In recent decades, measuring vital signs has been a popular topic for many researchers. The system for monitoring vital signs benefits humans in many aspects, such as patient health care and disease prevention for elderly people. As important vital signs, the heart rate and breathing rate, which is also called respiration rate (RR), have been attracting increasing attention and many methods for heart rate (HR) and breath rate (BR) detection have been proposed. The methods for measuring the HR and BR can mainly be divided into contact methods and non-contact methods. Contact methods, as the traditional techniques, are the most widely used measurement methods for signs because of their high accuracy. Most contact methods rely on Electrocardiography (ECG) or Photoplethysmography (PPG). As the most popular way, an ECG signal containing a considerable amount of useful information on vital signs is obtained by placing adhesive gel electrodes on a person's chest or limbs. PPG is an optical technique that can be used to detect variations in Blood Volume Pulse (BVP) (i.e., changes in the detected light intensity) in the microvascular bed of tissue. Meanwhile, the changes of the BVP contain useful information on the cardiovascular system, which could estimate the HR and BR. A PPG sensor is usually placed on the fingertip to effectively monitor the variations of the blood flow, because transmitted light can be easily detected. Therefore, PPG has also been a popular contact-based method in recent years. However, these contact methods may cause discomfort and inconvenience for users because users usually need to wear some devices, which requires skin-contact. Therefore, this project proposes a real-time method based on PPG for the contactless estimation of HR and BR.