import cv2 as cv import argparse import numpy as np import sys import time from threading import Thread if sys.version_info[0] == 2: import Queue as queue else: import queue from common import * from tf_text_graph_common import readTextMessage from tf_text_graph_ssd import createSSDGraph from tf_text_graph_faster_rcnn import createFasterRCNNGraph 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(add_help=False) parser.add_argument('--zoo', default=os.path.join(os.path.dirname(os.path.abspath(__file__)), 'models.yml'), help='An optional path to file with preprocessing parameters.') parser.add_argument('--input', help='Path to input image or video file. Skip this argument to capture frames from a camera.') parser.add_argument('--out_tf_graph', default='graph.pbtxt', help='For models from TensorFlow Object Detection API, you may ' 'pass a .config file which was used for training through --config ' 'argument. This way an additional .pbtxt file with TensorFlow graph will be created.') parser.add_argument('--framework', choices=['caffe', 'tensorflow', 'torch', 'darknet', 'dldt'], help='Optional name of an origin framework of the model. ' 'Detect it automatically if it does not set.') 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) parser.add_argument('--async', type=int, default=0, dest='asyncN', help='Number of asynchronous forwards at the same time. ' 'Choose 0 for synchronous mode') args, _ = parser.parse_known_args() add_preproc_args(args.zoo, parser, 'object_detection') parser = argparse.ArgumentParser(parents=[parser], description='Use this script to run object detection deep learning networks using OpenCV.', formatter_class=argparse.ArgumentDefaultsHelpFormatter) args = parser.parse_args() args.model = findFile(args.model) args.config = findFile(args.config) args.classes = findFile(args.classes) # If config specified, try to load it as TensorFlow Object Detection API's pipeline. config = readTextMessage(args.config) if 'model' in config: print('TensorFlow Object Detection API config detected') if 'ssd' in config['model'][0]: print('Preparing text graph representation for SSD model: ' + args.out_tf_graph) createSSDGraph(args.model, args.config, args.out_tf_graph) args.config = args.out_tf_graph elif 'faster_rcnn' in config['model'][0]: print('Preparing text graph representation for Faster-RCNN model: ' + args.out_tf_graph) createFasterRCNNGraph(args.model, args.config, args.out_tf_graph) args.config = args.out_tf_graph # 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(cv.samples.findFile(args.model), cv.samples.findFile(args.config), args.framework) net.setPreferableBackend(args.backend) net.setPreferableTarget(args.target) outNames = net.getUnconnectedOutLayersNames() confThreshold = args.thr nmsThreshold = args.nms 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 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]) top = int(detection[4]) right = int(detection[5]) bottom = int(detection[6]) width = right - left + 1 height = bottom - top + 1 if width <= 2 or height <= 2: 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 = int(center_x - width / 2) top = int(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(cv.samples.findFileOrKeep(args.input) if args.input else 0) class QueueFPS(queue.Queue): def __init__(self): queue.Queue.__init__(self) self.startTime = 0 self.counter = 0 def put(self, v): queue.Queue.put(self, v) self.counter += 1 if self.counter == 1: self.startTime = time.time() def getFPS(self): return self.counter / (time.time() - self.startTime) process = True # # Frames capturing thread # framesQueue = QueueFPS() def framesThreadBody(): global framesQueue, process while process: hasFrame, frame = cap.read() if not hasFrame: break framesQueue.put(frame) # # Frames processing thread # processedFramesQueue = queue.Queue() predictionsQueue = QueueFPS() def processingThreadBody(): global processedFramesQueue, predictionsQueue, args, process futureOutputs = [] while process: # Get a next frame frame = None try: frame = framesQueue.get_nowait() if args.asyncN: if len(futureOutputs) == args.asyncN: frame = None # Skip the frame else: framesQueue.queue.clear() # Skip the rest of frames except queue.Empty: pass if not frame is None: 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, size=(inpWidth, inpHeight), swapRB=args.rgb, ddepth=cv.CV_8U) processedFramesQueue.put(frame) # Run a model net.setInput(blob, scalefactor=args.scale, mean=args.mean) 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') if args.asyncN: futureOutputs.append(net.forwardAsync()) else: outs = net.forward(outNames) predictionsQueue.put(np.copy(outs)) while futureOutputs and futureOutputs[0].wait_for(0): out = futureOutputs[0].get() predictionsQueue.put(np.copy([out])) del futureOutputs[0] framesThread = Thread(target=framesThreadBody) framesThread.start() processingThread = Thread(target=processingThreadBody) processingThread.start() # # Postprocessing and rendering loop # while cv.waitKey(1) < 0: try: # Request prediction first because they put after frames outs = predictionsQueue.get_nowait() frame = processedFramesQueue.get_nowait() postprocess(frame, outs) # Put efficiency information. if predictionsQueue.counter > 1: label = 'Camera: %.2f FPS' % (framesQueue.getFPS()) cv.putText(frame, label, (0, 15), cv.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 0)) label = 'Network: %.2f FPS' % (predictionsQueue.getFPS()) cv.putText(frame, label, (0, 30), cv.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 0)) label = 'Skipped frames: %d' % (framesQueue.counter - predictionsQueue.counter) cv.putText(frame, label, (0, 45), cv.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 0)) cv.imshow(winName, frame) except queue.Empty: pass process = False framesThread.join() processingThread.join()