Geotagging Research Paper

Geotagging: Using Digital Repeat Photography to Study Changes in Phenology ________________________________________________________________________

Research Paper

Presented to the

________________________________________________________________________

In Partial Fulfillment

of the Requirements for

Research Practicum

________________________________________________________________________

Research Completed

At

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May 2013
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In digital photography, the histogram is a graph that displays where all of the brightness levels in the scene are found, from darkest to the brightest point. The values on the horizontal axis range from 0 (darkest) to 255 (brightest). The histogram shows the count for the number of pixels at each level between black and white. The range goes from black to dark to medium to light and then to white. The vertical axis shows the height of the points on the graph and how much of the image is found at any particular brightness level. Histograms are now used by today’s photographers to master the image quality of their digital cameras. (Reichmann, n.d.) Color histograms display three separate histograms, one each for the R (red), G (green), and B (blue) color channels that make up the RGB color model. Most camera models also feature a Y color channel on their color channel for luminance, which is the combined value of the R, G, and B color channels. (Rockwell, 2006)
During the calibration stage, camera and lens problems are resolved, such as any optical effects causing distortion within the photograph. Finally, during the blending stage the individual photographs are placed or fully aligned the images to form an output panorama or high-resolution image. The set of photographs are then blended together and the seam lines between the images are adjusted to minimize the visibility of the seams between the images. (Cambridge in Colour,