首页 > 解决方案 > 如何保存通过camera.capture_continuous(格式rgb)读取的图像并将其保存到文件中

问题描述

我通过 camera.capture_continuous(stream,format='rgb', use_video_port=True, resize=(width, height) 读取 raspi 相机,将其馈送到珊瑚边缘 USB 加速器。这非常有效。但现在我想保存某些图像(取决于分析)到硬盘。

我是 python 初学者... file.write 没有用。我假设是因为我得到了某种原始 rgb 图像数据而不是 jpg。

我希望能够将图像存储为 jpg。谁能建议使用什么功能?

更新

我尝试了以下

import argparse
import os
import io
import time
from collections import deque
import numpy as np
import picamera
from PIL import Image
import edgetpu.classification.engine

def main():

  stream = io.BytesIO()
  engine = edgetpu.classification.engine.ClassificationEngine(args.model)

  for foo in camera.capture_continuous(stream,
                                       format='rgb',
                                       use_video_port=True,
                                       resize=(width, height)):
      stream.truncate()
      stream.seek(0)
      input = np.frombuffer(stream.getvalue(), dtype=np.uint8)
      results = engine.ClassifyWithInputTensor(input, top_k=3)

      ...

      image = Image.fromarray(input.astype('uint8'), 'RGB')
      image.save("imgs/image_" + str(i) + ".jpg")

但只得到一个错误:

Traceback (most recent call last):
  File "mio.py", line 85, in <module>
    main()
  File "mio.py", line 75, in main
    image = Image.fromarray(input.astype('uint8'), 'RGB')
  File "/usr/lib/python3/dist-packages/PIL/Image.py", line 2529, in fromarray
    size = shape[1], shape[0]
IndexError: tuple index out of range

我究竟做错了什么?

标签: pythonpython-3.xcameraraspberry-pigoogle-coral

解决方案


您可以使用Pillow库将图像保存到磁盘。就像是:

pip install Pillow numpy

import numpy as np
from PIL import Image
pixels = np.array([[[255, 0, 0], [0, 255, 0]], [[0, 0, 255], [255, 255, 0]]])
image = Image.fromarray(pixels.astype('uint8'), 'RGB')
image.save('out.jpg')

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