As of Feb. 27, a selection of Bose QuietComfort headphones have dropped from $349 to $199.99 at Amazon. There's a nice variety of colors on sale at this price, so you can choose between black, cypress green, moonlight grey, petal pink, and white smoke.
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Real image compression (JPEG, PNG) uses different techniques (DCT, entropy coding), but quadtrees capture the same principle: spend your bits where the detail is, not uniformly across the whole image.，详情可参考51吃瓜
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