Acquisition and processing of transilluminative images of a hand with use of multi-chromatic optical radiation source

Prześwietlanie optycznie mętnych obiektów biologicznych jest zada-niem trudnym. W artykule przedstawiono wyniki prześwietleń ręki. Opisano transmisję promieniowania optycznego w zakresie 500–1500 nm. Wyznaczono okna transmisyjne oraz oszacowano wartość optycznego sygnału wyjściowego z prześwietlanego obiektu. Przedstawiono schemat blokowy stanowiska do rejestracji obrazów transiluminacyjnych. Zamieszczono przykładowe obrazy transiluminacyjne poddane wstępnemu przetwarzaniu i analizie.Transillumination of turbid biological objects is a difficult task. The easiest way to obtain a transillumination image is through observation of the illuminated object with a camera. The paper presents the results of hand transillumination. The transmission of optical radiation (in the 500-1500 nm wavelengths range) through the metacarpus is described. A method applied to optical transmittance measurements (Fig. 1) is discussed. Two transmission windows of 630-950 nm and 1000-1140 nm (Fig. 2) are found. The value of the transillumination optical output signal is estimated. The next part of the paper presents a block diagram of the hand transillumination image recording setup (Fig. 4) and the spectral characteristic of the emitter (Fig. 3). Sample transillumination images are also included. The problem of overexposure of the camera detector (Fig. 6) is pointed out. The images recorded during transillumination of a hand with three different wavelengths are presented. To improve the quality, one of the images has been processed with a Gaussian sharpening filter (Fig. 7). Based on the results of the analysis of the recorded test results it can concluded that it is purposeful to conduct further research to find optimal conditions of transillumination and algorithms which will allow to highlight information about the anatomical structure of tested body parts