development of image processing based feedback systems for interactive gaming using non-traditional...
TRANSCRIPT
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Adam HedjiMantas PulinasPhilip SanIII. Viktorious
SSIP 2009, Debrecen, Hungary
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Project NatalX-Box 360Microsoft Corporation
Full Body Motion Detection
New project that promises to use two
cameras for full-body motion detection
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
CHECKERS!
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Overview of Code
Board Plane Geometry Detection
Board Plane Geometry Detection
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Overview of Code
Relaying of Data with Checkers A.I.
Relaying of Data with Checkers A.I.
FeedbackFeedback
Identification of Square Status by
Colour Classification
Identification of Square Status by
Colour Classification
Segmentation of Individual Game
Squares
Segmentation of Individual Game
Squares
Board Plane Geometry Detection
Board Plane Geometry Detection
This is blue!This is blue!
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Geometry Detection
• Find the corners
• 2 approaches were used:• Edge
detection and region growing
• Hough transforms
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Geometry Detection – Edge Detection and Region Growing
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Geometry Detection – Edge Detection and Region Growing• Edge detection with Sobel
operator• Dilate the image to fill the
gaps in the border
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Geometry Detection – Edge Detection and Region Growing• Edge detection with Sobel
operator• Dilate the image to fill the
gaps in the border• Thin the image to get the
true border
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Geometry Detection – Edge Detection and Region Growing• Edge detection with Sobel
operator• Dilate the image to fill the
gaps in the border• Thin the image to get the
true border• Dilate the image several
times to remove useless edges
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Geometry Detection – Edge Detection and Region Growing• Edge detection with Sobel operator• Dilate the image to fill the gaps in
the border• Thin the image to get the true
border• Dilate the image several times to
remove useless edges• Region growing• Determine the corner tiles• Track corners in real-time
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Geometry Detection – Projective Correction• Edge detection with Sobel operator• Dilate the image to fill the gaps in
the border• Thin the image to get the true
border• Dilate the image several times to
remove useless edges• Region growing• Determine the corner tiles• Track corners in real-time
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Geometry Detection – Projective Correction
Calculate homography using corner coordinates
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Geometry Detection – Hough Transform
• Hough transform– We had time so we developed a better
solution– Based on Hough transformations– Better real-time line detection
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional ControllersDevelopment of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Colour ClassificationHow can the computer classify the colours?
(171,154,158)(171,154,158)
(32,61,105)(32,61,105)
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Colour ClassificationUse image processing algorithms to make the RGB values only 0 or 255
(255,255,255)(255,255,255)
(0,0,255)(0,0,255)
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Colour Classification
(255,255,255)
(0,0,0)
(255,255,0)
(0,0,255)
•Select individual tile
•Analyse the predominant colour inside to classify the square state (white, black, blue, yellow)
•Sample of pixels used as opposed to whole square
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Colour Classification
•How to determine if each R, G and B values are 0 or 255?
-Need to choose threshold value
e.g.A given pixel of value (15, 19, 250)A threshold of 126Output is (0,0,255)
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Colour Classification - But how to choose the threshold?• Webcams can be of relatively poor quality and
provide poor contrast.– For example, blue pieces used were relatively
hard to distinguish from the black tiles.
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional ControllersDevelopment of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
But how to choose the threshold?
• Can instead normalise the image and use a threshold of 127, given by (256/2)-1.– Select a white tile and take
an average of the colour values.
– Do the same for a black tile.– Use these averages to
normalise the image
p1=(241,209,210)
p2=(232,204,214)
p3=(240,211,205)
BlackWhite
BlackInputBGROutput
),,(
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Colour Classification - Normalisation
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Colour Classification - Normalisation
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Colour Classification - Normalisation
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Colour Classification - Normalisation
• Then reduce the image to absolute values of 0 and 255
• Use a threshold of 126 (half of full intensity value)
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Colour Classification - Normalisation
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Colour Classification - Normalisation
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Summary
• Main results– Successfully used 2 approaches to chess
board detection• Edge detection and region growing• Hough transform
– Removing perspective distortion– Identification of individual tiles and pieces,
including classification– Connection to engine interface with feedback
system
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Improvements
• Aim towards real-time 60fps processing• Use a more efficient programming language
such as C++• Use of GPU using CUDA or Open CL
programming language• More complex algorithms
– Motion detection of hand• Use of overlay of 3D structures onto camera
image.• Virtual humans...
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
Unused Virtual Human
Development of Image Processing Based Feedback Systems for Interactive Gaming Using Non-Traditional Controllers
The Team
Adam HedjiUniversity of Zagreb, [email protected]
Mantas PaulinasVilnius Gediminas Technical University, [email protected]
Viktor BlaskovicsUniversity of Szeged, [email protected]
Philip SanUniversity College London, [email protected]