It is important to pay attention to features of WDR performance. That is to say, a camera without good WDR function will have problems in brightness, gray scale response, saturation, color area identification, inaccurate color rendition，smearing，contrast and definition. Below is the comparison of PIXIM WDR and CCD WDR:

Most of the advantages of Pixim's innovative Digital Pixel System image capture and processing technology are easy to see: video images with high resolution, natural color and superb accuracy, and free of image-compromising visual noise, regardless of a scene's lighting conditions.The Digital Pixel System advantages do not stop with the visually obvious, however. Behind the scenes, Pixim's all-digital technology yields more highly compressed images that can dramatically reduce the costs of moving and storing security video in both analog and IP networked installations.This paper outlines how Pixim's Digital Pixel System technology is able to deliver compression advantages for users of video security systems.

A brief overview of Digital Pixel System technology

The Digital Pixel System technology features a unique architecture and tightly coupled imaging software, which enable superior image quality even under highly variable lighting conditions and in wide dynamic range scenes that have both dark and bright areas.

With the Digital Pixel System, every pixel is essentially a separate, independent camera.

How Digital Pixel System technology affects compression

Noise reduction and elimination.Pixim's Digital Pixel System technology is based on intelligent exposure, color and noise processing algorithms that maximize the SNR under all lighting conditions. With Digital Pixel System technology, every pixel is converted to digital format immediately when it is captured - and it remains in digital format from end to end until it leaves the camera. As a result, once the pixel is initially captured, there is no way to introduce noise into the file at any point during image processing.

CCD Image	Digital Pixel System Image

Pixi's Digital Pixel System technology provides a true digital black level that is not modulated with random noise. (Both images were lightened by the same amount to enhance contrast for printing.)

Progressive capture vs. interlaced capture

The progressive capture approach, which is what the Digital Pixel System technology uses, captures every line of the image simultaneously. It is more like taking a single snapshot of the whole scene, so no combing artifacts or other noise can be introduced. The result is a clearer,cleaner image with a lower bit rate and smaller file size.

Interlaced	Progressive

Independent validation
Recently, Pixim worked with an independent test lab to test the new SEAWOLF core technology in typical security applications and found that main technology improved further, including sensitivity factor, effective resolution factor, 3D-DNR, etc. and verified the picture impression and superior performance. The results were quite impressive.