| 摘要 |
When a displacement between a reference flame of a plurality of images acquired by continuous image pickup and a target flame is less than a first threshold indicating that such a flame is not likely to be affected by occlusion, smoothing is performed on an object area through a morphological operation with a normal process amount. Conversely, when a displacement between the reference flame of the plurality of images acquired by continuous image pickup and a target flame is larger than or equal to the first threshold, smoothing is performed with the process amount of morphological operation being increased than a normal process amount.
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