generate_result.py

from __future__ import division
import os
import cv2
import numpy as np
import sys
import pickle
from optparse import OptionParser
import time
import tensorflow as tf
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

tf.logging.set_verbosity(tf.logging.ERROR)
os.environ['TF_CPP_MIN_LOG_LEVEL'] = '2'
K.set_learning_phase(0)
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='vgg')

(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)

accord_output_file = {'train':'train_test.txt', 'sofa':'sofa_test.txt', 'person':'person_test.txt',
                      'aeroplane':'aeroplane_test.txt', 'bus':'bus_test.txt', 'bicycle':'bicycle_test.txt',
                      'motorbike':'motorbike_test.txt', 'sheep':'sheep_test.txt', 'pottedplant':'pottedplant_test.txt',
                      'chair':'chair_test.txt', 'boat': 'boat_test.txt', 'diningtable':'diningtable_test.txt',
                      'horse':'horse_test.txt', 'bottle':'bottle_test.txt', 'cat':'cat_test.txt', 'car':'car_test.txt',
                      'bird':'bird_test.txt', 'dog': 'dog_test.txt', 'tvmonitor': 'tvmonitor_test.txt', 'cow':'cow_test.txt'}

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
    img_opt_name = img_name[:11]
    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, :]))

    for key in bboxes:
        with open(accord_output_file[key], 'a') as output_file:
            bbox = np.array(bboxes[key])
            new_boxes, new_probs = roi_helpers.non_max_suppression_fast(bbox, np.array(probs[key]), overlap_thresh=0.3)
            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)

                write_line = '{} {} {} {} {} {}\n'.format(img_opt_name, new_probs[jk], real_x1, real_y1, real_x2, real_y2)

                output_file.write(write_line)
        output_file.close()
    print('Elapsed time = {}'.format(time.time() - st))