Fixed the names of methods

modules/reg/samples/reg_shift.py

@@ -7,12 +7,12 @@ import sys
 img1 = cv.imread(sys.argv[1])
 img1 = img1.astype(np.float32)
 shift = np.array([5., 5.])
-mapTest = cv.reg.MapShift(shift)
+mapTest = cv.reg_MapShift(shift)
 
 img2 = mapTest.warp(img1)
 
-mapper = cv.reg.MapperGradShift()
-mappPyr = cv.reg.MapperPyramid(mapper)
+mapper = cv.reg_MapperGradShift()
+mappPyr = cv.reg_MapperPyramid(mapper)
 
 resMap = mappPyr.calculate(img1, img2)
 mapShift = cv.reg.MapTypeCaster_toShift(resMap)