How to write the name of Objects in the image after recognition of them.

Hello Every one! I hope you are doing well.

I have written a code to detect coins in an image, and at last I want to write a text on each of these objects (coins). But I confront error. can anyone help me please. the code I have written is here:

pic = imread('coins.png');
I = rgb2gray(pic);
imshow(I)
bw = imbinarize(I);
figure; imshow(bw)

bw = bwareaopen(bw, 500);
figure; imshow(bw)

se = strel('disk', 2);
bw = imclose(bw, se);
bw = imfill (bw, 'holes');
figure; imshow(bw);
[r, n] = bwlabel(bw);
prop = regionprops(bw,{'Area','centroid'});
%props =struct2table(props);
Dollor1=0;
Dollor2=0;
for i=1:n
    if propsarea.Area(i)<2000
        rgb = insertText(I,[prop.Centrod(i,1) prop.Centroid(i,2)],'1 Dollor',0.2, 'FontSize',12,'TextColor','black');
        Dollor1=Dollor1+1;
        
    elseif propsarea.Area(i)>2000
        rgb = insertText(I,[prop.Centroid(i,1) prop.Centrod(i,2)],'2 Dollors',0.2 ,'FontSize',12,'TextColor','black');
        Dollor2=Dollor2+1;
    end
end

figure; imshow(rgb)

Answer 1

[KALYAN ACHARJYA]

#Modified

prop = regionprops('table',bw,{'Area','centroid'});
% Modified here......^
Dollor1=0;
Dollor2=0;
for i=1:n
    if prop.Area(i)<2000
        %position=[prop.Centroid(i,1),prop.Centroid(i,2)];
        position=[1 5;7 6;9 10];%sample example
        rgb = insertText(I,position,'Dollor', 'FontSize',12,'TextColor','black');
        Dollor1=Dollor1+1;
        
    elseif prop.Area(i)>2000
        %position=[prop.Centroid(i,1),prop.Centroid(i,2)];
        position=[1 5;7 6;9 10]; %sample Example
        rgb = insertText(I,position,'Dollors','FontSize',12,'TextColor','black');
        Dollor2=Dollor2+1;
    else
    end
end
figure; imshow(rgb)

Please note that I have test the code with position sample example, here you have to define the 3 coordinates for the text box. Following result reflects only two numbers, ??

>> [prop.Centroid(i,1),prop.Centroid(i,2)]
ans =
  265.7967  102.6094

Here

prop =
  10×2 table
    Area        Centroid    
    ____    ________________
    2651    37.152    106.72
    1854    56.145    49.862
    2680    96.201    146.09
    1810    110.06    84.928
    2753    120.36    208.67
    2510    148.56     34.44
    2594    174.82    119.97
    2544    216.93    70.792
    1893    236.07    173.37
    1864    265.8     102.61

Hope the remaining work (Postions of the text box) you can do that.

[Fafa Teligence]

Thank you so much. Your explanation was very comprehensive and reasonable.

[KALYAN ACHARJYA]

Its my pleasure :)

[Fafa Teligence]

https://uk.mathworks.com/matlabcentral/answers/690970-how-to-extract-lbp-lpq-ltp-features-from-an-image-in-matlab

I would appreciate it if you could help me with this problem in the link.