How can I get back the original image of the segmented area after using active contour? the background is still black but the segmented area fills with the original colour image.

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matlab noob 2017-11-1

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https://ww2.mathworks.cn/matlabcentral/answers/364470-how-can-i-get-back-the-original-image-of-the-segmented-area-after-using-active-contour-the-backgrou

clc clear all; close all; I = imread('B1_51.tif'); I=rgb2gray(I); imshow(I)

    str = 'Click to select initial contour location. Double-click to confirm and proceed.';
    title(str,'Color','b','FontSize',12);
    disp(sprintf('\nNote: Click close to object boundaries for more accurate result.'));
    mask = roipoly;
    figure, imshow(mask)
    title('Initial MASK');
    maxIterations = 200; 
    bw = activecontour(I, mask, maxIterations, 'Chan-Vese');
    figure, imshow(bw)
    title('Segmented Image')
please give me some idea and comment about this!  thank you.