Index in position 2 exceeds array bounds (must not exceed 1) ??

Question

Ramesh Bala 2018-7-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/408504-index-in-position-2-exceeds-array-bounds-must-not-exceed-1

评论： Image Analyst 2024-1-16

Why does the following function produce the error "Index in position 2 exceeds array bounds (must not exceed 1)"?

function test2
close all
prompt ={'Enter the x1 value: ','Enter the y1 value: ','Enter the x2 value: ','Enter the y2 value: '};
Is = inputdlg(prompt); 
Is = str2double(Is);
%Eucleidan distance
D = sqrt((Is(1,2)-Is(1,1))^2 + (Is(1,4)-Is(1,3))^2);
fprintf ('the distance value obtained is %d',D)
end

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Hedaeatul Islam Sumon 2021-12-26

在 MATLAB Online 中打开

Can anyone help me , solve this problem?

error:

Index in position 2 exceeds array bounds. Index must not exceed 44.

Error in teamplate_matching (line 46)

x1= x1+(tem_complement(i,j)-tem_mean)*(fea_complement(a,b)-fea_mean);

Here is my code:

clc;
close all;
template = imread('AAAAA.JPG');
tem2gray = rgb2gray(template);
feature = imread('L.JPG');
fea2gray = rgb2gray(feature);
tem_thres = graythresh(tem2gray);
tem2bin = imbinarize(tem2gray,tem_thres);
fea_thresh = graythresh(fea2gray);
fea2bin = imbinarize(fea2gray,fea_thresh);
tem_complement = imcomplement(tem2bin);
fea_complement = imcomplement(fea2bin);
[height,weight] = size(tem_complement);
[height2,weight2] = size(fea_complement);
sum = 0;
for i = 1:height2
    for j = 1: weight2
        sum = sum + fea_complement(i,j);
    end
end
fea_mean = sum/(height2*weight2);
ncc_value = zeros(1,26);
current = 1;
for x = 1:26
    sum = 0;
    for i = 1:height
        for j =current:current+59
            sum = sum+tem_complement(i,j);
        end
    end
    
    tem_mean = sum/(height2*weight2);
    
    x1 = 0;
    x2 = 0;
    x3 = 0;
    
    a = 1;
    for i =1:height
        b= 1;
        for j = current:current+59
            x1= x1+(tem_complement(i,j)-tem_mean)*(fea_complement(a,b)-fea_mean);
            x2 = x2 + tem_complement(i,j)^2;
            x3 = x3 + fea_complement(a,b)^2;
            b=b+1;
        end
        a= a+1;
    end
    
    c= x1/sqrt(x2*x3);
    ncc_value(x) = c;
    current = current+60;
end
fprintf("Value of NCC\n");
for i=1:26
    fprintf('%.2f\n',ncc_value(i));
end
[value,index] = max(ncc_value);
fprintf('\n Matched With %d\n', index);
subplot(3,1,1);
imshow(tem_complement);
title('Template Image');
subplot(3,1,2);
imshow( fea_complement);
title('Cndidate Image');
subplot(3,1,3);
imshow(tem_complement);
title('Best Match shown by red rectangle box');
rectangle('Position',[(index-1)*weight2 5 weight2 height2], 'Edgecolor','r'); 

Walter Roberson 2022-1-8

在 MATLAB Online 中打开

filename1 = 'AAAAA.JPG';
filename2 = 'L.JPG';
if isunix();
    filename1 = 'flamingos.jpg';
    filename2 = 'kobi.png';
end
template = imread(filename1);
tem2gray = rgb2gray(template);
feature = imread(filename2);
fea2gray = rgb2gray(feature);
tem_thres = graythresh(tem2gray);
tem2bin = imbinarize(tem2gray,tem_thres);
fea_thresh = graythresh(fea2gray);
fea2bin = imbinarize(fea2gray,fea_thresh);
tem_complement = imcomplement(tem2bin);
fea_complement = imcomplement(fea2bin);
[height,weight] = size(tem_complement);
[height2,weight2] = size(fea_complement);
sum = 0;
for i = 1:height2
    for j = 1: weight2
        sum = sum + fea_complement(i,j);
    end
end
fea_mean = sum/(height2*weight2);
ncc_value = zeros(1,26);
current = 1;
for x = 1:26
    sum = 0;
    for i = 1:height
        for j =current:current+59
            if j > size(tem_complement,2)
               i,j,current,whos
            end
            sum = sum+tem_complement(i,j);
        end
    end
    
    tem_mean = sum/(height2*weight2);
    
    x1 = 0;
    x2 = 0;
    x3 = 0;
    
    a = 1;
    for i =1:height
        b= 1;
        for j = current:current+59
            if j > size(tem_complement,2) || b > size(fea_complement,2)
               i, j, a, b, whos
            end
            x1= x1+(tem_complement(i,j)-tem_mean)*(fea_complement(a,b)-fea_mean);
            x2 = x2 + tem_complement(i,j)^2;
            x3 = x3 + fea_complement(a,b)^2;
            b=b+1;
        end
        a= a+1;
    end
    
    c= x1/sqrt(x2*x3);
    ncc_value(x) = c;
    current = current+60;
end
i = 1
j = 1297
current = 1261
  Name                   Size                  Bytes  Class      Attributes

  a                      1x1                       8  double               
  b                      1x1                       8  double               
  c                      1x1                       8  double               
  current                1x1                       8  double               
  fea2bin             1224x1632              1997568  logical              
  fea2gray            1224x1632              1997568  uint8                
  fea_complement      1224x1632              1997568  logical              
  fea_mean               1x1                       8  double               
  fea_thresh             1x1                       8  double               
  feature             1224x1632x3            5992704  uint8                
  filename1              1x13                     26  char                 
  filename2              1x8                      16  char                 
  height                 1x1                       8  double               
  height2                1x1                       8  double               
  i                      1x1                       8  double               
  j                      1x1                       8  double               
  ncc_value              1x26                    208  double               
  sum                    1x1                       8  double               
  tem2bin              972x1296              1259712  logical              
  tem2gray             972x1296              1259712  uint8                
  tem_complement       972x1296              1259712  logical              
  tem_mean               1x1                       8  double               
  tem_thres              1x1                       8  double               
  template             972x1296x3            3779136  uint8                
  weight                 1x1                       8  double               
  weight2                1x1                       8  double               
  x                      1x1                       8  double               
  x1                     1x1                       8  double               
  x2                     1x1                       8  double               
  x3                     1x1                       8  double               
Index in position 2 exceeds array bounds. Index must not exceed 1296.

So you start current at 1 in the outer loop, and you add 60 to it each iteration. You have 29 iterations so you are assuming that your data can be indexed to at least 1+60*28 = 1681 based upon current.

Inside your x loop you loop j =current:current+59 so you assume that you can index up to 1+60*28+59 = 60*29 = 1740 .

But suppose that is not the case: suppose the image you read in is smaller than that. Why are you hard-coding 29 loops of x? Why are you not determining the upper limit according to the size of the image?

Remember, by the way, to take into account that your image might not be an exact multiple of 60 wide.

I distinctly remember posting some other hints for you about how to calculate your values more efficiently, but I cannot find those at the moment.

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Answer 1

Guillaume 2018-7-3

8
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/408504-index-in-position-2-exceeds-array-bounds-must-not-exceed-1#answer_327245

编辑：MathWorks Support Team 2020-2-27

The error occurs because the vector “Is” is a 4-by-1 column vector (not a 1-by-4 row vector) so that the valid element positions are (1,1), (2,1), (3,1), and (4,1). If you try to access any index value beyond 1 in the 2nd position, you will encounter the error.