test_frcnn.py

from __future__ import division
import os
import cv2
import numpy as np
import sys
import pickle
import pandas as pd
from optparse import OptionParser
import time
from keras_frcnn import config
from keras import backend as K
from keras.layers import Input
from keras.models import Model
from keras_frcnn import roi_helpers
from google.colab.patches import cv2_imshow

sys.setrecursionlimit(40000)

parser = OptionParser()

parser.add_option("-p", "--path", dest="test_path", help="Path to test data.")
parser.add_option("-n", "--num_rois", type="int", dest="num_rois",
				help="Number of ROIs per iteration. Higher means more memory use.", default=32)
parser.add_option("--config_filename", dest="config_filename", help=
				"Location to read the metadata related to the training (generated when training).",
				default="config.pickle")
parser.add_option("--network", dest="network", help="Base network to use. Supports vgg or resnet50.", default='resnet50')

(options, args) = parser.parse_args()

if not options.test_path:   # if filename is not given
	parser.error('Error: path to test data must be specified. Pass --path to command line')


config_output_filename = options.config_filename

with open(config_output_filename, 'rb') as f_in:
	C = pickle.load(f_in)

if C.network == 'resnet50':
	import keras_frcnn.resnet as nn
elif C.network == 'vgg':
	import keras_frcnn.vgg as nn

# turn off any data augmentation at test time
C.use_horizontal_flips = False
C.use_vertical_flips = False
C.rot_90 = False

img_path = options.test_path

def format_img_size(img, C):
	""" formats the image size based on config """
	img_min_side = float(C.im_size)
	(height,width,_) = img.shape
		
	if width <= height:
		ratio = img_min_side/width
		new_height = int(ratio * height)
		new_width = int(img_min_side)
	else:
		ratio = img_min_side/height
		new_width = int(ratio * width)
		new_height = int(img_min_side)
	img = cv2.resize(img, (new_width, new_height), interpolation=cv2.INTER_CUBIC)
	return img, ratio	

def format_img_channels(img, C):
	""" formats the image channels based on config """
	img = img[:, :, (2, 1, 0)]
	img = img.astype(np.float32)
	img[:, :, 0] -= C.img_channel_mean[0]
	img[:, :, 1] -= C.img_channel_mean[1]
	img[:, :, 2] -= C.img_channel_mean[2]
	img /= C.img_scaling_factor
	img = np.transpose(img, (2, 0, 1))
	img = np.expand_dims(img, axis=0)
	return img

def format_img(img, C):
	""" formats an image for model prediction based on config """
	img, ratio = format_img_size(img, C)
	img = format_img_channels(img, C)
	return img, ratio

# Method to transform the coordinates of the bounding box to its original size
def get_real_coordinates(ratio, x1, y1, x2, y2):

	real_x1 = int(round(x1 // ratio))
	real_y1 = int(round(y1 // ratio))
	real_x2 = int(round(x2 // ratio))
	real_y2 = int(round(y2 // ratio))

	return (real_x1, real_y1, real_x2 ,real_y2)

class_mapping = C.class_mapping

if 'bg' not in class_mapping:
	class_mapping['bg'] = len(class_mapping)

class_mapping = {v: k for k, v in class_mapping.items()}
print(class_mapping)
class_to_color = {class_mapping[v]: np.random.randint(0, 255, 3) for v in class_mapping}
C.num_rois = int(options.num_rois)

if C.network == 'resnet50':
	num_features = 1024
elif C.network == 'vgg':
	num_features = 512

if K.image_dim_ordering() == 'th':
	input_shape_img = (3, None, None)
	input_shape_features = (num_features, None, None)
else:
	input_shape_img = (None, None, 3)
	input_shape_features = (None, None, num_features)


img_input = Input(shape=input_shape_img)
roi_input = Input(shape=(C.num_rois, 4))
feature_map_input = Input(shape=input_shape_features)

# define the base network (resnet here, can be VGG, Inception, etc)
shared_layers = nn.nn_base(img_input, trainable=True)

# define the RPN, built on the base layers
num_anchors = len(C.anchor_box_scales) * len(C.anchor_box_ratios)
rpn_layers = nn.rpn(shared_layers, num_anchors)

classifier = nn.classifier(feature_map_input, roi_input, C.num_rois, nb_classes=len(class_mapping), trainable=True)

model_rpn = Model(img_input, rpn_layers)
model_classifier_only = Model([feature_map_input, roi_input], classifier)

model_classifier = Model([feature_map_input, roi_input], classifier)

print('Loading weights from {}'.format(C.model_path))
model_rpn.load_weights(C.model_path, by_name=True)
model_classifier.load_weights(C.model_path, by_name=True)

model_rpn.compile(optimizer='sgd', loss='mse')
model_classifier.compile(optimizer='sgd', loss='mse')

all_imgs = []

classes = {}

bbox_threshold = 0.8

visualise = True

for idx, img_name in enumerate(sorted(os.listdir(img_path))):
  if not img_name.lower().endswith(('.bmp', '.jpeg', '.jpg', '.png', '.tif', '.tiff')):
    continue
  print(img_name)
  det_res = pd.DataFrame(columns = ['c1', 'c2', 'c3', 'c4', 'c5', 'c6'])
  i=0
  st = time.time()
  filepath = os.path.join(img_path,img_name)

  img = cv2.imread(filepath)

  X, ratio = format_img(img, C)

  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] = model_rpn.predict(X)


  R = roi_helpers.rpn_to_roi(Y1, Y2, C, K.image_dim_ordering(), overlap_thresh=0.7)

  # convert from (x1,y1,x2,y2) to (x,y,w,h)
  R[:, 2] -= R[:, 0]
  R[:, 3] -= R[:, 1]

  # apply the spatial pyramid pooling to the proposed regions
  bboxes = {}
  probs = {}

  for jk in range(R.shape[0]//C.num_rois + 1):
    ROIs = np.expand_dims(R[C.num_rois*jk:C.num_rois*(jk+1), :], axis=0)
    if ROIs.shape[1] == 0:
      break

    if jk == R.shape[0]//C.num_rois:
      #pad R
      curr_shape = ROIs.shape
      target_shape = (curr_shape[0],C.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] = 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_name = class_mapping[np.argmax(P_cls[0, ii, :])]

      if cls_name not in bboxes:
        bboxes[cls_name] = []
        probs[cls_name] = []

      (x, y, w, h) = ROIs[0, ii, :]

      cls_num = np.argmax(P_cls[0, ii, :])
      try:
        (tx, ty, tw, th) = P_regr[0, ii, 4*cls_num:4*(cls_num+1)]
        tx /= C.classifier_regr_std[0]
        ty /= C.classifier_regr_std[1]
        tw /= C.classifier_regr_std[2]
        th /= C.classifier_regr_std[3]
        x, y, w, h = roi_helpers.apply_regr(x, y, w, h, tx, ty, tw, th)
      except:
        pass
      bboxes[cls_name].append([C.rpn_stride*x, C.rpn_stride*y, C.rpn_stride*(x+w), C.rpn_stride*(y+h)])
      probs[cls_name].append(np.max(P_cls[0, ii, :]))

  all_dets = []

  for key in bboxes:
    bbox = np.array(bboxes[key])

    new_boxes, new_probs = roi_helpers.non_max_suppression_fast(bbox, np.array(probs[key]), overlap_thresh=0.5)
    for jk in range(new_boxes.shape[0]):
      (x1, y1, x2, y2) = new_boxes[jk,:]

      (real_x1, real_y1, real_x2, real_y2) = get_real_coordinates(ratio, x1, y1, x2, y2)
      row = [key, new_probs[jk], real_x1, real_y1, real_x2, real_y2]
      det_res.loc[i] = row
      i = i+1

      cv2.rectangle(img,(real_x1, real_y1), (real_x2, real_y2), (int(class_to_color[key][0]), int(class_to_color[key][1]), int(class_to_color[key][2])),2)

      textLabel = '{}: {}'.format(key,int(100*new_probs[jk]))
      all_dets.append((key,100*new_probs[jk]))

      (retval,baseLine) = cv2.getTextSize(textLabel,cv2.FONT_HERSHEY_COMPLEX,1,1)
      textOrg = (real_x1, real_y1-0)

      cv2.rectangle(img, (textOrg[0] - 5, textOrg[1]+baseLine - 5), (textOrg[0]+retval[0] + 5, textOrg[1]-retval[1] - 5), (0, 0, 0), 2)
      cv2.rectangle(img, (textOrg[0] - 5,textOrg[1]+baseLine - 5), (textOrg[0]+retval[0] + 5, textOrg[1]-retval[1] - 5), (255, 255, 255), -1)
      cv2.putText(img, textLabel, textOrg, cv2.FONT_HERSHEY_DUPLEX, 1, (0, 0, 0), 1)

  print('Elapsed time = {}'.format(time.time() - st))
  print(all_dets)
  det_path = 'input/detection-results/' + img_name[:-3] + 'txt'
  det_res.to_csv(det_path, header=None, index=None, sep=' ')
  #cv2_imshow(img)
  #cv2.waitKey(0)
  cv2.imwrite('results_imgs/{}.png'.format(idx),img)