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Video cameras record live-action scenes that are available for viewing via a stored or transmitted video feed.
Cameras function by capturing light from the visible spectrum as well others parts of the electromagnetic spectrum. Older model video cameras use photographic film to record the light spectrum on a plastic strip covered with light-sensitive silver-halide salts.
To reproduce the images captured on film stock, the film roll must be unwound and passed in front of a light. Newer model video capture devices have done away with the analog film prevalent in the 20th Century.
Charge coupled devices (CCDs) are light-sensitive silicon chips that detect electrons excited by incoming light. Complementary metal oxide semiconductor (CMOS) image sensors operate at lower voltages than charged coupled devices (CCDs), reducing power consumption for portable applications. Charge injection devices (CIDs) are photosensitive image sensors that are often implemented with large-scale integration technologies. Two of the more common types of image sensors, CCD and CMOS, use different methods to electronically archive images, as explained above. For both digital and photochemical recording, the resolution of the images is largely dependent upon the quality of the camera lens, but other attributes affect picture quality as well. Regardless of the image capture method of the camera, the lens remains the most critical component regarding  high-quality video capture.
C-mount lenses have a flange-back distance of 17.5 mm and are required for C-mount cameras.
CS-mount cameras can use both C-mount and CS-mount lenses; however, C-mount lenses require either a 5 mm adapter or adjustments to the CS-mount camera. S-mount is a smaller mounting configuration used in devices such as PC cameras and board-mounted cameras. PAL stands for 'phase alternating line' and was developed to specifically compensate for the shortcomings of NTSC, notably color shifting due to poor broadcasting. DTMB(Digital Terrestrial Multimedia Broadcast) was developed in China to replace analog broadcasts beginning in 2008. DVB-T(Digital Video Broadcast - Terrestrial) is a European based standard for the broadcast of highly-developed video feeds.
Using a telecommunications relay satellite, video feeds are transmitted to receivers positioned on the Earth, be it a parabolic satellite dish or a satellite tuner. Both digital and analog radio transmissions can be received on mobile display devices, like portable TVs, cell phones, and tablet computers. Since the advent of digital television, video services are available in conjunction with internet subscriptions via the use of an Ethernet cable. Using coaxial cables to receive video broadcasts is becoming less popular, but is still prevalent. Instances that will use security cameras often have a closed circuit with a direct connection to a display. Security cameras are often mounted to a wall or ceiling by an adjustable arm bracket with standard hardware, providing pan and tilt functions. Entertainment cameras are valued for their aesthetic picture quality, and are almost always mounted on a stand of some type since they are attended.
These specifications are often optional on video cameras, but depending upon the use they will enhance video quality. Anti-Blooming: Saturation occurs when the light that is sensed exceeds a pixel's capacity to emit electrons.
Auto-Lens: Auto-lens operation is a mode in which the lens iris automatically adjusts to maintain a predetermined level of light on the image pickup device. Dome: Cameras are enclosed in a protective dome made from materials such as acrylic or polycarbonate.
Gain Control: Automatic gain control (AGC) uses electronic circuitry to increase video signals in low-light conditions. Gamma Correction: Gamma is the nonlinear relationship between the video signal level and the subsequent image element brightness.
High Definition: High definition is a video standard that has higher picture sharpness, larger picture, more colors, and higher quality sound than regular video standards. High-Speed Camera: High-speed cameras record images at a higher frame rate than a typical camera. Outdoor Rated: Outdoor-rated devices are designed to withstand outdoor temperature variations, rain, snow, and other weather conditions.
Zoom: Cameras are designed with a feature that allows the device to closely focus on distant objects.
3D Recording: The camera has the capability of recording images in three distinct directional planes.
Video cameras are very versatile, and as such, hundreds of styles with different features are available depending upon the application. These types of cameras are useful for recording feature films, television shows and commercials, news broadcasts, sports events, web casts, and other types of motion capture that is meant for high-quality distribution. Industrial cameras are meant for troubleshooting, accident detection and investigation, counting, color mark recognition, flaw detection, and remote monitoring. Cameras meant for scientific research and studies usually have some proprietary feature not incorporated into other camera styles in order to aid in a specific function of the research. Security cameras are prevalent in many urban areas, as well as locations where valuable goods may be kept. Complementary metal oxide semiconductor (CMOS) cameras use image sensors that operate at lower voltages than charged coupled devices (CCDs), reducing power consumption for portable applications. Low light cameras are a type of video camera with extreme photon sensitivity, and are excellent for recording in situations where only ambient levels of light are available. Vision sensors are industrial products that automate decisions and processes by the use of video cameras linked to application-specific software on a user interface.
I look at a lot of APIs--some are crap, some make sense, a few are interesting, and every great once in a while you see an API that you know will be one of the next big API platforms. Evercam.io was born out of experience working at a cloud CCTV company, where the Evercam team realized the opportunity was about becoming a developer platform that enabled any developer to interact with potentially hundreds of types of cameras, while also applying modern API techniques to the world of security and webcams. StorageWhen it comes to video, the obvious API usage involve storage of the video, still photos, audio, and logs generated by a video camera.
ConnectivityCameras are just one node, in this fast growing world of Internet connected devices that you may find at home or in the business. Events Evercam.io introduces events as a layer between the camera and users, allowing developers to define custom or scheduled events based upon what happens in a video.
LoggingOne of the significant benefits of API layers between camera and their access layers is the ability to log operations. MarketplaceAny successful platform needs a marketplace, where developers can showcase the applications they've engineered on top of the platform, and even generate revenue through application sales and add-ons. Security Deployment of an API for one or many cameras, provides a single point of security for all devices. Our homes and automobiles will be increasingly wired with cameras, businesses will be operated, managed and secured through cameras, and governments will increasingly monitor citizens via Internet connected video devices.
I predict the Evercam.io ecosystem will grow rapidly, and be an interesting, and potentially scary place to watch our world be connected to the Internet via billions of tiny cameras, that track on every aspect of our personal, business and increasingly very public lives.
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This is controlled by only allowing light into the recording chamber through a hollow tube called the aperture. When the frame is alit, the images captured on the film stock are projected away from the film stock. They contain micro circuitry that transfers a detected signal along a row of discrete picture elements or pixels, scanning the image very rapidly. Analog and digital processing functions can be integrated readily onto a CMOS chip, reducing system package size and overall cost. While CCDs were more popular during the early years of image sensor technology, developments in lithography have provided CMOS image sensors with an industry resurgence. This depends largely upon the application today, though it is suspected that digital video recording may make film videography obsolete eventually. For digital cameras, they are the number of pixels used, the effect of the image filter, and the processing algorithm used to interpret sensor pixels to image pixels. Lenses are meant to refine optical aberrations that occur when recording video, and there is a wide variety of camera lenses for various recording scenarios. Because of their shorter back focal distance, CS-mount lenses can be used only with CS-mount cameras. For digital cameras, resolution depends upon the number of pixels (horizontally and vertically). Film cameras can have the equivalent of 50 megapixels or more if the camera uses medium or large format film.
The human eye is capable of differentiating between 10 to 12 separate images per second; anything more and the rapidly changing images creates the illusion of movement. It is a number that represents how sensitive a camera is, and a lower number lux sees better in less light.
This can be done by the use of storage devices, such as VHS cassettes or data storage devices, or by electronic frequency transmissions.
NTSC has a lower resolution than PAL or SECAM, but has a faster frame rate to reduce flicker.
This provides a resolution enhancement six times better than NTSC, though it is capable of transmitting NTSC video feeds as well. DTMB has a clear depiction whether received on a mobile or fixed antenna, a notable upgrade of ATSC. The data is split in a large number of slow digital streams to adjacent carrier frequencies. This allows video to be transmitted to very remote locations, and also allows for the transference of data information. Ethernet is a local area network (LAN) protocol that uses a bus or star typology and supports data transfer rates of 10 Mbps. This method offers considerably less reviewing options, and does not support data transfer. Some hardware video-storage formats such as VHS, Betamax, and DVD, are subject to the analog broadcast standards mentioned above (PAL, NTSC, SECAM), as well as regional restrictions emplaced by film distribution companies.
Industrial cameras are usually mounted with brackets or a separate type of mount that limits the device's movements. The stand may include wheels to provide object tracking, a suspension system to keep objects in focus, and other conveniences for the camera operator. Excessive charge can bleed into adjacent pixels and cause bright spots or streaks to appear on the image, a condition known as blooming.
Gamma correction compensates for this nonlinearity in order to render the image true in color while providing intensity to the original object. After recording, the images can be played back in slow-motion for close study of actions that may be ephemeral.
The cameras contain image sensors that are exceptionally perceptive of subtle light sources. These cameras can be used in nuclear facility applications, or in scientific research that will expose the device to radiation.
These cameras are characterized by a standardized frame rate to make their replay mechanisms compatible for use in a particular market's entertainment devices.
The video quality of industrial-employed cameras is usually unimportant, provided it can accurately record and depict motion imaging. This could include low-light settings, submersible components, extremely high frame rates, clean-room compatibility, recordings of different light spectrums, miniature sizes, or resistance to chemicals and wear. Of the three types of digital cameras (the others being CMOS and CID), CCD cameras are the most developed and commonly used. This allows for the slow-motion analysis of fleeting details and motion that would not be observable with a standard video camera.
Whether its its for home or commercial usage, Internet connected cameras represents low hanging fruit for applying proven API techniques.
The cloud opens the ability to scale storage to match whatever needs the camera owner may have. The ability to sync up cameras and still photos with point of sale (POS) activity, sensors or even other cloud applications is significant. Examples include sending of MMS when camera receives SMS from owner, take picture of storefront or dining area each hour or during peak hours.
Camera availability, access logs, events, actions and basically any interaction with a camera potentially can be logged. I think Evercam.io will be big because it represents a fairly obvious target for applying APIs, and the deployment of cameras, as well as the use of video is only going to grow--exponentially. Camera APIs will be one of the most influential, yet silent players in our personal and professional lives, from here on forward—there is no escaping it.
I try to help lead the API space by shining the light on some of the positive in the space, while calling out potentially negative practices. These are every day uses that will have significant implications on the economy and become regular part of business operations. I’m interested in seeing what solutions get developed on the platform, how security is handled, and what issues arise in different scenarios when you connect cameras to the Internet, apply APIs and start building applications and logging tools that operate in this new API defined space. Electronic Access Control Systems  that secure your building and let you know who went where at what time.
Originally this rapid viewing rate was responsible for the first color films, as each frame would have a red or green filter to it, which the viewer would individually interpret because of the eye's sensitivity to these colors. Even with less-than-modern video cassette players, this was the method used to transmit videos to screens and monitors. Image sensors turn visible light into electronic signals with information to determine the signal's organization when the picture is recreated. With CMOS, each active pixel sensor cell has its own buffer amplifier and can be addressed and read individually.
Because of their shorter back focal distance, CS-mount lenses cannot be used with C-mount cameras.
At a standard size, more pixels sharpen details on a photograph, but when enlarged the pixels become apparent in an effect called pixelization. Film resolution is also dependent upon the exposure and the quality of grain the film uses. Frame rate of individual cameras is very much reliant upon the playback method and territory, or the specific application of the camera, both of which are covered in depth below. Instead of color information being transmitted all at once, in SECAM the color differences are transmitted separately and in alternating fashion. DTMB is transmitted in encrypted signals, which allows for better frequency estimations and the broadcasting of analog, digital, and multimedia signals.


Integrated Services Digital Broadcasting is responsible for data transmission as well, enabling interactive programming.
In this instance, the compressed video information is interpreted by the device and then displayed. Security cameras can be mounted inconspicuously to record individuals surreptitiously, or prominently to deter misbehavior. Entertainment cameras also have unique mounts produced for them to capture irregular camera angles, or may have entire vehicles dedicated to their operation. If they are not uniform machines, the camera is typically linked to a computer interface via a FireWire, USB, or Ethernet connection.
These types of cameras almost always use film stock instead of digital frame rendering because of the lack of image noise when displayed at large dimensions. In fact, due to the environment of their use, some features may be purposefully left out to reduce costs. These cameras can be used to research everything from space exploration to molecular biology. Video potentially can be disk heavy, something that is perfectly suited for the cloud, as long as someone is willing to pay for the storage.
Zapier and IFTTT like actions or seamless reporting and analytics across systems will open up with API deployent. When used for security, this API layer expands on the existing definition of what a security camera is used for.
This one element will make or break platforms like Evercam, and is the area that will keep me up at night when thinking about API driven cameras. Light entering the aperture is controlled by a shutter, usually within the lens mechanism; it controls the length of exposure. Color images rely on the interpolation (or the average light intensity from nearby, filtered neighboring pixels) of light to produce an estimated color. Video collected by image sensors recreates scenes by digitally recreating them sequentially.
Digital cameras are typically more expensive than comparable photochemical models, but it does not cost anything to develop digital recordings. This allows a higher number of programs to be transmitted compared to a multi-frequency network. This type of transmission is called "hi-vision." Main differences of ISDB include the transmission of video through unused TV frequencies (even for radio), and the advent of rights management protection, which embeds data into programming to mechanically enforce copyrights.
Broadcast transmissions can be reflected by mountains or the Earth's curvature, so satellite transmissions reduce the amount of obstacles that can interfere with the radio waves. Most digital television broadcasts must be simultaneously transmitted in a different frequency and bandwidth range.
This method of video recording is also used for webcasts, where a camera is connected to an internet connection and the scene captured is available for viewers worldwide. Scientific cameras utilize whatever mount best suits the research, which may mean atypical placement.
Almost all modern high-speed cameras are digital in design and capable of recording over 1000 frames per second. Progressive scan cameras are used for image acquisition of rapidly moving objects and accurate dimensional measurements.
These cameras usually have high connectivity, so the image feeds can be relayed to multiple recording devices, transmitters, or computers.
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High-end film video cameras may utilize a rotary shutter to expose negatives accurately.
Monochrome image sensors do not need a filter applied, so each pixel has an accurate greyscale measurement based upon light intensity in each pixel. Image sensors cannot recognize the color of light, only the level of light (or, more accurately, the number of photons in each pixel).
Each cell has a transfer gate that separates the photo sensor from a capacitive floating diffusion and a reset gate between the floating diffusion and the power supply. In theory, CMOS imaging should be cheaper due to their ease of manufacture, but because of its additional production and development to create parity with a CCD device, CMOS imagers are often more expensive than CCD imagers. It is much less expensive to archive digital files for future use, but considering the rapidly developing nature of computer technology, some digital formats may face obsoletion. Digital camera resolution is commonly measured in megapixels (MPx), with each mega representing one million square pixels.
These mounts may apply by temporary means, may be exceptionally small, or the camera may not be mounted at all.
Too many frames per second sacrifices area coverage while also producing a large, unwieldy file. These types of cameras are sometimes used for unique recording and replay experiences, like for 3D films or IMAX theaters.
Scientific cameras can often do away with a synced audio feed in order to cut down their adverse expense. These cameras are also used to provide a reliable chronicle of events, which can be used to identify and prosecute alleged criminals. This also means that color image sensors have less sensitivity to light, so monochrome recording may be better for low-light situations. Each cell also has a source-follower transistor to buffer the floating diffusion from readout-line capacitance, and a row-select gate to connect the cell to the readout line. CCD imagers are less susceptible to noise, consume extremely more power than similarly-capable CMOS imagers, and offer more pixels.
Film, on the other hand, has existed for more than 150 years, and the already-extensive catalog of photochemical film archives ensures film's foreseeable future. These cameras will also have a sound recording unit, whether integral or part of a double-system recording. Their advanced development means that they are often implemented in less-expensive, low-power devices like cell phone and simple security cameras. These cameras are also available with extremely small footprints or disguises to aid in espionage or covert surveillance. When the pixel patterns are viewed as a two-pixel by two-pixel square, the camera averages the four colors to create an estimate of the correct color.
CMOS imaging is often reserved for high-performance professional and industry camera-types. Audio feeds are optional with this type of camera, but some cameras placed in pugnacious locations can automatically detect gunshots and alert authorities. Many of our clients already have a Video Surveillance System in place, but do require System Maintenance and Repair from time to time. Manufacturing Facilities Whatever type of business you have, chances are we can design a Video Surveillance Security System of great benefit to your business. Please call (281) 558-4334 for more info or Contact Us.Who is watching yourBusiness or Property?You Can! This not only allowed our Guard Shack to monitor the cameras, but the management now has access in their offices as well as from anywhere in the world!  Thanks.



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