Image signal processors combining with CMOS image sensors including enhanced sensitivity and high resolution functions, provide high quality HD images through low current, low heat and one chip solution in the security/surveillance market. It provides high image quality specialized in surveillance not only in indoors, but also in worst outdoor conditions. Also, it supports EX-SDI and HD-analog outputs for efficient image transmission based on coaxial cable. In addition, it supports not only one-cable solution for user convenience, but also PoC(Power over Coax), Ucc(Upstream Communication Channel), enhancing convenience and utility of installation.