A measure of the image resolution of televisions, digital cameras, etc. In television, the number of distinguishable horizontal lines is called vertical resolution, and the number of distinguishable vertical lines is called horizontal resolution. Vertical resolution is determined by the number of scan lines; in the case of traditional Japanese analog television with an aspect ratio of 4x3 and 525 scan lines, the vertical and horizontal resolutions are approximately 340 and 330 lines, respectively. On the other hand, high definition television (HDTV, called Hi-Vision in Japan) with an aspect ratio of 16:9 has a higher resolution, and the number of effective vertical x horizontal pixels (pixels, a portmanteau of pix , short for pictures, and el , short for element) equivalent to the vertical x horizontal resolution of BS (broadcasting satellite) digital Hi-Vision with 1125 scan lines is approximately 1100 x 1900. In digital cameras, performance is measured by the total number of CCD (charge coupled device) elements used, for example 1 to 5 million pixels. The resolution of an output image is the number of dots that a printer can resolve per inch (dpi = dots per inch), and is displayed as horizontal resolution x vertical resolution, for example, 1440 x 720 dpi. On a computer or other display, it is expressed as the number of light points that can be displayed horizontally and vertically across the entire image. In conventional camera lenses and photosensitive materials for silver halide photography, the term "resolution" is used. [Tanaka Shunichi] [Reference] | | | |Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
テレビ、デジタルカメラなどの画像の分解能力を表す量。テレビでは、見分けられる横線の数を垂直解像度、縦線の数を水平解像度という。垂直解像度は走査線数に依存して決まり、在来のアスペクト比(横縦比)4×3、走査線数525本の日本のアナログテレビの場合、垂直、水平解像度はそれぞれ約340本、330本である。一方、アスペクト比16対9の高精細度テレビHDTV(high definition TV。日本ではハイビジョンという)は解像度が高く、走査線数1125本のBS(broadcasting satellite。放送衛星)デジタルハイビジョンの、垂直×水平解像度に相当する有効垂直×水平画素(ピクセルpixel。picturesの短縮形pixとelementのelでつくられた造語)数は約1100×1900である。 デジタルカメラでは、性能は用いるCCD(charge coupled device。電荷結合素子)の素子の総数で、たとえば100~500万画素のように表示される。 出力画像の解像度は、プリンターの場合1インチ当り分解できるドット数(dpi=dot per inch)で、たとえば水平解像度×垂直解像度の形で1440×720dpiのように表示する。パソコンなどのディスプレーの場合は画像全体で横、縦にいくつの光点を表示できるかで表す。 在来の銀塩写真用のカメラレンズや感光材料では、用語に「解像力」が使われる。 [田中俊一] [参照項目] | | | |出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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