The Moving Image
A video or film camera has a lens that focuses an image of the world onto a light-sensitive electronic sensor (see Fig. 1-4) or a piece of light-sensitive film (see Fig. 1-31). This part of the process is much like a still camera. But how do we capture movement? The impression of continuous movement in a motion picture is really an illusion. A film or video camera records a sequence of still images (frames) in rapid succession (see Fig. 1-2). In film, the standard frame rate is 24 frames per second, written 24 fps. When the images are then displayed one after another on a screen (for example, a theater screen or a TV), if the frames in the sequence change from one to the next quickly enough and the differences between them are not too great, the brain perceives smooth, realistic motion. This effect brings the magic of motion to film, video, and flip books
The Moving ImageA video or film camera has a lens that focuses an image of the world onto a light-sensitive electronic sensor (see Fig. 1-4) or a piece of light-sensitive film (see Fig. 1-31). This part of the process is much like a still camera. But how do we capture movement? The impression of continuous movement in a motion picture is really an illusion. A film or video camera records a sequence of still images (frames) in rapid succession (see Fig. 1-2). In film, the standard frame rate is 24 frames per second, written 24 fps. When the images are then displayed one after another on a screen (for example, a theater screen or a TV), if the frames in the sequence change from one to the next quickly enough and the differences between them are not too great, the brain perceives smooth, realistic motion. This effect brings the magic of motion to film, video, and flip books
การแปล กรุณารอสักครู่..
