How to search for an object in an image using a fully convolutional neural network

Hello, I have a task of searching for an object using a fully convolutional neural network, using Keras, theano, in Python. Currently, the following network configuration is used:

def create_encoding_layers():    keel = 3    filter_size = 64    pad = 1    pool_size = 2    retu [        ZeroPadding2D(padding=(pad,pad)),        Convolution2D(filter_size, keel, keel, border_mode='valid'),        BatchNormalization(),        Activation('relu'),        MaxPooling2D(pool_size=(pool_size, pool_size)),        ZeroPadding2D(padding=(pad,pad)),