The article presents a tool for generating and detecting optical signatures. The tool was implemented in the Matlab environment using the Matlab Simulink package. The publication contains a proposal to use the developed tool to study the impact of laser activation time, camera image resolution, frame rate as a result of optical signature detection. The obtained results proved that the developed tool successfully allows to research various methods of generating and detecting optical signatures. It also allows a quantitative assessment of the correctness of the detection process.
The article proposes a method that allows simultaneous identification of many optical signatures used for the optical control in augmented reality systems. Optical signatures are generated using appropriately coded laser pulse sequences. The developed method of identifying optical signatures allows to identify individual series of laser pulses and is based on the analysis of video sequence of images. This is an important enhancement in relation to the systems used to cooperate with objects in the augmented reality environment.
The aim of the paper is to determine the impact of the object’s location in relation to camera's optical axis on the distance measurement using the method belonging to the Depth From Defocus (DFD). The method has been developed to determining the shape of flaccid membrane used in Ventricular Assist Device (VAD). The tests were carried out in laboratory conditions. The research were carried out using a fixed miniature camera and a fixed focal length lens. The camera observed a marker with a diameter of 0.003 m, in various position relative to the optical axis perpendicular to the plane of the marker. The position of the marker was changed in three dimensions, with a 0.001 m step, in the range from 0 m to 0.010 m in directions according to X and Y. The Z direction was researched in the range from 0.100 m to 0.140 m with a step equal 0.001 m. The measurable effects of work are the recommendations regarding the correction of the distance measurement depending on the marker shift relative to the camera optical axis.
The article presents the method of encoding a laser beam for control systems. The experiments were performed using a red laser emitting source with a wavelength of λ = 650 nm and a power of P ≈ 3 mW. The aim of the study was to develop methods of modulation and demodulation of the laser beam. Results of research, in which we determined the effect of selected camera parameters, such as image resolution, number of frames per second on the result of demodulation of optical signal, is also shown in the paper. The experiments showed that the adopted coding method provides sufficient information encoded in a single laser beam (36 codes with the effectiveness of decoding at 99.9%).
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