How to remove some detected edges from the edge map ?

Using the prewitt edge detector I obtained the below output.

edge(grayImage,'Prewitt')

How can I remove edges of the blue circled area from this edge map. the original image I attached herewith.

Answer 1

[Gautham Sholingar]

The following code snippet will allow you to automatically select the region you want to remove by double-clicking the region and then remove the extra section.

img = imread('king.png'); % assuming king.png is the original image called 2.png
figure;
subplot(3,1,1)
imshow(img)
t = title('Double-Click on the region you want to remove!',...
    'fontsize',12,'color','r');
h = impoint;
pos = round(h.getPosition);
rgbIndices = rgb2ind(img,5);   
SE  = strel('Disk',1,4);
for ii = 0:4
    thisMask = ismember(rgbIndices,ii);
    thisMask = imfill(thisMask,'holes');
    thisMask = imopen(thisMask, SE);
    thisMask = bwareaopen(thisMask,100);
    [y,x] = find(thisMask);
    if all(ismember(pos,[x,y]))
        maskInd = ii;
        break
    end
end
subplot(3,1,2)
imshow(thisMask)
%
subplot(3,1,3)
outline = edge(rgb2gray(img),'Prewitt');
newOutline = outline & ~imdilate(thisMask,SE);
imshow(newOutline);
end

Copy this code and run this as a script with the image open and then select the section you want to remove.

[Piyum Rangana]

Thank you so much for the answer. Actually what I tried to do was remove those areas (So called damaged or degraded) and take the output image. Then I tried to recover the damaged edges. Can I do that in this way ?