Fingerprint scanners and locks use fingerprint patterns to scan and unlock doors; they work by matching a pattern with a template made of numbers. The fingerprints of the owner are stored in the template, which makes it impossible for someone else to use a lock without knowing the fingerprints of the owner.

Pros and Cons

Fingerprint scanners have their advantages and disadvantages.

Pros: Fingerprints are easy to remember, are non-transferable, and provide additional security against identity theft. They are also easier to use than other systems that rely on passwords or keys that are easily lost or shared. Fingerprint recognition also ensures a higher level of accountability. Once a fingerprint has been approved, it cannot be faked, and it can be used as evidence in a court of law.

Cons: Disadvantages of fingerprint scanners include the need for advanced and sometimes expensive computer hardware and software to maintain the security of the system. The fingerprint scanner cannot take into account physical changes in the fingerprint, which can lead to miss-readings. Additionally, fingerprint scanners are not always accurate due to the fact that many employees work with their hands. In addition, fingerprints may be scratched or rough, causing the system to miss readings.

Minutia Matching Algorithm

Fingerprint lock applications utilize an algorithm to match fingerprint minutiae with template fingerprints. The matching process involves comparing images of the fingerprint and the template. The matching score is a value between 0 and 1. A value of 1 indicates a perfect match, and a value of 0 indicates a complete mismatch.

This algorithm is based on a SIFT-based minutia descriptor. It works to identify minutiae locations and angles. It does not consider terminations that occur on the outer boundaries of fingerprint images. It locates minutiae points in a fingerprint image by using a feature called Crossing Number. This value is half of the intensity difference between two pixels. If the Crossing Number is greater than three, then the fingerprint image contains minutia points.

Optical fingerprint sensors

Optical fingerprint sensors work by using the principles of refraction and reflection to collect the fingerprint image. When the light hits the bottom of the fingerprint scanner, it bounces through a prism. If the line of your fingerprint is uneven, the light will reflect differently from this prism. The sensor will then collect this image information through a CMOS or CCD optical device. This type of sensor is especially useful for capturing a large area of fingerprint images.

Optical fingerprint sensors are very useful for fingerprint recognition, but they do have some limitations. For instance, the image quality can be affected by stray light from another source or by surface contamination, such as oil, dirt, and condensation. Additionally, the image may be distorted if two fingerprints are in the same area.

Capacitive fingerprint readers

Capacitive fingerprint readers work by detecting changes in a person’s fingerprints using an array of small capacitor circuits. These circuits are placed under a conductive plate. When a finger touches the conductive plate, the ridges of the finger change the charge of the capacitors, which results in a pattern. This pattern is then compared to the fingerprint stored on the device.

Capacitive fingerprint scanners are commonly used in mobile phones and other devices. The technology works by reading the fingerprint pattern by measuring the di-electricity and depth of the ridges of the finger. The sensor records these changes and records the digital data that can be compared with previously stored fingerprint images.

Enrollment process

Before using your Fingerprint lock, there is an enrollment process that must be followed. It’s important to keep several points in mind to ensure that your fingerprint enrollment is successful. The first step is to make sure that your finger is clean and centered on the fingerprint scanner. If it’s not, it will fail the verification process and you’ll have to start the process all over again. Also, make sure that your finger has no scars or marks. If possible, use hand lotion and moisturizing soap to keep your finger moist. The next step is to enroll two fingers. It is important that the fingerprints you enroll are clear, clean, and preferably from different hands. If your finger is worn or dirty, it will be difficult to enroll.


Choosing the right fingeprint scanner and lock solution may be complicated due to the variety of fingerprint vendors and the need to understand how to integrate the fingerprint technology solution into your new or existing system. 

Academy Intercom has been a leading expert in the New York area in assisting customers with finding just the right fingerprint solution. Academy Intercom will help with guidance on the best solution for your scenario, recommending vendors, and architecting a system that meets your particular needs. Academy will assist with fingerprint equipment installation and providing support post-installation.

Contact Academy Intercom @ 1 (212) 539-1000 by phone or click here to contact us via our sales inquiry form – we look forward to helping with all of your intercom system needs.

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