Traditional image enhancement algorithm enhances the contrastgrade and noise of image at the same time. So, noise reduction is needed.
传统图像增强算法在增强对比度的同时，也很大地提升图像噪声，需要对图像进行降噪处理。
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By contrast, Anki estimates how soon you will next see the card right before you grade it (you are still supposed to grade by difficulty, but the dates are also right there for your consideration).