The present invention relates to a method, a system, a neural network and a computer program product for determining the quality of an analytical process, preferably the confidence value. The analytical process is performed in a microchannel structure of a microfluidic device, from which data information of the analytic process is acquired by scanning at least one search area of the microchannel structure for signal data. The search area comprises the result of the analytical process and the acquired data information is stored as an image, one image for each scanned search area.