Colors and emotions are two terms that stand for a long time in world history, especially for human beings. Even humankind made a relationship between some acts and colors. In the following chapters, this will be explained as detailed.
The photoplethysmography (PPG) which means heart-rate pulsation is generally measured on a finger or an ear using contact sensors. The recent several studies using web-cam to measure PPG have been introduced under the desktop or mobile computing environment including service