如何在图像上随机旋转写每个字母

Question

我的代码在图像中写了一些字母，但我想要的是随机旋转地写每个字母作为附加图像

import numpy as np
import cv2
font = cv2.FONT_HERSHEY_SIMPLEX
# Create a black image
img = np.zeros((500,500,3), np.uint8)
char = "ABCDEFG"

for i in range (0,7,1):
    cv2.putText(img, char[i], (150 + i*30, 250), font, 1, (255, 255, 255), 2)

#Display the image
cv2.imshow("img",img)

cv2.waitKey(0)

see the image to see what the result that I want

Answer 1

这不是完美的解决方案，但可以按照以下方式实现。

import numpy as np
import random
import cv2

font = cv2.FONT_HERSHEY_SIMPLEX
# Create a black image
img = np.zeros((500,500,3), np.uint8)
char = "ABCDEFG"

for i in range (0,7,1):
    text_location = (150 + i*30, 250)   # Location of the letter
    angle = random.randint(0,90)        # angle of rotation

    # Rotate the image to put the letter at an angle
    M = cv2.getRotationMatrix2D(text_location, angle, 1)
    img = cv2.warpAffine(img, M, (img.shape[1], img.shape[0]))

    # Put the letter.
    cv2.putText(img, char[i], text_location, font, 1, (255, 255, 255), 2)

    # Undo the initial rotation of image for the next letter.
    M = cv2.getRotationMatrix2D(text_location, -1*angle, 1)
    img = cv2.warpAffine(img, M, (img.shape[1], img.shape[0]))

    # Thresholding to keep the image sharp
    (thresh, img) = cv2.threshold(img, 127, 255, cv2.THRESH_BINARY)

#Display the image
cv2.imshow("img",img)

cv2.waitKey(0)

输出

阈值之前

阈值处理后

备注

在我看来，范围 [0-90] 给出了最好的结果，但你可以尝试一下（更大的范围导致字母重叠，所以）
还可以尝试调整阈值，以便在阈值步骤中获得更好的调整和期望的结果。

如何在图像上随机旋转写每个字母

how to write each Letter in random rotation on the image

python

python-imaging-library

cv2

输出

备注