1. Main Activity show camera preview screen
2. Analyze the face when happen in specific area 2.1 If have mask the frame will change to green 2.1.1 If no mask will change to red frame and upload to server 2.2 If target have mask and temperature normal whill target the message box let user press 2.2.1 If the target have mask but temperature abnormal will change to red frame and alert voice
3. If specific area no detect face over 1 min will show black screen