PaddleOCR CHOOSE_PRE_INSTALLED_MODEL_KEY ENABLE_CUSTOM_SETTINGS_KEY MODEL_PATH_KEY LABEL_PATH_KEY IMAGE_PATH_KEY CPU_THREAD_NUM_KEY CPU_POWER_MODE_KEY DET_LONG_SIZE_KEY SCORE_THRESHOLD_KEY models/ch_PP-OCRv2 labels/ppocr_keys_v1.txt images/det_0.jpg 4 LITE_POWER_HIGH 960 0.1