Image Processing Of Photographs Research Articles

Research on the Application of Computer Virtual Image Technology in Artistic Photography

The principles of using computer parallel calculation method carries out in-depth analysis and research for computer art photography virtual imaging technology, and carries out image processing experiments for the artistic image rendering, we can get better art photography image processing effect. Combined with photography image virtual image mathematical model, this paper designs a computer program of photography image art rendering, and carries out art rendering for a landscape painting, we can get ideal art modification effect. Finally, this paper begins to calculated results for the parallel computing of art photography rendering, the calculation is found that the parallel computing is less time-consuming than general algorithm and with the increase of pixel time-consuming increased gently, it doesnt appear large fluctuations. For an image of the same resolution to carry on data processing, the general algorithm takes 55 seconds to complete the task. For parallel computing, it needs to3 seconds to complete, greatly saving time and computer resources, and providing the theory reference for the development of artistic photographys virtual image technology

Experimental investigation on melting heat transfer characteristics of lauric acid in a rectangular thermal storage unit

This paper presents an experimental effort to visualize temperature field and melt front evolution during solid–liquid phase change process. The study is focused on the melting of lauric acid in a rectangular thermal storage unit heated from one side. Thermophysical properties of lauric acid are determined and found to be desirable for application as a medium temperature phase change material (PCM). Image processing of photographs together with recorded temperatures are used to calculate the melt fractions, temporal heat storage and heat transfer characteristics, including the average Nusselt number on the hot wall as well as the local heat transfer rates on the melt front. Moreover, solid–liquid interface morphology and temperature field are employed to infer dominant heat transfer mechanisms and time-dependent flow structures during different stages of the melting process. Results indicate that during the initial stage of melting, heat conduction is the dominant mode of heat transfer, followed by transition from conduction to convection regime and convection dominated heat transfer at later times. Approaching the end of the melting process, bulk temperature of the liquid PCM increases and stratified temperature field appears at upper part of the enclosure which reveals depression of the convection currents.

摄影测量图像处理的高精度误差补偿法

摄影测量图像处理的高精度误差补偿法

Experimental study on sand bed excavation by impinging swirling jets

The excavation performance of swirling jets impinging normally against a sand bed from several distances is described. A specially-designed nozzle with adjustable swirl vanes was used to generate swirling jets of various swirl intensities. Two sand beds of different grain size distributions were considered. The main scour patterns on the sand bed produced by the swirling jets were measured by image processing of photographs of the bed illuminated by a laser sheet. The velocity profiles of the swirling jets at the nozzle exit were measured using Laser Doppler Anemometry for various test conditions. The scour patterns were then analysed in relation to the details of the velocity profile of the swirling jets, their Reynolds numbers and the distances from the nozzle to the bed. The optimum jet features resulting from the different swirl nozzles and the best impinging distances for sea bed excavation are identified and discussed.

Characterization of Plasma Jet Structure and Fluctuations by Statistic Processing of Photographic Images

A couple camera-computer provides a possibility of simple characterization and monitoring of plasma jets. This paper demonstrates another way of characterization of plasma flow structure by statistical processing of plasma jet images. The processing is based on an analysis of variations of local brightness in a sequence of images recorded by fast shutter camera. Resulting pictures show space distribution of plasma jet brightness fluctuations.

大阪湾人工島における住戸からの眺望の評価 : 住民の評価と居間からの景観写真に対する重回帰分析

大阪湾人工島における住戸からの眺望の評価 : 住民の評価と居間からの景観写真に対する重回帰分析

Control of the tuning of reference fringes in the interference pattern of changes in the object state in the optical processing of holograms and photographic images with the same spatial carrier

The condition of obtaining undistorted reference fringes when processing a pair of superimposed holograms or photographic images with a constant carrier frequency of bands due to their relative rotation or tilt is obtained. It is shown that the degree of fringe distortion is determined by the combined action of aberrations and the value of the parameter being measured. The technique of an arbitrary tuning of reference fringes is described, which makes it possible to eliminate the relative shift of holograms or photographic images. Experimental results obtained by the optical processing of photographic images of projected fringes are presented.

Approximate field measurement of surface luminance using a digital camera

This paper describes a method of estimating and recording surface luminance using widely available types of digital cameras and photographic image processing software. The method involves recording the luminance of a 10-step grey scale placed within a scene at the time an image is captured. The relationship between luminosity (a value obtainable from the software) and luminance of the grey scale may then be used to determine the luminance of surfaces within the scene to an accuracy of within 10%. The technique has been successfully applied to interior and exterior scenes lit in a variety of ways and to a number of types of digital camera. The methodology, robustness and limitations of the technique are set out.

QUANTITATION OF VITAL BLEACHING BY COMPUTER ANALYSIS OF PHOTOGRAPHIC IMAGES

The authors investigated the use of computer processing of photographic images to monitor changes in tooth brightness after nightguard vital bleaching, or NGVB. Photographs of shade guides and clinical cases (patients' teeth) were taken on 35-millimeter film with electronic flash illumination and processed commercially. A slide scanner was used to digitize images as red, green and blue, or RGB, files, with constant brightness, contrast and linearity settings; the images were then analyzed with commercial software. Relevant image components (that is, teeth or shade guide tabs) were separated, and histograms of various numerical color descriptors were generated for each image component. Analysis of shade tab images showed that the mean pixel intensity for the RGB blue channel, or MPIb, was the most satisfactory brightness descriptor, with clear sequential MPIb increments from lighter to darker shades in each series of colors (A through D) and close correlation with the manufacturer's brightness scale (r = .83). Mathematical analysis of MPIb data for shade tabs in the same image yielded a brightness index that was reproducible and correlated well with the manufacturer's brightness scale. Sequential measurements of this index in three subjects whose teeth were bleached with carbamide peroxide for 14 days correlated well with assessments made by visual shade guide comparisons. The authors conclude that computer analysis of digitized photographic images with internal color controls provides an index of tooth brightness that is reproducible from image to image. A brightness index derived from computer analysis of digitized photographic images may be useful for monitoring the effectiveness of NGVB.

Comparison of three edge detection methods for image analysis of fragmented sandstones and bricks

The quantitative determination of fragment size is essential at various stages of mining. This can be achieved in different ways such as through sieving, by observation, and by analytical and empirical methods. A new method, digital image processing of photographs or video signals is introduced into this field. However, for the straightforward extension of the concept of image processing to the field it is necessary to determine the feasibility of this method initially at laboratory level. Moreover, it is also necessary to establish the accuracy and reliability of the method on rock fragments of irregular shapes. In this paper, the development of software to calculate the size of rock fragments using photographs is reported. Furthermore, the accuracy and reliability of the method is compared with manual measurements for calibration purpose. The work reveals that the suitability of the image processing method depends on the nature of projected surfaces of mixed and overlapping rock fragments in the case of muckpiles. Good accuracy is obtained in the case of isolated rock fragments.

Bubble Characteristics in Multi-Phase Flow Systems: Bubble Sizes and Size Distributions.

The bubble characteristics for multi-phase flow systems were studied in a two-dimensional column by direct visual observation together with the image processing of photographs. The effects of operating conditions such as particle sizes, superficial gas and liquid velocities on bubble flow behavior were examined. Bubble size distributions in both two- and three-phase systems operated both semi-batchwise and continuously were found to be fairly well represented by the log-normal distribution. The variation in bubble flow behavior appears to be closely related to the difference in fluidized states of solid particles. In small particle systems (gas-sparged slurry reactors), the bubble flow behavior is similar to that in two-phase systems. On the other hand, larger particle systems (three-phase bubble columns and three-phase fluidized beds) exhibit appreciably different bubble behavior and show the dependency of the gas velocity on the Sauter mean diameter of bubbles and the geometric standard deviation of bubble size distribution.

Automatic data capture and analysis of Rayleigh interference fringe displacements in analytical ultracentrifugation

Low speed sedimentation equilibrium techniques using the analytical ultracentrifuge provide a powerful tool for the analysis of molecular weight and molecular weight distributions of a wide range of macromolecular dispersions. The precision of the computed parameters depends critically upon the off-line measurement and processing of photographic images of Rayleigh interference patterns, used to record the macromolecular solute distributions at equilibrium. We have shown that it is possible to use a commercial scanning densitometer (LKB 2202), of a type widely found in laboratories in the life sciences, to capture a series of digitized scans across the fringe pattern; and have developed a simple but highly efficient algorithm, based upon the iterative evaluation of a limited number of discrete Fourier coefficients, for data analysis. This algorithm is implemented in a Pascal program which can be run on the Ultroscan's own microcomputer. Results obtained show that a gain in precision of some 5-fold has been obtained, as compared with previously fully automatic evaluation systems.

Investigation on Making an Advance of Photographic Image Processing by Using a Microcomputer and Its Application to LANDSAT Imageries

Investigation on Making an Advance of Photographic Image Processing by Using a Microcomputer and Its Application to LANDSAT Imageries

An Image Reconstruction for Capella with the Steward Observatory/AFGL Intensified Video Speckle Interferometry System

In the decade since its invention by Labeyrie in 1970, speckle interferometric techniques have evolved from simple optical processing of photographic images to high-speed digital processing of quantum-limited video data. This progress has been summarized in preceeding papers by McAlister and Weigelt in this colloquium.The basic hardware of our system has been described in Hubbard, et al. (1979 – The basic speckle camera) and in Hege et al. (1980 – The intensified video system). These capabilities have been successfully applied to observations over a dynamic range of 16 magnitudes, from Betelgeuse (Goldberg, et al. 1982) and Capella (this paper), at one extreme, to Pluto/Charon (Hege, et al. 1981a) and the 16th magnitude resolved QSO system PG1115+080 (Hege, et al. 1981b) at the other. To accomodate this dynamic range two distinct data-recording/data-processing modes have been implemented. The Analoue mode records the image intensity for each pixel in the speckle interferogram. This is applicable for objects brighter than 7th to 10th magnitude, depending upon telescope aperture, observing band-pass and detector image scale. For fainter objects the Event mode records individual photoelectron addresses in the speckle interferogram.

Optical Processing Of Photographic Images

Recent advances in electro-optics have brought into use communication and information theory to analyze performance in coherent and incoherent optical information processing systems. An optical information processsing system can be analyzed with many of the same concepts of linear system theory (e.g., spatial impulse response, spatial frequency and spatial domain synthesis, etc.), and the photographic images to be processed can be regarded in the same manner as time signals (e.g., spatial frequency content, spatial amplitude and phase modulation, space-bandwidth product, etc.). Both coherent and incoherent optical processing systems can be treated as linear systems, and the processing operation can generally be carried out by communication theory concepts. Although coherent optical information processing operations have been used for performing complex amplitude operations, complex processing can also be performed with incoherent or white-light illumination. The importance of optical information processing operations, either coherent or incoherent, is due to the basic Fourier transform properties of lenses. In this paper, we will discuss mostly the incoherent systems because they are of more recent interest and possess certain advantages, we feel, over the traditional coherent optical processors. Experimental illustrations of the results are provided. In view of the broad area in optical processing of photographic images, we will confine ourselves to a few applications that we consider of general interest. We apologize for the omission of other techniques and applications, and for neglecting the inclusion of their references.

Ozone in the Photoprocessing Industry

Abstract The processing of photographic images results in the discharge of I thousands of pounds of chemicals and millions of gallons of water each day in the U.S. alone. With ever increasing environmental regulations and the rising cost of chemicals, the photoprocessing industry has turned to ozone for chemical recovery and pollution control. While the recovery of silver from photographic solutions or effluents by ozonation has been studied, recycle of ferricyanide bleach is the major use of ozone today. In addition, ozone is being used for chemical destruction of processing solutions where reuse has not been practical.

Computer controlled picture scanning with application to labeled biological cells

High speed automatic processing of photographic images is of considerable value in the fields of medicine and biological research. Tests of routine and research nature are often time consuming because they must be done visually. The time factor often limits the capability for large scale microscopic examination of tissue specimens. One of the main obstacles to accomplishing the above is a limitation on the number of picture points which can be stored in a digital computer memory. This paper concerns an elementary method for computer examination of photographic images without the necessity for storing an entire digitized picture in computer memory (which can be impossible). The method involves using digital feedback from the optical processing equipment (flying spot scanner) to isolate the most important regions of the picture.