kopia lustrzana https://github.com/OpenDroneMap/WebODM
86 wiersze
2.7 KiB
Python
86 wiersze
2.7 KiB
Python
import os
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import io
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from .tasks import TaskNestedView
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from rest_framework import exceptions
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from app.models import ImageUpload
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from app.models.task import assets_directory_path
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from PIL import Image
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from django.http import HttpResponse
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from .tasks import download_file_response
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import numpy as np
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def normalize(img):
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"""
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Linear normalization
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http://en.wikipedia.org/wiki/Normalization_%28image_processing%29
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"""
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arr = np.array(img).astype('float')
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minval = arr.min()
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maxval = arr.max()
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if minval != maxval:
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arr -= minval
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arr *= (255.0/(maxval-minval))
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return Image.fromarray(arr)
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class Thumbnail(TaskNestedView):
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def get(self, request, pk=None, project_pk=None, image_filename=""):
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"""
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Generate a thumbnail on the fly for a particular task's image
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"""
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task = self.get_and_check_task(request, pk)
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image = ImageUpload.objects.filter(task=task, image=assets_directory_path(task.id, task.project.id, image_filename)).first()
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if image is None:
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raise exceptions.NotFound()
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image_path = image.path()
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if not os.path.isfile(image_path):
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raise exceptions.NotFound()
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try:
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thumb_size = int(self.request.query_params.get('size', 512))
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if thumb_size < 1:
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raise ValueError()
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quality = int(self.request.query_params.get('quality', 75))
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if quality < 0 or quality > 100:
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raise ValueError()
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except ValueError:
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raise exceptions.ValidationError("Invalid query parameters")
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with Image.open(image_path) as img:
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if img.mode != 'RGB':
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img = normalize(img)
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img = img.convert('RGB')
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img.thumbnail((thumb_size, thumb_size))
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output = io.BytesIO()
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img.save(output, format='JPEG', quality=quality)
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res = HttpResponse(content_type="image/jpeg")
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res['Content-Disposition'] = 'inline'
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res.write(output.getvalue())
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output.close()
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return res
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class ImageDownload(TaskNestedView):
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def get(self, request, pk=None, project_pk=None, image_filename=""):
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"""
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Download a task's image
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"""
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task = self.get_and_check_task(request, pk)
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image = ImageUpload.objects.filter(task=task, image=assets_directory_path(task.id, task.project.id, image_filename)).first()
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if image is None:
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raise exceptions.NotFound()
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image_path = image.path()
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if not os.path.isfile(image_path):
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raise exceptions.NotFound()
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return download_file_response(request, image_path, 'attachment') |