IMAGE PROCESSING METHOD, IMAGE PROCESSING APPARATUS, AND RECORDING MEDIUM

摘要

A processor performs pattern matching on a search target image using a reference image. The processor uses the reference image to calculate a model pyramid, which has model edges and different layers, and uses the search target image to calculate the search target pyramid, which has search target edges and layers having size reduction factors which are the same as those of the model pyramid. The processor performs pattern matching on the search target pyramid using the model pyramid. Calculation of the model pyramid includes (i) extracting and calculating sizes of edges from the reference image, (ii) obtaining maximum size reduction factors of the individual edges, and (iii) setting an edge (a) which has a size reduction factor equal to or larger than a target layer size reduction factor and (b) which has been subjected to size reduction as a model edge of the target layer.

主权项

1. An image processing method to cause a processor to perform pattern matching on a search target image using a reference image, the image processing method comprising:
causing the processor to calculate a model pyramid which has different layers having different size reduction factors and which includes model edges in individual layers of the model pyramid using the reference image; causing the processor to calculate a search target pyramid which has layers having size reduction factors which are the same as those in the layers of the model pyramid and which includes search target edges in individual layers of the search target pyramid using the search target image; and causing the processor to perform pattern matching on the search target pyramid using the model pyramid, wherein the calculation of the model pyramid includes
causing the processor to extract a plurality of edges from, the reference image,causing the processor to calculate sizes of extracted individual edges,causing the processor to obtain maximum size reduction factors of the individual edges in accordance with the calculated sizes of the extracted individual edges, andcausing the processor to set, when a target layer which is a target one of the plurality of layers of the model pyramid is to be generated, an edge which has a size reduction factor equal to or larger than a size reduction factor of the target layer and which has been subjected to size reduction by the size reduction factor of the target layer as a model edge of the target layer.