[英]Get frame / pattern of an image without loop MATLAB
I would like to extract certain part of an image. 我想提取图像的某些部分。 Let's say, only those parts that are indexed by ones, in some kind of template or frame.
假设只有在某种模板或框架中被索引的那些部分。
GRAYPIC = reshape(randperm(169), 13, 13);
FRAME = ones(13);
FRAME(5:9, 5:9) = 0;
FRAME_OF_GRAYPIC = []; % the new pic that only shows the frame extracted
I can achieve this using a for loop: 我可以使用for循环来实现:
for X = 1:13
for Y = 1:13
vlaue = FRAME(Y, X);
switch vlaue
case 1
FRAME_OF_GRAYPIC(X,Y) = GRAYPIC(X,Y)
case 0
FRAME_OF_GRAYPIC(X,Y) = 0
end
end
end
imshow(mat2gray(FRAME_OF_GRAYPIC));
However, is it possible to use it with some kind of vector operation, ie: 但是,可以将其与某种矢量操作一起使用,即:
FRAME_OF_GRAYPIC = GRAYPIC(FRAME==1);
Though, this doesn't work unfortunately. 不过,不幸的是,这行不通。
Any suggestions? 有什么建议么?
Thanks a lot for your answers, best, Clemens 非常感谢您的回答,最好,克莱门斯
Too long for a comment... 评论太久了...
GRAYPIC = reshape(randperm(169), 13, 13);
FRAME = zeros(13);
FRAME(5:9, 5:9) = 0;
FRAME_OF_GRAYPIC = zeros(size(GRAYPIC); % MUST preallocate new pic the right size
FRAME = logical(FRAME); % ... FRAME = (FRAME == 1)
FRAME_OF_GRAYPIC(FRAME) = GRAYPIC(FRAME);
Three things to note here: 这里要注意的三件事:
true()
/ false()
, or cast it using logical()
, or select a value to be true using FRAME = (FRAME == true_value);
true()
/ false()
创建它,或者使用logical()
FRAME = (FRAME == true_value);
它,或者使用FRAME = (FRAME == true_value);
选择一个值为true的值FRAME = (FRAME == true_value);
FRAME_OF_GRAYPIC(FRAME) = GRAYPIC(FRAME);
Output: 输出:
FRAME_OF_GRAYPIC =
38 64 107 63 27 132 148 160 88 59 102 69 81
14 108 76 58 49 55 51 19 158 52 100 153 39
79 139 12 115 147 154 96 112 82 73 159 146 93
169 2 71 25 33 149 138 150 129 117 65 97 17
43 111 37 142 0 0 0 0 0 128 84 86 22
9 137 127 45 0 0 0 0 0 68 28 46 163
42 11 31 29 0 0 0 0 0 152 3 85 36
50 110 165 18 0 0 0 0 0 144 143 44 109
114 133 1 122 0 0 0 0 0 80 167 157 145
24 116 60 130 53 77 156 35 6 78 90 30 140
74 120 40 26 106 166 121 34 98 57 56 13 48
8 155 4 16 124 75 123 23 105 66 7 141 70
89 113 99 101 54 20 94 72 83 168 61 5 10
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