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To recover texture images from impulse noise by the opening operator which is one of morphological operations, a suitable structuring element (SE) has to be estimated. In this paper, we apply a Genetic Algorithm (GA) to an unsupervised design problem of SEs. In previous work, it was shown that deterministic Multi-step Crossover Fusion (dMSXF) which is a promising interpolation-directed crossover method...
Deterministic multi-step crossover fusion (dMSXF) is a promising crossover method in combinatorial problems, which performs multi-step searches focusing on inheritance of parents' characteristics using a neighborhood structure and a distance measure. DMSXF shows good search ability in various kinds of combinatorial problem. In this paper, we apply dMSXF to unsupervised design of morphological filters...
Recently, several data extraction methods from data embedding printing images by using cellular phones with a camera have been proposed. In these techniques, consideration for geometrical deformation and lens distortion in the data extraction process is essential. This paper proposes new correction algorithm based on line based correction (LBR) and projective transformation to the scanning of the...
Design of both a suitable window shape and appropriate weights in weighted median filters is one of important problems. Hitherto, unsupervised design methods of the filters by using simulated annealing (SA) or genetic algorithm (GA) have been proposed for texture images corrupted by impulse noise. These techniques estimate the optimal window shape and the optimal filter weights separately, and they...
This paper proposes improvement for the detection method for carotid artery calcification in dental panoramic radiographs. The existence of the carotid artery calcification as an index for arteriosclerosis attracts a great deal of attention. The detection method for carotid artery calcification has been proposed. However the detection rate is about 50% for real data and its improvement should be required...
This paper proposes a microphone array system separating speech signals, based on a different principle from independent component analysis (ICA). This system applies linear prediction error filters to microphone outputs, and using the prediction errors, adjusts the coefficients of adaptive filters. In this case, only the prediction errors satisfying the law of causality become available for the adjustment;...
This paper proposes a method for shortening the distance from a noise detection microphone to a loudspeaker forming the feedforward type of active noise control (ANC) system. In the ANC system, the primary noise detected by the noise detection microphone and the secondary noise provided by the loudspeaker is required simultaneously arriving at another microphone, called error microphone, monitoring...
Recently, several image retrieval systems have been developed, which regard the Web as a large scale image database. In this study, we use the image itself as index keys. From the Web, a set of similar images is retrieved based on numerical characteristics of images and simultaneously text information accompanying with the images is presented to a user. The user evaluates the relationship between...
This paper proposes a new tracking method based on phase only correlation (POC) for oncoming cars. The POC function can measure exactly displacement between the corresponding points in images. The proposed method applies the POC to detecting and tracking the oncoming cars from moving pictures taken by an in-vehicle camera. To improve the detection and tracking accuracy, a motion vector based initial...
This paper proposes a step size control method capable of steadily canceling acoustic echo even during double talk. The method is characterized by applying a sub-adaptive filter to the control. The step size and the number of taps of the sub-adaptive filter are larger and fewer than those of the main adaptive filter used for canceling the acoustic echo, respectively. Accordingly, the sub-adaptive...
Estimation of a suitable window shape and appropriate weights in weighted median filters is one of important problems. In this paper, we propose a new unsupervised design method for the window shapes and weights of weighted median filters. This technique is applied to texture images corrupted by impulse noise. As the performance measure for optimization by simulated annealing, rank-ordered absolute...
This paper presents a multiple channel active noise control system using the simultaneous equations method based on the different principle from the filtered-x algorithm. The simultaneous equations method can automatically recover the noise reduction effect degraded by acoustic path changes. In this paper, we apply the method to multiple channel active noise control systems and verify the performance...
A 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. For data embedding to printed image, a method using spread spectrum technique has already been proposed. However, there are two problems...
This paper proposes a step size control method capable of steadily canceling acoustic echo resisting double talk. The method is characterized by applying a sub-adaptive filter to the control. The step size and the number of taps of the sub- adaptive filter are larger and fewer than those of the main adaptive filter used for canceling the acoustic echo, respectively. Accordingly, the sub-adaptive filter...
This paper proposes an improvement method for a data embedding technique to printing images. This embedding technique is based on discrete cosine transform (DCT) and pseudo number (PN) sequences. In the conventional method, deformations, such as rotation and scaling have given a serious defect to the extraction rate. To solve this problem, a new data embedding position and the processing by the resolution...
JPEG2000 has a feature called region of interest (ROI). This feature can encode a restricted region in an image prior to its background (BG) region. In low bit rate compression, the code of the ROI region occupies the most part of the bit stream for the whole image by the rate control processing. To solve this problem, several progressive image quality control methods between the ROI and BG regions...
This paper analyzes the performance of a block implementation frequency domain adaptive algorithm, and from its result, derives a convergence condition as the range of step size. The validity of the convergence condition is verified by computer simulation.
In this paper, an extraction method of trabecular structures from dental panoramic radiographs using mathematical morphological operations is proposed. It can extract trabeculae excluding roots of teeth and enables the assessment of tooth extraction for trabecular pattern. A measurement method of the lengths and directions of trabecular segments is also proposed in this paper. It is suggested that...
A new technique for designing adaptive state-space digital filters using stable filter structures is developed. First, the coefficient sensitivities are related to intermediate transfer functions in order to generate gradient signals. Next, the LMS algorithm is applied to construct adaptive state-space digital filters with new systems to generate gradient signals. To illustrate the validity of the...
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