使用tesseract和opencv進行python字符串比較

Question

使用圖像調用下面的代碼會給我提供正確的結果。 但是，由於未知原因，字符串相等失敗。

def image_to_string(im, cleanup = cleanup_scratch_flag): 
    """Converts im to file, applies tesseract, and fetches resulting text. 
    If cleanup=True, delete scratch files after operation.""" 
    try: 
     util.image_to_scratch(im, scratch_image_name) 
     call_tesseract(scratch_image_name, scratch_text_name_root) 
     text = util.retrieve_text(scratch_text_name_root) 
    finally: 
     if cleanup: 
      util.perform_cleanup(scratch_image_name, scratch_text_name_root) 
    return text 


cityname=image_to_string(im) 
print cityname # this statement prints 'London' without quotes 
print cityname=='London' # This statement is always false 

Answer 1

要看到發生了什麼，嘗試做print repr(cityname)和print type(cityname)。

也試試print str(cityname) == 'London';它應該導致True。

最有可能的是cityname是不是一個字符串，但其他一些OpenCV特定的對象類型。它可能有其str()方法返回識別的字符串值;這是什麼print打印。

Answer 2

print cityname 
print repr(cityname) 
print type(cityname) 
print str(cityname) == 'LONDON' 

輸出

LONDON 
'LONDON\n\n' 
<type 'str'> 
False 

print cityname.rstrip() # is returning true