3

在使用 opencv 检测到人脸后，我正在尝试将图像上传到 s3。jpg 文件被上传到 s3 但我无法打开图像。

我可以通过首先将图像保存到本地磁盘然后将其上传到 s3 来正确上传，但我想在检测到人脸后直接执行此操作。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
4

3 回答 3

1

替换这一行：

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

经过

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。

于 2019-06-14T07:15:26.903 回答
0

点安装枕头

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')

这段代码对我有用，但它给上传的图像带来了一点蓝色阴影。所以我决定先将图像保存到本地磁盘，然后上传到 S3

cv2.imwrite(imageName, image)
local_image = open('./'+imageName, 'rb')
s3.put_object(Bucket="Bucket Name", Key = imageName, Body = local_image, ContentType= 'image/png')
于 2019-04-09T04:08:36.810 回答
0

我相信该image对象不是 JPEG 编码的二进制表示。这是一个用于数学目的的 NumPy 对象

您应该检查Python OpenCV 将图像转换为字节字符串吗？和

imencode

将图像编码到内存缓冲区中。生成 S3 可以获取的对象

于 2019-04-09T02:36:57.083 回答