The weft-straightening machine SL smart is designed particularly for knitted and woven fabrics with a plurality of new design solutions. The heart of the SL smart system is the well-established advanced traversing camera technology which is unique in weft-straightening. The universal high-resolution camera captures more than 20 measuring points per meter of fabric width. Advanced evaluation algorithm enable an ultra-precise distortion analysis for perfect straightening results in a blink of time.