[英]Python - Pytesseract extracts incorrect text from image
我在Python中使用以下代碼從圖像中提取文本,
import cv2
import numpy as np
import pytesseract
from PIL import Image
# Path of working folder on Disk
src_path = "<dir path>"
def get_string(img_path):
# Read image with opencv
img = cv2.imread(img_path)
# Convert to gray
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
# Apply dilation and erosion to remove some noise
kernel = np.ones((1, 1), np.uint8)
img = cv2.dilate(img, kernel, iterations=1)
img = cv2.erode(img, kernel, iterations=1)
# Write image after removed noise
cv2.imwrite(src_path + "removed_noise.png", img)
# Apply threshold to get image with only black and white
#img = cv2.adaptiveThreshold(img, 255, cv2.ADAPTIVE_THRESH_GAUSSIAN_C, cv2.THRESH_BINARY, 31, 2)
# Write the image after apply opencv to do some ...
cv2.imwrite(src_path + "thres.png", img)
# Recognize text with tesseract for python
result = pytesseract.image_to_string(Image.open(img_path))#src_path+ "thres.png"))
# Remove template file
#os.remove(temp)
return result
print '--- Start recognize text from image ---'
print get_string(src_path + "test.jpg")
print "------ Done -------"
但是輸出不正確。輸入文件是
收到的輸出是“ 0001”而不是“ D001”
收到的輸出是“ 3001”而不是“ B001”
需要什么代碼更改才能從圖像中檢索正確的字符,還訓練pytesseract返回圖像中所有字體類型的正確字符[包括粗體字符]
@Maaaaa指出了Tessearact無法正確識別文本的確切原因。
但是,仍然可以通過在tesseract輸出上應用一些后處理步驟來提高最終輸出。 如果有幫助,您可以考慮並使用以下幾點:
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