1 / 16

ColourIt

ColourIt. Reveals True Colours. Members of CoulorSense Inc. Julie Chao, CEO Linda Ni, Project Manager Bill Yang, CTO. Introduction of ColourSense Inc. Reveals True Colours. Overview. ColourIt Background and Advantages System Overview Functionality Design and Reasoning

saddam
Download Presentation

ColourIt

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ColourIt

  2. Reveals True Colours • Members of CoulorSense Inc. • Julie Chao, CEO • Linda Ni, Project Manager • Bill Yang, CTO Introduction of ColourSense Inc.

  3. Reveals True Colours Overview • ColourIt • Background and Advantages • System Overview • Functionality • Design and Reasoning • Final Stage Prototype • Usability and Reproducibility • Different Applications • Difficulties Encountered • Future Work and Conclusion

  4. Reveals True Colours Vision Background • Visual System in Human Eye • Retina: contains light receptors • Rods • Cones that absorbs red light (long-wavelength) • Cones that absorb green light • Cones that absorb blue light (short-wavelength)

  5. Reveals True Colours Colour Model and Colour Space • A colour model is an abstract mathematical model describing the way colours can be represented typically as three or four values or colour components. • RGB (addictive colour mixing) and CMYK (subtractive colour mixing) are colour models. • sRGB, Adobe RGB, HSV (hue, saturation, intensity) are colour spaces. addictive subtractive Colour Background

  6. Reveals True Colours White LEDs Colour Sensing Unit Central Control Unit User Interface Unit RGB values Reflected light 255, 0, 255 Colour Sensor Micro-controller LCD Screen Area of Interest Introduction of ColourIt Block Diagram of Overall System

  7. Reveals True Colours Power Specifications • System Requirement: • Input 5.0V, load current 60mA • Solution: • Input 9.0V, output 5.0V • +5V voltage regulator: LM341 (needs min 7.2V) • Battery: 9V, 625mAh (25X16X44mm) • Advantage: easy to implement, easily accessible battery • Cost: $4 battery, $1.50 chip

  8. Reveals True Colours Sensor Unit Specifications • White light must be evenly distributed • 4 LEDs centred around sensor • Dimensions: 20-25mm in diameter 13 mm height

  9. Reveals True Colours Power on Initialization Hold more than 2 seconds? Sample? Y Y N N Sample and display RGB values of colour on LCD White calibration Toggle? Y Y N N Enable or disable illuminating LEDs Black calibration Operation Flow Chart Hold more than 2 seconds?

  10. Reveals True Colours Purpose of White & Black Calibration Output Frequency Ideal Fwhite Colour Seen by Sensor = Fwhite Inner Wall Colour of Tube Colour of Target Surface + Fblack Ideal Fblack Wavelength

  11. Reveals True Colours Delta X 255 B = • Same Calculation for R and G • Uncertainty = Range + 1 _ Coversion to RGB Fwhite Output Frequency Range Fsample Delta Fblack Wavelength

  12. Reveals True Colours Correction Matrix X = M · T X = The corrected RGB values M = 3X3 correction matrix T = RGB values measured by ColourIt M can be approximated by using fminserch() function in Matlab to find the optimum correction matrix that minimize the sum of the root mean square errors of each RGB pairs in the X and T matrix Colour Checker

  13. Reveals True Colours Colour Standards • Book: Color Harmony by Cailin Boyle • Problems: Inconsistency, inaccuracy • Printing always effects actual colour • Better: ColorChecker checkerboard • 24 scientifically prepared colors • Objects of special interest (skin, foliage, sky) • Reflect light same way • Colours match natural objects under any illumination and with any color reproduction process

  14. Reveals True Colours Desired Packaging • Original vision • Desired dimensions: less than 120X40X30 mm (body) • Light, portable, compact • Make use of existing parts • Pipes, flashlights, tubes, switchboxes, conduit bodies

  15. Reveals True Colours Final Packaging • Used conduit body: E986D • Features: • Plastic • 20 mm entry hole • Removable lid • Body dimensions: 77X27X26 • Problems: • Barely enough space • Next size, E986E, triple of E986D • Solution: milled out interior

  16. Reveals True Colours Pink 255,192,203 Violet 238,130,238 Magenta 255,0,255 Purple 128,0,128 Blue 0,0,255 Navy 0,0,128 Cyan 0,255,255 Lime 0,255,0 Yellow 255,255,0 Orange 255,165,0 Red 255,0,0 Brown 165,42,42 Maroon 128,0,0 White 255,255,255 Gray 128,128,128 Black 0,0,0 Demonstration

More Related