P16551: Observer Calibrator
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Problem Definition

Table of Contents

Team Vision for Problem Definition Phase

We met with Dr. Fairchild (our customer), and asked our first interview questions. You can view the Q/A here.

Next, our mock Problem Definition review is on Tuesday, February 9. A copy of the presentation slides can be viewed here.

Project Summary

An Observer Calibrator (OC) is an instrument designed to measure and distinguish differences in human color perception. The instrument should have a split optical field with two arrays of at least 4 independent LEDs, the capability for an interchangeable optical front end for color stimulus presentation, a robust computer interface for researcher interaction and be designed in such a way that transportation of the instrument is possible. A prototype of the OC was developed by Technicolor in Rennes, France, but currently illumination levels are not high enough and the instrument is not portable.

The goal of this project is to analyze the current prototype and develop a working model of the instrument. By analyzing the existing instrument, the team will be able to identify design changes or requirements that will make the instrument meet each of the given requirements: Brighter, easier to use, somewhat portable, and allow for interchangeable optical presentation. The expected end result is an Observer Calibrator to be used in future RIT color science research. In addition to performing its intended functions, the OC must comply with RIT and FDA regulations and guidelines.

Use Cases

See here for our initial drafts of Customer Needs and Use Cases.

After meeting with our customer, Dr. Fairchild, we updated our Use Case Scenarios and list of Customer Requirements. There are two main variable aspects of the device's use. The first is whether the researcher carries the device to a location to test the observer or has the device already set up in a lab which the observer visits to perform the test. The second is whether the observer adjusts the second color to match it with the first or whether the researcher cycles through preset second colors and asks the observer which is the best match. Below are snapshots of the anticipated use cases for the Observer Calibrator.

Case 1: Calibrator Is Not Moved, Researcher Cycles Color

Case 1: Calibrator Is Not Moved, Researcher Cycles Color

Case 2: Calibrator Is Not Moved, Observer Adjusts Color

Case 2: Calibrator Is Not Moved, Observer Adjusts Color

Case 3: Calibrator Is Moved, Researcher Cycles Color

Case 3: Calibrator Is Moved, Researcher Cycles Color

Case 4: Calibrator Is Moved, Observer Adjusts Color

Case 4: Calibrator Is Moved, Observer Adjusts Color

Project Goals and Key Deliverables

By the end of this project, we will have delivered a functional Observer Calibrator to Dr. Mark Fairchild of RIT's Program of Color Science. This device will be available for research use, and will be robust and portable enough to be transported. The interface to the Observer Calibrator will be intuitive and accessed through MATLAB.

Customer Requirements (Needs)

Below is a screenshot of our Customer Requirements. These were developed further after our interview with Dr. Fairchild.

Snapshot of the Customer Needs

Snapshot of the Customer Needs

A link to the live Requirements and Testing document is given here

Engineering Requirements (Metrics & Specifications)

Below is a screenshot of our current Engineering Requirements. These are the engineering-related measures by which we will judge our Observer Calibrator design. The engineering requirements are also located within the Requirements and Testing document.

Engineering Requirements

Engineering Requirements

Constraints

Factors, usually system-level, that limit your design space (e.g., cost, total weight, total footprint, total power available). Are your constraints measurable and testable, and can they be traced back to customer requirements? Have you considered economic, environmental, social, political, ethical, health and safety, manufacturability, and sustainability constraints and engineering standards, for example?

House of Quality

The House of Quality is also located within the Requirements and Testing document. This maps our customer requirements to our engineering requirements.

House of Quality

House of Quality

Design Review Materials

Our Design Review took place on Tuesday, February 9. A copy of the presentation slides can be viewed here.

Plans for next phase

For our next phase, we are currently working on the System Design Review which will take place on Tuesday, March 1.

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