HTML通过Ajax上传图像至Django后端并转换为Mat图像

<script src="js/jquery-1.12.4.min.js"></script>
    <script>
        function fucTest() {
            let form_data = new FormData();
            let file_info = $("#img")[0].files[0];
            form_data.append('img', file_info);
            $.ajax({
                url: "http://127.0.0.1:8000/test/", // ocr服务url
                type: 'POST',
                data: form_data,
                processData: false,
                contentType: false,
                beforeSend: function(xhr, settings) {
                    xhr.setRequestHeader("X-CSRFToken", "{{ csrf_token }}")
                },
                success: function (ret) {
                    $("#result").text(ret)
                }
            })
        }
</script>
......
<input type="file" name="img" id="img">
<button onclick="fucTest()">ocr test</button>
<p id="result"></p>

class Index(View):
    def get(self, request):
        return render(request, 'index.html')
class OCRView(View):
    def post(self, request):
        img = request.FILES.get('img')
        parser = ImageFile.Parser()
        for chunk in img.chunks():
            parser.feed(chunk)
        img = parser.close()
        img = cv2.cvtColor(np.asarray(img), cv2.COLOR_RGB2BGR)
        result = "图像的尺寸：" + img.shape[1] + "_" + img.shape[0]
        return HttpResponse(result)

urlpatterns = [
    path('', Index.as_view(), name='index'),
    path('test/', OCRView.as_view(), name='test'),
]