Create utils.py

utils.py

@@ -0,0 +1,68 @@
+def to_bin(data):
+    """Convert `data` to binary format as string"""
+    if isinstance(data, str):
+        return ''.join([ format(ord(i), "08b") for i in data ])
+    elif isinstance(data, bytes):
+        return ''.join([ format(i, "08b") for i in data ])
+    elif isinstance(data, np.ndarray):
+        return [ format(i, "08b") for i in data ]
+    elif isinstance(data, int) or isinstance(data, np.uint8):
+        return format(data, "08b")
+    else:
+        raise TypeError("Type not supported.")
+def decode(image_name,txt=None):
+    msg=""
+    BGRimage = cv2.imread(image_name)
+    image = cv2.cvtColor(BGRimage, cv2.COLOR_BGR2RGB)   
+    binary_data = ""
+    for row in image:
+        for pixel in row:
+            r, g, b = to_bin(pixel)
+            binary_data += r[-1]
+            binary_data += g[-1]
+            binary_data += b[-1]
+    all_bytes = [ binary_data[i: i+8] for i in range(0, len(binary_data), 8) ]
+    decoded_data = ""
+    for byte in all_bytes:
+        decoded_data += chr(int(byte, 2))
+        if decoded_data[-5:] == "=====":
+            break
+    this = decoded_data[:-5].split("#####",1)[0]
+    this = eval(this)
+    enc_in=this
+    return this,msg
+
+def encode(image_name, secret_data,txt=None):
+    msg=""
+    BGRimage = cv2.imread(image_name)
+    image = cv2.cvtColor(BGRimage, cv2.COLOR_BGR2RGB)    
+    n_bytes = image.shape[0] * image.shape[1] * 3 // 8
+    print("[*] Maximum bytes to encode:", n_bytes)
+    secret_data1=secret_data
+    while True:
+        if len(secret_data1)+5 < (n_bytes):
+            secret_data1 = f'{secret_data1}#####'
+        elif len(secret_data1)+5 >= (n_bytes):
+            break    
+    secret_data = secret_data1    
+    if len(secret_data) > n_bytes:
+        return image_name,msg
+    secret_data += "====="
+    data_index = 0
+    binary_secret_data = to_bin(secret_data)
+    data_len = len(binary_secret_data)
+    for row in image:
+        for pixel in row:
+            r, g, b = to_bin(pixel)
+            if data_index < data_len:
+                pixel[0] = int(r[:-1] + binary_secret_data[data_index], 2)
+                data_index += 1
+            if data_index < data_len:
+                pixel[1] = int(g[:-1] + binary_secret_data[data_index], 2)
+                data_index += 1
+            if data_index < data_len:
+                pixel[2] = int(b[:-1] + binary_secret_data[data_index], 2)
+                data_index += 1
+            if data_index >= data_len:
+                break
+    return image,msg