Abstract: Methods, apparatus, systems and articles of manufacture are disclosed to control auditing devices, comprising a communications interface to transmit first auditing instructions to the auditing devices, a sampling frequency determiner to collect sampling information corresponding to a first number of stores at a first time, a a sample size determiner to calculate a second number of stores to sample based on the sampling information, and when a difference between the first number of stores and the second number of stores satisfies a threshold, improve an accuracy in the sampling information by calculating second auditing instructions having an updated sampling frequency.

Abstract: Methods, apparatus, systems and articles of manufacture are disclosed for text extraction from a receipt image. An example apparatus for clustering vertices, the apparatus comprises machine-readable memory, instructions, and processor circuitry to execute the machine-readable instructions to calculate a centroid corresponding to coordinates, calculate distances for respective ones of the coordinates relative to the centroid, calculate differences between the distances, determine whether ones of the differences satisfy a set of thresholds, in response to determining that ones of the differences satisfy the set of thresholds, calculate bearing angles for ones of the coordinates, determine an efficiency metric associated with respective ones of the bearing angles, sort each of the bearing angles based on the associated efficiency metric, and form coordinate clusters based on the sorted bearing angles.

Abstract: Methods, apparatus, systems and articles of manufacture are disclosed to control auditing devices, comprising a communications interface to transmit first auditing instructions to the auditing devices, a sampling frequency determiner to collect sampling information corresponding to a first number of stores at a first time, a sample size determiner to calculate a second number of stores to sample based on the sampling information, and when a difference between the first number of stores and the second number of stores satisfies a threshold, improve an accuracy in the sampling information by calculating second auditing instructions having an updated sampling frequency.