1. A method for semi-quantitative or quantitative analysis of assays, wherein the method comprises: assigning at least one unique barcode coded text segment on a test strip of the assay, acquiring an image comprising the at least one barcode coded text segment together with response zones generated by the assay, identifying the at least one unique barcode coded text segment in the acquired image, and using this image of the barcode coded text segment as an optical calibration entity, using the optical calibration entity to detect positions of test result lines in the respective response zones generated by the assay.