Video camera

A video camera takes moving pictures.

It can show things live. This means you see them right away. It can also save the video. It can save pictures to a small chip. Some cameras are very small. You can even use one on a phone. Some cameras work in space. They help scientists see far away. You can use one to watch for safety.

These tools help us see the world.

A video camera is a tool that captures video.

It works in two main ways. First, it can show live video. This sends images to a screen right away. This helps with security or military work. Second, it can save video to a device.

People used videotape for a long time. Now, most use flash memory or hard disks.

There are many kinds of cameras. Camcorders have a camera and a recorder in one unit. Some cameras are made for science. They might work on a space probe. Some even use X-rays to see inside the body. Other cameras use infrared, which is light we cannot see. This helps with night vision.

Old cameras used tubes to work. New cameras use sensors. One type is called a CCD. This is a sensor that makes digital video. Another type is called a CMOS sensor. These sensors made digital video much easier to use. Some cameras also use different lenses. You can swap lenses using a mount. This is a part that connects the lens to the camera.

A video camera is a tool that captures moving images.

Unlike a movie camera, it does not use film. Instead, it uses electronic ways to see and save pictures. These cameras are used in many different ways. Some cameras show live video to a screen right away. This is helpful for security or military work. Other cameras save the video to a storage device. This lets people watch the video later for analysis.

There are many ways these tools work. Professional cameras often use three sensors. These sensors record red, green, and blue colors separately. Many modern cameras are also camcorders. This means the camera and the recorder are one unit. Some cameras are built for very hard jobs. They might work in high heat or toxic chemicals. Some even go on space probes or satellites. These special cameras can see things humans cannot. They use infrared light for heat sensing or X-rays for medicine.

Learning about cameras involves looking at a long history. Early cameras used a spinning disk called a Nipkow disk. Later, people used tubes to capture images. Vladimir Zworykin made the Iconoscope tube. Philo Farnsworth made the image dissector tube. These tube designs were used for many years. By the 1980s, things began to change. New sensors replaced the old tubes. These sensors are called solid-state sensors. They helped make digital video much more practical.

Important discoveries happened at places like Bell Labs. Scientists there invented the MOSFET in 1959. This led to the creation of semiconductor sensors. The first charge-coupled device, or CCD, was invented at Bell Labs in 1969. Later, Olympus invented the NMOS active-pixel sensor in 1985. NASA's Jet Propulsion Laboratory developed the CMOS sensor in 1993. To save space, cameras use a trick called compression. A method called the discrete cosine transform was proposed in 1972. This helps video fit onto small memory cards.

Recording video has changed a lot over time. In 1927, John Logie Baird tried to record video on discs. This was called Phonovision. In 1951, scientists first tried using tape. Ampex released the first Quadruplex videotape system in 1956. They even made a color system two years later. Sony made the DV-2400 in 1967 to help people record outside. Today, you might use a smartphone to record 4K video. You can even swap lenses using different mounts.

A video camera is an optical instrument designed to capture moving images. It differs from a movie camera because it does not record images on physical film. Instead, video cameras use electronic processes to capture light. These devices are vital tools in our modern world. They allow us to witness events as they happen or save them for later study. Today, video cameras serve many different industries, from television broadcasting to scientific research.

Video cameras generally operate in two distinct modes. The first mode is live television. In this setup, the camera feeds real-time images directly to a screen for immediate viewing. While many cameras still serve live television production, this mode is also used for security, military, and industrial operations. This allows for remote or surreptitious viewing. The second mode involves recording images to a storage device. This allows for archiving or later processing. For many years, videotape was the primary format for recording. Over time, this was replaced by optical discs, hard disks, and eventually flash memory.

There are many different types of video cameras designed for specific tasks. Professional video cameras are often used in television studios. They can also be mobile, which is known as electronic field production, or EFP. These professional models often give the operator fine-grained manual control. Many of these cameras use three separate sensors to record red, green, and blue colors. Camcorders are another common type. A camcorder combines a camera and a recording device into one single unit. These are highly mobile and are used for home movies, news gathering, and citizen journalism. Modern digital camcorders usually have built-in recording media.

Other specialized cameras serve very different purposes. Action cameras can sometimes provide 360° recording capabilities. For security and surveillance, people often use closed-circuit television, or CCTV. These often use pan–tilt–zoom cameras, known as PTZ cameras. These are designed to be small, easy to hide, and able to work without human help. Some cameras are even built for hostile environments. They might be used in places with high heat, radiation, or toxic chemicals. Special systems are also used in medicine, robotics, and space research. Some of these cameras can even see non-visible radiation, such as infrared for heat sensing or X-rays for astronomy.

The history of the video camera is a journey of technological shifts. The earliest models relied on a mechanical device called the Nipkow disk. These were used in experimental broadcasts between the 1910s and the 1930s. Eventually, all-electronic designs replaced the mechanical systems. Two important inventions were the Iconoscope, created by Vladimir Zworykin, and the image dissector, created by Philo Farnsworth. These tube-based designs remained common until the 1980s. During that decade, solid-state image sensors began to replace the older tubes. These new sensors, such as the charge-coupled device (CCD), eliminated problems like image burn-in and streaking. This shift made digital video workflows practical for everyone.

Much of this progress came from breakthroughs in semiconductor technology. In 1959, the invention of the MOSFET at Bell Labs provided the foundation for metal–oxide–semiconductor (MOS) technology. This led to the development of semiconductor image sensors. The first CCD was invented at Bell Labs in 1969 using MOS capacitor technology. Later, the NMOS active-pixel sensor was invented at Olympus in 1985. This paved the way for the CMOS active-pixel sensor, which was developed at NASA's Jet Propulsion Laboratory in 1993. Digital video was also made possible by video compression. The discrete cosine transform (DCT) was a vital lossy compression technique proposed in 1972. This allowed video to fit within limited memory and bandwidth.

Recording methods have also evolved significantly. In 1927, John Logie Baird attempted to record video using a disc-based system called Phonovision. While the discs could not be played at the time, the video was later recovered in the 1980s. The first experiments with video tape began in 1951. By 1956, Ampex released the first commercial Quadruplex videotape system. They introduced a color video system just two years later. Mobile recording became easier with the Sony DV-2400 in 1967. By 1981, the Betacam system allowed the tape recorder to be built into the camera. Today, even high-end smartphones can capture video in 4K resolution. Many cameras also use interchangeable lenses via different mounts, such as the Sony E mount.