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Revision 18 (Anderson PHILLIP, 10/18/2025 01:35 AM) → Revision 19/49 (Anderson PHILLIP, 10/18/2025 01:56 AM)
{{anchor(Top)}} h1. Multi‑Projector System — Project Wiki IG h2. Overview G11 Members 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. [[#Scope]] [[#Work-Packages]] [[#Team]] h3. Problem background (why blending matters) Overlapped regions become over‑illuminated; alpha‑blending with proper masks evens illumination across seams. (See slides: “What is alpha‑blending?”) [[Alpha‑blending]] h2(#Scope). Scope & assumptions * Start from a *planar* screen with **two** projectors; optical axes *perpendicular* to the screen. [[Members/Phillip-Anderson|Phillip Anderson]] * Work with **still images** first (not video). [[Great Gilbert Soco]] * Expected overlapped area is approximately rectangular; target a *linear* drop of mask intensity from 1→0 across the overlap. [[Members/Yew-Zhi-Jie|Yew Zhi Jie]] * Use Python + OpenCV; iterate from simple to refined. [[Members/Jordan-Keiwein-Lay|Jordan Keiwein Lay]] (From project brief and simplified requirements.) h2(#Objectives). Objectives * Describe the problem and identify a potential solution before coding. [[Members/Amirul Haziq Bin Airol Hairrie|Amirul Haziq Bin Airol Hairrie]] * Apply geometric reasoning (lines/planes in 3D; ray‑plane/ray‑cylinder intersections) as needed. [[Members/Noah-Larson|Noah Larson]] * Prototype masking that yields smooth, artifact‑free blending. [[Members/Sota-Yatsugi|Sota Yatsugi]] (From “Objective”, “Skills required”, and problem formulation.) h2(#Key-Concepts). 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(#Work-Packages). Work packages (WPs) * *WP1 – Geometry & Calibration* Define screen and projector geometry; set initial positions; document assumptions and coordinate frames. Deliverable: short calibration note and diagram. * *WP2 – Overlap Detection* Use forward/inverse ray tracing to detect dual‑illumination pixels on the screen. Deliverable: mask preview images for each projector. * *WP3 – Mask Generation & Blending* Implement linear (then smoothed) alpha masks across the overlap; verify no “scratches” at boundaries. Deliverable: blended still‑image demo. * *WP4 – Experimentation & Evaluation* Record test setups, parameters, and visual results; checklist for “uniform illumination”. * *WP5 – Documentation* Maintain this wiki; Doxygen comments in code; weekly log. h2(#Milestones). Milestones & deliverables * M1: Geometry & calibration draft (WP1). * M2: Overlap detection working on synthetic image (WP2). * M3: Smooth masks + blended demo on screen (WP3). * M4: Evaluation report + next‑step plan (WP4, WP5). h2(#Team). Team & roles (click a name to open their profile) |_. Role |_. Amount |_. Who | | Advisor | 1 | [[Members/Great-Gilbert-Soco|Great Gilbert Soco]] | | PL, Project Leader | 1 | [[Members/Koki|Koki]] | | PM, Project Manager | 1 | [[Members/Noah|Noah]] | | Redmine – supporter of PM | 1 | [[Members/Nonoka|Nonoka]] | | Developers | 2–3 | [[Members/Deng|Deng]], [[Members/Great-Gilbert-Soco|Gilbert]] | | Doxygen Leader | 1 | [[Members/Amirul-Haziq-Bin-Airol-Hairrie|Hachiko (Haziq)]] | | Doxygen, commenters | 2 | [[Members/Jordan|Jordan]], [[Members/Hazel|Hazel]], [[Members/Sota|Sota]] | | Wiki Leader | 1 | [[Members/Great-Gilbert-Soco|Gilbert]] | | Wiki Developers | 2 | [[Members/Zoya|Zoya]], [[Members/Phillip-Anderson|Phillip Anderson]] | | Jira Research Team | 2 | [[Members/Zack|Zack]], [[Members/Phillip-Anderson|Phillip Anderson]] | p=. _Tip:_ create each profile page the first time you click a name. p=. _Back to top:_ [[#Top|↑]] h2(#Alpha-blending). Alpha‑blending (notes) Overlapped areas without masks are brighter; masks weight each projector so the sum equals uniform brightness. Smooth masks eliminate boundary scratches; see examples in the slides. h2(#Links). Project links * Requirements & assumptions: this page, sections [[#Scope]] and [[#Objectives]]. * Design notes & diagrams: (create) [[Design-Notes]] * Experiments log & photos: (create) [[Experiments-Log]] * Code repo / file list: (link later) [[Members/Jiajun-DENG|Jiajun Deng]]