|00001180| 6d 61 67 65 2e 77 72 69 | 74 65 28 22 2f 74 6d 70 |mage.wri|te("/tmp|
|00001190| 2f 69 6f 72 22 2c 22 4f | 72 69 67 69 6e 61 6c 20 |/ior","O|riginal |
|000011a0| 69 6d 61 67 65 22 29 3b | 0a 69 6d 61 67 65 2e 64 |image");|.image.d|
|000011b0| 69 73 70 6c 61 79 28 22 | 49 6d 61 67 65 20 74 6f |isplay("|Image to|
|000011c0| 20 64 69 73 70 6c 61 79 | 22 29 3b 0a 0a 0a 0a    | display|");.... |
+--------+-------------------------+-------------------------+--------+--------+