A New Approach for Precisely and Stably Detecting Image Scaling-Factor Changes

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  • 画像間倍率変化の高精度検出法
  • ガゾウカン バイリツ ヘンカ ノ コウセイド ケンシュツホウ

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This paper proposes a new approach for precisely and stably detecting changes in image scaling factor. DFT amplitudes for reference and input images are first transformed to the polar expressions. In the transformation, the cause of detection errors is analyzed and optimal frequency filtering for reducing errors is found. The position shift between the polar spectra is detected by our PSA method. The weight function effective for accurate detection of the shift is discussed. The approach is applied for detecting changes in image scaling factors for four typical types of images. It becomes clear that the scaling factor can be detected with higher accuracy by the proposed approach than by the conventional method. The accuracy dependences on the image pattern and scaling factor are also made clear and discussed.

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