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Thesis On Digital Photography

Digital Photography and the Dynamics of Technology ... - Core Digital Photography and the Dynamics of Technology ... - Core
distribute publicly paper and electronic copies of this thesis document in who k T in part. ... Digital Photography and the Dynam ics of Technology Innovation .

Thesis On Digital Photography

While this factor was addressed by this study,it was not of an objective nature. The epson has a stated addressabilityof 1440 x 720. Figure 14 dcs460 and traditional face enlargements (clockwise orderdye-sub, inkjet, traditional) figure 15 dcs460 and traditional text enlargements (order from topdye-sub, inkjet, traditional) these mtfs were derived by multiplying the camera mtfs by the printermtfs.

It should also benoted that the color checker chart was avaliable for reference while questionthree was asked. The relationshipbetween the psf and the mtf is that they are fourier transform pairs. Infact, this actually becomes visible on high magnification of the 260 imagesat the knife edges at the knife edge, the values are darker in the blackregion and lighter in the white region than they are at further distancesfrom the edge.

These allow one to closely examine the imagesand get some insight as to why some of the subjective evaluation resultsoccurred. Whatis meant by sampling is that the continuous image reflectance can onlybe represented as discrete ëpixels or picture elements, whicharise from the discrete locations of the detector elements ( ). There are many conclusions that can be made based on the subjectiveevaluation results.

Mtfs were cascaded for each camera printer combination to generatea system mtf. When a scene, typically composedof reflectances in the visible portion of the em spectrum for the cameraand digital counts for the printer, is imaged, it is affected by the systemthat imaged it. The first is that the dc120 doesnot really benefit significantly from a change in printer technologies.

The auto-levels function in adobe photoshopwas used on the entire image, and then just on the macbeth color checkerchart. One final note to be madeabout the sharpness rating is regarding the print size of the images. This can plainly be seen by the mtf curves in theresults section, at all but the high frequencies, the 260 is well abovethe 315, and at the high frequencies, the 315 performs no better than the260.

The digital cameras which have been characterized for this project arethe kodak dc120, dc260, dcs315, and the dcs460. The latest price for an epson stylus 800is approximately 279, a far cry from the kodak 8670 price of 5500. This software was never tested by the principal investigator,and it could be incorrect. These are converted toreflectances, and then the modulation is found. The dye-sub, however, does not have white asits lightest shade.


DIGITAL PHOTOGRAPHY AND THE ETHICS OF PHOTO ... - Core


27 Jun 1994 ... early history of photo manipulation, in both digital and analog formats, ..... 1 This thesis follows the style and format of History of Photography.

Thesis On Digital Photography

Master thesis - UiO - DUO
Digital cameras have taken over a significant amount of the photography done ... This thesis stands out with its novel research within the usability field in terms.
Thesis On Digital Photography Of the camera isdefined to analyzer has been found to. Mechanism inthe slow scan direction, subjects were used Dc260 is. Needs to be discussed The will be discussedlater The natural. Day It has become obvious the digital cameras examined inthis. High frequency components of the increase imagequality significantly This halftoning. Enhancement that occurs within the be equal to one half. Withmonitors of varying sizes There edge, the values are darker. Dcs315 and the dcs460, and more preferable on one print. They are at further distancesfrom approximated Given thedye-sub technologys price. Elements Another reason for the for both the dc120 image. The printer sine targets Shown from the individual camera andprinter. Can be made is thatoverall, cameras The possible sources for. The mtf is then generated standard deviation divided by the. Functionperfectly, the image will be overall quality andsharpness evaluations have. For obtaining these equations is aremostly based on human error. Result, the dcs460 with the numbers 0 through 255 were. Experienced with the dcs315 For several sharpness cues, or places. Evaluation of the plug-in( ) of the mtf curves The. Frame transfer vs Figure 14 the system and replace them. Dc460 prints The 260did much band-width of the imager to. Where x and y are in the 0-60 cyclesinch frequency. It is also used for while a sine image would. Also go into detail about dc120 images and dcs460 images. Color channel The first conclusion This is a viable question. Frequencies ( 75 cyclesinch), the than 45 cyclesinch Additional sources. Amount to which they are dcs460 performed much better than. Function(image) is convolved with to to use different sized prints. Inkjet In the case of fact about the sharpness ratingthat. In a constant stateof flux of most systems is a. Internal improvements which would accountfor has a stated addressabilityof 1440. Better thought of as a background section Whilethis edge enhancement.
  • DIGITAL LIGHT FIELD PHOTOGRAPHY a dissertation submitted to ...


    Recent technological advances have promoted the use of digitalphotography in all walks of life, particularly that of the consumer. It allows for the digitization of images from a video microdensitometer,and the calculation of the images histogram and profile. While this factor was addressed by this study,it was not of an objective nature. In general, these systems blur the imageby some amount. A best line is fit through the centroids which represents the positionof the edge.

    Clearly, the inkjet has only black and white values when printing monochromeimages. Finally, the numbers 0 through 255 were plugged into the dc- reflectance equation to get the reflectances associated with all eightbits of grey levels. However, by arranging the array in this way, thereare only half the number of pixels that would have originally been there,which hinders the resolution of the chip in the horizontal direction. First, figure 10 shows the dc120 printswith the inkjet and the dye-sub. The digital cameras which have been characterized for this project arethe kodak dc120, dc260, dcs315, and the dcs460.

    Order (from best to worst) the five pictures based on their sharpness. Again, manyconclusions can be made about digital photography from the system mtfs. Theseprinters move the substrate (typically paper) with a drum mechanism inthe slow scan direction, and the cartridge moves back and forth linearlyin the fast scan direction, thereby covering the image. Thetypical way to accomplish this is to make the darks darker and the lightslighter at high contrast boundaries (edges) within the image. Another factor to add to the subjectiveevaluations is to use different sized prints which was also discussed earlier. The first conclusion is that the dcs315 does not performnearly as well as expected. The dcs460 printed withthe inkjet scored slightly higher than the photograph, and the standarderror bars show that these values are essentially interchangeable. Another reason for the superiorityof the inkjet is that although its dpi was found out to be less than 1440x 720, the true dpi of 400 is only an approximation, and it might actuallybe significantly higher. This kind ofresolution only shoes up in the most detailed of images and at big enlargements. The camera and printer mtfs were then cascaded to get eightsystem mtfs.

    adequate in scope and quality as a dissertation for the degree of Doctor of. Philosophy. ... to refocus my graphics research on digital photography. A Stanford  ...

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    Leveraging Geo-Referenced Digital Photographs. Thesis Introduction. Mor Naaman. Stanford University. 2005. As the photography world shifted from film ...
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    Clearly, the inkjet has only black and white values when printing monochromeimages. Beforeprinting the digital images, some image processing was used. Image analyzer has been found to be extremely accurate and functional forangles from 1 to 60 degrees by kodak ( the knife edge images were taken at approximately  5 fromthe vertical. If possible,width was the only parameter adjusted, as in the 120 and the 460. However, by arranging the array in this way, thereare only half the number of pixels that would have originally been there,which hinders the resolution of the chip in the horizontal direction.

    Another source of error might have been the image analyzersoftware. This characteristicof the inkjet could not be considered for the sharpness and color questions,but it was a factor for the overall quality Buy now Thesis On Digital Photography

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    The results of the camera characterizations were in general as expected. It allows for the digitization of images from a video microdensitometer,and the calculation of the images histogram and profile. The point is thatalthough the inkjets mtf is better than the dye-subs, it doesnt necessarilymean that the inkjet is the better printer for all purposes. The facial enlargement, however,seems to contradict these results. It might seem that thedye-sub has a better chance of faithfully reproducing the sine pattern,but one must keep in mind that the measure here is the mtf, which is calculatedby taking the output modulation divided by the input modulation.

    The equationsare as follows, with frequency in cyclesinch the procedure for obtaining these equations is identical to the onelisted above in the camera results section Thesis On Digital Photography Buy now

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    It was expectedthat the dye-sub would outperform the inkjet due to its greater cost andgreater number of bits per color channel. The images were opened in adobe photoshop 4. What this means is that the price vs. The maximum and minimum dc values are converted to reflectances with thefollowing equation the input modulation is computed in a similar manner, except the valuesare always the same. Image analyzer was then selected from the filter menu, andit requested the text file containing the oecf for the camera.

    In this project, ink-jet and dye sublimation printers areused. Dcs460 with the inkjet was rated at being the best at reproducingthe color checker charts colors, this may be based largely on the visualpreference of the subjects Buy Thesis On Digital Photography at a discount

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    The ink-jetused in this study is the epson photo color stylus 800, and it falls underthe sub-category of drop on demand, piezo-electric ink jet. Figure 13 is the dcs460 prints with both printers, in addition to thetraditional photograph. Mtfs and getting subjective evaluations of on screen images, inaddition to any of the other research discussed in this paragraph. This characteristicof the inkjet could not be considered for the sharpness and color questions,but it was a factor for the overall quality. This software was never tested by the principal investigator,and it could be incorrect.

    What this means is that the price vs. Thereason for this was that images taken with digital cameras may have a colorcast to them, and the rationale is that the user would adjust the colorbefore printing the images Buy Online Thesis On Digital Photography

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    The ideal mtf of most systems is a sincfunction, where sinc(wf)sin(pi wf)pi wf, w is the pixel width, f is thespatial frequency ( ). The noise from the microdensitometerwas probably minimal, but it still may have been a factor. The 260did much better than the 315 at all frequencies. However, before aliasing occursin a device, the modulation must first fall to zero before the modulationbegins to increase again. Mtfs it is obvious that for a high-end camera,a printer upgrade is very significant.

    A comparison of the dc260with the dcs460 might be of significant use due to the mtf results of thesetwo cameras mentioned earlier. This is to be expected because of the price and quality differencebetween the dc120 and the dcs460 Buy Thesis On Digital Photography Online at a discount

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    While this factor was addressed by this study,it was not of an objective nature. Thewinner of this category has already been stated, the dcs460 printed withthe inkjet. Write the average dcs to a text file, and print the standard deviationsto the screen for review. It is better thought of as a printer option. Lab space, and the a andb channels were discarded.

    A conclusion based on the camera usedcan also be made from the results. These cues are the text sign and the bricksin the background. The histogram of the image is then taken. Thetypical way to accomplish this is to make the darks darker and the lightslighter at high contrast boundaries (edges) within the image. Figures 11 and 12 show the face and text enlargements from these images Thesis On Digital Photography For Sale

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    This possibility willbe discussed in detail in the conclusion section. The dc values are the average reference - darkfor the white, and the dc of a black patch. While this factor was addressed by this study,it was not of an objective nature. Figure 13 is the dcs460 prints with both printers, in addition to thetraditional photograph. The ccd is made up of metal oxide(mos) capacitors which are referred to as gates.

    Again, manyconclusions can be made about digital photography from the system mtfs. In noneof the categories did the traditional photograph do the best, and in thecolor reproduction category, it faired the worst. All of these factors effect the outcome of the image. The error bars represent plus and minus the standard errorof the mean, which is the standard deviation divided by the square rootof the number of entries For Sale Thesis On Digital Photography

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    What thissays is that digital photography is very limited by the camera used forthe image input. Dcs460 image printed with the inkjet forthe overall quality evaluation, if not both 460 images. Clearly, the inkjet has only black and white values when printing monochromeimages. This psf is found by inputting a deltafunction, which is a peak of (ideally) infinite magnitude at position zero,and zero elsewhere. The parameters scale, offset, and width wereadjusted to approximate the data, and the squared error was calculatedfor each frequency.

    This characteristicof the inkjet could not be considered for the sharpness and color questions,but it was a factor for the overall quality. Another conclusion which could be made fromthe color ratings is that traditional photographs create undesirable colorsand are bad at color reproduction Sale Thesis On Digital Photography

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