Convert .mts file into image files (jpgs)

I finally found 2 ways for this.

1. Using avisynth + virtualdub
Following poisondeathray's suggestion, Install the following:

1. haali media splitter
2. ffdshow
3. avisynth
4. virtualdub

Suppose our purpose is to convert "test.mts". We first create a .txt file and write the following command:
  DirectShowSource("test.mts")
Then, rename the extension from .txt to .avs to refer to avisynth. Then, open the .avs file in virtualdub and choose file->export->image sequence.

http://forum.videohelp.com/threads/306447-Converting-AVCHD-to-jpeg-s

The other solution is using Blender.