Hideki Noda Nobuteru Takao Michiharu Niimi Colorization in YCbCr Space and its Application to Improve Quality of JPEG Color Images. 385-388 2007 ICIP (4) http://dx.doi.org/10.1109/ICIP.2007.4380035 conf/icip/2007 db/conf/icip/icip2007-4.html#NodaTN07