Keras Classification - Object Detection
the machine learning model you built and the task you are trying to achieve are not the same. the model tries to solve a classification task while your goal is to detect an object inside the image, which is an object detection task.
classification has a boolean question while detection quesion has more than two answers answers.
What can you do?
I can suggest you three possibilities to try:
1. use sliding window combined with your model
crop boxes of defined sizes (e.g. from 20X20 to 160X160) and use sliding window. for each window, try to predict the probability its a dog and finally take the maximum window you predicted on.
this will generate multiple candidates for the bounding box and you will choose the bounding box using the highest probability you got.
this might be slow as we need to predict on hundreds+ samples.
another option is to try implement RCNN (another link) or Faster-RCNN network on top of your network. These networks are basically reducing the number of bounding box windows candidates to use.
Update - computing sliding window example
the following code demonstrate how to do the sliding window algorithm. you can change the parameters.
import random
import numpy as np
WINDOW_SIZES = [i for i in range(20, 160, 20)]
def get_best_bounding_box(img, predict_fn, step=10, window_sizes=WINDOW_SIZES):
best_box = None
best_box_prob = -np.inf
# loop window sizes: 20x20, 30x30, 40x40...160x160
for win_size in window_sizes:
for top in range(0, img.shape[0] - win_size + 1, step):
for left in range(0, img.shape[1] - win_size + 1, step):
# compute the (top, left, bottom, right) of the bounding box
box = (top, left, top + win_size, left + win_size)
# crop the original image
cropped_img = img[box[0]:box[2], box[1]:box[3]]
# predict how likely this cropped image is dog and if higher
# than best save it
print('predicting for box %r' % (box, ))
box_prob = predict_fn(cropped_img)
if box_prob > best_box_prob:
best_box = box
best_box_prob = box_prob
return best_box
def predict_function(x):
# example of prediction function for simplicity, you
# should probably use `return model.predict(x)`
random.seed(x[0][0])
return random.random()
# dummy array of 256X256
img = np.arange(256 * 256).reshape((256, 256))
best_box = get_best_bounding_box(img, predict_function)
print('best bounding box %r' % (best_box, ))
example output:
predicting for box (0, 0, 20, 20)
predicting for box (0, 10, 20, 30)
predicting for box (0, 20, 20, 40)
...
predicting for box (110, 100, 250, 240)
predicting for box (110, 110, 250, 250)
best bounding box (140, 80, 160, 100)
2. train new network for object detection task
you can take a look at the pascal dataset (examples here) which contains 20 classes and two of them are cats and dogs.
the dataset contains the location of the objects as the Y target.
3. use existing network for this task
last but not least, you can reuse existing network or even do "knowledge transfer" (keras example here) for your specific task.
take a look at the following convnets-keras
lib.
so choose your best method to go and update us with the results.
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Powisss
Updated on October 11, 2022Comments
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Powisss over 1 year
I am working on a classification then object detection with Keras and Python. I have classified cats/dogs with 80%+ accuracy, Im ok with the current result for now. My question is how do I detect cat or dog from an input image? I'm completely confused. I want to use my own heights and not pretrained ones from internet.
Here is my code currently:
from keras.preprocessing.image import ImageDataGenerator from keras.models import Sequential from keras.layers import Convolution2D, MaxPooling2D from keras.layers import Activation, Dropout, Flatten, Dense import numpy as np import matplotlib.pyplot as plt import matplotlib from keras.preprocessing.image import ImageDataGenerator, array_to_img, img_to_array, load_img ######################################################################################################### #VALUES # dimensions of our images. img_width, img_height = 150, 150 train_data_dir = 'data/train' validation_data_dir = 'data/validation' nb_train_samples = 2000 #1000 cats/dogs nb_validation_samples = 800 #400cats/dogs nb_epoch = 50 ######################################################################################################### #MODEL model = Sequential() model.add(Convolution2D(32, 3, 3, input_shape=(3, img_width, img_height))) model.add(Activation('relu')) model.add(MaxPooling2D(pool_size=(2, 2))) model.add(Convolution2D(32, 3, 3)) model.add(Activation('relu')) model.add(MaxPooling2D(pool_size=(2, 2))) model.add(Convolution2D(64, 3, 3)) model.add(Activation('relu')) model.add(MaxPooling2D(pool_size=(2, 2))) model.add(Flatten()) model.add(Dense(64)) model.add(Activation('relu')) model.add(Dropout(0.5)) model.add(Dense(1)) model.add(Activation('sigmoid')) model.compile(loss='binary_crossentropy', optimizer='rmsprop', metrics=['accuracy']) # this is the augmentation configuration we will use for training train_datagen = ImageDataGenerator( rescale=1./255, shear_range=0.2, zoom_range=0.2, horizontal_flip=True) ########################################################################################################## #TEST AUGMENTATION img = load_img('data/train/cats/cat.0.jpg') # this is a PIL image x = img_to_array(img) # this is a Numpy array with shape (3, 150, 150) x = x.reshape((1,) + x.shape) # this is a Numpy array with shape (1, 3, 150, 150) # the .flow() command below generates batches of randomly transformed images # and saves the results to the `preview/` directory i = 0 for batch in train_datagen.flow(x, batch_size=1, save_to_dir='data/TEST AUGMENTATION', save_prefix='cat', save_format='jpeg'): i += 1 if i > 20: break # otherwise the generator would loop indefinitely ########################################################################################################## # this is the augmentation configuration we will use for testing: # only rescaling test_datagen = ImageDataGenerator(rescale=1./255) #PREPARE TRAINING DATA train_generator = train_datagen.flow_from_directory( train_data_dir, #data/train target_size=(img_width, img_height), #RESIZE to 150/150 batch_size=32, class_mode='binary') #since we are using binarycrosentropy need binary labels #PREPARE VALIDATION DATA validation_generator = test_datagen.flow_from_directory( validation_data_dir, #data/validation target_size=(img_width, img_height), #RESIZE 150/150 batch_size=32, class_mode='binary') #START model.fit history =model.fit_generator( train_generator, #train data samples_per_epoch=nb_train_samples, nb_epoch=nb_epoch, validation_data=validation_generator, #validation data nb_val_samples=nb_validation_samples) model.save_weights('savedweights.h5') # list all data in history print(history.history.keys()) #ACC VS VAL_ACC plt.plot(history.history['acc']) plt.plot(history.history['val_acc']) plt.title('model accuracy ACC VS VAL_ACC') plt.ylabel('accuracy') plt.xlabel('epoch') plt.legend(['train', 'test'], loc='upper left') plt.show() # summarize history for loss #LOSS VS VAL_LOSS plt.plot(history.history['loss']) plt.plot(history.history['val_loss']) plt.title('model loss LOSS vs VAL_LOSS') plt.ylabel('loss') plt.xlabel('epoch') plt.legend(['train', 'test'], loc='upper left') plt.show() model.load_weights('first_try.h5')
So now since i classified cat and dog, how and what do I need to do to input an image and go through it to find cat or a dog in it with a bounding box? I'm completely new to this nd not even sure if I'm tackling this in a correct way? Thank you.
UPDATE Hi, Sorry to post results so late, was unable to work on this for few days. I am importing an image and reshaping it to 1,3,150,150 shape as 150,150 shape brings error:
Exception: Error when checking : expected convolution2d_input_1 to have 4 dimensions, but got array with shape (150L, 150L)
Importing image:
#load test image img=load_img('data/prediction/cat.155.jpg') #reshape to 1,3,150,150 img = np.arange(1* 150 * 150).reshape((1,3,150, 150)) #check shape print(img.shape)
Then I have changed def predict_function(x) to:
def predict_function(x): # example of prediction function for simplicity, you # should probably use `return model.predict(x)` # random.seed(x[0][0]) # return random.random() return model.predict(img)
Now when I run:
best_box = get_best_bounding_box(img, predict_function) print('best bounding box %r' % (best_box, ))
I get output as best bounding box: None
So I ran just:
model.predict(img)
And get the following out:
model.predict(img) Out[54]: array([[ 0.]], dtype=float32)
So it is not checking at all if its a cat or a dog... Any ideas?
NOTE: when def predict)function(x) is using:
random.seed(x[0][0]) return random.random()
I do get the output as , it check boxes and gives the best one.