從自然圖像中提取文字

Question

執行此代碼時出現問題。我想從圖像中提取文本，這是我的代碼

i = imread('handicapped.jpg'); 
i1 = rgb2gray(i); 
imshow(i1); 

i2 = edge(i1,'canny',0.3); 
imshow(i2); 

se = strel('square',2); 
i3 = imdilate(i2,se); 
imshow(i3); 

i4 = imfill(i3,'holes'); 
imshow(i4); 

[Ilabel num] = bwlabel(i4); 
disp(num); 
Iprops = regionprops(Ilabel); 
Ibox = [Iprops.BoundingBox]; 
Ibox = reshape(Ibox,[4 92]); 
imshow(i); 

hold on; 
for cnt = 1:92 
rectangle('position',Ibox(:,cnt),'edgecolor','r'); 
end 

我在第19行

Error using reshape 
To RESHAPE the number of elements must not change. 

Error in test11 (line 19) 
Ibox = reshape(Ibox,[4 92]); 

任何人都可以幫我一個錯誤???

Answer 1

您假設有總是找到92個邊界框。你遇到了錯誤，因爲這顯然並非總是如此。而不是將第二個維度指定爲reshape,you can pass an empty array，以便reshape將計算出適當的維度。

%// 4 Rows with numel(Ibox)/4 columns 
Ibox = reshape(Ibox, 4, []); 

您的循環使得92相同的假設，所以你需要通過理解錯誤更改以及

for cnt = 1:size(Ibox, 2) 
    rectangle('position',Ibox(:,cnt),'edgecolor','r'); 
end