Фото: Valentyn Ogirenko / Reuters
故乡也变得有点叫人“不认识”了。春节假期回去了一趟，那种熟悉的陌生，让人感慨系之。曾经，一两年回乡一次，观感和记忆中没什么两样。而今，依稀是旧景，却又处处透着不同。假期，景点免票、公交免费，市民游客逛得开心、行得便捷。曾经零落破旧的荒废小园、堆满建筑废料的断头路，摇身一变都成了“口袋公园”。欢声笑语替代了往日沉寂，人们或跑步、或打球，或有三五儿童在玩沙。
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We can see that the threshold map distributes perturbations more optimally than purely random noise, resulting in a clearer and more detailed final image. The algorithm itself is extremely simple and trivially parallelisable, requiring only a few operations per pixel.