Question

我是一个使用python的新人，并尝试使用线程捕获屏幕（win32gui）和相机图像（opencv）。但是我的代码速度不够快，无法捕获图像。当脚本在单个线程上工作时，帧速率正常（大约30fps）。但是当两个线程启动时帧速率下降到10fps。我该怎么做才能将帧速率提高到30 fps？我的笔记本电脑是赢64，i7-5500U，RAM 32GB，python 2.7（32位）。相机是逻辑网络摄像头C905。

import win32gui, win32ui, win32con
import cv2
import os
import datetime, time
import threading


def screen_capture(saveDC, mfcDC, w, h):
    SaveDirectory = r'C:\Users\Desktop\1'
    start_time = time.time()
    end_time = time.time()

    while (end_time - start_time < 8):
        saveDC.BitBlt((0, 0), (w, h), mfcDC, (300, 400), win32con.SRCCOPY)
        bmpname = os.path.join(SaveDirectory, str(datetime.datetime.now()).replace(':', '-') + '.bmp')
        saveBitMap.SaveBitmapFile(saveDC, bmpname)
        end_time = time.time()

def camera_image(cap):
    dirname = 'C:/Users/Desktop/2'
    start_time = time.time()
    end_time = time.time()

    while(end_time - start_time < 8):
        # Capture frame-by-frame
        ret, frame = cap.read()
        # cv2.imshow('frame', frame)
        timestamp = str(datetime.datetime.now()).replace(':', '-')
        cv2.imwrite(os.path.join(dirname, timestamp + ".jpg"), frame)
        end_time = time.time()


cap = cv2.VideoCapture(0)
ret = cap.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH, 960)  # width
cap.set(4, 720)  # Height
cap.set(cv2.cv.CV_CAP_PROP_FPS, 90)  # Frame rate

w = 1500
h = 900
hwnd = win32gui.GetDesktopWindow()
hwndDC = win32gui.GetWindowDC(hwnd)
mfcDC = win32ui.CreateDCFromHandle(hwndDC)
saveDC = mfcDC.CreateCompatibleDC()
saveBitMap = win32ui.CreateBitmap()
saveBitMap.CreateCompatibleBitmap(mfcDC, w, h)
saveDC.SelectObject(saveBitMap)

t1 = threading.Thread(name=camera_image, target=camera_image, args=(cap,))
t2 = threading.Thread(name=screen_capture, target=screen_capture, args=(saveDC, mfcDC, w, h,))

t1.start()
t2.start()

如何使python线程更快（相机成像和屏幕捕获）

0 个答案: