在Flask中处理用户上传的图像 [英] Working with user uploaded image in Flask
问题描述
我建立了一个可以摄取图像的模型，可以在像素级别读取它，然后确定图像中是猫还是狗.出于教育目的，我现在正尝试将其放入Flask应用程序中(以前从未使用过Flask).到目前为止，我的工作:用户上传图像，Flask将图像保存到磁盘，图像被操纵并发送到模型，模型预测，然后从模板生成输出页面.现在，我想显示用户上传的图像，但是遇到了问题.适用的代码在这里:
I've built a model that can take in an image, read it at the pixel level, then decide if the image contains a cat or a dog. For educational purposes, I am now trying to put it into a Flask app (never used Flask before). What I have working so far: User uploads image, image is saved to disk by Flask, image is manipulated and sent to the model, model predicts and I generate an output page from a template. Now I'd like to display the image the user uploaded and I'm running into issues. The applicable code is here:
import flask
from flask import request, render_template
import numpy as np
import pandas as pd
from copy import deepcopy
from werkzeug import secure_filename
from PIL import Image
import catdog
# Initialize the app
app = flask.Flask(__name__)
@app.route("/")
def viz_page():
with open("frontend.html", 'r') as viz_file:
return viz_file.read()
@app.route("/uploader", methods=["GET","POST"])
def get_image():
if request.method == 'POST':
f = request.files['file']
sfname = 'images/'+str(secure_filename(f.filename))
f.save(sfname)
clf = catdog.classifier()
#clf.save_image(f.filename)
return render_template('result.html', pred = clf.predict(sfname), imgpath = sfname)
#--------- RUN WEB APP SERVER ------------#
# Start the app server on port 80
# (The default website port)
app.run(host='0.0.0.0', port=5000, debug=True)
和模板:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Dog vs Cat</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="http://d3js.org/d3.v3.min.js"></script>
</head>
<body>
<h3> Prediction: {{ pred }} </h3>
<br><br>
<img src={{imgpath}}>
<script>
</script>
</body>
</html>
我要返回的是预测:yada yada"部分，它运行良好.但是，图像始终返回空白.当我查看它时，它正在查找 http://localhost:5000/images/cat.4.jpg ，这意味着它不在正确的位置，但是我不确定如何动态抓取我想要的图像.我在这里找到了该指南:如何将上传的图像传递到Flask中的template.html ，我觉得这应该足以为我提供帮助，但是我只是没有得到想要让我看到的答案.帮助将不胜感激.
What I'm getting back out is the "Prediction: yada yada" part, which is working well. However, the image always comes back blank. When I look it's looking in http://localhost:5000/images/cat.4.jpg which I know means it's not looking in the right place, but I'm not sure how I can dynamically grab the image I want. I found this guide here: How to pass uploaded image to template.html in Flask and I feel like that should be enough to help me, but I'm just not getting what the answers are trying to get me to see. Help would be greatly appreciated.
奖金问题:是否可能永远不保存图像，而只是将其不断保存在Flask中的内存中?理想情况下，我永远不会保存图像，只使用它，然后在做出预测后将其扔掉.
Bonus question: is it possible to never save the image and just constantly keep it in memory in Flask? Ideally, I'd never save the image, I'd just work with it, then toss it after a prediction was made.
推荐答案
图像应保存在/static文件夹中，因此只需将保存路径更改为static/images
Image should be saved in /static folder, so just change saving path to static/images
sfname = 'static/images/'+str(secure_filename(f.filename))
因此HTML模板将准备就绪，看起来像这样
so than HTML template will be ready it will look like this
<img src="/static/images/your_image_here.jpg">
这篇关于在Flask中处理用户上传的图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
