As a visual sign, a photographic image usually represents an object or a scene; this is the habitual way of seeing it. But it accomplishes that common semiotic task by representing various formal features of the object or scene: its color, shape, texture and spatial distribution of light. The curious fact is that photography does this in very different ways. With respect to color, a pigmented o...

Color is an important attribute for image matching and retrieval. Most of the attention from the research literature has been focussed on the color model with little or no consideration of the noise models. In this paper we investigate the problem of color indexing from a maximum likelihood perspective. We take into account the color model, the noise distribution, and the quantization of the co...

Purpose To evaluate the development of central atrophy in eyes with age-related macular degeneration (AMD). Methods Six-year longitudinal multimodal retinal imaging data (MODIAMD study) from 98 eyes of 98 subjects with non-late-stage AMD in the study eye at baseline were analyzed for the presence of central atrophy at each annual follow-up visit. Development, manifestation, and further progre...

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Aerial photogrammetry is one of the main methods obtaining geospatial information. After entering the 21st century, aerial photogrammetry technology has fully entered the digital age, and the quality of digital aerial photography results will directly affect the quality and accuracy of results of surveying and mapping .Therefore, it is necessary to inspect the quality of digital aerial photogra...

OBJECTIVE To evaluate the effect of age, duration of diabetes, cataract, and pupil size on the image quality in digital photographic screening. RESEARCH DESIGN AND METHODS Randomized groups of 3,650 patients had one-field, non-mydriatic, 45 degrees digital retinal imaging photography before mydriatic two-field photography. A total of 1,549 patients were then examined by an experienced ophthal...

Flash photography is commonly used in low-light conditions to prevent noise and blurring artifacts. However, flash photography commonly leads to a mismatch between scene illumination and flash illumination, due to the bluish light that flashes emit. Not only does this change the atmosphere of the original scene illumination, it also makes it difficult to perform white balancing because of the i...