OpenCV Python绑定:如何从内存中捕获图像 [英] OpenCV Python bindings: How do I capture an image from memory
问题描述
我有多个以字符串形式存储在内存中的jpeg图像.我想从它们生成视频(以便这些图片成为视频中的帧).
I have multiple jpeg images stored as strings in memory. I want to generate a video from them (so those pictures would be the frames in the video).
我该怎么办?
推荐答案
如果有一个字符串集合,每个字符串分别代表一个图像,则可以将StringIO
与PIL
组合以读取它,而无需将它们保存到文件中.然后,您可以使用numpy
从PIL
图像转换为OpenCV.另外,更新代码以使用新的OpenCV绑定.
If you have a collection of strings that individually represents one image each, you can combine StringIO
with PIL
to read it without saving them to files. Then you convert from a PIL
image to OpenCV by using numpy
. Also, update your code to use the new OpenCV bindings.
下面是一个示例,该示例复制了您拥有的内容(假定sys.argv [1]为输出视频文件的名称),您可能需要调整视频编解码器:
Here is an example that duplicates what you have (sys.argv[1] assumed to be the name of the output video file), you might need to adjust the video codec:
import sys
import numpy
import cv
import cv2
from cStringIO import StringIO
from PIL import Image
out_video = cv2.VideoWriter()
fourcc = cv.CV_FOURCC('D', 'I', 'V', 'X')
fps = 30
color = True
size = None
for fname in sys.argv[2:]:
data = open(fname).read() # Your String
s = StringIO(data)
img = Image.open(s)
if size and img.size != size:
img = img.resize(size)
else:
size = img.size
out_video.open(sys.argv[1], fourcc, fps, size, color)
out_video.write(cv2.cvtColor(numpy.array(img), cv2.COLOR_RGB2BGR))
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