crnn_plate_recognition/demo.py

from plateNet import myNet_ocr
import torch
import torch.nn as nn
import cv2
import numpy as np
import os
import time
import argparse
from alphabets import plate_chr
from LPRNet import build_lprnet
def cv_imread(path):   #读取中文路径的图片
    img=cv2.imdecode(np.fromfile(path,dtype=np.uint8),-1)
    return img

def allFilePath(rootPath,allFIleList):
    fileList = os.listdir(rootPath)
    for temp in fileList:
        if os.path.isfile(os.path.join(rootPath,temp)):
            allFIleList.append(os.path.join(rootPath,temp))
        else:
            allFilePath(os.path.join(rootPath,temp),allFIleList)
            
mean_value,std_value=(0.588,0.193)
def decodePlate(preds):
    pre=0
    newPreds=[]
    for i in range(len(preds)):
        if preds[i]!=0 and preds[i]!=pre:
            newPreds.append(preds[i])
        pre=preds[i]
    return newPreds

def image_processing(img,device,img_size):
    img_h,img_w= img_size
    img = cv2.resize(img, (img_w,img_h))
    # img = np.reshape(img, (48, 168, 3))

    # normalize
    img = img.astype(np.float32)
    img = (img / 255. - mean_value) / std_value
    img = img.transpose([2, 0, 1])
    img = torch.from_numpy(img)

    img = img.to(device)
    img = img.view(1, *img.size())
    return img

def get_plate_result(img,device,model,img_size):
    # img = cv2.imread(image_path)
    input = image_processing(img,device,img_size)
    preds = model(input)
    # print(preds)
    preds=preds.view(-1).detach().cpu().numpy()
    newPreds=decodePlate(preds)
    plate=""
    for i in newPreds:
        plate+=plate_chr[int(i)]
    return plate

def init_model(device,model_path):
    check_point = torch.load(model_path,map_location=device)
    model_state=check_point['state_dict']
    cfg = check_point['cfg']
    model = myNet_ocr(num_classes=78,export=True,cfg=cfg)        #export  True 用来推理
    # model =build_lprnet(num_classes=len(plate_chr),export=True)
    model.load_state_dict(model_state)
    model.to(device)
    model.eval()
    return model
    
if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('--model_path', type=str, default='saved_model/best.pth', help='model.pt path(s)')  
    parser.add_argument('--image_path', type=str, default='images/test.jpg', help='source') 
    parser.add_argument('--img_h', type=int, default=48, help='height') 
    parser.add_argument('--img_w',type=int,default=168,help='width')
    parser.add_argument('--LPRNet',action='store_true',help='use LPRNet')  #True代表使用LPRNet ,False代表用plateNet
    parser.add_argument('--acc',type=bool,default='false',help=' get accuracy')  #标记好的图片，计算准确率
    device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
    # device =torch.device("cpu")
    opt = parser.parse_args()
    img_size = (opt.img_h,opt.img_w)
    model = init_model(device,opt.model_path)
    if os.path.isfile(opt.image_path):   #判断是单张图片还是目录
        right=0
        begin = time.time()
        img = cv_imread(opt.image_path)
        if img.shape[-1]!=3:
            img = cv2.cvtColor(img,cv2.COLOR_BGRA2BGR)
        plate=get_plate_result(img, device,model,img_size)
        print(plate)
    elif opt.acc:
        file_list=[]
        right=0
        allFilePath(opt.image_path,file_list)
        for pic_ in file_list:
            try:
                pic_name = os.path.basename(pic_)
                img = cv_imread(pic_)
                if img.shape[-1]!=3:
                    img = cv2.cvtColor(img,cv2.COLOR_BGRA2BGR)
                plate=get_plate_result(img,device,model,img_size)
                plate_ori = pic_.split('/')[-1].split('_')[0]
        # print(plate,"---",plate_ori)
                if(plate==plate_ori):

                    right+=1
                else:
                    print(plate_ori,"rec as ---> ",plate,pic_)
                    # print(plate,pic_name)
            except:
                    print("error")
        print("sum:%d ,right:%d , accuracy: %f"%(len(file_list),right,right/len(file_list)))
    else:
            file_list=[]
            allFilePath(opt.image_path,file_list)
            for pic_ in file_list:
                try:
                    pic_name = os.path.basename(pic_)
                    img = cv_imread(pic_)
                    if img.shape[-1]!=3:
                        img = cv2.cvtColor(img,cv2.COLOR_BGRA2BGR)
                    plate=get_plate_result(img,device,model)
                    print(plate,pic_name)
                except:
                    print("error")