Digital Chinese New Year Challenge
Short-focus fingerprint and telephoto fingerprint are two different fingerprint recognition technologies that differ significantly in their design and working principle. The differences between the two technologies are explained in more detail below.
1. Imaging principle.
Short-throw fingerprints, also known as contact fingerprints, are based on capacitive sensing based on their imaging principles. When the user presses his finger on the fingerprint recognition module, the ridge and valley of the fingerprint form different capacitance values with the sensing plate, so as to realize the acquisition of the fingerprint image. This method requires the user's finger to be in direct contact with the sensor board, hence the name short-throw fingerprint. On the other hand, telephoto fingerprints, also known as non-contact fingerprints, use imaging principles such as optics or ultrasound. In optical imaging, a light source forms a fingerprint image through the light reflected from the surface of the finger; In ultrasound imaging, a fingerprint image is formed by emitting ultrasound waves and receiving their reflected signals. The telephoto fingerprint technology does not require the user's finger to make direct contact with the identification module, hence the name telephoto fingerprint.
2. Focal length and recognition range.
There is a significant difference in focal length between the short-throw and long-throw fingerprints. Short-throw fingerprint recognition technology uses a shorter focal length to capture and identify fingerprints, typically within 100mm. Due to its short focal length, it can only capture fingerprint features at close range, so the recognition range is relatively limited. Telephoto fingerprint recognition technology, on the other hand, uses a longer focal length to capture and identify fingerprints, usually above 100mm. The telephoto fingerprint can capture fingerprint features from a distance, with a larger recognition space, and more detailed information can be viewed. Therefore, in terms of recognition range, the telephoto fingerprint has obvious advantages over the short-focus fingerprint.
3. Imaging quality and clarity.
There are also differences between short-focus and long-focus fingerprints in terms of image quality and sharpness. Short-throw fingerprints are generally sharper and have higher image quality in fingerprint imaging. This is because short-throw fingerprint technology uses the principle of capacitive sensing, which is able to capture the detailed characteristics of fingerprints more accurately. The image quality and clarity of telephoto fingerprints are relatively low, which may be affected by the limitations of optical or ultrasound imaging principles and environmental factors. Therefore, in terms of image quality and clarity, short-focus fingerprints have certain advantages over long-focus fingerprints.
Fourth, recognition speed and sensitivity.
Short-focus fingerprints and long-focus fingerprints also differ in recognition speed and sensitivity. Short-throw fingerprints typically have faster recognition and higher sensitivity. This is because short-throw fingerprint technology uses a shorter focal length and capacitive sensing principles to capture and recognize fingerprint features more quickly. On the other hand, telephoto fingerprint technology may be slightly inferior to short-focus fingerprint recognition speed due to the need to process longer distances and more detailed information. In addition, the sensitivity of the telephoto fingerprint may also be affected by the imaging principle and environmental factors. Therefore, in terms of recognition speed and sensitivity, short-focus fingerprints have certain advantages over long-focus fingerprints.
5. Applicable scenarios and security.
The application scenarios and security of short-focus fingerprints and long-focus fingerprints are also different. Short-throw fingerprint recognition technology is suitable for scenarios that require close contact, such as fingerprint unlocking on mobile phones, tablets, and other devices. Due to its fast recognition speed and small device thickness, short-throw fingerprint technology has high application value in these scenarios. The telephoto fingerprint recognition technology is suitable for scenarios that need to obtain fingerprint images from a long distance, such as fingerprint recognition at security doors, gates, and other locations. Telephoto fingerprint technology can provide a larger recognition space and higher recognition accuracy, so it has higher application value in these scenarios.
In terms of security, due to the use of non-contact imaging principle, telephoto fingerprint technology can avoid some potential security risks that may exist in contact fingerprint recognition technology, such as false fingers and other deceptive means. Therefore, from a security point of view, the telephoto fingerprint has higher security than the short-throw fingerprint.
6. Summary. Short-focus fingerprint and long-focus fingerprint are two different fingerprint recognition technologies, and they have obvious differences in imaging principle, focal length and recognition range, imaging quality and clarity, recognition speed and sensitivity, applicable scenarios and security. In practical applications, it is necessary to weigh the trade-offs between product positioning and user needs to select the appropriate fingerprint recognition technology. For example, on mobile phones, tablets and other devices, short-focus fingerprint recognition technology can be considered to improve the recognition speed and reduce the thickness of the device; In scenarios that require higher security, such as security doors and gates, telephoto fingerprint recognition technology can be considered to improve recognition accuracy and security.