Pixim-Powered cameras provide the surveillance market with something truly unique—the Digital Pixel System ® technology. Not only is Pixim’s technology the only all-digital image solution, but it is the only technology to employ hundreds of thousands of pixels each acting like individual cameras. These constantly self-adjusting pixels eliminate image-compromising visual noise and deliver high-resolution, natural color, and clarity. The result is simply unparalleled image quality regardless of lighting conditions or applications.
Pixim’s patented Digital Pixel System ® technology marks a fundamental breakthrough in imaging technology. Building upon technology developed at Stanford University in the 1990s, Pixim has created an image capture and processing system that provides high-quality pictures with enhanced dynamic range. Greater dynamic range significantly improves image quality in scenes consisting of both bright and dark areas.
The core invention in the Digital Pixel System technology is the inclusion of an analog-to-digital converter (ADC) within each pixel of the image sensor. The ADC translates the light signal into a digital value at the immediate point of capture, thus minimizing signal degradation and cross-talk in the array and allowing for greater noise reduction methods. Once the data is captured in a digital format, a variety of digital signal processing techniques are used for optimal image reproduction.
Because each pixel has its own analog-to-digital converter and the information generated is captured and processed independently, each pixel in effect acts as its own camera. The exposure time for each pixel is adjusted to handle the unique lighting conditions at that pixel location in the image sensor array. A product built with the Digital Pixel System platform essentially has hundreds of thousands of individual cameras, each of which produces the best image possible. These images are then combined to create a high quality video frame or picture.
In contrast, other technologies typically set one exposure time for the frame and sample each pixel at that time – resulting in images with some pixels that are underexposed (too dark) and some that are overexposed (too bright).
Pixim’s Video Imaging System, is comprised of a digital image sensor and a digital image processor. The digital image sensor and digital image processor function much like the eyes and brain in humans, with two-way real-time interactivity to capture the highest quality image possible. Just as the brain of a person walking into a dark room instructs the eyes to open the pupil to allow in more light, the digital image processor loads new code into the sensor to alter not only exposure times but the actual image capture algorithms. The result: the best possible picture given the specific image characteristics and lighting conditions.
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