With　the　ever　increasing　concern　of　privacy　security,　signal　processing　in　encrypted　domain　has　drawn　considerable　attentions.　Since　an　image　often　contain　much　personal　and　privacy　information,　it　is　also　necessary　to　process　images　in　a　privacy　protection　manner.　This　article　reviewed　the　recent　advances　in　secure　image　processing　in　a　variety　of　fields,　including　fundamental　image　processing　techniques　like　linear　transforms,　linear　filtering　and　feature　extraction　in　encrypted　domain　and　further　image　processing　applications　like　secure　image　data　hiding,　secure　image　retrieval　and　encrypted　image　compression.　The　future　research　trends　and　prospects　in　these　directions　were　also　presented　in　this　article.　©　2016,　Beijing　University　of　Technology.　All　right　reserved.