1. A control loop for regulating a combustion process in a plant, wherein the plant has a controlled system for converting material by way of the combustion process while at least one flame is formed and at least oxygen is supplied to the combustion, the control loop comprising: at least one observation device for imaging at least the flame; sensors for determining input data; at least one adjustment device for adjusting at least one supply selected from the group consisting of a supply of the material and the supply of at least oxygen, wherein the adjustment device is for being controlled by output data; at least one computer for evaluating at least the input data with regard to target values and for determining the output data by using a current process model, wherein the computer has a feature extraction module, the feature extraction module is for extracting features from at least the input data by way of an information measure, the features are informative for the target values, and the features are for an alternative process model.