improve quality of images (#2645)

* improve quality of images

* update url for install doc

docs/INSTALL.md

@@ -20,7 +20,7 @@ For general information about PaddleDetection, please see [README.md](../README.
 
 ## PaddlePaddle
 
-Running PaddleDetection requires PaddlePaddle Fluid v.1.5 and later. please follow the instructions in [installation document](http://www.paddlepaddle.org/documentation/docs/en/1.4/beginners_guide/install/index_en.html).
+Running PaddleDetection requires PaddlePaddle Fluid v.1.5 and later. please follow the instructions in [installation document](http://www.paddlepaddle.org.cn/).
 
 Please make sure your PaddlePaddle installation was successful and the version
 of your PaddlePaddle is not lower than required. Verify with the following commands.

tools/infer.py

@@ -171,7 +171,7 @@ def main():
                                       mask_results, is_bbox_normalized)
             save_name = get_save_image_name(FLAGS.output_dir, image_path)
             logger.info("Detection bbox results save in {}".format(save_name))
-            image.save(save_name)
+            image.save(save_name, quality=95)
 
 
 if __name__ == '__main__':