0002-opencv dnn模块使用CUDA加速

待我称王封你为后i 2023-01-07 07:10 223阅读 0赞

### opencv调用yolov4模型 ###

可以参考[0001这篇文章][0001]

### 安装opencv-contrib-python ###

如果要用GPU加速，一定要安装这个包。不然就会报错。

pip install opencv-contrib-python

### CUDA加速 ###

添加以下两行代码就可以

net.setPreferableBackend(cv2.dnn.DNN_BACKEND_CUDA)
    net.setPreferableTarget(cv2.dnn.DNN_TARGET_CUDA)

### 案例脚本 ###

import cv2 as cv
    import numpy as np
    
    classFile = "coco.names" 
    with open(classFile, 'rt') as f:
        classes = f.read().rstrip('\n').split('\n')
    modelConf = 'coco.cfg' 
    modelWeights = 'coco.weights'
    net = cv.dnn.readNetFromDarknet(modelConf, modelWeights)
    net.setPreferableBackend(cv.dnn.DNN_BACKEND_CUDA)
    net.setPreferableTarget(cv.dnn.DNN_TARGET_CUDA)
    cap = cv.VideoCapture(inputFile)
    while(True):
          _,frame = cap.read()
         if np.shape(frame) != ():
                 blob = cv.dnn.blobFromImage(frame, 1/255, (inpWidth, inpHeight), [0,0,0],1,crop=False)
                 net.setInput(blob)
                 outs = net.forward(getOutputsNames(net))
                 frameExtract(frame, outs)
                 cv.imshow("video", frame)
                 k = cv.waitKey(1) & 0xFF
         else:
                 print("Reinitialize capture device ", time.ctime())
                 cap = cv.VideoCapture(inputFile)
                 time.sleep(1)
                 k = cv.waitKey(1) & 0xFF
         if k == 27:
                cv.destroyAllWindows()
                break

#### 参考链接 ####

[1. How to use OpenCV’s ‘dnn’ module with NVIDIA GPUs, CUDA, and cuDNN][1. How to use OpenCV_s _dnn_ module with NVIDIA GPUs_ CUDA_ and cuDNN]

[0001]: https://blog.csdn.net/zhonglongshen/article/details/112687882
[1. How to use OpenCV_s _dnn_ module with NVIDIA GPUs_ CUDA_ and cuDNN]: https://www.pyimagesearch.com/2020/02/03/how-to-use-opencvs-dnn-module-with-nvidia-gpus-cuda-and-cudnn/