1 Grenzebach Glier & Associates, Inc. Preliminary Design Review Multispectral Camera Advisor:...

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Grenzebach Glier & Associates, Inc.

Preliminary Design Review

Multispectral CameraAdvisor: Prof. Mario Parente

Team Parente

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Simon Belkin

Audrey C. Finken

Matthew Walczak

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Grenzebach Glier & Associates, Inc.

Team Parente

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Matthew Walczak- EE- Website Master

Simon Belkin- EE- Team

Manager

Audrey Finken- EE

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Grenzebach Glier & Associates, Inc.

Outline The Problem

Background

Our solution

Application

Requirements

Design alternative

Timeline/MDR Goals

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Grenzebach Glier & Associates, Inc.

The Problem

Normal camera just take pictures with RGB color filter that show light at three different wavelengths.

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Grenzebach Glier & Associates, Inc.

The Problem:

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We want to expand the capabilities of normal cameras by covering a wider spectrum of colors through the use of a Multispectral dddddddd33333333333 Camera.

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Grenzebach Glier & Associates, Inc.

Background

The Camera will be operated by a microcontroller system that will position a filter in front of a monochrome camera and an image will be captured

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Multispectral camera: background

Images taken through different optical filter contain only certain wavelengths of the electromagnetic spectrum that the filter allows through.

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Solution: Multispectral Camera

Create picture at different wavelengths that regular vision does not allow(Near Infrared).

Have various applications not accessible by regular cameras.

The provide more information to user.

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Block Diagram

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Applications

Food processing Agriculture

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Defects such as bruising on fruit are more easily isolated in an infrared image.

By studying changes in reflectivity, growers can identify plant stress resulting from problems such as water shortage, nutrient deficiencies, or toxins long before there is any visible indication.

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Requirement Analysis : specifications

Electronically control the filter wheel and monochrome camera attached to it.

Battery powered

Enclosing case big enough to hold monochromatic camera.

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Filter Wheel

This consist of six or more optical band pass filters.

Filter are mounted in a computer controlled filter wheel located between lens and gray level sensor.

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Calibration of color wheel turning to be able to have a particular step size.

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Filter Wheel Challenge: Electronic part

Connection of the filter

− Use logic analyzer

− Use schematic of filter to figure out pins

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Monochromatic camera

Choosing the Monochromatic camera

Photographs images through the filter wheel in particular frequency spectrum.

Camera settings

− Frame rate, latency, exposure, aperture and gain

Enclosed area to prevent light between the Wheel and camera.

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Monochromatic camera challenge :optics

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Aberration:

− Geometric: Each filter is tilted with respect to axis can cause distortion.

− Chromatic : When different wavelengths of light aren't focused on same plane.

− Ghosting: Images produce reflections between the image sensor and filter surface.

Can be solved via software

− Minimize aberration with proper choice of lens and optics

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Microcontroller circuit

Controls the filter wheel’s turning.

Will collect different image spectrums

Include a display mode

− Raspberry pi (tentative)

Microcontroller development board

− Arduino board or chip

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Mechanical assembly

Having all the parts fit together

− Filter

− Optics (lens, camera)

− Microcontroller

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Design alternative: CCD

Using a CCD behind the filter wheel:

Advantages:

− More sensitive to a broad range of wavelengths

Disadvantages:

− Alignment

− Have to deal with optical distortion.

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MDR Deliverables

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ID Task Name Start Finish Duration Oct-12 Nov-12 Dec-12 Jan-13 Feb-13 Mar-13 Apr-13 May-13

1 PDR 10/5/2012 10/15/2012 10 days

2 MDR 10/15/2012 12/6/2012 52 days

3 Mid report 11/8/2012 12/10/2012 32 days

4 CDR 12/6/2012 2/28/2013 84 days

5 FPR 2/28/2013 4/12/2013 43 days

6 SDP Day 2/10/2013 4/19/2013 68 days

7 Final Report 1/22/2013 5/1/2013 99 days

8 Research Filter Wheel 10/8/2012 10/31/2012 23 days

9 Access Filter Wheel with Microcontroller 11/1/2012 12/5/2012 34 days

10 Research Extra Rotating Filter Wheels 10/12/2012 11/1/2012 20 days

11 Obtain Rotating Filter Wheels 11/1/2012 11/25/2012 24 days

12 Research Filter Camera Lens 10/8/2012 11/1/2012 24 days

13 Obtain Camera Lens 11/1/2012 11/20/2012 19 days

14 Research Monocromatic Camera/CCD 10/5/2012 11/1/2012 27 days

15 Obtain Monocromatic Camera/CDD 11/1/2012 11/20/2012 19 days

16 Access Monocromatic Camera with Microcontroller 11/20/2012 12/6/2012 15 days

17 Research Microcontroler 10/10/2012 11/15/2012 36 days

18 Software adjusting for aberations of One Color 11/15/2012 1/22/2013 68 days

19 Software adjusting for aberations of Two Colors 12/6/2012 2/28/2013 84 days

20 Software adjusting for aberations of All Colors available in Filter Wheel 12/6/2013 4/12/2013 127 days

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Thank you for your Time! – Questions?

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