我尝试在不将 opencv 图像写入磁盘的情况下渲染烧瓶模板。也许有人有想法如何实现这一点。
@app.route('/upload')
def upload_file():
return render_template('upload.html')
@app.route('/uploader', methods = ['GET', 'POST'])
def uploaded_file():
if request.method == 'POST':
photo = request.files['file']
in_memory_file = io.BytesIO()
photo.save(in_memory_file)
data = np.fromstring(in_memory_file.getvalue(), dtype=np.uint8)
color_image_flag = 1
img = cv2.imdecode(data, color_image_flag)
frame,res=recogn(img)
imencoded = cv2.imencode(".jpg", frame)[1]
###If i put there next line it will work(i can render template
###photo=file), but i don't want write image
###to disk
###cv2.imwrite('file.jpg',frame)
return render_template('from_file.html', photo=imencoded)
Template look like this
<h3><img src="{{ photo }}" width="50%"></h3>
您可以对缓冲区进行 base64 编码，它不是很漂亮，但它应该可以工作。
import base64
@app.route('/uploader', methods = ['GET', 'POST'])
def uploaded_file():
if request.method == 'POST':
photo = request.files['file']
in_memory_file = io.BytesIO()
photo.save(in_memory_file)
data = np.fromstring(in_memory_file.getvalue(), dtype=np.uint8)
color_image_flag = 1
img = cv2.imdecode(data, color_image_flag)
frame,res=recogn(img)
imencoded = cv2.imencode(".jpg", frame)[1]
jpg_as_text = base64.b64encode(imencoded)
return render_template('from_file.html', photo=jpg_as_text)
然后你的模板看起来像
<h3><img src="data:image/jpeg;charset=utf-8;base64, {{photo}}" width="50%"></h3>
试一试吧。
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我来说两句