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The states and territories included in the United States Census Bureau's statistics for the United States population, ethnicity, and most other categories include the 50 states and Washington, D.C. Separate statistics are maintained for the five permanently inhabited territories of the United States: Puerto Rico, Guam, the U.S. Virgin Islands ...
Allan Paivio's dual-coding theory is a basis of picture superiority effect. Paivio claims that pictures have advantages over words with regards to coding and retrieval of stored memory because pictures are coded more easily and can be retrieved from symbolic mode, while the dual coding process using words is more difficult for both coding and retrieval.
being the total number of gray levels in the image (typically 256), n being the total number of pixels in the image, and () being in fact the image's histogram for pixel value i, normalized to [0,1]. Let us also define the cumulative distribution function corresponding to i as
The maximum contrast of an image is termed the contrast ratio or dynamic range. In images where the contrast ratio approaches the maximum possible for the medium, there is a conservation of contrast. In such cases, increasing contrast in certain parts of the image will necessarily result in a decrease in contrast elsewhere.
This is a list of stock market crashes and bear markets.The difference between the two relies on speed (how fast declines occur) and length (how long they last). Stock market crashes are quick and brief, while bear markets are slow and prolonged.
The United States fifty-dollar bill (US$50) is a denomination of United States currency.The 18th U.S. president (1869-1877), Ulysses S. Grant, is featured on the obverse, while the U.S. Capitol is featured on the reverse.