Projector Crosstalk Suppression via Sequential Image Capture
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Solution Overview
Problem
Existing projector technologies face issues with crosstalk between frames before and after the projection image during image capturing, which disrupts the reproduction of the captured image and introduces noise.
Innovation Solution
A projector system that includes an image forming unit, a projection unit, an image capturing unit, and a detection unit, where the image capturing unit starts sequential image capturing from a region of the projection surface where the projection image switching is completed, and performs image capturing during periods when the projection image switching is not occurring, thereby minimizing crosstalk and allowing for background removal processing to detect objects accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the projection image is switched during image capturing, then the image capturing can be performed continuously, but crosstalk occurs between frames before and after the projection image
Solution Approach 1:
The patent applies preliminary action by having the image capturing unit start capturing from a region where projection image switching is completed before the switching actually occurs. This timing arrangement ensures that the capturing region is already stable and will not experience crosstalk during the switching transition, thus maintaining both continuous capturing and high accuracy.
2Speed
If the projection image switching is performed during image capturing, then the projection can be updated in real-time, but noise is introduced into the captured image
Solution Approach 1:
The patent segments the projection surface into multiple regions and divides the image capturing process by region. By capturing each region separately and coordinating with projection switching timing, the system maintains real-time projection updates while avoiding noise introduction in the captured images.
3Device complexity
If the captured image and projection image are stored in frame memory with coinciding timings, then the processing can be simplified, but crosstalk between frames occurs
Solution Approach 1:
The patent uses preliminary action by pre-coordinating the timing between projection switching and image capturing. The image capturing unit is configured to start capturing from regions where switching is completed, which proactively prevents crosstalk before it can occur during the capturing process.
Data Source
AI summary
A projector includes an image forming unit, a projection unit, an image capturing unit, and a detection unit. The image forming unit generates projection image data based on a video signal. The projection unit projects a projection image based on the projection image data, on a projection surface. The image capturing unit generates captured image data by capturing an image of the projection surface for each line or for each block. The detection unit detects an object other than the projection image, which included in the captured image data, based on the captured image data and the projection image data. The projection unit switches projection image for each line or for each block, by scanning. The image capturing unit starts sequential image capturing from a region of the projection surface, in which switching is completed, during a period when at least switching of the projection image is performed.