Why my OCR isn't working on a very easy image

I have a binary image with 7 characters on.

It could not be easier for the ocr() function to detect, yet it still returns nothing.

An help would be appreciated

x = %My binary image

v = ocr(X).

But when I call v. It returns an empty vector for text?

Any advice/help would be greatly appreciated

Answer 1

[yanqi liu]

sir，may be need some process，make it to white background and black text

clc;clear all;close all;
X = imread('https://ww2.mathworks.cn/matlabcentral/answers/uploaded_files/804884/skew.jpg');
bw = im2bw(X);
bw = imclearborder(bw);
bw = ~bw;
v = ocr(bw)

v = 
  ocrText with properties:

                      Text: 'HK5| FHD↵↵'
    CharacterBoundingBoxes: [10×4 double]
      CharacterConfidences: [10×1 single]
                     Words: {2×1 cell}
         WordBoundingBoxes: [2×4 double]
           WordConfidences: [2×1 single]

Iocr = insertObjectAnnotation(X, 'rectangle', ...
    v.WordBoundingBoxes, ...
    v.Words);
figure; imshow(Iocr);