我正在使用opencv和使用python flask api对图像进行一些处理。我想在浏览器中显示图像。
import cv2
from flask import Flask, request, make_response
import base64
import numpy as np
import urllib
app = Flask(__name__)
@app.route('/endpoint', methods=['GET'])
def process():
image_url = request.args.get('imageurl')
requested_url = urllib.urlopen(image_url)
image_array = np.asarray(bytearray(requested_url.read()), dtype=np.uint8)
img = cv2.imdecode(image_array, -1)
# Do some processing, get output_img
retval, buffer = cv2.imencode('.png', output_img)
png_as_text = base64.b64encode(buffer)
response = make_response(png_as_text)
response.headers['Content-Type'] = 'image/png'
return response
if __name__ == '__main__':
app.run(debug=True)
然而,我得到空的,无效的图像作为输出。我做错了什么?
答案 0 :(得分:4)
如评论中所述,您需要返回图像的字节,而不是base64字符串。
尝试以下方法:
retval, buffer = cv2.imencode('.png', output_img)
response = make_response(buffer.tobytes())