Why CIFAR-10 images are not displayed properly using matplotlib?

Question

From the training set I took a image(\'img\') of size (3,32,32). I have used plt.imshow(img.T). The image is not clear. Now changes I have to make to image(\'img\') to make it m

Answer 1

I made a function to plot the RGB image from a row in the CIFAR10 dataset.The image will be blurry at best since the original size of the image is very small (32px X 32px).

def unpickle(file):
    with open(file, 'rb') as fo:
        dict1 = pickle.load(fo, encoding='bytes')
    return dict1

pd_tr = pd.DataFrame()
tr_y = pd.DataFrame()

for i in range(1,6):
    data = unpickle('data/data_batch_' + str(i))
    pd_tr = pd_tr.append(pd.DataFrame(data[b'data']))
    tr_y = tr_y.append(pd.DataFrame(data[b'labels']))
    pd_tr['labels'] = tr_y

tr_x = np.asarray(pd_tr.iloc[:, :3072])
tr_y = np.asarray(pd_tr['labels'])
ts_x = np.asarray(unpickle('data/test_batch')[b'data'])
ts_y = np.asarray(unpickle('data/test_batch')[b'labels'])    
labels = unpickle('data/batches.meta')[b'label_names']

def plot_CIFAR(ind):
    arr = tr_x[ind]
    sc_dpi = 157.35
    R = arr[0:1024].reshape(32,32)/255.0
    G = arr[1024:2048].reshape(32,32)/255.0
    B = arr[2048:].reshape(32,32)/255.0

    img = np.dstack((R,G,B))
    title = re.sub('[!@#$b]', '', str(labels[tr_y[ind]]))
    fig = plt.figure(figsize=(3,3))
    ax = fig.add_subplot(111)
    ax.imshow(img,interpolation='bicubic')
    ax.set_title('Category = '+ title,fontsize =15)

plot_CIFAR(4)