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if blob.elongation() > 0.5: blob.elongation()文档里的解释是什么意思?
https://github.com/openmv/openmv/blob/60457cca3c8fe11ca04fa8c91a818ac81eb8e30d/scripts/examples/04-Image-Processing/02-Color-Tracking/single_color_rgb565_blob_tracking.py#L31
这里有注释的，只检测条形，不检测圆形。