A calibration platform for geometric calibration of multi-sensor image fusion system is presented in this paper. The accurate geometric calibration of the extrinsic geometric parameters of cameras that uses planar calibration pattern is applied. For calibration procedure specific software is made. Patterns used in geometric calibration are prepared with aim to obtain maximum contrast in both visible and infrared spectral range -using chessboards which fields are made of different emissivity materials. Experiments were held in both indoor and outdoor scenarios. Important results of geometric calibration for multi-sensor image fusion system are extrinsic parameters in form of homography matrices used for homography transformation of the object plane to the image plane. For each camera a corresponding homography matrix is calculated. These matrices can be used for image registration of images from thermal and low light camera. We implemented such image registration algorithm to confirm accuracy of geometric calibration procedure in multi-sensor image fusion system. Results are given for selected patterns -chessboard with fields made of different emissivity materials. For the final image registration algorithm in surveillance system for object tracking we have chosen multi-resolution image registration algorithm which naturally combines with a pyramidal fusion scheme. The image pyramids which are generated at each time step of image registration algorithm may be reused at the fusion stage so that overall number of calculations that must be performed is greatly reduced.

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Introduction The important indicators of the quality of work in blood transfusion banks and health care facilities in general is the ratio of the cross-matched red blood cell (RBC) units, and the number of transfused RBC, known as cross-match to transfusion ratio (C:T). The objective of this research was to provide an assessment of the quality of our work in a cross-sectional study, showing C:T ratios for certain areas of surgery or particular surgical indications. Methods We analyzed the data related to the activities of the Department for Pre-Transfusion Testing and Blood Distribution at the Blood Transfusion Institute of Serbia during the September and November of 2017 period. In total, 341 patients were included in the study, for whom 1,067 RBC units were requested. Results In pre-transfusion testing, 562 units were cross-matched and 249 units were transfused. The overall C:T ratio was 2.25. There are variations in C:T by departments. For the departments of abdominal surgery and reanimation, where uncrossmatched RBC units were requested, C:T was < 2. Other departments had C:T > 3 for almost all therapeutic areas. Conclusion Our results show that the C:T ratio ranged 2.02-3.6, indicating the need to reevaluate the protocols based on which the blood is requested according to individual indications, to adequately prepare patients for surgery in order to reduce the risk of possible allogeneic transfusion, and to apply Patient Blood Management protocols, which include the use of alternatives to allogeneic blood transfusion.

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