How to use the airtest.aircv.imwrite function in airtest

import traceback
            traceback.print_exc()
            return None

        # ensure the orientation is right
        if ensure_orientation and self.display_info["orientation"]:
            # minicap screenshots are different for various sdk_version
            if self.cap_method in (CAP_METHOD.MINICAP, CAP_METHOD.MINICAP_STREAM) and self.sdk_version <= 16:
                h, w = screen.shape[:2]  # cvshape是高度在前面!!!!
                if w < h:  # 当前是横屏，但是图片是竖的，则旋转，针对sdk<=16的机器
                    screen = aircv.rotate(screen, self.display_info["orientation"] * 90, clockwise=False)
            # adb 截图总是要根据orientation旋转，但是SDK版本大于等于25(Android7.1以后)无需额外旋转
            elif self.cap_method == CAP_METHOD.ADBCAP and self.sdk_version <= SDK_VERISON_NEW:
                screen = aircv.rotate(screen, self.display_info["orientation"] * 90, clockwise=False)
        if filename:
            aircv.imwrite(filename, screen)
        return screen