How can i create a table that will contains the pixel values that i get from impixel()?

Question

Stephani Kanga 2020-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/654478-how-can-i-create-a-table-that-will-contains-the-pixel-values-that-i-get-from-impixel

评论： Jemima Pulipati 2020-11-25

I want to display the values from impixel to a uitable but, as the user is going to choose the points, the values are not constant so i can't initialize the table's data. How can i read the values from impixel and then put it in the table(RGB) along with two other columns (Name, Color)?

P = impixel() ;
Table = uitable(Tab1,'Units','normalized','Position',[.0 .1 1 .6]);
Table.ColumnName = {'Name','RGB','Color'};
Table.ColumnEditable = [true false false]; 
Table.RowName = 'numbered';
 [numSelections,numCols] = size(P);
for i = 1 :numSelections-1
           cell(i).name ='Label '+i; 
            cell(i).rgb = P(i,1);
           cell(i).color = 'Color'+ i ;
end
Table.Data = cell2table(cell);

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Answer 1

Jemima Pulipati 2020-11-23

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https://ww2.mathworks.cn/matlabcentral/answers/654478-how-can-i-create-a-table-that-will-contains-the-pixel-values-that-i-get-from-impixel#answer_552978

编辑：Jemima Pulipati 2020-11-23

在 MATLAB Online 中打开

Hello,

The impixel() accepts the image as an argument and returns the values of the pixels selected interactively on the image.

image = imread('peppers.png');
P = impixel(image) ;

The points on the image can be selected using normal button clicks but the last point has to be selected using 'Shift - click'.

Here is the modified code using the impixel() and storing the data in a uitable.

image = imread('peppers.png');
P = impixel(image) ;
% Specifying a parent container for uitable
f = uifigure;
Table = uitable(f,'Units','normalized','Position',[.0 .1 1 .6]);
Table.ColumnName = {'Name','RGB','Color'};
Table.ColumnEditable = [true false false]; 
Table.RowName = 'numbered';
[numSelections,numCols] = size(P);
% Pre allocating the array for speed
cellArray = cell(numSelections-1,3);
for i = 1 :numSelections-1
  % storing the values in a cell array  
  cellArray(i,:) = {"Label"+num2str(i), P(i,1), "Color"+ num2str(i)};
end
Table.Data = cell2table(cellArray);

The output of this code is

NOTE: The number of values displayed in the table depend on the number of iterations, the loop runs. Since, you are running the loop till 'numSelections - 1' the last point selected on the image will not be displayed in the table. To get all the values selected interactively, you may use

for i = 1 :numSelections

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Stephani Kanga 2020-11-24

Hello, thanks for your answer but it doesn't work because I use figure instead of uifigure. Is there a way to have a uitable in a figure?

Jemima Pulipati 2020-11-25

在 MATLAB Online 中打开

Hello,

A uitable can accept a 'figure' as a parent container.

Here is the modified code using a 'figure'

image = imread('peppers.png');
P = impixel(image) ;
% Specifying a parent container for uitable
f = figure;
Table = uitable(f,'Units','normalized','Position',[.0 .1 1 .6]);
Table.ColumnName = {'Name','RGB','Color'};
Table.ColumnEditable = [true false false]; 
Table.RowName = 'numbered';
[numSelections,numCols] = size(P);
% Pre allocating the array for speed
cellArray = cell(numSelections-1,3);
for i = 1 :numSelections-1
  % storing the values in a cell array 
  % converting the string to a char while storing in a cell array
  cellArray(i,:) = {char("Label "+num2str(i)), P(i,1), char("Color "+num2str(i))};
end
Table.Data = cellArray;