使用OpenCV获取文本方向

Question

我想使用OpenCV或任何图像预处理库获取文本方向（即角度）。

图像没有文字倾斜，但是图像本身是倾斜的

例如：

我找到了一个检测文本倾斜的代码，我想对其进行修改以解决我的情况

# load the image from disk
image = cv2.imread(args["image"])

# convert the image to grayscale and flip the foreground
# and background to ensure foreground is now "white" and
# the background is "black"
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
gray = cv2.bitwise_not(gray)

# threshold the image, setting all foreground pixels to
# 255 and all background pixels to 0
thresh = cv2.threshold(gray, 0, 255,
    cv2.THRESH_BINARY | cv2.THRESH_OTSU)[1]

# grab the (x, y) coordinates of all pixel values that
# are greater than zero, then use these coordinates to
# compute a rotated bounding box that contains all
# coordinates
coords = np.column_stack(np.where(thresh > 0))
angle = cv2.minAreaRect(coords)[-1]

# the `cv2.minAreaRect` function returns values in the
# range [-90, 0); as the rectangle rotates clockwise the
# returned angle trends to 0 -- in this special case we
# need to add 90 degrees to the angle
if angle < -45:
    angle = -(90 + angle)

# otherwise, just take the inverse of the angle to make
# it positive
else:
    angle = -angle