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What is HD resolution?

The term HD is a nomenclature proposed in the middle of digital video. This scale thus indicates a video image in high definition. 720p is the code often used to also mark a video image in high definition. The number 720 indicates the sum of available lines over the width of the display surface. However, the letter p corresponds to the type of display, in this case a progressive scan – that is, the video image is displayed at once. This BOM also provides information about the display size of the image. This is usually 1280 x 720 pixels. The first number denotes the total of vertical lines, while the second counts as the sum of horizontal lines. Talking about HD resolution is of course an abuse of language, since we are talking here about image definition. Indeed, the resolution is another nomenclature that is expressed in pixels per inch (dpi). A spy camera with the mention HD thus has a video sensor capable of producing content in high definition. The higher classification than HD is Full HD – with the code 1080p and a display of 1920 x 1080 pixels.