Question

我使用opencv检测到面部后试图将图像上传到s3。 jpg文件已上传到s3，但我无法打开图像。

我能够通过先将图像保存到本地磁盘然后将其上传到s3来正确上传，但是我想在检测到脸部之后直接进行操作。知道怎么做吗？

# import the necessary packages

# capture frames from the camera

for frame in camera.capture_continuous(rawCapture, format="bgr", use_video_port=True):
    # grab the raw NumPy array representing the image, then initialize the timestamp
    # and occupied/unoccupied text
    image = frame.array

    gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

    faces = face_cascade.detectMultiScale(
        gray,
        scaleFactor=1.1,
        minNeighbors=5,
        minSize=(30, 30),
        flags=cv2.CASCADE_SCALE_IMAGE
    )

    # Draw a rectangle around the faces
    for (x, y, w, h) in faces:
        cv2.rectangle(image, (x, y), (x+w, y+h), (0, 255, 0), 2)

    # cv2.imwrite('newobama.png', image)

    if len(faces):
        imageName = str(time.strftime("%Y_%m_%d_%H_%M")) + '.jpg'
        #This is not working
        s3.put_object(Bucket="surveillance-cam", Key = imageName, Body = bytes(image), ContentType= 'image/jpeg')   

    # show the frame
    cv2.imshow("Frame", image)
    key = cv2.waitKey(1) & 0xFF

    # clear the stream in preparation for the next frame
    rawCapture.truncate(0)

    # if the `q` key was pressed, break from the loop
    if key == ord("q"):
        break

Answer 1

我相信image对象不是JPEG编码的二进制表示形式。这是出于数学目的的NumPy对象

您应该检查Python OpenCV convert image to byte string?和

imencode

Encodes an image放入内存缓冲区。生成S3可以带走的物体

Answer 2

pip安装枕头

from PIL import Image
from io import BytesIO

img = Image.fromarray(image)
out_img = BytesIO()
img.save(out_img, format='png')
out_img.seek(0)
s3.put_object(Bucket="Bucket Name", Key = imageName, Body = local_image, ContentType= 'image/png')

此代码对我有用，但是它使上传的图像略带蓝色阴影。因此，我决定先将图像保存到本地磁盘，然后再上传到S3

cv2.imwrite(imageName, image)
local_image = open('./'+imageName, 'rb')
s3.put_object(Bucket="Bucket Name", Key = imageName, Body = local_image, ContentType= 'image/png')

Answer 3

替换此行：

    s3.put_object(Bucket="surveillance-cam", Key = imageName, Body = bytes(image), ContentType= 'image/jpeg')

作者

image_string = cv2.imencode('.jpg', image)[1].tostring()
s3.put_object(Bucket="surveillance-cam", Key = imageName, Body=image_string)

它应该可以工作。

将图像从opencv上传到s3存储桶

3 个答案: