Research Regarding Types of Fingerprint Revealing Powder on Glass Surfaces

Title; When the fingerprint is hidden on the glass surface, the influence on the accuracy (%) of the fingerprint type display (black toner, white baby powder) changes. Introduction and purpose: Humans always touch various surfaces and objects with fingers. They may originate from a variety of different surfaces, light and dark, porous or non-porous, rough or smooth. These factors contribute to the visibility of fingerprints. "Fingerprints are a type of biometrics and forensic science to use physical features to identify them." "Fingerprint technology is called fingering." Detectives, criminal investigators, and

Use chemical methods: Display fingerprint patterns by spraying black powder on the surface. Fingerprint patterns can be lifted using Scotch tape. Various chemicals can be used such as cyanoacrylate (which can form fingerprints on various objects), ninhydrin (binds to amino acids present in fingerprints to produce blue or purple). In addition, magnetic powder can be used to reveal fingerprints and to act on glossy surfaces or plastic bags or containers. Use automatic recognition method: You can use various sensors to obtain fingerprint images. An example is a capacitive sensor that acquires a pixel value based on electrostatic capacitance of a fingerprint feature. Since each characteristic such as a fingerprint has a different electrostatic capacity, a photosensor which detects and measures a change in the reflectance of light of each characteristic by using a prism. The difference is thermal scanner. Temperature creates digital images over time

There are three general sensors for fingerprint authentication - optical, ultrasound, capacitance. Optical fingerprint imaging captures digital images of fingerprints using visible light. The surface layer of the sensor is called the touch surface, where the finger is placed. Below the surface there is a layer of luminescent phosphor that illuminates the surface of the finger. Light reflected from the finger passes through the phosphor layer and reaches the charge coupled device, and the charge coupled device captures the electronic signature of the fingertip. However, the quality of the image depends greatly on the condition of the skin. If the skin is dirty or eroded, it is difficult to accurately capture the image. If there is no "active finger" detector () in the fingerprint image, it is also easy to be cheated on fingerprint images.