Hence, a system is needed to interpret and summarize lifelog data to make the summaries useful as medical records.

Lifelog data, however, are too raw and their size is too huge thus, it is difficult to use them as medical records. Since the latest smartphones enclose a number of useful sensors, such as accelerometers, global positioning system (GPS), or gyroscopes, the signals detected by the sensors can be exploited as lifelog data to measure the activities of the user and encompass the contextual information regarding the user. Recently, smartphones have become so pervasive and popular that a large number of people hold the new devices almost all the time. These systems, however, require another device in which the sensors are embedded, and this may be uncomfortable or inconvenient for users. Blood pressure and heart rate signals, measured by ambulatory blood pressure sensors, are considered as lifelogs and sent to mobile devices to detect any unexpected status. built a mobile personal health application for ambulatory blood pressure monitoring, called the ARV-mobile. presented the Intelligent Mobile Health Monitoring System (IMHMS), which considers the biomedical and environmental data of patients as lifelogs and sends feedback via mobile devices. presented a human activity monitoring system that identifies human activities, lifelogging with four microelectromechanical systems sensors every day. Healthcare systems for various purposes have exploited lifelog data measured by sensors. There is a naïve approach of having users record every activity by themselves or with assistance, but this is essentially infeasible due to the limitations of time and resources.

However, it is very difficult to monitor users' activities. The records can be used for chronic disease management, rehabilitation systems, disease prevention, and as personal indicators of health status. In particular, records that indicate the everyday activity performed by people are very valuable resources for identifying their health status.

To make diagnoses personal, it is essential to obtain individual-related data or contextual information regarding the person such information considered together is called a lifelog. Personalized diagnostics are important for modern medication.

Download lifelog