Python OpenCV图像到字节字符串以进行JSON传输

Python OpenCV图像到字节字符串以进行JSON传输

您不需要将缓冲区保存到文件。以下脚本从网络摄像头捕获图像，将其编码为JPG图像，然后将该数据转换为可打印的base64编码，该编码可与JSON一起使用：

import cv2import base64cap = cv2.VideoCapture(0)retval, image = cap.read()retval, buffer = cv2.imenpre('.jpg', image)jpg_as_text = base64.b64enpre(buffer)print(jpg_as_text)cap.release()

给你一些开始像：

/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAIBAQEBAQIBAQECAgICAgQDAgICAgUEBAMEBgUGBgYFBgYGBwkIBgcJBwYGCAsICQoKCg

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可以扩展它以显示如何将其转换回二进制，然后将数据写入测试文件以显示转换成功：

import cv2import base64cap = cv2.VideoCapture(0)retval, image = cap.read()cap.release()# Convert captured image to JPGretval, buffer = cv2.imenpre('.jpg', image)# Convert to base64 encoding and show start of datajpg_as_text = base64.b64enpre(buffer)print(jpg_as_text[:80])# Convert back to binaryjpg_original = base64.b64depre(jpg_as_text)# Write to a file to show conversion workedwith open('test.jpg', 'wb') as f_output:    f_output.write(jpg_original)

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要将图像作为图像缓冲区（而不是JPG格式）取回，请尝试：

jpg_as_np = np.frombuffer(jpg_original, dtype=np.uint8)image_buffer = cv2.imdepre(jpg_as_np, flags=1)