3 research outputs found
Reliability of camera systems to recognize facial features for access to specialized production areas
The article deals with ergonomics and reliability of camera systems for recognition of
facial features and identify person for access to specialized areas. The monitoring of areas relates
not only to crime, but it is also an integral part of access to specialized production areas
(pharmaceutical production, chemical production, specialized food production, etc.). It is
therefore important to adequately secure these premises using the relevant system. One of them
is a system based on user identification using specific facial features. For this purpose, there are
CCTV systems for recognition of facial features of different price categories (conventional
cameras, semi-professional and professional) on the world market. However, problematic
situations may occur when identifying. For example, by having the user partially masked face.
This research is focusing on the problem. The main goal of the research is establishing the scale
of negative impact, in case the identified person has partially masked face, on camera systems
recognizing facial features, primarily on recognition time. The results are evaluated in detail.
Some camera systems are not suitable in specialized production areas due to their insufficient
recognition ability. From all the tested devices, the HIKVISION iDS-2CD8426G0 / F-I camera
identification system has proved to be optimal for identification purposes. In the case of
designing, it is therefore necessary to choose suitable camera systems that have ergonomics and
reliability at a level that will guarantee their sufficient use in the mentioned areas, while
decreasing comfort and user-friendliness as little as possible. By measuring the ergonomics and
reliability of these CCTV systems, it can be stated that there are statistically significant
differences between conventional, semi-professional and professional systems, and it’s not just a
design change, but also a more efficient recognition method
Text detection and recognition based on a lensless imaging system
Lensless cameras are characterized by several advantages (e.g.,
miniaturization, ease of manufacture, and low cost) as compared with
conventional cameras. However, they have not been extensively employed due to
their poor image clarity and low image resolution, especially for tasks that
have high requirements on image quality and details such as text detection and
text recognition. To address the problem, a framework of deep-learning-based
pipeline structure was built to recognize text with three steps from raw data
captured by employing lensless cameras. This pipeline structure consisted of
the lensless imaging model U-Net, the text detection model connectionist text
proposal network (CTPN), and the text recognition model convolutional recurrent
neural network (CRNN). Compared with the method focusing only on image
reconstruction, UNet in the pipeline was able to supplement the imaging details
by enhancing factors related to character categories in the reconstruction
process, so the textual information can be more effectively detected and
recognized by CTPN and CRNN with fewer artifacts and high-clarity reconstructed
lensless images. By performing experiments on datasets of different
complexities, the applicability to text detection and recognition on lensless
cameras was verified. This study reasonably demonstrates text detection and
recognition tasks in the lensless camera system,and develops a basic method for
novel applications