[1세대]아날로그(카메라+모니터),영상분배기(VDA;채널증폭)+VCR+Time-lap(녹화시간연장)기술 [2세대]DVR(디지털저장장치;PC-based/Stand-alone)+아날로그카메라+PC모니터 [3세대]IP-surveillance(감시망;디지털NW카메라)+비디오서버(압축전송)+NVR+DAS/NAS/SAN [4세대]ISC(지능형영상보안시스템)+영상분석SW(객체인식,패턴인식)+영상보안(자동감지/경고),190도화각/초광각,고비율,WiFi,침입자인식,SMS/메일발송,원격제어,PC APP-API제공 VDA(Video Distribution amp) ISC(Intelligence Security Camera) [세대별특징]아날로그->디지털저장장치->IP/NW기반 저장장치->지능형영상보안(객체인식/자동화)