lighting plays a key role in night escapes of urban spaces, in a way that it can be effective in giving identity to them. by considering this importance and inexistence of a process for composing urban lighting strategy made this study to be conducted by the objective of providing process for compilation of context-oriented lighting strategy in urban spaces. reaching a suitable solution for lig...

Automatic road extraction from aerial images can be very helpful in traffic control and vehicle guidance systems. Most of the road detection approaches are based on image segmentation algorithms. Color-based segmentation is very sensitive to light changes and consequently the change of weather condition affects the recognition rate of road detection systems. In order to reduce the light change ...

OF DOCTORAL DISSERTATION HELSINKI UNIVERSITY OF TECHNOLOGY P.O. BOX 1000, FI-02015 TKK http://www.tkk.fi

Plant Factory With Artificial Lighting consists of a protected horticulture system in controlled environment facilities, combination with various levels growing surface and factors such as lighting, cultivation system, crop nutrition, energy efficiency. The objective this study was to identify published scientific articles the current topics addressed, potentialities challenges identified, thei...

An array of spatially distributed light-emitting diodes (LEDs) can produce an illumination pattern that approaches an image by individually modulating each LED. In this letter, I analyze the first-order design of such systems in order to achieve the best match between the illumination distribution and a desired image. In particular, simple formulas are given for the optimal number of LEDs, work...

The technological innovation in the field of lighting and need to reduce energy consumption connected public are leading many municipalities undertake renewal systems, by replacing existing luminaires with LED technologies. This renovation process is usually aimed at increasing efficiency reducing maintenance costs, whist improving performance. To achieve these results, new often characterised ...

In this paper, we introduce the Virtual Photometric Environment which is one of mixed reality systems. The Virtual Photometric Environment enables arbitrarily control over the lighting directions and reflection properties of objects. The environment is realized by photometric pattern projection onto screen objects. Reflection properties of the photometric patterns are acquired from real objects...

Artificial lighting is a main source of interference on free space photoelectric systems for communication applications. This work presents digital measurements and numerical analysis of the time and frequency characteristics of artificial lighting interference using Welch Power Spectral Density estimate and spectrogram with Short Time Fourier Transform. Measurements of time waveforms and spect...