        max_x = int(numpy.round(-270 + self.size_image[1]/2, 0))
        min_x = int(numpy.round(-390 + self.size_image[1]/2, 0))
        min_y = int(numpy.round(-820 + self.size_image[0]/2, 0))
        max_y = int(numpy.round(-890 + self.size_image[0]/2, 0))
        if min_x < 0:
            min_x = 0
        if max_x > self.size_image[0] - 1:
            max_x = self.size_image[0] - 1
        if min_y > self.size_image[1] - 1:
            min_y = self.size_image[1] - 1