Digital image processing is the use of computer algorithms to improve image quality, to extract or add information. Image compression is a part of image processing and is used to reduce the quantity of data to store. This paper presents the implementation of image compression operations on low cost embedded systems (Raspberry Pi 3, Arduino Uno R3). Motivated by the work of Tchagna et al. (DOI: 10.5815/ijigsp.2018.11.05), we proposed within this paper a real-time implementation of the compression algorithm on embedded boards. Our investigation in this paper is to make a real-time compression system able to capture an image, apply compression algorithm and save compression image on an SD card (for Arduino or Raspberry) or sent directly compressed image to cloud. Compression system with a Raspberry Pi basically used a webcam USB camera to capture the images, the compression function based on python language, and a function to store compressed image to an SD card or to Cloud. The compression system with Arduino used an SD card where the image to be compressed are stored, an external SRAM chip, and an Ethernet shield. The proposed hardware system can decompress the image. In opposition to the approach adopted in the literature, all the results presented within this work use the vector quantization. Eight images have been used to evaluate and compared the compression time for each board according to codebook size used during vector quantization step. Based on our results, we remark that compression and decompression time using Raspberry Pi is lower than compression and decompression time using Arduino. Raspberry Pi offers many possibilities and its processor is bigger than Arduino processor. This justifies the obtained compression and decompression time using Raspberry Pi compared to those with Arduino.
A virtual coincidence unit, a virtual counter and a virtual timer were developed via a software in this study. Different frequency signals supplied from a function generator were sent to a real coincidence unit. The same signals were transmitted to the virtual coincidence unit via a digitizer. Output signals of the real and virtual coincidence units were counted by real and the virtual counters. Count periods were set through real and virtual timers. For different count periods, coincidence counts obtained from the virtual counter were compared with those of the real one. It was seen that obtained results were highly compatible with each other for low frequency (25 – 55 Hz) signals.
The special point is found in frequency characteristics of one model of an oscillatory contour about which it wasn't reported earlier in the scientific literature. The point settles down at a frequency, the smaller resonant frequency of a contour. The module of an impedance doesn't depend on the size of active resistance at this frequency. Physical interpretation of the phenomenon doesn't exist at the moment and it is main question. The aim of this article is the complete description of the properties system with the observed effect - results of calculations of existence region of the module are for the first time given in it. For comparison two models of an oscillatory contour are considered. Existence region of the impedance is essentially different for the considered models. Phase charts of an impedance are calculated with same aim. Results of the research can be used in the electrical and the electronic engineering and textbooks for profound studying of electrical equipment.
Due to the fact that the traditional Digital Electronic Technology (hereinafter referred to as DET) experiments bear sufficient reference material, elaborate design plan and complete design circuits (which makes it difficult for the students to design some experiments by themselves innovatively), but fail to bear enough experimenting methods, combined with the requirements raised by the competitions for experiment case teaching of elementary curriculums on electronic engineering and technique, in order to make some changes to the traditional experiment teaching, the paper innovated a new experiment case for the design of Rock-paper-scissors Game. In the design, two methods, Digital-integrated-circuit method and programmable-techniques method, are adopted to make it come true. When adopting digital-integrated-circuit method, right integrated circuit components will be employed according to the game-designing plan, using the software of Proteus to simulate it first, followed by debugging and testing of the hardware circuits on the bread board. The programmable-techniques method can describe the functions of the game on the development platform of the software of Quartus II by programming, adopting HDL (hardware description language). After right simulation, the programs will be downloaded onto FPGA experimental boxes or development board to realize the design of the game. The experimental case of Rock-paper-scissors Simulation Game is interesting and novel, which tends to stimulate the students to explore new world, study and innovate new things on their own. The adoption of the two methods will not only further enhance students’ knowledge application ability and engineer practice ability, but also help them better understand the difference of an experiment between the traditional and modern method, which will, in turn, understand the significance and value of programmable techniques in digital system designing.
This paper focuses on the Binary Phase Shift Keying Digital Modulation Technique for Noiseless and Noisy Transmission with the following objectives:(i) to design a BPSK system (ii) to show the modulation and demodulation of a BPSK technique through a noiseless channel and (iii) to show the modulation and demodulation of the same technique through a noisy channel. A model-based design methodology was employed in this work. The entire idea was modelled in Matlab/Simulink environment. The results obtained after analysis and simulation show good system design and specifications. Demodulated bits will be in error if transmission channel is noisy.
