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detector.py
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detector.py
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from __future__ import division
import os
import cv2
import numpy as np
import pickle
import time
from keras_frcnn import config
from keras_frcnn.config import Config
from keras import backend as K
from keras.layers import Input
from keras.models import Model
from keras_frcnn import roi_helpers
import argparse
import os
import keras_frcnn.resnet as nn
from keras_frcnn.visualize import draw_boxes_and_label_on_image_cv2
from utils.process import *
class FasterRCNNDetector(object):
def __init__(self, model_path):
self.model_path = model_path
if os.path.exists('config.pickle'):
with open('config.pickle', 'rb') as f:
self.cfg = pickle.load(f)
else:
self.cfg = Config()
print('Not found previous train and saved config.pickle file. may lose class map info.')
self._init_model()
def _init_model(self):
self.cfg.use_horizontal_flips = False
self.cfg.use_vertical_flips = False
self.cfg.rot_90 = False
class_mapping = self.cfg.class_mapping
if 'bg' not in class_mapping:
class_mapping['bg'] = len(class_mapping)
self.class_mapping = {v: k for k, v in class_mapping.items()}
input_shape_img = (None, None, 3)
input_shape_features = (None, None, 1024)
img_input = Input(shape=input_shape_img)
roi_input = Input(shape=(self.cfg.num_rois, 4))
feature_map_input = Input(shape=input_shape_features)
shared_layers = nn.nn_base(img_input, trainable=False)
# define the RPN, built on the base layers
num_anchors = len(self.cfg.anchor_box_scales) * len(self.cfg.anchor_box_ratios)
rpn_layers = nn.rpn(shared_layers, num_anchors)
classifier = nn.classifier(feature_map_input, roi_input, self.cfg.num_rois, nb_classes=len(class_mapping),
trainable=True)
self.model_rpn = Model(img_input, rpn_layers)
model_classifier_only = Model([feature_map_input, roi_input], classifier)
self.model_classifier = Model([feature_map_input, roi_input], classifier)
model_path = self.cfg.model_path
print('Loading weights from {}'.format(model_path))
if not os.path.exists(model_path):
model_path = self.model_path
print('previous model path not found or not exist, using specific one: ', self.model_path)
self.model_rpn.load_weights(model_path, by_name=True)
self.model_classifier.load_weights(model_path, by_name=True)
self.model_rpn.compile(optimizer='sgd', loss='mse')
self.model_classifier.compile(optimizer='sgd', loss='mse')
def detect_on_image(self, img):
tic = time.time()
X, ratio = format_img(img, self.cfg)
if K.image_dim_ordering() == 'tf':
X = np.transpose(X, (0, 2, 3, 1))
# get the feature maps and output from the RPN
[Y1, Y2, F] = self.model_rpn.predict(X)
# this is result contains all boxes, which is [x1, y1, x2, y2]
result = roi_helpers.rpn_to_roi(Y1, Y2, self.cfg, K.image_dim_ordering(), overlap_thresh=0.7)
# convert from (x1,y1,x2,y2) to (x,y,w,h)
result[:, 2] -= result[:, 0]
result[:, 3] -= result[:, 1]
bbox_threshold = 0.8
# apply the spatial pyramid pooling to the proposed regions
boxes = dict()
for jk in range(result.shape[0] // self.cfg.num_rois + 1):
rois = np.expand_dims(result[self.cfg.num_rois * jk:self.cfg.num_rois * (jk + 1), :], axis=0)
if rois.shape[1] == 0:
break
if jk == result.shape[0] // self.cfg.num_rois:
# pad R
curr_shape = rois.shape
target_shape = (curr_shape[0], self.cfg.num_rois, curr_shape[2])
rois_padded = np.zeros(target_shape).astype(rois.dtype)
rois_padded[:, :curr_shape[1], :] = rois
rois_padded[0, curr_shape[1]:, :] = rois[0, 0, :]
rois = rois_padded
[p_cls, p_regr] = self.model_classifier_only.predict([F, rois])
for ii in range(p_cls.shape[1]):
if np.max(p_cls[0, ii, :]) < bbox_threshold or np.argmax(p_cls[0, ii, :]) == (p_cls.shape[2] - 1):
continue
cls_num = np.argmax(p_cls[0, ii, :])
if cls_num not in boxes.keys():
boxes[cls_num] = []
(x, y, w, h) = rois[0, ii, :]
try:
(tx, ty, tw, th) = p_regr[0, ii, 4 * cls_num:4 * (cls_num + 1)]
tx /= self.cfg.classifier_regr_std[0]
ty /= self.cfg.classifier_regr_std[1]
tw /= self.cfg.classifier_regr_std[2]
th /= self.cfg.classifier_regr_std[3]
x, y, w, h = roi_helpers.apply_regr(x, y, w, h, tx, ty, tw, th)
except Exception as e:
print(e)
pass
boxes[cls_num].append(
[self.cfg.rpn_stride * x, self.cfg.rpn_stride * y, self.cfg.rpn_stride * (x + w), self.cfg.rpn_stride * (y + h),
np.max(p_cls[0, ii, :])])
# add some nms to reduce many boxes
for cls_num, box in boxes.items():
boxes_nms = roi_helpers.non_max_suppression_fast(box, overlap_thresh=0.5)
boxes[cls_num] = boxes_nms
print(self.class_mapping[cls_num] + ":")
for b in boxes_nms:
b[0], b[1], b[2], b[3] = get_real_coordinates(ratio, b[0], b[1], b[2], b[3])
print('{} prob: {}'.format(b[0: 4], b[-1]))
img = draw_boxes_and_label_on_image_cv2(img, self.class_mapping, boxes)
print('Elapsed time = {}'.format(time.time() - tic))
cv2.imshow('image', img)
result_path = './results_images/{}.png'.format('result')
print('result saved into ', result_path)
cv2.imwrite(result_path, img)
cv2.waitKey(0)
def detect_on_video(self, v):
pass