The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The mammographic X-ray equipment uses a radiographic grid in order to remove the scatter radiation and improve image contrast. The grid causes striped lines to appear on the film and may degrade diagnostic information. In this study, we propose a new method which reduces the noise caused by the grid on mammographic film using non linear image filtering. We performed median filtering and the V-filtering...
As an important step for iris recognition, iris segmentation provides available texture region for subsequent processing. When using portable image capture device, non-ideal iris images are often obtained. Hence, this paper presents a novel algorithm for accurate and fast iris segmentation. By combining level set theory with variational method, probabilistic active contour model (PAC) is established...
This paper studies on the hardware design and implementation of a universal multi-DSP and FPGA image information processor in accordance with the PCI-E and CPCI specifications. The image information processor features two clusters of total four ADSP-TS201 TigerSHARC DSPs from ADI as the kernel processing unit, reconfigurable framework implemented by two Xilinx Virtex-5 FXT FPGA chips. Taking full...
With the great advantages of interactive projection technology, the new optical-electronic human-computer interactive large screen display system has been paid more and more attention. In this paper, the approach with a new optical structure based on linear detectors has been presented. This system consists of computer, projector, camera and digital pen, and the camera uses two linear detectors to...
Hyperspectral unmixing is the procedure by which the measured spectrum of a mixed pixel is decomposed into a collection of constituent spectra, or end members, and their mixing proportions. However, due to the hundreds of spectral bands contained in the hyperspectral imagery, the large amount of data not only increase the computational loads, but also are unfavorable for the fast hyperspectral unmixing...
Many image processing applications could potentially be simplified or improved if the scene lighting is invariant. A flash can provide consistent illumination in an image, but the flash intensity required in sunlight is impractical. An image of the scene taken without the flash can be subtracted to leave only the flash illuminated image if there is no motion in the scene, greatly reducing the flash...
Digital watermarking has been proposed as a solution to the problem of copyright protection of multimedia files in networked environments. In this paper, a block-based adaptive image watermarking scheme using just noticeable difference (JND) is proposed. The proposed scheme is performed in both pixel domain and discrete cosine transform (DCT) domain. It first divides host image into 8 times 8 blocks...
Seam tracking performance of an arc welding system is crucial to achieve high-quality welds. Visual sensing is one of the most attractive approaches to detect the seam position in the welding process, which provides valuable information to control the arc following the expected path. However, it is difficult to accurately detect the seam position adjacent to weld pool due to strong light disturbance...
The technologies for image contrast enhancement are improved evidently since the popularity of consumer electronics and image processing in the last decade. Based on histogram equalization (HE), this paper proposes a simple contrast enhancement scheme named adaptively increasing the value of histogram (AIVHE). It provides a convenient and effective mechanism to control the rate of contrast enhancement...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.