乍看似乎路慢慢, 選好方向並不遠. 圖像處理既沒戲, 今天改行不算晚.

Since you already knew 圖像處理, that means you are smart. You have super quality (much better than I do at that time) than most of us.

You already see there is a high demand for computer people (even in this bad time).

No body say you are a 圖像處理 baby when you were born, therefore, you do not have to tight on 圖像處理.

Item 3) seems to me a very good start point for you.
I will get 3) job, learn it, do it. And keep looking.

Thanks!