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In this paper, a Lorenz-like chaotic system was developed to encrypt the dorsal hand patterns on a microcomputer. First, the dorsal hand vein images were taken from the subjects via an infrared camera. These were subjected to two different processes called contrast enhancement and segmentation of vein regions. Second, the pre-and post-processed images were encrypted with a new encryption algorithm in the microcomputer environment. For the encryption process, random numbers were generated by the chaotic system. These random numbers were subjected to NIST-800-22 test which is the most widely accepted statistical test suite. The speeded up robust feature (SURF) matching algorithm was utilized in the initial condition sensitivity analysis of the encrypted images. The results of the analysis have shown that the proposed encryption algorithm can be used in identification and verification systems. The encrypted images were analyzed with histogram, correlation, entropy, pixel change rate (NPCR), initial condition sensitivity, data loss, and noise attacks which are frequently used for security analyses in the literature. In addition, the images were analyzed after noise attacks by means of peak signal-to-noise ratio (PSNR), mean square error (MSE), and the structural similarity index (SSIM) tests. It has been shown that the dorsal hand vein images can be used in identification systems safely with the help of the proposed method on microcomputers. INDEX TERMS Chaotic Encryption, random number generator, near-infrared imaging, SURF, hand vein imaging, microcomputer, raspberry pi.

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Özet:Bu çalışmada balina sürüsü algoritması kullanılarak ölü zamanlı sistemlerin denetlenmesinde kullanılan Smith Öngörücüsü için PID denetleyicisinin parametreleri belirlenmiştir. Ayrıca Smith Öngörücüsü için kullanılan Zeigler-Nichols veya AMIGO yöntemleri ile yapılan PID tasarımında kontrol işareti sınırlandırılmamaktadır. Bu kısıt aşımı ise kontrol işaretini oluşturan aktüatöre zarar verebilmektedir. Bu çalışmada balina sürüsü algoritması kullanılarak kontrol işaretinin sınırlandırılması yapılarak ölü zamanlı sistemler için ISE performans kriterine göre Smith Öngörücülü PID denetleyici tasarımı yapılmıştır. Yapılan denemeler ile balina sürüsü algoritması ile tasarlanan PID denetleyicisinin daha başarılı olduğu görülmüştür. Abstract:In this study, parameters of PID controller for Smith predictor used to control time delay systems were determined using whale optimization algorithm. Furthermore, the control signal is not constrained in the PID design by Ziegler-Nichols or AMIGO methods used for Smith Predictor. This constraint violations can damage the actuator. PID controller was designed with Smith predictor according to ISE performance criteria for time delay systems by limiting the control signal by using the whale optimization algorithm. Experiments have shown that the PID controller designed with the whale optimization algorithm is more successful.