A high early strength pozzolan cement includes larger sized pozzolan particles blended with smaller sized hydraulic cement particles containing tricalcium silicate andor dicalcium silicate. The thermal model is configured to forecast, from the outputs of the plurality of temperature sensors, not only a temperature of the object to be processed contained in the processing container but also a temperature of at least one other predetermined portion in the processing container. Thus in the shooting mode a white spot light illuminates the object, and the object can clearly be confirmed. A controlled device may require at least one transmitter to be approximately aligned with a receiver andor may require an unobstructed signal path. Therefore, a threshold value can be generated based on the features of an image to be read, an optimal threshold value can be obtained depending on a medium and, as a result, a correct binarization process is available.