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Gesture Identification Based Remote Controlled Robot

Manjusha Dhabale1 and Abhijit Kamune2
  1. Assistant Professor, Department of Computer Science and Engineering, Ramdeobaba College of Engineering , Nagpur, India
  2. Assistant Professor, Department of Computer Science and Engineering, Ramdeobaba College of Engineering , Nagpur, India
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Abstract

Gestures provide a rich and intuitive form of interaction for controlling robots. This paper presents an approach for designing and controlling a mobile robot with hand gestures. Designed and assembled two drive wheel controllable Robot with Zigbee Transceiver. Communication medium. The embedded executable are designed and developed for five directional command codes (for right motion, left motion, forward motion, backward, and to stop). The assembled architecture performed the desired activities based on the commands with a tolerable response time. Hand gesture recognition system has been developed based on statistical measures like mean, variance, skewness, and kurtosis as a feature set using CART model. Apt preprocessors have been employed cropping, segmenting, binarization. It is observed that this classifier is robust with respect to usage of hand and mode of hands like front or back side of hand. To evaluate the system the gesture data has been acquired from set of students. The gesture classifier10-fold validation performed 90% accuracy.

Keywords

Human-Robot Interaction (HRI) Embedded Systems, Computer Vision, Hand Gesture, Feature Extraction, Classification.

INTRODUCTION

Gestures are a powerful means of communication among humans. In fact, gesturing is so deeply rooted in our communication that people often continue gesturing when speaking on the telephone. Hand gestures provide a separate complementary modality to speech for expressing ones ideas. Information associated with hand gestures in a conversation is degree, discourse structure, spatial and temporal structure. So, a natural interaction between humans and computing devices can be achieved by using hand gestures for communication between them. The key problem in gesture interaction is how to make hand gestures understood by computer. Human-Robot Interaction (HRI) can be considered as one of the most important Computer Vision domains. It has many applications in a variety of fields such as: search and rescue, military battle, mine and bomb detection, scientific exploration, law enforcement, entertainment and hospital care.HRI is the study of interactions between people and robots.

II. RELATED WORK

A survey of existing works in this field is found in [1 2 3 4].Each having strengths and weaknesses, where hidden markov models [4] and some neural networks [1] methods were used for gesture recognition. Where 70-75 % accuracy was found.
In our present work, we intend to design and develop mobile robot system. Such that, Fig 1 shows the web camera connected to the Central Processing System, captures the object (gesture) image. The Central Processing System processes those images to generate command and sending the command through wireless media so that robot will move according to gesture.

III. SYSTEM DESCRIPTION

The overall system is divided into five different phases. Fig 2 shows the basic block diagram of all phases.
1. Robot Design: The main aim is to design a robust robot in low cost, with high reliability as well as with minimal response time, which can server for Human-Robot Interaction. This Phase mainly deals with hardware portion of our System, where we have designed a robot using electronic and electronic hardware such as: AVRatmega32 microcontroller to program robot, motor controller, actuators, vision sensors, low power XBee ZB RF transceiver modules to send the command generated from central system to robot, rechargeable battery, wheels, aluminums chassis etc [5 6 8].
2. Image Input Phase: Here camera is used to take image of object (gesture).
3. Gesture Identification Phase: Output of 2nd phase i.e. an image is taken as input for this phase. This phase concentrates on image processing, where gestures are recognized and processed by central processing system.
4. Robot Control Phase (Control Command Generation): Once gestures are recognized by central processing system, commands are generated transmitted through zigbee to the robot system.
5. Robot Mobility Phase: (The embedded controller decodes the received command from central computer and drives the robot into one the direction among the five movements given below. According to received command, motor drive and robot has to move in one of the following (the present work confines to following 5 directions as shown in Fig 3.):
a. Forward move, b. Backward move, c. Left turn, d. Right turn, e. Stop

IV. PROPOSED METHOD

An overview of proposed approach for Gesture Identification:
A Human gesture captured by camera attached to the central processing system will be taken as input to Gesture Identification System (GIS). This Image naturally will be a color image. The GIS system follows schematic procedure of Image Process.
1. Preprocessing: To improve the performance of gesture identification (GI) image preprocessing such as
a) Removal of noise.
b) Discovery of Region of Interest (R.O.I).
c) Clipping of the ROI portion of gesture image (GI) shown in Fig 4. (b).
are used.
2. Binarization: By adopting optimal threshold schemes GI will be Binarized
Binary Gesture Image (BGI):
Algorithm Binarization Input: Color image Output: Segmented Black and White Image
1. Convert Color image into gray-scale image.
2. Choose adaptive threshold value.
3. Apply threshold value on gray-scale image.
4. Black and White image.
3. Histogram: Using BGI is a two dimensional array of Zeros and Ones. Number of ones per each row of the array indicates the frequency of gesture pixels in ROI. This collection of frequency is the distribution of Gesture pixels over the row which is referred as row Histogram. Similarly one can have Colum referred as Colum Histogram. By using these two histogram get two different postures of hand gesture [7] as shown in Fig 5. (a) and (b) resulted column and row wise histogram of forward move.
Algorithm Histogram Input: Binary Image Output: Row-wise and Column-wise histogram
1. Get size of input image (in number of rows and columns).
2. For each input image i .
3. For each column j.
4. Count number of black/white pixels.
5. For each row k.
6. Count number of black/white pixels.
7. By using results of step 4 and step 6, draw histogram
4. Feature extraction: Proposed a new method to recognize/classify the gesture. The Histogram derived from the above are assumed to possess the information regarding the gesture, thus the characteristics of histogram are expected to capture the inherent characteristics of the gesture. Thus the popular statistical characteristics of a histogram like the Mean, Variance, skewness, Kurtosis are considered here as feature values for the given gesture. Thus the feature set for a given gesture will have ROI parameters, that is (X0 , Y0 ) and (X1,Y1) the two corners of ROI rectangle, mean, variance, skewness, Kurtosis for Row Histogram as well as for the column Histogram, put together 8 values. Hence the feature vector will have 12 numerical values ( 2+ 2 + 8) Constituting 12-dimensional real feature vector. The gesture signals are move forward, backward, left turn, right turn or to stop and are realized by using these statistical features. We have used matlab tool to compute these statistics.
Let fx be the frequency at x(=1,2,…,k) of a random variable X
Eq (2)
And let
Eq (3)
Eq (4)
Eq (5)
Eq (6)
Eq (7)
Eq (8)
Here
Considering x as a Row index and corresponding number of black pixels as fx, we have calculated above four statistical measures and similarly column index as x and the corresponding black pixels as fx, we have calculated four statistical measures and considered them as a feature set.
5. Gesture classification: These hand gestures are highly influenced by the human, the one providing the gestures, like using right hand or left hand, front or back, straight or curved, skewed orientation etc. This makes the identification of the gesture direction highly complex. In addition to this the influence of elimination and shadow of the hand postures makes this gesture classification further complex.
The intent of the classification process is to categorize all gesture for their corresponding directions. Here we have five different gestures to classify. Based on above calculated features for example mean, variance, skewness, kurtosis, cropped image positions, we have categorized the gestures(which signals: forward, backward, left, right stop motion of the robot).
Experiment are conducted by collecting gesture signals of several students (mix of male female students shown in table 1) giving them total freedom to make their gestures. The image is tagged with their corresponding directions. This wrapped data has been used for building rule based system for gestures, by adapting supervised learning philosophy
To classify the data we have used Weka data-mining classification tool. Taking sample of many gestures and getting above feature data, we have divided data set into training and test set. Based on training data set, we have developed a classification model to predict the gesture direction. There are many classification algorithm options provided by the tool like SimpleCART, ID3, tenfold validations, Neural Networks etc. We have done many experiments on data set; the CART classification model has given good accuracy (89-90 %) and less error. Hence we have adapted CART.

V. SIMULATION RESULTS

The following table 1 shows classified computed values of mean using Eq (3), variance Eq (4), skewness Eq (7), kurtosis Eq (8) etc of different hand gestures which are collected in our lab and processed to control the robot.
Where,
X is used for column-wise histogram, Y for row-wise histogram, s for skewness, k for kurtosis, min., and max. X Y for cropped image positions, G gesture where 1 is code considered for backward move, 2 for forward, 3 right, 4 left, 5 stop).

Robot Control Phase

Gestures to commands mapping
Obtaining the input from image processing unit regarding gesture classification we need to map the motion direction to a command code and to generate motion command for the Robot. The command code can be move forward, backward, take right turn, left turn or to stop the robot. The generated command is used to control the motor rotational speed. If it is left turn or right turn the motors will rotate in opposite directions. Fig 6 shows the flowchart of gesture to command mapping, where according to classified gesture command codes are generated and sent to the robot.

Mapping of Received command to Robot Movement

At robot system end, received command code is taken as input, decoded by the control program. The control program is written into the robot's microcontroller flash memory. The control program generates sequence of actions according to the decoded instruction. These generated sequences of actions are executed at actuators and motors levels to realize desired motion

Experiment / Demonstration

The robot we have developed is shown in Fig 7.
Mobility at Robot End
A. Receive the command code.
B. Fetch the command corresponding to the command code.
C. Command is decoded and control signals are generated to move the robot according to received command code.
Experiments taken at lab are shown in Fig 8.

VI. CONCLUSION AND FUTURE WORK

In this paper we have successfully assembled all of above mentioned hardware, for building the Robot system. Images are used as the input for hand gesture detection. We have come-up with new-approach to recognize and to classify the gestures using mean, variance, skewness, kurtosis, values of binary image histogram. Classification and recognition is used as an interface for sending the command code to robot. The above method is giving 90% accuracy of hand gesture direction detection.
The scope of the present work is limited to hand gesture detection, future scope is to track moving objects..

Tables at a glance

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Table 1
 

Figures at a glance

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Figure 5 Figure 6 Figure 7 Figure 8
 

References