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197 lines
8.3 KiB
197 lines
8.3 KiB
#!/usr/bin/env python3
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import cv2
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import numpy as np
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from scipy.spatial.transform import Rotation
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import deep_models_shared_python3 as dm
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class ObjectDetector:
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def __init__(self, models_directory, use_tiny_yolo3 = True, confidence_threshold=0.2, use_neural_compute_stick=False):
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# Load the models
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models_dir = models_directory + 'darknet/'
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print('Using the following directory to load object detector models:', models_dir)
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if use_tiny_yolo3:
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model_filename = models_dir + 'tiny_yolo_v3/yolov3-tiny.weights'
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config_filename = models_dir + 'tiny_yolo_v3/yolov3-tiny.cfg'
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classes_filename = models_dir + 'tiny_yolo_v3/object_detection_classes_yolov3.txt'
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input_width = 416
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input_height = 416
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else:
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model_filename = models_dir + 'yolo_v3/yolov3.weights'
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config_filename = models_dir + 'yolo_v3/yolov3.cfg'
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classes_filename = models_dir + 'yolo_v3/object_detection_classes_yolov3.txt'
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input_width = 608
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input_height = 608
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self.input_width = input_width
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self.input_height = input_height
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self.confidence_threshold = confidence_threshold
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self.non_maximal_suppression = 0.01
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self.scale = 0.00392
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self.rgb = True
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self.mean = (0.0, 0.0, 0.0)
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if use_tiny_yolo3:
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print('using YOLO V3 Tiny')
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else:
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print('using YOLO V3')
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print('models_dir =', models_dir)
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print('model_filename =', model_filename)
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print('config_filename =', config_filename)
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print('classes_filename =', classes_filename)
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classes_file = open(classes_filename, 'rt')
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raw_classes_text = classes_file.read()
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classes_file.close()
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self.object_class_labels = raw_classes_text.rstrip('\n').split('\n')
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self.num_object_classes = len(self.object_class_labels)
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self.object_detection_model = cv2.dnn.readNet(model_filename, config_filename, 'darknet')
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# attempt to use Neural Compute Stick 2
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if use_neural_compute_stick:
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print('ObjectDetector.__init__: Attempting to use an Intel Neural Compute Stick 2 using the following command: self.object_detection_model.setPreferableTarget(cv2.dnn.DNN_TARGET_MYRIAD)')
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self.object_detection_model.setPreferableTarget(cv2.dnn.DNN_TARGET_MYRIAD)
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dm.print_model_info(self.object_detection_model, 'object_detection_model')
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self.output_layer_names = self.object_detection_model.getUnconnectedOutLayersNames()
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def get_landmark_names(self):
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return None
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def get_landmark_colors(self):
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return None
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def get_landmark_color_dict(self):
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return None
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def apply_to_image(self, rgb_image, draw_output=False):
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original_height, original_width, num_color = rgb_image.shape
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object_image_blob = cv2.dnn.blobFromImage(rgb_image,
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1.0,
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size=(self.input_width, self.input_height),
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swapRB=self.rgb,
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ddepth=cv2.CV_8U)
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self.object_detection_model.setInput(object_image_blob, scalefactor=self.scale, mean=self.mean)
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object_detections = self.object_detection_model.forward(self.output_layer_names)
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# object_detections is a list
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# YOLO v3 Tiny
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# object_detections = [ array with shape (507, 85),
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# array with shape (2028, 85) ]
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# YOLO v3
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# object_detections = [ array with shape (1083, 85),
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# array with shape (4332, 85),
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# array with shape (17328, 85) ]
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# each element of the list has a constant shape RxC
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# Each of the R rows represents a detection
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# [0:5] (the first 4 numbers) specify a bounding box
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# [box_center_x, box_center_y, box_width, box_height], where
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# each element is a scalar between 0.0 and 1.0 that can be
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# multiplied by the original input image dimensions to recover
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# the bounding box in the original image.
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# [5:] (the remaining 81 numbers) represent the confidence
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# that a particular class was detected in the bounding box (80
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# COCO object classes) plus one class that represents the
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# background and hence no detection (most likely - my
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# interpretation without really looking closely at it).
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def bound_x(x_in):
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x_out = max(x_in, 0)
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x_out = min(x_out, original_width - 1)
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return x_out
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def bound_y(y_in):
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y_out = max(y_in, 0)
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y_out = min(y_out, original_height - 1)
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return y_out
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results = []
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for detections in object_detections:
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object_class_confidences = detections[:,5:]
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best_object_classes = np.argmax(object_class_confidences, axis=1)
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# only consider non-background classes
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non_background_selector = best_object_classes < self.num_object_classes
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detected_objects = detections[non_background_selector]
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best_object_classes = best_object_classes[non_background_selector]
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# collect and prepare detected objects
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for detection, object_class_id in zip(detected_objects, best_object_classes):
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confidence = detection[5:][object_class_id]
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if confidence > self.confidence_threshold:
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class_label = self.object_class_labels[object_class_id]
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box_center_x, box_center_y, box_width, box_height = detection[:4]
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x_min = (box_center_x - (box_width / 2.0)) * original_width
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y_min = (box_center_y - (box_height / 2.0)) * original_height
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x_max = x_min + (box_width * original_width)
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y_max = y_min + (box_height * original_height)
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x_min = bound_x(int(round(x_min)))
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y_min = bound_y(int(round(y_min)))
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x_max = bound_x(int(round(x_max)))
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y_max = bound_y(int(round(y_max)))
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box = (x_min, y_min, x_max, y_max)
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print(class_label, ' detected')
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results.append({'class_id': object_class_id,
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'label': class_label,
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'confidence': confidence,
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'box': box})
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output_image = None
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if draw_output:
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output_image = rgb_image.copy()
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for detection_dict in results:
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self.draw_detection(output_image, detection_dict)
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return results, output_image
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def draw_detection(self, image, detection_dict):
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font_scale = 0.75
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line_color = [0, 0, 0]
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line_width = 1
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font = cv2.FONT_HERSHEY_PLAIN
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class_label = detection_dict['label']
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confidence = detection_dict['confidence']
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box = detection_dict['box']
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x_min, y_min, x_max, y_max = box
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output_string = '{0}, {1:.2f}'.format(class_label, confidence)
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color = (0, 0, 255)
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rectangle_line_thickness = 2 #1
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cv2.rectangle(image, (x_min, y_min), (x_max, y_max), color, rectangle_line_thickness)
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# see the following page for a helpful reference
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# https://stackoverflow.com/questions/51285616/opencvs-gettextsize-and-puttext-return-wrong-size-and-chop-letters-with-low
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label_background_border = 2
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(label_width, label_height), baseline = cv2.getTextSize(output_string, font, font_scale, line_width)
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label_x_min = x_min
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label_y_min = y_min
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label_x_max = x_min + (label_width + (2 * label_background_border))
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label_y_max = y_min + (label_height + baseline + (2 * label_background_border))
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text_x = label_x_min + label_background_border
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text_y = (label_y_min + label_height) + label_background_border
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cv2.rectangle(image, (label_x_min, label_y_min), (label_x_max, label_y_max), (255, 255, 255), cv2.FILLED)
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cv2.putText(image, output_string, (text_x, text_y), font, font_scale, line_color, line_width, cv2.LINE_AA)
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