When　a　hazed　image　is　processed　by　dark　prior　haze　removal　method,　it　should　take　the　elimination　of　white　halo　on　the　depth-edge　and　the　reduction　of　time　consuming　for　modifying　the　transmittance　into　account.　In　order　to　eliminate　the　white　halo　on　the　depth-edge　and　to　reduce　the　time　consuming　for　modifying　the　transmittance,　this　article　fully　analyzes　the　advantages　and　disadvantages　of　minimum　filtering　and　guide　filtering　in　modifying　transmittance,　respectively.　A　new　method　in　combination　with　the　minimum　filtering　and　the　guide　filtering　is　adopted　to　modify　the　transmittance,　by　which　their　advantages　are　taken　and　the　inadequacies　are　made　up.　As　compared　with　the　traditional　method,　it　not　only　eliminates　the　white　halo　but　also　reduces　the　processing　time　significantly.　In　addition,　this　paper　improves　the　poor　result　of　traditional　dark　prior　method　with　a　sky　area　in　the　hazy　image.　According　to　the　bright-white　features　of　the　pixels　in　the　sky　area,　the　pixels　with　color　values　similar　to　that　of　the　airlight　are　viewed　as　the　sky　area　pixels.　Then　these　pixels　are　processed　to　maintain　their　original　color　values　and　to　eliminate　the　color　distortion　and　jump　existing　in　the　sky　area　effectively.　Thus,　the　visual　effect　of　whole　defogging　restored　image　could　be　improved.　©,　2015,　Chinese　Academy　of　Sciences.　All　right　reserved.