A field is one half of a frame, with 262.5 lines in the NTSC standard. The full number of lines in the NTSC standard is 525. It takes two interlaced fields to make up a full frame. Interlaced television monitors display their images in two steps. The first step paints every other line, while the second paints the remaining ones. In that case it takes sixty fields per second to equal thirty frames per second. It is sometimes referred to as IPS or images per second.

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Most security cameras, especially analog ones, will use an interlaced method of capturing images. Many true digital sensors like the ones used in Pixim cameras will use a progressive scan method of capturing images. Progressive scan will provide a much smoother image where a lot of motion is present than can be presented with an interlaced scan method.

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