Edge Blending processor
It depends on many factor. Usually, 20% to 40% is recommended. This resolution is calculated from the pojector native resolution. The image size will be also one of the major factor. The projection image size from the projector will be determined by the native resolution. For example, WUXGA image is 16:10 and Full HD is 16:9. If user requires 3m image height, then the minimum projection image width will be 3/10*16=4.8m. When the screen size is 8m width, then the overlap region will be 4.8*2-8=1.6m width. it will be 33.3% overlap ratio. If user wants to keep 20% overlap ratio, the image size for each projector will be 4.44m*2.78m. It means the maximum image height will be only 2.78m but not 3.0m. The overlap region will be 0.88m.
In summary, the overlap region is not a fixed number, user can have higher image and use GeoBox geometry alignment to draw the image to the required height but can't enlarge the image beyond projector optical range. It can be drawn back but not extended to outside.
Below are the advantages to add pure hardware edge blending system:
- User can connect with all kind of signal sources with hardware edge blending system and there is no limitation in the source resolution.
- Avoid Synchronization issue among channels.
- Able to do system setup through remote controller or keypad without PC system. Lower the entry barrier for simple project implementation.
- Convenient after service with low cost: Projection position shift will occur due to material deformation, thermal issue, installation, lamp change and earth quake ...etc. User can use remote controller to shift the image back to original locations within few seconds. On the contrast, PC system requires specific software and dedicated person to do it.
- Software system requires high end PC. Usually End user needs to buy service package after installation. Once PC breakdown or OS change, user may need to pay extra charges for software installation. In general, PC software system requires more cost for long term operation.
- More flexible and easier for image cropping, aspect ratio adjustment and curved alignment.
- Easy to reach high system resolution through multiple input signal sources or low cost synchronized media players.
- Flexible display: Three types of flexible display for 3 projector edge blending:
- One edge blended image across three projectors.
- Two edge blended image plus one independent image.
- Discrete images in each projector.
The setting can be stored inside the Box and recalled at any time.
- Scheduling and content control can be implemented through low cost Android media player or IP media
- Easy to have PIP/POP with multiple external signal sources.
- No windows OS update issue.
- For school application, the teacher can use his own Notebook PC freely. No need to use the same PC and get trouble for virus issue.
- Simple hardware structure, more reliable and longer life time.
- No hacker or virus issues.
The projector should have good gamma correction and accurate color to avoid the difficulty in image quality fine tune. Usually, commercial projector above 5000 Lumens from famous brand names should be OK to use.
If the environment is in dark room, user needs to select a higher native contrast ratio projectors to reduce the banding issue in the overlap region due to projector optical light leakage. Usually, DLP projector will have higher native contrast ratio than LCD projector. This contrast ratio should be NATIVE but not DYNAMIC contrast ratio.
The life of the lamp is important for public display for long hours. Conventional lamp will last for 3000-4000 hours and Laser can last for 20,000 hours. User needs to choose based on the application and the budget.
If user wants to increase the image height, to do portrait direction edge blending should be considered. In this case, user need to select laser projector. Conventional projector will shorten the life time if it is installed at portrait direction.
If the screen is curved, user needs to consider the throw ratio of the projector. Short throw ratio will cause more image distortion although the installation distance can be shorter. The image distortion should be controlled under 30% to get good text quality. Ultra-short throw ratio will cause too much image distortion. It is not recommended for curved screen applition.
Most of Laser projector has accurate color with high contrast ratio. It should be the best choice for edge blending application.
VNS has provide prodct selection guide for each application category--edge blending, video wall, multiple function video processor. Please check the Product Tab to find out more details.