| 摘要 |
An improved device for measuring the count and frequency of seeds in a stream of seeds is described. The device is useful for measuring the frequency and accuracy of seed planting devices. A seed counting system can include an imaging region, an image sensing device, and a lens between the imaging region and the image sensing device. An optical distance extender between the imaging region and the lens, creates an effective optical distance between the imaging region and the lens that is substantially greater than the physical distance between the imaging region and the lens, thereby providing a substantial depth of field.
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