G11-2025

h1(#Top). Multi-Projector System — Project Wiki

h2. Overview

Our goal is to build a two-projector system that displays seamless still images on a flat screen, where the projected areas overlap and must be blended. Implementation is in Python (OpenCV). Prior to implementation, we document the problem and a viable solution approach.

Problem background (why blending matters)  

Overlapped regions become over-illuminated; alpha-blending with proper masks evens illumination across seams. (See [[Alpha-blending]].)

h2(#scope). Scope & assumptions

* Start from a *planar* screen with **two** projectors; optical axes *perpendicular* to the screen.

* Work with **still images** first (not video).

* Expected overlapped area is approximately rectangular; target a *linear* drop of mask intensity from 1→0 across the overlap.

* Use Python + OpenCV; iterate from simple to refined.

(From the simplified requirements.)

h2(#objectives). Objectives

* Describe the problem and identify a potential solution before coding.

* Apply geometric reasoning (lines/planes in 3D; ray-plane/ray-cylinder intersections) as needed.

* Prototype masking that yields smooth, artifact-free blending.

h2. Key concepts & references

* [[Alpha-blending]] — concept and examples.

* Forward (screen→projector) and inverse (projector→screen) ray tracing for overlap detection and mask generation.

* “Smooth” masks prevent scratches along mask boundaries.

h2. Team & roles

|_. Roles |_. Members |

| Advisor | [[Members/Great-Gilbert-Soco|Great Gilbert Soco]] |

| PL, Project Leader | [[Members/Koki-Hamamura|Koki Hamamura]] |

| PM, Project Manager | [[Members/Noah-Larson|Noah Larson]] |

| Redmine – supporter of PM | [[Members/Nonoka-Ohama|Nonoka Ohama]] |

| Developers | [[Members/Jiajun-Deng|Jiajun Deng]], [[Members/Great-Gilbert-Soco|Great Gilbert Soco]] |

| Doxygen Leader | [[Members/Amirul-Haziq-Bin-Airol-Hairrie|Amirul Haziq Bin Airol Hairrie]] |

| Doxygen, commenters | [[Members/Jordan-Keiwein-Lay|Jordan Keiwein Lay]], [[Members/Hnin-Ei-Shwe-Yee|Hnin Ei Shwe Yee]] |

| Wiki Leader | [[Members/Phillip-Anderson|Phillip Anderson]] |

| Wiki Developers | [[Members/Wing-Sum-Tang|Wing Sum Tang]], [[Members/Sota-Yatsugi|Sota Yatsugi]] |

| Jira Research Team | [[Members/Zhi-Jie-Yew|Zhi Jie Yew]], [[Members/Phillip-Anderson|Phillip Anderson]] |

h2. Project links

* Requirements & assumptions: this page — [[#scope|Scope & assumptions]] and [[#objectives|Objectives]].

* Design notes & diagrams: [[Design-Notes]]

* Experiments log & photos: [[Experiments-Log]]

* Code repo / file list: (add link later)

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