1. A method of estimating an optimized exposure time for an imaging-based barcode scanner comprising: determining a SNR decodability function that enables a decodability value be determined from a signal-to-noise ratio; determining a blur decodability function that enables a decodability value be determined from a blur value; measuring a blur and a signal-to-noise ratio for an image captured with a first exposure time; and determining the optimized exposure time based on the measured blur, the measured signal-to-noise ratio, and a combined decodability function that depends upon both the SNR decodability function and the blur decodability function.