Tag Archives: 4k video converter

How to Upscale 1080p to 4K – Magic behind the Video Processing

digisns76 No Comments

If you listen to the marketing from TV manufacturers, it seems TVs with 4K resolution will deliver a massive boost in picture quality. And, if you’re lucky enough to actually have a source of real 4K video — one with the same 3,840×2,160-pixel resolution as 4K TVs — you may well be able to see additional detail. Though 4K diaplay are everywhere, real 4K contents are not. Almost all the streaming videos, DVDs, TV broadcast, Blu-ray and other available contents today are 1080p, 720p or even 480p. To watch 1080P or lower resolutions on 4K UHD TVs or screens, there is a step called 4K upscaling. How this works? Go check this post.

What is 4K upscaling?

Upscaling (also upconverting) refers to a process of converting low resolution material into a higher definition – or that’s what it’s purported to do anyway. And 4K upscaling means enlarging the 1080P, 720P or lower-resolution images to near 4K quality to fit the large 4K display. Simply put, 4K displays have 3,840×2,160 pixels, while 1080P videos have 1,920×1,080 pixels. The 4K displays will have four times as much the screen space to fill than 1080P. Therefore, if the 4K TV displays a 1080P video without upscaling, the screen will look like below. For lower resolutions, the image will be smaller.

1080p on 4k tv

How to Upscale 1080p/720p to 4K Video in Just Few Clicks

To upscale video to 4k quaility, there is a video processing technology called interpolation, a process fo creating new pixel points within the range of a discrete set of known pixel points. Simply put, as shown in the above picture, it needs to create more pixel pionts to fill the blank area of a 4K dispay. There are several upscaling algorithms to help achieve this. Here we will introduce you the major consumer-level UHD upscaling algorithms used by 4K TVs, Blu-ray players and other devices: nearest neighbor interpolation, bilinear interpolation and bicubic interpolation. Let’s see how each method works.

1. Nearest neighbor interpolation

Nearest neighbor interpolation, also known as point sampling, is the simplest, fastest and also widely-used method to upscale videos to 4K from 1080P or lower. Unlike the two other methods, it determines the new interpolated pixel by the nearest neighbor point in the input vector or matrix without calculating the value via any weighting criteria or complicated rules. It thus has a lot of blurriness and artifacts.

nearest neighbour interpolation

2. Bilinear interpolation

Linear interpolation is implemented in both X and Y directions (and Z for 3D). And bilinear interpolation is a method that uses the distance-weighted average of 4 nearest known neighboring pixel points to determine the new pixel value. The output pixels are heavily influenced by the neighboring four points. This method is better than the nearest neighbor interpolation but also has visible artifacts and blurring.

bilinear interpolation

3. Bicubic interpolation

In Bicubic interpolation, the interpolated pixel is calculated as the weighted average of 16 (4×4) nearest neighboring points. Generally, bicubic interpolation is more complicated than the other two 4K upscaling methods, but generates more fine details than its bilinear counterpart. Currently, many commonly-used 4k video upscaler programs such as Adobe Photoshop and Corel Photo-paint use Bicubic interpolation as the standard.

bicubic interpolation

So what the easiest way to improve video quality?

To upscale your 1080p to 4K videos with 99% video quality, the key is to get a good 4K upscaling software, which can get this task done. To make it short, Pavtube Video Converter Ultimate is the desirable 4K upscaler for good reasons:

1. Convert video with SD/HD resolution, Blu-ray, DVD to MP4, MOV, M4V, MKV, and other hundreds video formats, and upscale the videos to 4K.
2. Flexible parameter adjustments offers options to upconvert videos to 4K 60fps or 30fps, compress upscaled 4K videos to 30%-70% smaller, etc.
3. Massive video formats, optimized device presets including iDevice, Andorid devices, game console, TVs, Windows operating system, non-linear editing software, and other for you to select with best settings.
4. Rich video editing features allows you to trim the video length, crop video aspect ratio, add image/text watermake, inset external subtitles to it, more features here are beyond your imagination.

Step by step to upscale 4K from 1080P, 720P, SD 540P, 480P

Step 1. Load video files you want to upscale

Click "File" to load the video you to upscale to this software, you also can directly drag or drop the video to this software. Moreover, batch conversion is available here, you are able to upscale several clips at a time.

To download: Pavtube iMedia Converter for Mac


Step 2: Choose output file format.

From "Format" bar drop-down list, select H.264 file format by following "HD Video" > "H.264 HD Video(*.mp4)". If you plan to play the upscaling videos on 4K TV, just output H.265 codec which offers the best 4K picture quality with small file size. Or you can driectly follow TVs and output the one you prefer.

Define output file format

Step 3: Adjust output file size as 3840*2160.

Click settings to open "Profile Settings" window, here you can adjust the output file resolution as "3840*2160" by typing the value beside the brackets of "Size(pix)" in the video section.

h.264 settings

Step 4. Start upscaling 4K video

Click Convert and start the video processing. Wait for a while, you can click Open the output folder to locate the generated file. Now you can trasfer the video to your 4K TV for enjoyment, it will not get you down.


Big News for Sony FDR-AX33 Handycam Unveiled at the 2015 CES

digisns76 No Comments

Sony FDR-AX33—which attracted a lot of attention since it has been released out
Sony Electronics, a worldwide leader in digital imaging, has today introduced its most compact 4K1 Handycam® camcorder to date, the new FDR-AX33 model. About 30% smaller and 20% lighter than the current FDR-AX100 4K Camcorder introduced at CES 2014, the new FDR-AX33 features impressive Balanced Optical SteadyShot™ (B.O.SS) image stabilization and 4K 100Mbps high-bitrate recording, bringing new levels of performance to the consumer camcorder market.


Advanced Features:

  • 0.24″ OLED EVF
  • Direct Pixel Read Out
  • Balanced Optical SteadyShot Image Stabilization
  • XAVC S, AVCHD, and MP4 Codecs
  • 3.0″ Xtra Fine LCD Touchscreen Display
  • 5.1 Channel Mic with Audio Record Controls
  • Simple Connectivity to Smartphones via Wi-Fi/NFC
  • Carl Zeiss Vario Sonnar T* Lens with 10x Optical Zoom
  • Capture 4K Ultra HD Video(most important)

What can 4K Ultra HD video bring to us?
Capture the finest details in 4K Ultra HD 3840 x 2160 resolution. This camcorder allows incredibly high resolution, to produce vibrant and realistic images. In addition, the fast Bionz X image processor is the same one employed in professional Sony camcorder models, making it possible to record 60p movies at Full HD resolution for incredibly smooth and sharp playback, with no loss in realism, even when panning the camera and shooting moving subjects

How could we usually work with 4K HD recordings?
Sometimes, we have to admit that we need to do some further dispose with the 4K shootings, right? In some ways, not all NLEs such as FCP, Avid, Adobe or iMovies, etc. or some popular media players directly, so we here recommend you a professional Pavtube 4K Video Converter for Windows/Mac if you need. This program can handle the all different videos as input(4K included) and various suitable ones as output. For example the Samsung NX1 4K camcorder

Designed for a wide range of users, the camcorder features a range of automatic image and audio options for easy point-and-shoot operation, as well as enhanced manual controls that give you more creative freedom. An assignable ring in the front of the camcorder can be assigned to control of zoom, focus, exposure, iris, shutter speed, exposure, or white balance. A rechargeable lithium-ion battery pack is included for powering the camcorder, which can be re-charged using the camcorder’s built-in USB charging cable. Also included with the camcorder is an AC adapter, USB connection support cable, and an HDMI cable.

If you are Sony fans, you won’t be disappointed with this new kind 4K camcorder—Sony FDR-AX33 Handycam camcorder. Just enjoy yourselves ffor watching 4K movies! Thanks for reading!