如何使用pytesseract检测气泡字母数字

Question

我正在使用pytesseract和opencv能够相当实时地检测游戏中的数字。但是，这是非常不一致的。

我已经更改了许多设置，并对图像进行了很多改进，但是即使图像与以前一样，90％的时间仍然无法正常工作。

这是我要使用的图像示例： 这是我的代码：

from PIL import ImageGrab, Image
import cv2
import time
import argparse
import os
import pytesseract
from ctypes import windll
user32 = windll.user32
user32.SetProcessDPIAware()
pytesseract.pytesseract.tesseract_cmd = r"C:\Program Files\Tesseract-OCR\tesseract.exe"
def process_img(screen):
    global filename
    ap = argparse.ArgumentParser()
    ap.add_argument("-p", "--preprocess", type=str, default="thresh",
                    help="type of preprocessing to be done")
    args = vars(ap.parse_args())
    b = screen.copy()

    resizedimg = cv2.resize(b, (750,500))
    ret, thresh = cv2.threshold(resizedimg, 127, 255, cv2.THRESH_BINARY)
    kernel = np.ones((3, 3), np.uint8)
    img = cv2.erode(thresh, kernel, iterations=1)

    img_gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    if args["preprocess"] == "thresh":
        img_gray = cv2.threshold(img_gray, 0, 255,
                             cv2.THRESH_BINARY | cv2.THRESH_OTSU)[1]
    elif args["preprocess"] == "blur":
        img_gray = cv2.medianBlur(img_gray, 3)
    blurred = cv2.GaussianBlur(img_gray, (5, 5), 0)
    edged = cv2.Canny(blurred, 50, 200, 255)
    filename = "{}.png".format(os.getpid())
    cv2.imwrite(filename, edged)
    return edged
prevtext = int(100)
while True:
    screen = np.array(ImageGrab.grab(bbox=(790, 1315, 839, 1345)))
    # print('Frame took {} seconds'.format(time.time()-last_time))
    last_time = time.time()
    new_screen = process_img(screen)
    cv2.imshow('window', new_screen)
    if cv2.waitKey(25) & 0xFF == ord('q'):
        cv2.destroyAllWindows()
        break
    time.sleep(.5)
    text = pytesseract.image_to_string(Image.open(filename), lang='eng',
                                       config='--psm 13 --oem 3 -c tessedit_char_whitelist=0123456789')
    os.remove(filename)
    print(text)
    try:
        int(text)
    except:
        text = prevtext

    print("health is " + str(text))
    print("previous health was " + str(prevtext))
    if int(prevtext) > int(text):
        print("Got hit")
    prevtext = text

是否有办法使它变得更好（成功率至少75％）？