Technology Used in Network Cameras
Canon's network cameras integrate optical technologies with the image processing and network distribution technologies developed by Canon for high image quality, high functionality, and high performance.
High Image Quality, Advanced-Function Network Cameras
Delivering High-Quality, High-Frame-Rate Full HD Images and a Wide Range of Image Detection through Intelligent Functions
Canon's latest network cameras are capable of delivering Full HD (high-definition) video (1,920 x 1,080 pixels) at a maximum frame rate of 30 frames per second (fps). In addition to conventional JPEG image compression, the cameras include H.264 format compression for superior image quality at higher compression rates, enabling the operation of high-quality security systems while reducing the bandwidth burden on networks. The web-browser-based integrated viewer makes it easy to remotely monitor video and control the cameras.
The network cameras deliver color video under low-light conditions, an important feature for surveillance systems. This is made possible by Canon's proprietary bright lenses and image-processing algorithms, which effectively minimize noise in dark areas, a common challenge when capturing video in low-light environments.
In addition, the cameras employ the same DIGIC DV III image processor incorporated in the EOS C300 digital cinema camera to deliver exceptional image quality and low-noise performance as well as superior color reproduction and smooth color gradation.
Canon's DIGIC NET II network video processor, which includes dedicated image-detection circuits, offers various intelligent functions capable of detecting changes in a scene, such as when a subject passes in front of the camera, an intruder or suspicious object enters the field of view, the camera is tampered with, or an object is removed. These functions use the background subtraction method, a new algorithm that detects changes in an image by identifying differences between the current scene and a set baseline scene. Conventional motion-detection methods work by comparing image frames with earlier images, an operation unreliable at detecting slow or partial changes. The new algorithm analyzes differences based on the background, making it possible to continually assess entire objects.
Delivering improved compatibility across an entire security system, Canon was quick to ensure that its latest network cameras support the ONVIF*1 industry standard protocol and the new ONVIF Profile S functional authentication system.
In addition, the company's fixed-dome models include a tool enabling the camera angle to be set. This feature allows users to remotely operate the camera while viewing images from a connected PC, facilitating such operations as setting the camera angle and toggling the angle of view and focus, procedures which were difficult to do using conventional systems. This function is particularly useful when operating wall-mounted cameras.
Example of Intelligent Function Operation
Comparison of Background Subtraction and Conventional Methods
- *1 ONVIF (Open Network Video Interface Forum): Standard for protocol system used by network cameras and recording servers
Network Video-Recording Software
Monitoring and Recording of Remote Video over a Network
Network video-recording software can be used to remotely control network cameras installed in multiple locations, and to record video images from them to a server, while simultaneously allowing them to be displayed on monitors.
In conjunction with intelligent functions of the camera, recording can be started when various events are detected, and control of external devices such as security lamps is also possible. Canon's network video-recording software supports the latest video compression technology, H.264, recording high-quality video with small data sizes, making it possible to reduce system costs such as HDD (hard disk drive) costs.