Multi-Projector Luminance Uniformity via Feedback Dimming
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Solution Overview
Problem
Existing multi-view screen systems with projection-type image displaying apparatuses face challenges in achieving uniform luminance in the image overlap region due to differing display gamma characteristics, leading to inconsistencies in synthesized luminance.
Innovation Solution
An image displaying system that projects a black image from one projector and a dimmed image from another, with a photography unit capturing the overlap region, a measuring unit assessing the luminance characteristic, and a setting unit adjusting the dimming correction based on the measured characteristic to ensure uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If luminance correction is performed using a predetermined display gamma characteristic, then the luminance correction can be calculated, but the synthesized luminance in the image overlap region becomes non-uniform when the actual display gamma characteristics of the projectors differ from the predetermined value
Solution Approach 1:
The system measures the actual luminance characteristic of one projector and uses this measured value to determine the luminance correction characteristic for the other projector. This feedback mechanism ensures that the correction is based on actual device performance rather than predetermined values, resolving the contradiction between ease of calculation and precision of result.
Solution Approach 2:
Instead of using a fixed predetermined display gamma characteristic, the system dynamically determines the luminance correction characteristic based on the measured luminance characteristic of the projector. This parameter adaptation allows the system to achieve uniform synthesized luminance despite variations in actual device characteristics.
2Manufacturing precision
If the display gamma characteristics of multiple projectors are adjusted to match a predetermined value, then uniform luminance correction can be achieved, but the process becomes complex and time-consuming
Solution Approach 1:
Instead of adjusting both projectors to match a predetermined characteristic, the system measures one projector's actual characteristic and uses the inverse relationship to set the other projector's correction characteristic. This inverted approach simplifies the process while maintaining precision.
Solution Approach 2:
The system uses the measured luminance characteristic of one projector to automatically determine the correction characteristic for the other projector, eliminating the need for manual adjustment of both devices. This self-service mechanism reduces complexity while achieving uniform luminance.
3Measurement precision
If separate measurement and adjustment processes are performed for each projector, then accurate luminance characteristics can be obtained, but the overall process time increases
Solution Approach 1:
The system combines the measurement of one projector with the setting of the other projector's correction characteristic. By measuring only one projector and using the measured value to configure the second projector, the system achieves accurate luminance characteristics while reducing the total measurement and adjustment time compared to separately characterizing both projectors.
Data Source
AI summary
It aims to enable to uniform synthesized luminance in an image overlap region of a projection image by a simple process, by means of a mechanism of: performing display control to project a black image as the projection image to be projected from a first projection-type image displaying apparatus to a screen, and project, as the projection image to be projected from a second projection-type image displaying apparatus to the screen, an image in which dimming correction to the overlap region of the projection images respectively projected by the first and second projection-type image displaying apparatuses has been enabled; measuring a luminance characteristic of the second projection-type image displaying apparatus based on a photographed image obtained by photographing the overlap region; and setting a dimming correction characteristic for the overlap region by the first projection-type image displaying apparatus, based on the measured luminance characteristic.