wat is function of scale and size?
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if size(i,3)>1
i=rgb2gray(i);
wat is size(i,3),here i is image and 3 is what
scale=2; if scale>0 here scale gives what
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Pawel Jastrzebski
2018-3-14
编辑:Pawel Jastrzebski
2018-3-14
size (x,3) calculates the depth of a 3D array.
Function size calculate the dimensions of the array. The additional parameter (1,2,3) tells which size specifically should be calculated.
% dimensions
x = 5
y = 6
z = 7
% 2D matrix of random values
m2D = rand(x,y)
% 3D matrix of random values
m3D = rand(x,y,z)
% using 'size' on a 2D matrix:
s2D = size(m2D) % gives 'x' and 'y' dimensions
s2Dx = size(m2D,1) % gives 'x' dimension only
s2Dy = size(m2D,2) % gives 'y' dimension only
s2Dz = size(m2D,3) % gives 1, as there's no depth
% using 'size' on a 3D matrix:
s3D = size(m3D) % gives 'x', 'y' and 'z' dimensions
s3Dx = size(m3D,1) % gives 'x' dimension only
s3Dy = size(m3D,2) % gives 'y' dimension only
s3Dz = size(m3D,3) % gives 'z' dimension only
2 个评论
Pawel Jastrzebski
2018-3-14
编辑:Pawel Jastrzebski
2018-3-14
I don't want to be rude, but can't you run the code yourself to find out the output?
The output is explained in the comments.
>> % dimensions
x = 5
y = 6
z = 7
% 2D matrix of random values
m2D = rand(x,y)
% 3D matrix of random values
m3D = rand(x,y,z)
% using 'size' on a 2D matrix:
s2D = size(m2D) % gives 'x' and 'y' dimensions
s2Dx = size(m2D,1) % gives 'x' dimension only
s2Dy = size(m2D,2) % gives 'y' dimension only
s2Dz = size(m2D,3) % gives 1, as there's no depth
% using 'size' on a 3D matrix:
s3D = size(m3D) % gives 'x', 'y' and 'z' dimensions
s3Dx = size(m3D,1) % gives 'x' dimension only
s3Dy = size(m3D,2) % gives 'y' dimension only
s3Dz = size(m3D,3) % gives 'z' dimension only
x =
5
y =
6
z =
7
m2D =
0.1599 0.9759 0.8343 0.9044 0.5714 0.3581
0.6668 0.0309 0.8136 0.6804 0.9817 0.9869
0.0179 0.4939 0.6290 0.3788 0.8497 0.0840
0.1197 0.8627 0.0022 0.6320 0.2834 0.2503
0.9521 0.2429 0.3797 0.2433 0.6825 0.8113
m3D(:,:,1) =
0.0844 0.4379 0.9053 0.7831 0.2488 0.9258
0.5313 0.3504 0.6402 0.6857 0.3193 0.1788
0.8006 0.4785 0.1629 0.4662 0.9108 0.5175
0.7388 0.5874 0.5659 0.2603 0.8852 0.6270
0.1417 0.1458 0.9316 0.5693 0.7946 0.9132
m3D(:,:,2) =
0.6640 0.0850 0.3801 0.3781 0.6853 0.2602
0.3892 0.9224 0.8128 0.2489 0.6203 0.8775
0.7400 0.0536 0.2441 0.2529 0.7467 0.8061
0.8176 0.5270 0.8844 0.7672 0.9773 0.4611
0.6003 0.1189 0.7126 0.0499 0.3839 0.0910
m3D(:,:,3) =
0.5643 0.7267 0.0525 0.9084 0.8506 0.5173
0.1874 0.5158 0.8012 0.5100 0.1445 0.9905
0.5317 0.7906 0.6786 0.6149 0.3705 0.2265
0.3550 0.2045 0.9460 0.3161 0.6224 0.3980
0.3148 0.6781 0.0916 0.0775 0.9976 0.6966
m3D(:,:,4) =
0.0646 0.3191 0.7346 0.4968 0.4658 0.2886
0.7477 0.9861 0.6373 0.0224 0.5609 0.2690
0.4204 0.7182 0.0738 0.0538 0.4945 0.5942
0.8113 0.4132 0.1205 0.1409 0.0678 0.4759
0.3796 0.0986 0.9816 0.8935 0.8976 0.3683
m3D(:,:,5) =
0.6556 0.4391 0.5199 0.5669 0.0478 0.9374
0.9382 0.0273 0.0538 0.6804 0.7383 0.5134
0.6204 0.8762 0.8622 0.3714 0.0380 0.2409
0.2828 0.6101 0.4429 0.0782 0.9542 0.2600
0.2052 0.2036 0.5480 0.4564 0.7424 0.7590
m3D(:,:,6) =
0.9933 0.4306 0.6401 0.3081 0.7598 0.4369
0.3567 0.7307 0.1320 0.4024 0.2909 0.3043
0.7529 0.2612 0.4528 0.8842 0.2774 0.2909
0.1100 0.0948 0.6522 0.7006 0.0061 0.2425
0.5970 0.4510 0.8270 0.2419 0.3747 0.9367
m3D(:,:,7) =
0.8602 0.2698 0.3320 0.5433 0.4825 0.1319
0.3972 0.9897 0.7487 0.2514 0.4427 0.3559
0.4794 0.1837 0.6444 0.5786 0.3118 0.3959
0.5650 0.8617 0.1692 0.9155 0.0553 0.8855
0.4896 0.0326 0.9522 0.8956 0.7538 0.0212
s2D =
5 6
s2Dx =
5
s2Dy =
6
s2Dz =
1
s3D =
5 6 7
s3Dx =
5
s3Dy =
6
s3Dz =
7
>>
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