Updated read_image_gray function and its @check() parameter
Updated read_image_gray function and its @check() parameter

acislab/HuMaIN_Microservices,acislab/HuMaIN_Microservices,acislab/HuMaIN_Microservices,acislab/HuMaIN_Microservices,acislab/HuMaIN_Microservices