Double Stacked Projection Image Processing Circuit
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Solution Overview
Problem
Traditional double stacking of projectors for increasing brightness in high-resolution applications, such as giant screen cinemas, faces challenges due to alignment difficulties caused by thermal movements and vibrations, leading to image quality issues like speckles and banding artefacts, and requires high maintenance.
Innovation Solution
An image processing circuit with thresholding limiters and constrained smoothing filters splits a source image into two images that, when projected overlaid, form an image identical to the source image but with reduced high-frequency components, improving alignment tolerance and image quality while reducing equipment costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional double stacking is used to increase brightness, then light output is doubled, but alignment precision deteriorates due to thermal movements and vibrations
Solution Approach 1:
The invention segments the image processing by applying different operations to different frequency components. High-frequency components (edges, details) are processed with one algorithm while low-frequency components (smooth areas) use another algorithm, allowing each to be optimized independently for the double-stacking context
Solution Approach 2:
The invention changes processing parameters dynamically based on image content. By detecting edges and high-frequency regions, the system adjusts processing intensity and method locally, applying stronger correction to high-frequency areas that are more sensitive to misalignment while using gentler processing on low-frequency areas
2Illumination intensity
If traditional double stacking is used for 4K projection, then brightness is increased, but image quality deteriorates due to speckles and banding artefacts
Solution Approach 1:
Instead of trying to prevent artefact formation, the invention inverts the approach by detecting where artefacts are likely to occur (banding regions, speckle-prone areas) and applying corrective processing to those specific regions. The system identifies problematic areas and针对性地 applies processing to eliminate or reduce the artefacts
Solution Approach 2:
The invention converts the harmful effect of thermal movements and vibrations into a benefit by using the knowledge of where misalignment occurs to selectively apply processing. Rather than treating all areas uniformly, the system identifies regions most affected by misalignment and applies enhanced processing only there, turning the problem of selective misalignment into a targeted solution
3Illumination intensity
If traditional double stacking is used, then brightness is doubled, but maintenance requirements increase due to alignment sensitivity
Solution Approach 1:
The invention implements self-service through automatic processing that continuously adapts to changing conditions. The system automatically detects misalignment, identifies affected regions, and applies corrective processing without requiring manual intervention or realignment, effectively making the system self-correcting and reducing maintenance burden
Data Source
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AI summary
A method for producing a first output image and a second output image for being projected by a first projector and a second projector, respectively, is disclosed. The method comprises: providing a source image comprising a plurality of pixels, each pixel having a source value, providing a threshold value and an inverted threshold value for each pixel of the plurality of pixels, and generating there from a temporary image comprising a temporary value for each pixel of the plurality of pixels. The method further comprises generating the first output image comprising a first output value for each pixel of the plurality of pixels, the first output value being generated from the temporary value and the source value for each pixel, and generating the second output image comprising a second output value for each pixel of the plurality of pixels, the second output value being generated from the temporary value.