Four years ago, China's first independent 4K restoration of the classic film "Horse Thief" showed a new look, the people of the whole country have witnessed the old film a new side, this is the first time in China to launch an independent 4K restoration of the classic film, representing the highest level of domestic film restoration technology at that time.
So far, more and more classic films have been restored and re-appeared on the big screen, such as the "Founding Ceremony" that records the moment of the founding of New China, the "Heavenly Book" that occupies the childhood memories of generations, and the "Eternal Electric Wave" that turns black and white...
The film repair program is complicated, and the combination of manual repair and AI repair can achieve more with less. This article will use the video ultra-high definition engine of microframe technology as a basic tool to share from the perspective of AI repair.
01. Image quality restoration enhancement
Improper preservation leads to scratches, blurry picture, serious loss of details; the picture is full of heat noise, block noise, mosquito noise and other types of noise; there is a deviation in color... Wait, these are the common problems of old films. Microframe [Image Quality Repair Enhancement] can synthesize video picture quality, combined with deinterlacing, denoising, sharpening, CNN and other processing technologies, strengthen texture details, improve the overall clarity of video, and make the picture clear, clean and natural.
Taking the animated version of "Journey to the West" as an example, the outline of the edge of the screen is blurred, there are noises such as mosaics and artifacts, which are enhanced by micro-frame quality repair, adaptive judgment of noise, and intelligent adjustment according to noise intensity, and the picture is instantly renewed, such as being reborn.
02. Intelligent super resolution
Light repair picture quality is not enough, most of the old films are small resolution, in order to put the old film in the current mainstream 2K, 4K screen or 12 million pixels on the giant screen, if directly enlarged, field patterns, mosaics, sawtooth and other issues will come out. Through the micro-frame [Intelligent Super Resolution] technology, it intelligently matches the media content, performs key over-division, can efficiently improve the video resolution, and can clearly appreciate classic old films on the big screen.
03. Intelligent interpolation
At present, the mainstream TV / mobile phone is basically a high refresh rate screen, but many film frame rates are only 24 frames ~ 30 frames, can not match the high refresh rate screen, in some high-speed moving scenes will appear screen inconsistencies, blur and other phenomena, micro-frame [intelligent interpolation] technology based on motion analysis of the frame rate sampling reconstruction, according to the relationship between the two adjacent frames, estimate the object motion trajectory, insert an intermediate frame, improve the video frame rate, make the picture more smooth, motion details display more clearly.
04. Frame color HDR
As mentioned earlier, one of the common problems in old films is the deviation of color, coupled with the increasingly high requirements of the audience for the viewing experience, as well as the mass production and promotion of HDR content and equipment in recent years, color enhancement has also become a very important part, and fuller colors can make the audience more representative. Microframe [Frame Color HDR] technology can automatically analyze the color range and brightness of the video, and convert the SDR video into hdR video with high dynamic range, high color depth and wide color gamut, so that the film color is more delicate and natural.
05. Intelligent tone mapping
It is worth mentioning that for devices that cannot support HDR video decoding and display, microframes use [intelligent tone mapping] technology to convert HDR videos into SDR videos that can be played by all devices, while retaining the original HDR colors, so that ordinary screen device users can also feel the charm of HDR.
Restoration itself is a kind of protection, a film that carries the memories of generations of people, a film blinded by the dust of time, using modern technology to make these gradually sealed in the years shine again with the original color.
Let the blurry image return to its original appearance, let the dim film shine, make up for the shortcomings of the original film through technology, share the memory of the times, and let the audience feel the dual enjoyment of mind and vision while watching the movie, which is the meaning of the microframe video ultra-high-definition engine.
Microframe video ultra-high-definition engine, as a video AI intelligent product built with high-definition visual experience as the core, has been applied to the domestic TOP-level TV/movie platform with excellent effects and excellent performance. To achieve the vision of "HD future", there is still a long way to go, microframe will also combine its own technical advantages to continue to explore, optimize, expand more technical capabilities, for the construction of a high-definition future to contribute, but also welcome all friends and microframes to communicate and discuss together!