On the recognition of wood slices by means of blur invariants

•We improved the system for visual recognition of wood slices presented earlier.•We identified certain mistakes in the original system.•Our method is based on moment invariants with respect to blur.•TSpecific invariants to motion blur and out-of-focus blur are presented.

In the recent paper [6] the authors presented an automatic system for visual recognition of wood slices, which are placed on a moving platform. The original method was based on moment invariants. In this comment we explain the mistakes of the method and show how to properly use moment invariants in a wood-slice recognition system. This correction immediately leads to an increase of the recognition rate.