Technical Research on Anime4K: Real‑Time Super‑Resolution Algorithm for Anime Images

Anime4K is a super‑resolution enhancement algorithm specifically designed for animated images, capable of reaching single‑digit millisecond latency when running on a GPU.

Source code and further details are available at https://github.com/bloc97/Anime4K .

Principle of Enhancement

1. High‑resolution image = low‑resolution image + residual.

2. The finer the edge details in the residual, the clearer the resulting image; therefore sharpening edges improves the original image's resolution.

3. Compared with waifu2x, this algorithm handles texture details less effectively but is well‑suited for animated pictures.

4. Many Android UI elements consist of rectangular boxes, which can benefit from edge‑enhancement.

5. Its real‑time performance matches scenarios where devices are rented for on‑the‑fly processing.

Application Results

1. Little effect on characters and text; only slight edge improvement.

Original Image:

Result Image:

2. On a regular CPU, real‑time performance is lower than expected, with processing times around 800‑900 ms per frame.