import cv2 as cv import argparse import sys import numpy as np backends = (cv.dnn.DNN_BACKEND_DEFAULT, cv.dnn.DNN_BACKEND_HALIDE, cv.dnn.DNN_BACKEND_INFERENCE_ENGINE, cv.dnn.DNN_BACKEND_OPENCV) targets = (cv.dnn.DNN_TARGET_CPU, cv.dnn.DNN_TARGET_OPENCL, cv.dnn.DNN_TARGET_OPENCL_FP16, cv.dnn.DNN_TARGET_MYRIAD) parser = argparse.ArgumentParser(description='Use this script to run object detection deep learning networks using OpenCV.') parser.add_argument('--input', help='Path to input image or video file. Skip this argument to capture frames from a camera.') parser.add_argument('--model', required=True, help='Path to a binary file of model contains trained weights. ' 'It could be a file with extensions .caffemodel (Caffe), ' '.pb (TensorFlow), .t7 or .net (Torch), .weights (Darknet)') parser.add_argument('--config', help='Path to a text file of model contains network configuration. ' 'It could be a file with extensions .prototxt (Caffe), .pbtxt (TensorFlow), .cfg (Darknet)') parser.add_argument('--framework', choices=['caffe', 'tensorflow', 'torch', 'darknet'], help='Optional name of an origin framework of the model. ' 'Detect it automatically if it does not set.') parser.add_argument('--classes', help='Optional path to a text file with names of classes to label detected objects.') parser.add_argument('--mean', nargs='+', type=float, default=[0, 0, 0], help='Preprocess input image by subtracting mean values. ' 'Mean values should be in BGR order.') parser.add_argument('--scale', type=float, default=1.0, help='Preprocess input image by multiplying on a scale factor.') parser.add_argument('--width', type=int, help='Preprocess input image by resizing to a specific width.') parser.add_argument('--height', type=int, help='Preprocess input image by resizing to a specific height.') parser.add_argument('--rgb', action='store_true', help='Indicate that model works with RGB input images instead BGR ones.') parser.add_argument('--thr', type=float, default=0.5, help='Confidence threshold') parser.add_argument('--nms', type=float, default=0.4, help='Non-maximum suppression threshold') parser.add_argument('--backend', choices=backends, default=cv.dnn.DNN_BACKEND_DEFAULT, type=int, help="Choose one of computation backends: " "%d: automatically (by default), " "%d: Halide language (http://halide-lang.org/), " "%d: Intel's Deep Learning Inference Engine (https://software.intel.com/openvino-toolkit), " "%d: OpenCV implementation" % backends) parser.add_argument('--target', choices=targets, default=cv.dnn.DNN_TARGET_CPU, type=int, help='Choose one of target computation devices: ' '%d: CPU target (by default), ' '%d: OpenCL, ' '%d: OpenCL fp16 (half-float precision), ' '%d: VPU' % targets) args = parser.parse_args() # Load names of classes classes = None if args.classes: with open(args.classes, 'rt') as f: classes = f.read().rstrip('\n').split('\n') # Load a network net = cv.dnn.readNet(args.model, args.config, args.framework) net.setPreferableBackend(args.backend) net.setPreferableTarget(args.target) confThreshold = args.thr nmsThreshold = args.nms def getOutputsNames(net): layersNames = net.getLayerNames() return [layersNames[i[0] - 1] for i in net.getUnconnectedOutLayers()] def postprocess(frame, outs): frameHeight = frame.shape[0] frameWidth = frame.shape[1] def drawPred(classId, conf, left, top, right, bottom): # Draw a bounding box. cv.rectangle(frame, (left, top), (right, bottom), (0, 255, 0)) label = '%.2f' % conf # Print a label of class. if classes: assert(classId < len(classes)) label = '%s: %s' % (classes[classId], label) labelSize, baseLine = cv.getTextSize(label, cv.FONT_HERSHEY_SIMPLEX, 0.5, 1) top = max(top, labelSize[1]) cv.rectangle(frame, (left, top - labelSize[1]), (left + labelSize[0], top + baseLine), (255, 255, 255), cv.FILLED) cv.putText(frame, label, (left, top), cv.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 0)) layerNames = net.getLayerNames() lastLayerId = net.getLayerId(layerNames[-1]) lastLayer = net.getLayer(lastLayerId) classIds = [] confidences = [] boxes = [] if net.getLayer(0).outputNameToIndex('im_info') != -1: # Faster-RCNN or R-FCN # Network produces output blob with a shape 1x1xNx7 where N is a number of # detections and an every detection is a vector of values # [batchId, classId, confidence, left, top, right, bottom] for out in outs: for detection in out[0, 0]: confidence = detection[2] if confidence > confThreshold: left = int(detection[3]) top = int(detection[4]) right = int(detection[5]) bottom = int(detection[6]) width = right - left + 1 height = bottom - top + 1 classIds.append(int(detection[1]) - 1) # Skip background label confidences.append(float(confidence)) boxes.append([left, top, width, height]) elif lastLayer.type == 'DetectionOutput': # Network produces output blob with a shape 1x1xNx7 where N is a number of # detections and an every detection is a vector of values # [batchId, classId, confidence, left, top, right, bottom] for out in outs: for detection in out[0, 0]: confidence = detection[2] if confidence > confThreshold: left = int(detection[3] * frameWidth) top = int(detection[4] * frameHeight) right = int(detection[5] * frameWidth) bottom = int(detection[6] * frameHeight) width = right - left + 1 height = bottom - top + 1 classIds.append(int(detection[1]) - 1) # Skip background label confidences.append(float(confidence)) boxes.append([left, top, width, height]) elif lastLayer.type == 'Region': # Network produces output blob with a shape NxC where N is a number of # detected objects and C is a number of classes + 4 where the first 4 # numbers are [center_x, center_y, width, height] classIds = [] confidences = [] boxes = [] for out in outs: for detection in out: scores = detection[5:] classId = np.argmax(scores) confidence = scores[classId] if confidence > confThreshold: center_x = int(detection[0] * frameWidth) center_y = int(detection[1] * frameHeight) width = int(detection[2] * frameWidth) height = int(detection[3] * frameHeight) left = center_x - width / 2 top = center_y - height / 2 classIds.append(classId) confidences.append(float(confidence)) boxes.append([left, top, width, height]) else: print('Unknown output layer type: ' + lastLayer.type) exit() indices = cv.dnn.NMSBoxes(boxes, confidences, confThreshold, nmsThreshold) for i in indices: i = i[0] box = boxes[i] left = box[0] top = box[1] width = box[2] height = box[3] drawPred(classIds[i], confidences[i], left, top, left + width, top + height) # Process inputs winName = 'Deep learning object detection in OpenCV' cv.namedWindow(winName, cv.WINDOW_NORMAL) def callback(pos): global confThreshold confThreshold = pos / 100.0 cv.createTrackbar('Confidence threshold, %', winName, int(confThreshold * 100), 99, callback) cap = cv.VideoCapture(args.input if args.input else 0) while cv.waitKey(1) < 0: hasFrame, frame = cap.read() if not hasFrame: cv.waitKey() break frameHeight = frame.shape[0] frameWidth = frame.shape[1] # Create a 4D blob from a frame. inpWidth = args.width if args.width else frameWidth inpHeight = args.height if args.height else frameHeight blob = cv.dnn.blobFromImage(frame, args.scale, (inpWidth, inpHeight), args.mean, args.rgb, crop=False) # Run a model net.setInput(blob) if net.getLayer(0).outputNameToIndex('im_info') != -1: # Faster-RCNN or R-FCN frame = cv.resize(frame, (inpWidth, inpHeight)) net.setInput(np.array([[inpHeight, inpWidth, 1.6]], dtype=np.float32), 'im_info') outs = net.forward(getOutputsNames(net)) postprocess(frame, outs) # Put efficiency information. t, _ = net.getPerfProfile() label = 'Inference time: %.2f ms' % (t * 1000.0 / cv.getTickFrequency()) cv.putText(frame, label, (0, 15), cv.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 0)) cv.imshow(winName, frame)