解决方法来自GitHub：https://github.com/open-mmlab/mmdetection/issues/1405

The code below can show and save image with result.
import mmcv
import cv2
from mmcv.runner import load_checkpoint
from mmdet.models import build_detector
from mmdet.apis import init_detector, inference_detector, show_result_pyplot
import matplotlib.pyplot as plt

config_file = '/home/en_ro/mmdata/mmdetection/configs/balloon/faster_rcnn_r50_fpn_1x_voc_cat0602.py'
checkpoint_file = '/home/en_ro/mmdetection/work_dirs/faster_rcnn_r50_fpn_1x_voc_cat0602/epoch_100.pth'

model = init_detector(config_file,checkpoint_file)

img = '017-01_0034_o_S017-1_0035.JPG'
result = inference_detector(model,img)

# 这句用来显示的，但是Linux弹出不来的情况下， 就看不到结果，只能保存了看
show_result_pyplot(model, img, result, score_thr=0.6)# show the image with result

# 最主要就是下面这句
model.show_result(img, result, out_file='0617.jpg')# save image with result