如何阅读写在这个灯泡上的文字

Question

我有一个像这样的灯泡图像：

我想提取上面写的数字：

然后传给ocr.

如何使用 OpenCV 执行此操作？

我写过这样的代码，但它对ocr不好。

def img_process(frame):
    original_frame = frame.copy()
    rected = frame.copy()
    add_rect(rected)

    croped = crop(frame)
    frame_grey = cv2.cvtColor(croped, cv2.COLOR_BGR2GRAY)

    thr = cv2.adaptiveThreshold(frame_grey.copy(), 255, cv2.ADAPTIVE_THRESH_MEAN_C, cv2.THRESH_BINARY_INV, 13, 8)
    final = remove_lines(thr)
    final = cv2.morphologyEx(final, cv2.MORPH_CLOSE, np.ones((2, 2)))
    cnts, hiercachy = cv2.findContours(final, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

    sorted_contours= sorted(cnts, key=cv2.contourArea, reverse= True)
    if len(sorted_contours) > 0:
        largest_item= sorted_contours[0]
        x, y, w, h = cv2.boundingRect(largest_item)
        cv2.rectangle(final, (x, y), (x+w, y+h), (255, 0,0), 2)

    return rected, final


def remove_lines(img_thr):
    # Remove horizontal
    horizontal_kernel = cv2.getStructuringElement(cv2.MORPH_RECT, (10, 3))
    detected_lines = cv2.morphologyEx(img_thr, cv2.MORPH_OPEN, horizontal_kernel, iterations=2)
    cnts = cv2.findContours(detected_lines, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
    cnts = cnts[0] if len(cnts) == 2 else cnts[1]
    for c in cnts:


        cv2.drawContours(img_thr, \[c\], -1, (0, 0, 0), -1)

    # Remove vertical
    horizontal_kernel = cv2.getStructuringElement(cv2.MORPH_RECT, (3, 10))
    detected_lines = cv2.morphologyEx(img_thr, cv2.MORPH_OPEN, horizontal_kernel, iterations=2)
    cnts = cv2.findContours(detected_lines, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
    cnts = cnts\[0\] if len(cnts) == 2 else cnts\[1\]
    for c in cnts:
        cv2.drawContours(img_thr, \[c\], -1, (0, 0, 0), -1)

    return img_thr

带有矩形的原始图像，用于在代码上定位相机：

裁剪和处理的图像：