نتایج جستجو برای: image
تعداد نتایج: 376775 فیلتر نتایج به سال:
accurate interpretation of radiographic images is dependent on viewing conditions. recently the number of radiology departments has been increased so it needs to use a workstation for reporting. the aim of this study was assess monitor performance and the effect of viewing conditions on object detection. this investigation aimed to quantify the effects of changes in box brightness and ambient l...
background: butterworth, gaussian, hamming, hanning, and parzen are commonly used spect filters during filtered back-projection (fbp) reconstruction, which greatly affect the quality and size accuracy of image. materials and methods: this study involved a cardiac phantom in which 1.10 cm thick cold defect was inserted into its myocardium wall and filled with 4.0 μci/ml (0.148 mbq/ml) 99mtc conc...
there are imaginative poets who have a look to nature and get astonished for their beauty and as if are observed for the first time.there are also some poets which are deeply inspired and get deeper insight by important factors of nature like color, sound and dynamism.dynamism is superior to the others. when poetic images are free of dynamism, they are deprived of beauty thus they are no more e...
the edges of an image define the image boundary. when the image is noisy, it does not become easy to identify the edges. therefore, a method requests to be developed that can identify edges clearly in a noisy image. many methods have been proposed earlier using filters, transforms and wavelets with ant colony optimization (aco) that detect edges. we here used aco for edge detection of noisy ima...
one of the challenging issues in managing the existing large digital image libraries and databases is content based image retrieval (cbir). the accuracy of image retrieval methods in cbir is subject to effective extraction of image features such as color, texture, and shape. in this paper, we propose a new image retrieval method using contourlet transform coefficients to index texture of the im...
ct image quality has been affected by many factors such as kvp, ma, exposure time, alogorithm and section thickness. gantry tilt has the main role in visualization of the temporal bone anatomic structures. in this study, we tried to optimize these factors to determine the best gantry tilt. this study was performed on the human skull phantom and then extended to 15 patients. the phantom was made...
در این پایان نامه یک روش اتوماتیک برای اندازه گیری سطح صورت انسان و بازسازی آن توسط روش فتوگرامتری رقومی اجرا و ارزیابی گردیده است . عکسبرداری، براساس طراحی شبکه فتوگرامتری برد کوتاه، توسط یک دوربین آماتور از حداقل هفت ایستگاه همگرا صورت گرفت . محاسبات کالیبراسیون و توجیه خارجی توسط یک شبکه نقاط کنترل سه بعدی که برای این منظور طراحی، ایجاد و اندازه گیری گردید، صورت گرفت . برای اینکه محاسبات تنا...
سینما و انیمیشن و طبیعتاً تکنیک استاپ موشن، اشتراکات زیادی در قواعد دارند. تصویر (image) را می توان ازنظر میزانسن (mise-en-scene) به مثاب? بیان خاص یک کارگردان تفسیر نمود. از جهت دیگر سینما، ترکیبی از هنرهای گوناگون است که قسمتی از آن به هنرهای تجسمی، وابسته است. هنرهای تجسمی نیز، قواعدی در راستای مفهوم خود دارد. قواعدی که سازمان دهی عناصر را تحت الشعاع خود قرار می دهد. اما آیا این قواعد که در ی...
With unprecedented growth in production of digital images and use of multimedia references, requirement of image and subject search has been increased. Systematic processing of this information is a basic prerequisite for effective analysis, organization and management of it. Likewise, large collections of images have been made available on the Web and many search engines have provided the poss...
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