Shifting pixel to dewarped position

Question

Max 2014-5-27

2
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/131394-shifting-pixel-to-dewarped-position

编辑： Matt J 2014-5-28

sc2.png

Hi ,I am attaching a text image which i need to dewarp.. I have written codes till now to convert the image to binary , dilate it to find the words in it. Also i used the regionprops to find the centroid, orientation of the words. . The problem I am facing is next step is to go for interpolation to shift the pixels to dewarped position. I am unable to do that . Here are my codes

close all
clear all
clc
I=imread('sc2.png');
grid on
imagesc(I)
lev=graythresh(I);
ibw=im2bw(I,lev);
imshow(ibw);
xx=size(ibw);
for i=1:xx(1)
    for j=1:xx(2)    
        if ibw(i,j)==0
            ibw(i,j)=1;            
        else  if ibw(i,j)==1
                ibw(i,j)=0;                
            end
        end
    end
end
figure,imshow(ibw);
se = strel('line',4,0);
bw2 = imdilate(ibw,se);
bw2=bwareaopen(bw2,170);
figure,
imagesc(bw2), title('Original'); hold on 
grid on
stats=regionprops(bw2,'BoundingBox','Centroid','Extrema','Orientation');
for object =1:length(stats)
        bb = stats(object).BoundingBox;
        bc = stats(object).Centroid;
        be=stats(object).Extrema;
        bo=stats(object).Orientation
          bo;
       xmin=min(be(:,1)); 
       xmax=max(be(:,1));
       ymax=max(be(:,2));
       ymin=min(be(:,2));
       width=max(be(:,1))-min(be(:,1));
       height=max(be(:,2))-min(be(:,2));
       be=round(be);
       a1=be(4,:);
       b1=be(7,:);
       del_y=a1(2)-b1(2);
       del_x=a1(1)-b1(1);
       ang_deg=atan2(del_y,del_x)*180/pi; % to find the angle of orientation of words
        r(object)=ang_deg
       plot(bo,'-m+')
       a=text(bc(1),bc(2),strcat('Ang :',num2str(round(bo))))
       set(a, 'FontName', 'Arial', 'FontWeight', 'bold', 'FontSize', 10, 'Color', 'green');
end

Also the angle of orientation of the words are not accurate in some words as i saw in results.. The rest of the process i need just guidance. Thanking you

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Answer 1

Matt J 2014-5-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/131394-shifting-pixel-to-dewarped-position#answer_138536

I would start here,

https://www.google.com/search?q=rectify+curved+text&oq=rectify+curved+text&aqs=chrome..69i57.3620j0j1&sourceid=chrome&es_sm=93&ie=UTF-8

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Max 2014-5-28

Thanking you Matt.. I read those articles.. The thing is I want a very basic methodology like interpolation.. OR probably something like I have an angle of tilt calculated ,so just something like a masked filter to rotate them on the centroid axis and lifting the pixel up or down ..

Matt J 2014-5-28

编辑：Matt J 2014-5-28

The warping in the figure you posted looks much more complicated than a simple tilt. You can see that the text is curved, not merely rotated. It is not even a general projective transformation.

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