内存中的python OpenCV jpeg压缩 [英] python OpenCV jpeg compression in memory

问题描述

在OpenCV中，可以使用某种jpeg压缩将图像保存到磁盘.还有在内存中执行此操作的方法吗?还是应该使用cv2.imsave()编写一个函数来加载文件并再次将其从磁盘中删除?如果有人知道更好的方法，那也很好.

In OpenCV it is possible to save an image to disk with a certain jpeg compression. Is there also a way to do this in memory? Or should I write a function using cv2.imsave() that loads the file and removes it again from disk? If anyone knows a better way that is also fine.

用例是实时数据扩充.使用OpenCV以外的其他东西可能会导致不必要的开销.

The use case is real-time data augmentation. Using something else than OpenCV would cause possibly unnecessary overhead.

所需功能示例im = cv2.imjpgcompress(90)

推荐答案

您可以使用imencode:

encode_param = [int(cv2.IMWRITE_JPEG_QUALITY), 90]
result, encimg = cv2.imencode('.jpg', img, encode_param)

( IMWRITE_JPEG_QUALITY 的默认值为95 )

(The default value for IMWRITE_JPEG_QUALITY is 95.)

您可以使用以下方法将其解码回去:

You can decode it back with:

decimg = cv2.imdecode(encimg, 1)

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