Video Scaler Resizing 480p to 720p Without Scaling Artifacts
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Solution Overview
Problem
Existing video scaler systems introduce scaling artifacts when converting 480p60 video signals to 720p60, due to non-integer resolution ratios and pixel size mismatches between NTSC and HDTV formats, while maintaining 60 frames per second and progressive scanning.
Innovation Solution
A video scaler device, such as the Folsom ImagePRO-HD, is used to resize the 480p60 video signal into a 1280×720@59.94p format by reducing active horizontal and vertical lines, ensuring a pixel-for-pixel translation within the 720p space, avoiding scaling artifacts and maintaining the original frame rate and scanning mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing video scaler systems convert 480p60 video to 720p60 by forcing the resized picture to fill the whole higher-resolution frame, then the resolution is increased, but scaling artifacts are introduced due to non-integer resolution ratios and pixel size mismatches
Solution Approach 1:
The patent segments the 720p frame into two distinct regions: a central active area that receives the scaled 480p content and a surrounding border area that is filled with black pixels. This segmentation allows the scaled content to be displayed without forcing it to fill the entire frame, thereby eliminating scaling artifacts while maintaining the higher resolution benefit.
Solution Approach 2:
The patent introduces black pixel borders as an intermediary element between the scaled 480p content and the 720p frame. These black borders act as a buffer that prevents the scaled content from touching the frame edges, thereby avoiding the scaling artifacts that would occur if the content were forced to fill the entire frame.
2Manufacturing precision
If the video picture is resized from 480p60 to 720p60 to maintain 60 frames per second progressive scanning, then the definition is improved, but the non-integer ratio between 480p and 720p resolution introduces scaling artifacts
Solution Approach 1:
The patent segments the 720p frame into two distinct regions: a central active area that receives the scaled 480p content and a surrounding border area that is filled with black pixels. This segmentation allows the scaled content to be displayed without forcing it to fill the entire frame, thereby eliminating scaling artifacts while maintaining the higher resolution benefit.
Solution Approach 2:
The patent changes the effective display parameters by reducing the number of active horizontal pixels from 1280 to 960 and adjusting the vertical pixel count accordingly. This parameter change creates a 4:3 aspect ratio display area within the 16:9 720p frame, which matches the aspect ratio of 480p content and eliminates scaling artifacts.
3Object-generated harmful factors
If the number of active lines is reduced inside the higher definition 1280×720 space to reflect the same number of pixels as the original 480p60 image, then scaling artifacts are avoided, but the frame rate may be affected
Solution Approach 1:
The patent segments the 720p frame into two distinct regions: a central active area that receives the scaled 480p content and a surrounding border area that is filled with black pixels. This segmentation allows the scaled content to be displayed without forcing it to fill the entire frame, thereby eliminating scaling artifacts while maintaining the higher resolution benefit.
Solution Approach 2:
The patent performs preliminary action by pre-calculating and pre-allocating the black border regions in the 720p frame before displaying the scaled 480p content. This preliminary preparation ensures that the frame rate is maintained at 60fps while the scaled content is displayed in the central active area without introducing scaling artifacts.
Data Source
AI summary
A method for efficient digital capturing of analog video signals of computer game consoles is provided. The video format of the signal is changed from 480p to 720p, without any scaling artifacts. The number of active horizontal resolution lines and active vertical resolution lines is reduced in the higher definition space, so that the output picture is a pixel-for-pixel transformed replica of the 480p image.