Pytesseract - 对带有不同颜色文本的图像进行 OCR
Pytesseract - OCR on image with text in different colors
当文本以不同颜色显示时,Pytesseract 无法提取文本。我尝试使用 opencv 反转图像,但它不适用于深色文本颜色。
图片:
import cv2
import pytesseract
from PIL import Image
def text(image):
image = cv2.resize(image, (0, 0), fx=7, fy=7)
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
cv2.imwrite("gray.png", gray)
blur = cv2.GaussianBlur(gray, (3, 3), 0)
cv2.imwrite("gray_blur.png", blur)
thresh = cv2.threshold(blur, 127, 255, cv2.THRESH_BINARY_INV + cv2.THRESH_OTSU)[1]
cv2.imwrite("thresh.png", thresh)
kernel = cv2.getStructuringElement(cv2.MORPH_RECT, (3, 3))
opening = cv2.morphologyEx(thresh, cv2.MORPH_OPEN, kernel, iterations=1)
cv2.imwrite("opening.png", opening)
invert = 255 - opening
cv2.imwrite("invert.png", invert)
data = pytesseract.image_to_string(invert, lang="eng", config="--psm 7")
return data
有没有办法从给定图像中提取文本:DEADLINE(红色)和 WHITE HOUSE(白色)
您可以使用 ImageOps
反转 image.And 将图像二值化。
import pytesseract
from PIL import Image,ImageOps
import numpy as np
img = Image.open("OCR.png").convert("L")
img = ImageOps.invert(img)
# img.show()
threshold = 240
table = []
pixelArray = img.load()
for y in range(img.size[1]): # binaryzate it
List = []
for x in range(img.size[0]):
if pixelArray[x,y] < threshold:
List.append(0)
else:
List.append(255)
table.append(List)
img = Image.fromarray(np.array(table)) # load the image from array.
# img.show()
print(pytesseract.image_to_string(img))
结果:
img
到底是这样的:
当文本以不同颜色显示时,Pytesseract 无法提取文本。我尝试使用 opencv 反转图像,但它不适用于深色文本颜色。
图片:
import cv2
import pytesseract
from PIL import Image
def text(image):
image = cv2.resize(image, (0, 0), fx=7, fy=7)
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
cv2.imwrite("gray.png", gray)
blur = cv2.GaussianBlur(gray, (3, 3), 0)
cv2.imwrite("gray_blur.png", blur)
thresh = cv2.threshold(blur, 127, 255, cv2.THRESH_BINARY_INV + cv2.THRESH_OTSU)[1]
cv2.imwrite("thresh.png", thresh)
kernel = cv2.getStructuringElement(cv2.MORPH_RECT, (3, 3))
opening = cv2.morphologyEx(thresh, cv2.MORPH_OPEN, kernel, iterations=1)
cv2.imwrite("opening.png", opening)
invert = 255 - opening
cv2.imwrite("invert.png", invert)
data = pytesseract.image_to_string(invert, lang="eng", config="--psm 7")
return data
有没有办法从给定图像中提取文本:DEADLINE(红色)和 WHITE HOUSE(白色)
您可以使用 ImageOps
反转 image.And 将图像二值化。
import pytesseract
from PIL import Image,ImageOps
import numpy as np
img = Image.open("OCR.png").convert("L")
img = ImageOps.invert(img)
# img.show()
threshold = 240
table = []
pixelArray = img.load()
for y in range(img.size[1]): # binaryzate it
List = []
for x in range(img.size[0]):
if pixelArray[x,y] < threshold:
List.append(0)
else:
List.append(255)
table.append(List)
img = Image.fromarray(np.array(table)) # load the image from array.
# img.show()
print(pytesseract.image_to_string(img))
结果:
img
到底是这样的: