yolov5_tflite_image_inference.py

from yolov5_tflite_inference import yolov5_tflite
import argparse
import cv2
import time
from PIL import Image, ImageOps
import numpy as np
from utils import letterbox_image, scale_coords



def detect_image(weights,image_url,img_size,conf_thres,iou_thres):



    start_time = time.time()
    
    
    #image = cv2.imread(image_url)
    image = Image.open(image_url)
    original_size = image.size[:2]
    size = (img_size,img_size)
    image_resized = letterbox_image(image,size)
    img = np.asarray(image)
    
    #image = ImageOps.fit(image, size, Image.ANTIALIAS)
    image_array = np.asarray(image_resized)

    normalized_image_array = image_array.astype(np.float32) / 255.0

    

    yolov5_tflite_obj = yolov5_tflite(weights,img_size,conf_thres,iou_thres)

    result_boxes, result_scores, result_class_names = yolov5_tflite_obj.detect(normalized_image_array)

    
    if len(result_boxes) > 0:
        result_boxes = scale_coords(size,np.array(result_boxes),(original_size[1],original_size[0]))
        font = cv2.FONT_HERSHEY_SIMPLEX 
        
        # org 
        org = (20, 40) 
            
        # fontScale 
        fontScale = 0.5
            
        # Blue color in BGR 
        color = (0, 255, 0) 
            
        # Line thickness of 1 px 
        thickness = 1

        for i,r in enumerate(result_boxes):

            org = (int(r[0]),int(r[1]))
            cv2.rectangle(img, (int(r[0]),int(r[1])), (int(r[2]),int(r[3])), (255,0,0), 1)
            cv2.putText(img, str(int(100*result_scores[i])) + '%  ' + str(result_class_names[i]), org, font,  
                        fontScale, color, thickness, cv2.LINE_AA)

        save_result_filepath = image_url.split('/')[-1].split('.')[0] + 'yolov5_output.jpg'
        cv2.imwrite(save_result_filepath,img[:,:,::-1])

        end_time = time.time()

        print('FPS:',1/(end_time-start_time))
        print('Total Time Taken:',end_time-start_time)



if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('-w','--weights', type=str, default='yolov5s-fp16.tflite', help='model.tflite path(s)')
    parser.add_argument('-i','--img_path', type=str, required=True, help='image path')  
    parser.add_argument('--img_size', type=int, default=416, help='image size')  
    parser.add_argument('--conf_thres', type=float, default=0.25, help='object confidence threshold')
    parser.add_argument('--iou_thres', type=float, default=0.45, help='IOU threshold for NMS')

    
    opt = parser.parse_args()
    
    print(opt)
    detect_image(opt.weights,opt.img_path,opt.img_size,opt.conf_thres,opt.iou_thres)