仅对图像的特定部分应用霍夫变换-MATLAB [英] Apply Hough Transform to only certain section of an image - MATLAB

问题描述

我已经使用MATLAB为此处提到的一组单词创建了边界框

I have created bounding boxes for a set of words as mentioned here using MATLAB

绘制整个单词的边界框，而不是图像中的每个字符的边界框-MATLAB

现在，我想将每个边界框指定的区域的内容复制到另一个矩阵中，以进行进一步的计算.

Now, I would like to copy the contents of the region specified by each bounding box into another matrix for further computation.

给定边界框的坐标，我该怎么办?

How can I do that given the coordinates of the bounding box?

编辑

在使用@beaker提到的方法时发现了一个问题

Discovered a problem while using the method mentioned by @beaker

这是原始代码，其中binary是二进制格式的图像文件.

This is the original code where binary is the image file in binary format.

Ibox(:,cnt)给我绘制的每个矩形的坐标.

Ibox(:,cnt) gives me the coordinates of each rectangle drawn.

imshow(normal);
boxes = zeros(0,1);
Sp = 10.5;
binclosed = imclose(binary, strel('rectangle',[4 ceil(Sp/2)]));
[Ilabel,num] = bwlabel(binclosed);
Iprops = regionprops(Ilabel, 'BoundingBox');
Ibox = reshape([Iprops.BoundingBox],[4 num]);
for cnt=1:num
    rectangle('position',Ibox(:,cnt),'edgecolor','r');
    X = (Ibox(:,cnt))';
    X1 = X(1);
    Y1 = X(2);
    W = X(3);
    H = X(4);
    X2 = X1 + W;
    Y2 = Y1 - H;
    coords = [X1,Y1,X2,Y2];
    boxes = [boxes;coords];
end

现在boxes正在存储每个区域的坐标. 要提取区域，我正在做

Now boxes is storing each regions coordinates. To extract the region, I was doing

for c=1:num
    subimage = binary(boxes(c,1:2),boxes(c,3:4));
    imshow(subimage);
end

这给了我原始图像的随机剪裁.

which gave me random clippings of the original image.

当我检查boxes中的坐标值时，发现它们处于浮动状态.

When I checked the value of coordinates in boxes I found that they were in float.

如果我的图像是二进制格式，那怎么办?

How is that happening if my image is in binary format?

推荐答案

相对于K.I.S.S.解决方案.

Relatively K.I.S.S. solution.

boxes = boxes - 0.5;解决了浮点问题.

其余代码如下:

for c=1:num
    ir=1;
    for xcoord = boxes(c,1):boxes(c,2)
        ic=1;
        for ycoord = boxes(c,3):boxes(c,4)
            z(ir,ic) = binary(ycoord, xcoord);
            ic=ic+1;
        end
        ir=ir+1;
    end
    if(size(z) < 100)
        break;
    else
        str = sprintf(saveFile,c);
        imwrite(z, [folder '\cropped\' str],'jpg');
    end
    clear z;
end

在这里，我只是将裁剪后的图像保存到文件夹中，以供以后使用imwrite使用.

Here I am just saving the cropped images to a folder for later use using imwrite.

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