Season 1 The source with the 936p native resolution has a relatively poor quality. The problem of lack of bitrate occurs unsurprisingly since the anime comes from DMM Pictures. In flat areas, some noise was encoded into blocking. Fortunately, though there's some ringing and aliasing, no severe DCT noise can be observed in lines; no apparent banding was occurring in flat areas either. So we used descaling and reconstruction to fix the lines, then regular anti-aliasing, debanding, compensative sharpening, and deringing. Lastly we separated the noise layer to remove the nasty noise while applying adaptive denoising.
第二季 原盘画质难以言表,不知道 BD 出于什么考虑,相比 WEB 片源多出了相当重的动噪,搭配 DMM 一如既往的糟糕编码,给画面带来了不可逆的风味。本片原生分辨率 900p,画面较糊,线条有程度不一的蚊噪,还有锯齿和一些振铃。超强动噪带来的唯一优势就是没什么色带,但压碎的噪点观感实在难看。处理上,首先是基于神经网络的自适应去色块,消除蚊噪削弱烂噪,紧接着是较强的时域降噪。然后是常规操作:逆向拉升重构、抗锯齿、去振铃、去色带。为了提升观感,我们在上述处理的同时加深了线条。最后我们重构了噪点层,在尽量保留纹理的前提下舍弃了大部分烂噪,再补偿一定量的动噪以维持观感。对于部分毁灭级重噪场景(比如 16 集正片末尾和 20 集 ED),画质已经全损,基本无力回天,我们用 Crunchyroll 的 Web 源画面进行了替换,再进行上述处理。另外我们对 FHD 素材进行了针对性保护以防止过度处理。
Season 2 The source quality left us speechless at the very beginning. There's a large amount of dynamic noise compared to the web-dl source, which, combined with DMM's usual poor encoding, gives the image an irreversible characteristic. So far, we still don't know what this is for. At a native resolution of 900p, the image is blurry, with varying degrees of DCT noise in the lines, plus aliasing and some ringing. The only advantage of the extra dynamic noise is that there's not much banding, but the badly-encoded noise has a really bad viewing. Processing, the first is neural network adaptive deblocking, eliminating DCT noise and weakening the badly-encoded noise, followed by aggressive temporal denoising. Then comes out the usual methods: rescaling, anti-aliasing, de-ringing, and debanding. To enhance the viewing experience, we sharpened the lines along with the above processing. Finally, we reconstructed the noise layer, discarding most of the badly-encoded noise while trying to preserve the texture, and compensating for a certain amount of dynamic noise to maintain the viewing experience. For some of the horrible scenes with extreme noise (such as the end of the EP16 main feature and the EP20 ED), where the image had been completely damaged and could not be restored, we replaced them with Crunchyroll's web-dl source and then processed them as described above. In addition, we have protected the FHD footage to prevent over-processing.
重发修正: 1. 修正第一季 11 集画面错误(参考截图第一组) 2. ED 专辑替换为无损版本
Reseed comment: 1. Fix image error in S1E11 (refer to the screenshot) 2. Replace ED album with lossless version
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