diff --git a/api.py b/api.py
index bd08984..204b390 100644
--- a/api.py
+++ b/api.py
@@ -6,15 +6,13 @@
 
 from predictor import PosPrediction
 
-
 class PRN:
     ''' Joint 3D Face Reconstruction and Dense Alignment with Position Map Regression Network
     Args:
         is_dlib(bool, optional): If true, dlib is used for detecting faces.
-        is_opencv(bool, optional): If true, opencv is used for extracting texture.
         prefix(str, optional): If run at another folder, the absolute path is needed to load the data.
     '''
-    def __init__(self, is_dlib = False, is_opencv = False, prefix = '.'):
+    def __init__(self, is_dlib = False, prefix = '.'):
 
         # resolution of input and output image size.
         self.resolution_inp = 256
@@ -27,9 +25,6 @@ def __init__(self, is_dlib = False, is_opencv = False, prefix = '.'):
             self.face_detector = dlib.cnn_face_detection_model_v1(
                     detector_path)
 
-        if is_opencv:
-            import cv2
-
         #---- load PRN 
         self.pos_predictor = PosPrediction(self.resolution_inp, self.resolution_op)
         prn_path = os.path.join(prefix, 'Data/net-data/256_256_resfcn256_weight')
@@ -42,6 +37,16 @@ def __init__(self, is_dlib = False, is_opencv = False, prefix = '.'):
         self.uv_kpt_ind = np.loadtxt(prefix + '/Data/uv-data/uv_kpt_ind.txt').astype(np.int32) # 2 x 68 get kpt
         self.face_ind = np.loadtxt(prefix + '/Data/uv-data/face_ind.txt').astype(np.int32) # get valid vertices in the pos map
         self.triangles = np.loadtxt(prefix + '/Data/uv-data/triangles.txt').astype(np.int32) # ntri x 3
+        self.uv_coords = self.generate_uv_coords()        
+
+    def generate_uv_coords(self):
+        resolution = self.resolution_op
+        uv_coords = np.meshgrid(range(resolution),range(resolution))
+        uv_coords = np.transpose(np.array(uv_coords), [1,2,0])
+        uv_coords = np.reshape(uv_coords, [resolution**2, -1]);
+        uv_coords = uv_coords[self.face_ind, :]
+        uv_coords = np.hstack((uv_coords[:,:2], np.zeros([uv_coords.shape[0], 1])))
+        return uv_coords
 
     def dlib_detect(self, image):
         return self.face_detector(image, 1)
@@ -147,18 +152,6 @@ def get_vertices(self, pos):
 
         return vertices
 
-    def get_texture(self, image, pos):
-        ''' extract uv texture from image. opencv is needed here.
-        Args:
-            image: input image.
-            pos: the 3D position map. shape = (256, 256, 3).
-        Returns:
-            texture: the corresponding colors of vertices. shape = (num of points, 3). n is 45128 here.
-        '''
-        texture = cv2.remap(image, pos[:,:,:2].astype(np.float32), None, interpolation=cv2.INTER_NEAREST, borderMode=cv2.BORDER_CONSTANT,borderValue=(0))
-        return texture
-
-
     def get_colors(self, image, vertices):
         '''
         Args: