Synthesis Pattern Light for Projector Pixel Mapping
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Solution Overview
Problem
Existing projection technologies require extensive time to determine the relationship between projector pixels and image capture pixels, especially as the number of pixels increases, due to the need for multiple iterations of pattern light projection and capture.
Innovation Solution
A projection control device and method that outputs a synthesis pattern light with multiple light areas of different wave ranges, captured by an image unit, to quickly determine the relationship between projector pixels and image capture pixels, reducing the number of required iterations by synthesizing pattern lights for log 2(X+Y)/3 times, rather than log 2X+log 2Y times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pattern light of gray code is projected and captured using binary searching to determine the relationship between projection pixels and captured image pixels, then the relationship determination is accurate, but the time required increases significantly as the number of pixels increases
Solution Approach 1:
The patent combines multiple pattern lights with different wave ranges (red, green, blue) into a single synthesized pattern light. Instead of projecting separate pattern lights for each color channel sequentially, the system synthesizes all pattern lights into one composite pattern that contains encoding information for all channels simultaneously. This merging approach reduces the number of projection-capture cycles from log2(X) + log2(Y) to log2((X+Y)/3), directly resolving the time consumption problem while maintaining measurement accuracy.
Solution Approach 2:
The patent changes the parameter of pattern light by synthesizing multiple wavelength-range pattern lights into a single synthesized pattern light. The synthesized pattern light contains superimposed encoding information from red, green, and blue pattern lights, allowing the system to encode more information in a single projection. This parameter change enables simultaneous determination of pixel relationships for all color channels, reducing the total number of iterations required.
2Productivity
If multiple pattern lights with different wave ranges are synthesized into a single pattern light, then the time for pixel relationship determination is reduced, but the complexity of pattern light generation and processing increases
Solution Approach 1:
The patent segments the synthesized pattern light into separate color channel components (red, green, blue) based on their different wave ranges. The image capture unit captures the synthesized pattern light, and the system separates the encoding information for each color channel by analyzing the different wavelength components. This segmentation approach allows the complex synthesized pattern to be processed into simple, channel-specific pixel relationship data, resolving the processing complexity issue.
Solution Approach 2:
The patent uses the different wave ranges of pattern lights as an intermediary for separating and identifying encoding information from different color channels. By assigning unique wavelength characteristics to each pattern light component, the system can use spectral analysis as an intermediary process to decode the synthesized pattern light into separate channel information, simplifying the overall processing complexity despite the synthesized input.
Data Source
AI summary
A projection control device comprises a projection control unit, an image acquisition unit, and a corresponding determination unit. The projection control unit outputs a synthesis pattern light to a screen. The synthesis pattern light comprises plurality of pattern light including light area of different wave range from each other. The image acquisition unit acquires a captured image includes the synthesis pattern light which has been outputted to the screen, wherein the captured image is captured by an image capture unit. The corresponding determination unit determines a relationship between projection pixels of the projector and pixels of the captured image of the image capture unit, on the basis of the synthesis pattern light on the captured image.