How to choose the projection blending solution?
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Projection blending technology is designed to achieve image stitching from multiple projectors to achieve ultra-large size, ultra-high resolution, and seamless warping & blending. Its key technologies include geometry warping and edge blending. It is widely used in exhibitions, virtual simulations, immersive theaters and other scenarios, and plays a significant role in the three major display industries (LCD, LED, and projection).
With the development of the times and the progress of the industry, the technology of projection blending is also developing day by day; at the same time, with the increase in user, each user has its own effects that need to be achieved. In order to meet the needs of more users, the technology of projection fusion has also become diverse.
When it comes to the solution of projection blending, some people say it is done with software, some say it is done with hardware, some say it is only achieved with a graphics card, and some say my projector has a built-in blending function...
I believe that many people are confused after reading this. With so many opinions, how are projection blending technologies classified? What are their respective advantages and disadvantages? How to choose them? Next, we will lead you to answer these questions. I believe that after reading this article, your projection blending solution output will be bright and clear at a glance!
Based on the different processing devices used, it is usually divided into the following three categories: software projection blending, hardware projection blending and embedded projection blending. Each function has its own advantages, and different technologies are selected for different scenarios.
一,Software projection blending
Principle:
Rely on the computer CPU or GPU to run dedicated blending software to process the geometric warping and edge blending of the overlapping areas of the projection in real time
Presentation form:
PC + blending software + multi-screen expander + projector
Applicable scenarios:
scenarios with limited budget and low requirements for real-time and synchronization; or scenarios with ball screens or bowl screens.
advantage:
Moderate cost. No special hardware equipment is required, only a projector and a PC are needed. If there are many projections, you can add a multi-screen expander expansion channel. If the requirements are not high, you can choose a more cost-effective fusion software.
High flexibility. Supports multiple screen forms such as flat, curved, bowl screen, ball screen, etc. Ordinary blending software generally does not support ball screen and bowl screen, so you need to choose blending software according to your needs.
shortcoming:
Performance is limited. The display may freeze at high resolutions, occupy a lot of CPU resources, and affect the operation of other programs.
Poor compatibility. Mostly limited to specific file formats (such as video or VR content), and weak real-time signal intervention capabilities
二,Hardware projection blending
Principle:
Use dedicated hardware devices (such as FPGA chip blending processors) to independently process signals to achieve geometric warping, color correction and edge blending
Form of expression:
PC + hardware blending + projector
Applicable scenarios:
large control rooms, monitoring centers, and other scenarios that require high reliability and multi-signal access
advantage:
Strong compatibility. Supports multi-channel signal input and real-time processing without delay
High stability. Pure hardware architecture, no risk of system crash, supports 24/7 operation
shortcoming:
Higher cost. Dedicated blending devices are more expensive (especially plug-in card devices or devices that support high resolution)
Low flexibility. The surface correction capability is limited. For example, scenes such as bowl screen and ball screen are not as convenient as software blending.
三,Embedded projection blending
Principle:
Through dedicated embedded (such as Android, Linux, Kirin and other systems) hardware devices (based on SoC fusion processors such as Rockchip and HiSilicon), it integrates playback, splicing and blending to achieve functions such as geometric warping, color correction, edge blending and video playback.
Display form:
embedded blending device + projector
Applicable scenarios:
small and medium-sized integrated projects with fixed installation (such as corporate exhibition halls) that pursue system simplicity
advantage:
Low cost. One device replaces the computer, splicer, and blending software, with high integration, and the overall cost is also reduced
Simplify the system. No external blending device and input source are required, which reduces the model transmission link and reduces the delay.
High flexibility. All kinds of bowl screens, ball screens, and curved surfaces can be applied (depending on the specific software support)
shortcoming:
Asynchronous playback. Internal decoding playback, if external signal is needed, it can only be played through signal acquisition
Performance is limited. Different products have different decoding capabilities, and the display is prone to lag at high resolution and high refresh rate.
Simply put, if you have high requirements and sufficient budget, choose a hardware projection blending; if the budget and requirements are relatively moderate, choose a software blending; if the budget is not high and the input source does not change frequently, you can consider an embedded projection blending.
The above is purely personal opinion. If you have different opinions, you are welcome to discuss. If you have project requirements, you are also welcome to discuss and consult. We will recommend the best solution to you!
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