The invention relates to a method in image processing, wherein an image in digital form is in coding phase compressed, quantized by a quantization matrix and coded by a coding matrix, wherein one or more data frames are formed. Cellulose esters can be produced by esterifying cellulose in a reaction medium comprising one or more ionic liquids. The thus-corrected peak value is fed back to control the motor current to conform to a target motor current value. Each target includes a plurality of rungs, each spaced from each other by a predetermined distance. The filter includes a model of the navigation component, and one or more parameters of the model are configured after startup of the inertial navigation system based upon performance characteristics of the individual navigation component included in the inertial navigation system. Currents are caused to flow through the two coils in directions opposite to each other to improve the degree of uniformity of the magnetic field in the vertical direction, thereby reducing the degradation thereof by equal to or smaller than 2 figures compared with the degree of uniformity of the static magnetic field generated by the existing MRI system.