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+# Census Image Classfication
+
+### Methodology
+
+* Preprocess image : crop edges to alter frame to form
+* Resize image to (430, 250)
+* Training on a Convolutional Neural Netowrk model with a learning rate of 1e-6 owing to low dataset
+* Obtained accuracy = 95.6%
+
+### Image preprocessing
+
+Raw dataset image before preprocessing:
+
+![dataset image](https://github.com/salonirk11/census_image_classfication/blob/master/img_raw.jpg)
+
+
+The raw image was thresholded to ```binary``` colours. Thereafter, using a combination of ```findContours``` and ```boundingRect``` methods of ```OpenCV```, the form was brought into focus remvoing all the extra portions of the image.
+Following this, image was resized to (430, 250) to retain sufficient features and to maintain the proportion of the form.
+
+The image obtained afer preprocessing on the above image :
+
+![processed image](https://github.com/salonirk11/census_image_classfication/blob/master/img_proc.jpg)
+
+
+### Training
+
+The processed dataset was trained on a convolutional neural model. ```BatchNormalisation```, ```MaxPooling``` were used in this model with ```relu``` as activation.
+
+
+To run the model use the following command:
+```
+python train.py <path of directory with images> <path of csv file>
+```
+
+For example:
+```
+python train.py images/freecen data/gold/combined_classifications_20180227.csv
+```
+
+### Optimization
+
+Following is the learning curve for a learing rate of 1e-6
+
+![learning_rate](https://github.com/salonirk11/census_image_classfication/blob/master/Figure_1.png)
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diff --git a/classification/pre_process.py b/classification/pre_process.py
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+import cv2
+from matplotlib import pyplot as plt
+import csv
+import os
+import numpy as np
+from tqdm import tqdm
+
+def proc(img):
+    img=cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
+    ret,img = cv2.threshold(img,200,255,cv2.THRESH_BINARY)
+    (_,cnts, _) = cv2.findContours(img.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
+    x_, y_, w_, h_ = 0, 0, 0, 0
+    for c in cnts:
+        x,y,w,h = cv2.boundingRect(c)
+        if w>500 and h>500 and w*h > w_*h_:
+            w_=w
+            h_=h
+            x_=x
+            y_=y
+    new_img = img[y_:y_+h_,x_:x_+w_]
+    new_img = cv2.cvtColor(new_img, cv2.COLOR_GRAY2BGR)
+    img = cv2.resize(new_img,(430,250))
+    img=np.array(img)
+    return img
+
+
+def read_im(path):
+    img = cv2.imread(path)
+    img = proc(img)
+    return img
+
+def train_data(im_dir, src_file):
+    img_list= []
+    labels_list= []
+    with open(src_file, 'r') as f:
+        reader = csv.reader(f)
+        for line in tqdm(reader):
+            img_list.append(read_im(os.path.join(im_dir,line[0])))
+            labels_list.append(line[1])
+        img_list=np.array(img_list)
+    return img_list, labels_list
diff --git a/classification/train.py b/classification/train.py
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+import pre_process
+import cv2
+import sys
+import numpy as np
+from matplotlib import pyplot as plt
+
+import keras
+from keras.models import Model
+from keras.layers import Input
+from keras.layers import Dense, Dropout, Flatten, Activation
+from keras.layers import Conv2D, MaxPooling2D, BatchNormalization
+from keras.preprocessing.image import ImageDataGenerator
+from keras.losses import categorical_crossentropy
+from keras.optimizers import Adam
+
+def plot_rate(history):
+    plt.subplot(211)
+    plt.plot(history.history['acc'])
+    plt.plot(history.history['val_acc'])
+    plt.title('model accuracy')
+    plt.ylabel('accuracy')
+    plt.xlabel('epoch')
+    plt.legend(['train', 'test'], loc='upper left')
+
+    plt.subplot(212)
+    plt.plot(history.history['loss'])
+    plt.plot(history.history['val_loss'])
+    plt.title('model loss')
+    plt.ylabel('loss')
+    plt.xlabel('epoch')
+    plt.legend(['train', 'test'], loc='upper left')
+
+    plt.show()
+
+
+def getSimpleCNN(input_shape, num_classes):
+    inputs = Input(shape=input_shape)
+    x = Conv2D(64, (3, 3), activation='relu')(inputs)
+    x = BatchNormalization()(x)
+    x = MaxPooling2D(pool_size=(2, 2)) (x)
+    x = Conv2D(32, (3, 3), activation='relu')(x)
+    x = BatchNormalization()(x)
+    x = MaxPooling2D(pool_size=(2, 2)) (x)
+    x = Conv2D(16, (3, 3), activation='relu')(x)
+    x = BatchNormalization()(x)
+    x = MaxPooling2D(pool_size=(2, 2)) (x)
+    x = Dropout(0.25)(x)
+    x = Flatten()(x)
+    x = Dense(64)(x)
+    x = BatchNormalization()(x)
+    x = Activation('relu')(x)
+    x = Dropout(0.5)(x)
+    out = Dense(num_classes, activation='softmax')(x)
+    model = Model(inputs, out)
+    model.compile(loss=categorical_crossentropy,
+                  optimizer=Adam(lr=1e-4),
+                  metrics=['accuracy'])
+    return model
+
+
+if __name__=="__main__":
+    x_train, y_train = pre_process.train_data(sys.argv[1], sys.argv[2])
+    labels_set = list(set(y_train))
+    labels_dict = {labels_set[i]:i for i in range(len(labels_set))}
+
+    x_train = x_train.reshape(x_train.shape[0], 430, 250, 3)
+    input_shape = (430,250,3)
+    num_classes = len(labels_dict.keys())
+
+    model = getSimpleCNN(input_shape, num_classes)
+    y_train = np.array([labels_dict[x] for x in y_train])
+    y_train = keras.utils.to_categorical(y_train, num_classes)
+
+    batch_size = 4
+    epochs = 18
+    history = model.fit(
+                x_train, y_train,
+                batch_size=batch_size,
+                epochs=epochs,
+                validation_split=0.2
+            )
+    plot_rate(history)