yolov5 测试

import argparse
import time
from pathlib import Path

import cv2
import torch
import torch.backends.cudnn as cudnn
from numpy import random

import numpy as np

from models.experimental import attempt_load

from utils.datasets import LoadStreams,LoadStreams2, LoadImages,LoadWebcam,letterbox

from utils.general import check_img_size, check_requirements, non_max_suppression, apply_classifier, scale_coords,     xyxy2xywh, strip_optimizer, set_logging, increment_path
from utils.plots import plot_one_box
from utils.torch_utils import select_device, load_classifier, time_synchronized


device = select_device(‘‘)
augment = False
conf_thres=0.55
iou_thres=0.45
model = attempt_load(‘yolov5s.pt‘, map_location=device)
img_size = 640

names = model.module.names if hasattr(model, ‘module‘) else model.names
colors = [[random.randint(0, 255) for _ in range(3)] for _ in names]


def detectionObjectFunction():
    vc = cv2.VideoCapture(2)
    #rval, frame = vc.read()
    while True:
        rval, cameraImg = vc.read()

        
        img = letterbox(cameraImg, new_shape=img_size)[0]
        # Convert
        img = img[:, :, ::-1].transpose(2, 0, 1)  # BGR to RGB, to 3x416x416
        img = np.ascontiguousarray(img)

        ####################################################
        img = torch.from_numpy(img).to(device)
        #img = img.half() if half else img.float()  # uint8 to fp16/32
        im0 = cameraImg.copy()
        
        img = img.half()
        img = img.float()
        img /= 255.0  # 0 - 255 to 0.0 - 1.0
        if img.ndimension() == 3:
            img = img.unsqueeze(0)

        # Inference
        t1 = time_synchronized()
        pred = model(img, augment=augment)[0]
        #pred = model(img, augment=opt.augment)[0]

        #print(‘thres:%d ‘%conf_thres)
        # Apply NMS
        pred = non_max_suppression(pred, conf_thres, iou_thres)
        #def non_max_suppression(prediction, conf_thres=0.25, iou_thres=0.45, classes=None, agnostic=False, labels=()):
        t2 = time_synchronized()
        
        # Apply Classifier
        
        # Process detections
        for i, det in enumerate(pred):  # detections per image
            # batch_size >= 1
            #if webcam:  
            #    p, s, im0, frame = path[i], ‘%g: ‘ % i, im0s[i].copy(), dataset.count
            #else:
            #    p, s, im0, frame = path, ‘‘, im0s, getattr(dataset, ‘frame‘, 0)
            #    
            #p = Path(p)  # to Path
            #save_path = str(save_dir / p.name)  # img.jpg
            #txt_path = str(save_dir / ‘labels‘ / p.stem) + (‘‘ if dataset.mode == ‘image‘ else f‘_{frame}‘)  # img.txt
            #s += ‘%gx%g ‘ % img.shape[2:]  # print string

            # normalization gain whwh
            #gn = torch.tensor(im0.shape)[[1, 0, 1, 0]]  
            if len(det):
                # Rescale boxes from img_size to im0 size
                det[:, :4] = scale_coords(img.shape[2:], det[:, :4], im0.shape).round()
                
                # Print results
                for c in det[:, -1].unique():
                    n = (det[:, -1] == c).sum()  # detections per class
                    #s += f‘{n} {names[int(c)]}s, ‘  # add to string
        
                # Write results
                for *xyxy, conf, cls in reversed(det):
                    
                    
                    label = f‘{names[int(cls)]} {conf:.2f}‘
                    #plot_one_box2(xyxy, im0, label=label, color=colors[int(cls)], line_thickness=2)
                    #plot_one_box2(xyxy, im0, label=label, color=(0,255,0), line_thickness=2)
                    #plot_one_box(xyxy, im0, label=label, color=(0,255,0), line_thickness=2)
                    plot_one_box(xyxy, im0, label=label, color=colors[int(cls)], line_thickness=2)
                
            # Print time (inference + NMS)
            print(f‘detection time. ({t2 - t1:.3f}s)‘)

            # Stream results
            #if view_img:
            cv2.imshow("win1", im0)
            #img2 = im0.copy()
            


        ####################################################
        #pass

        if cv2.waitKey(10) == 27:
            break



detectionObjectFunction()