Increasing bar code size or increasing its density has limitations.

增大条码尺寸或增大条码密度的解决方案都有其局限性。

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But the performance of this method deteriorates in the case of high density bar code image, which is severely blurred by a point spread function of optical system.

对于被光学系统点扩展函数严重模糊的高密度条码图像，这种方法的性能急剧下降。

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