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The paper presents an improved median filter for salt & pepper impulse noise removal. The computationally efficient filtering technique is implemented as a two pass algorithm involving identification of corrupted pixels that are to be filtered are perfectly detected into a flag image using an iterative fixed sized smaller window approach and modification of them by a valid median. Experimental...
An effective median filter for salt & pepper impulse noise removal is presented. This computationally efficient filtering technique is implemented by a two pass algorithm; In the first pass, identification of corrupted pixels that are to be filtered are perfectly detected into a flag image using a variable sized detection window approach; In the second pass, using the detected flag image, the...
In this paper, a new median based filtering algorithm is presented for the removal of impulse noise from digital images. A good analysis of the limitations of the top ranking median filters, the progressive switching median filter, PSMF and the rank-order based adaptive median filter, RAMF is made and are overcome very effectively by the proposed filter which cleans the impulse corruptions of a digital...
The popular international standard for compression, the Joint Photographers Expert Group (JPEG) quite often leads to noticeable discontinuities along the boundaries called the `blocking artifacts'. When the image is JPEG compressed the high frequency details of the coded image are mainly contaminated by quantization noise. An estimation of the actual pixel is obtained from the decoded image. The estimated...
This paper describes a robust, oblivious data embedding scheme which uses lattice vector quantization. The embedding is done in the DCT domain. The signature image is vector quantized and the indices obtained are coded using error-correcting codes (BCH codes). The codewords obtained are multiplied by a scaling factor and perturbed into the DCT coefficients of the host image which is lattice vector...
Human face detection techniques play an important role in applications like face recognition, video surveillance, human computer interface, face image database management, and querying image databases. Using color information in images is one of the various possible techniques used for face detection. This paper proposes a novel technique for detecting faces in color images using an adaptive threshold...
A novel contour representation algorithm for binary images which is an extension of the conventional chain code is proposed in this paper. The algorithm exploits the features of the conventional chain code when advantageous, is precise and simple with lesser computational complexity than most of the other standard shape representation algorithms. It uses very low bit-rate compared to the conventional...
A new fuzzy based multiscale morphological segmentation is proposed in this paper. The technique works satisfactorily on gray scale images containing bright and dark features of various scales even in an impulse corrupted environment. The segmentation algorithm involves three passes. In the first pass, the image is preprocessed by using an iterative adaptive switching median filter which reduces the...
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