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+#!/usr/bin/env python
+"""Superscaler."""
+# https://learnopencv.com/super-resolution-in-opencv/
+# https://github.com/xinntao/ESRGAN
+# https://github.com/xinntao/Real-ESRGAN
+# https://github.com/xinntao/Real-ESRGAN-ncnn-vulkan
+
+# modls
+# https://github.com/Saafke/EDSR_Tensorflow/tree/master/models
+# https://github.com/fannymonori/TF-ESPCN/tree/master/export
+# https://github.com/Saafke/FSRCNN_Tensorflow/tree/master/models
+# https://github.com/fannymonori/TF-LapSRN/tree/master/export
+
+import cv2
+import time
+
+
+def edsr_superscaler(img):
+    """EDSR superscaler."""
+    sr = cv2.dnn_superres.DnnSuperResImpl_create()
+    path = "./models/EDSR_x4.pb"
+    sr.readModel(path)
+    sr.setModel("edsr", 4)
+    result = sr.upsample(img)
+    return result
+
+
+def espcn_superscaler(img):
+    """ESPCN superscaler."""
+    sr = cv2.dnn_superres.DnnSuperResImpl_create()
+    path = "./models/ESPCN_x3.pb"
+    sr.readModel(path)
+    sr.setModel("espcn", 3)
+    result = sr.upsample(img)
+    return result
+
+
+def fsrcnn_superscaler(img):
+    """FSRCNN superscaler"""
+    sr = cv2.dnn_superres.DnnSuperResImpl_create()
+    path = "./models/FSRCNN_x3.pb"
+    sr.readModel(path)
+    sr.setModel("fsrcnn", 3)
+    result = sr.upsample(img)
+    return result
+
+
+def lapsrn_superscaler(img):
+    """LapSRN superscaler"""
+    sr = cv2.dnn_superres.DnnSuperResImpl_create()
+    path = "./models/LapSRN_x8.pb"
+    sr.readModel(path)
+    sr.setModel("lapsrn", 8)
+    result = sr.upsample(img)
+    return result
+
+
+def main():
+    img = cv2.imread("./21-o.jpg")
+
+    time_begin = time.time()
+    edsr_super_img = edsr_superscaler(img)
+    cv2.imwrite("./edsr_super.jpg", edsr_super_img)
+    time_end = time.time()
+    print("time {}".format(time_end - time_begin))
+
+    time_begin = time.time()
+    espcn_super_img = espcn_superscaler(img)
+    cv2.imwrite("./espcn_super.jpg", espcn_super_img)
+    time_end = time.time()
+    print("time {}".format(time_end - time_begin))
+
+    time_begin = time.time()
+    fsrcnn_super_img = fsrcnn_superscaler(img)
+    cv2.imwrite("./fsrcnn_super.jpg", fsrcnn_super_img)
+    time_end = time.time()
+    print("time {}".format(time_end - time_begin))
+
+    time_begin = time.time()
+    lapsrn_super_img = lapsrn_superscaler(img)
+    cv2.imwrite("./lapsrn_super_img.jpg", lapsrn_super_img)
+    time_end = time.time()
+    print("time {}".format(time_end - time_begin))
+
+
+if __name__ == "__main__":
+    main()