TY - Front. Electr. Electron. Eng. A1 - Arto KAARNA, Wei LIU, Heikki K?LVI?INEN T1 - Development of color density concept with color difference formulas in respect to human vision system Y1 - 2011-06-05 JF - Frontiers of Electrical and Electronic Engineering JO - Front. Electr. Electron. Eng. SP - 381 EP - 387 VL - 6 IS - 2 UR - https://journal.hep.com.cn/fee N1 - 10.1007/s11460-011-0144-0 ER -