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A Method for Data Embedding to Printed images Based on the Use of Original images
Takafumi SHONO,Mitsuji MUNEYASU,Yoshinobu KAJIKAWA 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Data embedding to printed images has become an important issue for several applications. In this paper, we assume an original image to be known and the server based data retrieval model, and a new method for the data embedding to the printed images is proposed. To embed many number of data bits, we adopt “Walsh code” for diffusion code, which is strong to the interference between diffusion codes. This can be also applied to the improvement of the detection process and we propose the embedding of same data to three blocks. This technique gives the tolerance to some distortion and noises. In the detection processing, a taken image is forwarded to the server which holds the original image and the embedded data is detected in the server. Therefore, more accurate detection becomes possible.
A Tracking Method for a Moving Object Based on POC Method
Hitoshi NAMBA,Mitsuji MUNEYASU 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
This paper proposes a new tracking method for a moving object based on phase only correlation (POC). The POC method can measure exactly displacement between the corresponding points of two images. The proposed method applies the POC method to detecting and tracking the moving object. In the tracking of the moving object by an in-vehicle camera, it is difficult to use the techniques based on background difference or frame difference. The improvement of the detection accuracy is not also easy. To solve this problem, an initial point search method by the POC based calculation technique of motion vectors and a tracking method by using the coarse-to-fine search technique based on the POC method are proposed. By applying the proposed method to moving pictures taken by the in-vehicle camera, the good result for the tracking of the oncoming car in it is shown.