FACE DETECTION USING SKIN COLOR SEGMENTATION
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1 FACE DETECTION USING SKIN COLOR SEGMENTATION Gayatri A.Patil 1, K.V.Joshi 2 1,2 Department of Electronics and Telecommunication, R.C. Patel Institute of Technology, Shirpur, Dist,-Dhule, MS, (India) ABSTRACT Face detection is used to locate faces in images. This algorithm has a simple procedure which is divided into two steps, first to segment image into skin color regions, and second, to divide this regions contain human face or not.it uses RGB model in combination with HSV model and fuzzy classifier to quickly locate faces in images. The algorithm is based on skin color segmentation and knowledge based approach, RGB and HSV color models are used for skin color segmentation. Basically, this color models are used to remove non-skin like pixels from an image. Each skin region is actually represents a human face or not, checked by using human face features based on knowledge of geometrical properties of human face. The experiment result shows that, the algorithm gives satisfactory output. Keywords: Fuzzy Model, HSV Model, Skin color Segmentation I INTRODUCTION Face detection is technology to determine human face in videos and images. The aim of face detection is to detect faces in images in videos. This is the first step in many applications such as face recognition, facial expression analysis, content based image retrieval, surveillance system and intelligent human computer interaction. Therefore, the performance of these systems depends on the efficiency of face detection. Face detection is an easy task for a human, but still there is difficulties as faces are subjected to lots of variations of image appearance, such as pose variation (front, non- front), occlusion, image orientation, illumination and facial expression.in the early stage, face detection algorithms mainly focused to detect the frontal human face. However,newer algorithms try to consider the different view of face as core of face detection. The first of face detection system has been developed since in early 1970 s. Due to the limitation of computation, system cannot be satisfied the requirement of users, which is identify passport photograph real time. Face detection is an important part of face recognition as it is the first step to any automatic face recognition system [1]. Many methods have been implemented to resolve each variation.. For example, template-matching methods [2] are used for face localization and detection by computing the correlation of an input image to a standard face pattern. The feature invariant approaches [3] are used for feature detection of eyes, mouth, ears, nose, etc. and appearancebased methods are used for face detection with edge detection [4] and neural networks [6]. Many several face 19 P a g e
2 detection algorithms that are use neural networks, and support vector machine [3]. For color images, various literatures have shown that is possible to separate human skin regions from complex background based on either YCbCr or HSV color space [5]. Nevertheless, implementing the methods altogether is still a great challenge. II SKIN COLOR SEGMENTATION Color is a useful piece of information for skin detection. The skin detection is the most common and first approach for detecting meaningful skin color, skin color detection may avoid exhaustive search for faces in an entire image. In this step, we describe that how non skin color is rejected from an Image so that the image may contains only skin like areas, which will be our skin color segmented image for further processing. The goal of skin color segmentation is to reject non-skin color regions from the input image. It is based on the fact that the color of the human face across all races agrees closely in its chrominance value and varies mainly in its luminance value HSV model has the best performance for skin pixel detection as compared to chrominance(ycbcr) model and RGB model. In the HSV color model, H means for hue component, which describes the shade of the color, S stands for saturation component, which describes how pure the hue (color) is while V stands for value component, which describes the brightness. Fig.1 The Flowchart of Face Detection Algorithm First problem is come in the way of face detection, is chosen proper color model for skin color segmentation. There are several color models and each has specific work field and strength. We used four color models for skin color segmentation, these are RGB, YCbCr, HSV, and LAB color models. After skin like pixels detection, we convert this segmented image into binary form. This binary image contains skin regions, but we don t know that, where is 20 P a g e
3 human face in segmented image. Next step of face detection after segmentation is based on knowledge of human face. Work of next step is to remove non human face skin area from segmented image, by using Knowledge-based methods or human face features [1]. After classifying face as skin and non-skin pixels.rejection of non face pixels is performed as shown in fig.2 Fig.2. Block Diagram of Face Detection Algorithm III. REJECTION OF NON-HUMAN FACE SKIN REGION This is the main step in this algorithm. After classifying image into skin and non skinregions,skin regions is gone through steps as shown in fig2.to find out most probable human face region using human face feature method and region properties of human face,then these stages of this step remove non human face like regions by using their properties which are fixed according to the human face. At finally, when binary image is totally passed from this step, image contains only highly probable human faces like regions. We retrieve the locations of these human faces from a filtered or passed binary image from this step. We plot rectangular around these highly probable human faces in original image. Here, we describing following non human face rejections methods: Fig. 3 a) An example of Sij b) Removal of Noise using 5 by 5 filter 3.1 Removal of Noise In order to remove high frequency noise fast, we implement a low pass filter by a 5 5 mask. First, we segment Sij into 5 5 blocks, and calculate how many white points in a block. Then, every point of a 5 5 block is set to white point when the number of white points is greater than half number of total points. On the other hand, if the number 21 P a g e
4 of black points is more than a half, this 5 5 block is modified to a complete black block. Fig. 3(b) shows an example that we remove high frequency noise from Fig. 3(a). Although this fast filter will bring block effect, it can be disregarded due to that our target is to find where is human skin. [16] 3.2 Find out the skin-color blocks After performing the low pass filter, there are several skin color regions may be human face will be in Si,j. In order to mark these region, we store fore vertices of rectangle for every region. First, we find the leftmost, rightmost, upmost, and downmost points. By these four points, we create a rectangle around this region. Fig. 1(b) shows an example that store (1,1), (1,5), (5,1), and (5,5) to describe the candidate region. Thus, we can get several skin-color blocks called candidate blocks to detect facial feature. 3.3 Height to Width Ratio Detection Height to width ratio detection after the step of face localization, we can get several regions which may be human face. Then, the feature of height to width ratio, mouth, and eyes are detected sequentially for every candidate block. Because any of these three detections can reject the candidate blocks, low computation module has high priority to process. Height to width ratio is a very fast and simple detection. Let the size of candidate block is h w. We define that if the height to width ratio (h : w) is out of range between 1.5 and 0.8, it should be not a face and this candidate block will be discarded. Note that the range is determined by experiments. If the ratio is between 1.5 and 0.8 may be a face, the block should be processed by the following two detections. 3.4 Bounding Box Properties of Human Face After passing from above methods, the binary image now passed from this stage, this stage reject non human face skin region based on height to width ratio [4, 6, and 8]. Generally, height to width ratio of skin regions is measurable factor because it is also big factor for rejecting non human face like regions. If height to width ratio of skin region is less than by threshold value, then this skin region will be discarding from class of probable human faces. Here we decided threshold values for height to width ratio. For determining height to width ratio of each skin region, we used region properties based Bounding Box MATLAB function. IV.EXPERIMENTAL RESULTS Our face detection method was implemented with MATLAB 8.0. We tested our programming on 20 images which have single and multiple faces. We collected these images from our friends and internet. Following table shows the strength of algorithm. Table 1.Detection rate of proposed face detection algorithm Number of images Face Detection rate False Positive Rate % % P a g e
5 Fig.4 Face Detected from Own Created Dataset V. CONCLUSION The objective of our paper is to develop an acceptable and efficient face detection algorithm to solve the challenge in face detection technology under varying conditions. In this paper, we applied a strong approach for face detection, the human skin areas are estimated by using skin color segmentation method. The skin color distribution in histogram map gives an idea to choose appropriate thresholds value for detecting skin pixels. Four color models are used for proposed skin color segmentation algorithm. This segmented image is converted into binary format image, this binary image has human face regions and non human face regions. Rejection of non human face regions methods decide which region is human face and which is not human face. The experimental results shows that, this algorithm justice the robustness of this method. We want to increase its speed and to overcome on false face detection rate for increasing accuracy of the system in future. There are some recommendations for further improvements can be made in term of training examples for getting good results. The proposed Algorithm for this thesis detects only human faces in an image, After detecting human faces in an images there should be some extra features detection in future work, such as eyes, a nose and mouth detections in faces. Fig.5 Face Detected from Standard Dataset 23 P a g e
6 VI DISCUSSION RGB and HSV color models are used for skin color segmentation. These color models with thresholds, help to remove non skin like pixels from an image. We checked each skin region, that skin region is actually represents a human face or not, by using human face features based on knowledge of geometrical properties of face.using low pass filter the extra pixels in the white blocks are removed. After that it passes through height to width detection,it is useful to remove the non-face like regions. The experiment result shows that, the algorithm will gives hopeful results. REFERENCES [1] Paul viola, Michael Jones, Robust real time face detection,in second interna- tional workshop on statistical and computational theories of vision-modeling, learning, computing, and sampling, pp.1-25 Vancouver, Canada, July [2] E. Hjelmays, and B. K. Low, Face detection: a survey, Computer Vision and Image Understanding, vol. 83, pp No. 3, Sept [3] Visal kith, Mohamed El Sharkawy, Tonya Bergeson-Dana, Salwa El Ramly and Said El Noubi, A feature and appearance method for eye Detection on gray intensity face images, in Computer Engineering & Systems,pp , ICCES [4] Suzuki Y,Shibata T, Multiple-Clue Face Detection Algorithm using Edge Based Feature vectors, IEEE transaction on Acoustics, Speech, and Signal, Processing, vol.5, pp.35 35, sept [5] Rein-Lien Hsu, Abdel-Mottaleb, M., Jain and A.K., Face detection in colorimages,international Conference on Image Processing, [6] Hwei-Jen Lin, Shwu-Huey Yen, Jih-Pin Yeh, and Meng-JuLin, Face Detection Based on Skin Color Segmentation and SVM Classification, The Second Inter- national Conference on Secure System Integration and Reliability Improvement. [7] Xutao Zhang, Yudong Guan, ShenWang, Jianquan Liang and TaifanQuan, Face recognition in color images using principal component analysis and fuzzy support vector machines, Systems and Control in Aerospace and Astronautics,2006. [8] Pham The Bao, Jin Young Kim and Seung You Na, Fast multi face detection in color images using fuzzy logic,intelligent Signal Processing and Communi- cation Systems, ISPACS [9] LidiyaGeorgieva, Tatyana Dimitrova, Nicola Angelov, RGB and HSV colour models in colour identification of digital traumas Images, International Conference on Computer Systems and Technologies - CompSysTech2005 [10] Wen Chen, Yun Q. Shi and GuorongXuan, Identifying Computer Graphics Using HsvColor Model And Statistical Moments Of Characteristic Functions, International Conference on Multimedia and Expro, 1, pp , [11] TD. Teodorescu, KA. Maiorescu and 1-L. Nagel, TwoColor based Face Detection algorithms: A Comparative Approach,2nd international conference in arti_cial intelligence, P a g e
7 [12] Aamer Mohamed, Ying Weng, Jianmin Jiang and Stan Ipson, Face Detection based Neural Networks using Robust Skin Color Segmentation, 5th Interna- tional Multi-Conference on Systems, Signals and Devices,2008 [13] W. Zhao, R. Chelappa, A. Rosenfeld, Face Recognition: A Literature Survey ACM Computing Surveys, Vol. 35, No. 4, pp [14] Garcia C., Zikos G., Tziritas G., Face Detection in Color Images using Wavelet Packet Analysis, Proceedings of the 6th IEEE International Conference on Multimedia Computing and Systems, p ,june, [15] Akshay Bhatia, SmritiSrivastava, and AnkitAgarwal, Face Detection using Fuzzy Logic and Skin Color Segmentation in Images,Third International Conference on Emerging Trends in Engineering and Technology,2010 [16] Singh Raghuvanshi,DheerajAgrawal, Human Face Detection by using Skin Color Segmentation, Face Features and Regions Properties, International Journal of Computer Applications ( ) Volume 38 No.9, January P a g e
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