Vivotek Supreme IP8151 Guía de referencia rápida

VIVOTEK Supreme Series

Professional Network Camera- IP8151

White Paper

For Internal Use Only.

Contents

1. Introduction.................................................................................... 3

2. Sensor Technology........................................................................ 4

3. Application..................................................................................... 5

4. Real-time H.264 1.3 Megapixel...................................................... 8

5. Conclusion..................................................................................... 9

For Internal Use Only.

1. Introduction

IP8151 represents the first in VIVOTEK’s SUPREME series of

professional security cameras, integrating a host of professional features

and unparalleled image quality for discerning users and demanding

applications. One of the key characteristics of the IP8151 is the newly

developed SONY Exmor11.3 Megapixel CMOS image sensor, designed

for situations which require exceptional performance in nighttime and low

light conditions. While megapixel cameras traditionally require a high

level of lighting for maximum picture clarity, with the improvement in new

sensor technology, the resulting IP8151 camera offers as one of its

significant features Supreme Night Visibility.

Fig.1 IP8151 is the first VIVOTEK Supreme Series network camera.

A conventional megapixel image sensor is the same size as a standard

VGACMOS sensor, with more pixels at a smaller size in the same area to

achieve the improved picture clarity. The drawback of this traditional

sensor design is that the change in light sensitivity raises the dB value of

the signal-to-noise ratio. In other words, a traditional megapixel CMOS

sensor produces more noise under low light conditions due to its physical

limitations, resulting in more light required for a clearer picture.

To combat this, VIVOTEK utilizes sensor technology and digital signal

1Exmor is a trademark of SONY Corporation.

For Internal Use Only.

processing for higher sensitivity by increasing the amount of light

captured and reduce noise when analog-digital (A/D) conversion, thereby

improving the low light performance of a megapixel IP camera. Supreme

Night Visibility is a key feature of VIVOTEK’s latest product offerings,

allowing for low light visibility in color equal or better to that of traditional

analog or CCD cameras. First introduced in the IP8330, and with

continued refinement in the IP8151, this feature is key for users looking

for exceptional low light visibility.

2. Sensor Technology

The sensor technology used in the IP8151 is a groundbreaking

technology developed by SONY for the Exmor sensor, featuring the

column-parallel A/D conversion technique that meets or surpasses the

performance of CCD sensors while retaining the benefits of CMOS. This

new generation of CMOS sensors combines high sensitivity with low

noise, eliminating the traditional drawbacks of megapixel CMOS sensors.

As shown in Figure2, a pixel on a CMOS sensor consists of an on-chip

micro-lens, color filter, and inner lens to collect light, followed by the

wiring layer and photodiode. When the light passes through the micro

lens, color filter, and inner lens, it reaches the photodiode for

photon-to-digital conversion. Between the inner lens and the photodiode

is the wiring layer. If the wiring layer is too thick, it inhibits or obstructs

photon gathering, and thus reduces the light sensitivity of sensor. On the

other hand, by using copper (Cu) wiring to reduce the thickness of the

wiring layer, it allows the light to be collected effectively. As a result, the

camera provides color images with excellent sensitivity and visibility,

even in nighttime conditions.

Fig. 2 Cross-section of a pixel on a CMOS sensor.

Conventional Structure Structure with Cu Wiring

Micro lens

Color filter

Al wiring

Light receiving surface

Photodiode

Inner lens

Cu wiring

For Internal Use Only.

3. Noise Reduction

High quality video and images rely on not only the image sensor, but also

the image signal processing (ISP) technology, which has been the

expertise of VIVOTEK for complete integration of the components of

camera sensor technology.

As the light signals are converted into electrical signals by the photodiode

array, these signals are then sent to the analog-to-digital conversion

(ADC) circuits, located adjacent to the photodiode on the upper portion of

the chip. Electronic noise is generated during the conversion process of

analog signals reaching the A/D converter (Figure 3). Under certain

conditions, even the occurrence of single-electron noise will be visible in

the image.

The new A/D conversion circuit design enables automatic noise

cancellation and reduction to dramatically improve the image quality of

analog signals before A/D conversion. After conversion, the noise is

further reduced for noise-free signals and unparalleled image quality

(Figure 4).

Fig. 3 Signal processing in a conventional CMOS sensor.

Noise

Reduction

Noise

Build-up

For Internal Use Only.

Fig.4 Signal processing in the SONY Exmor sensor.

4. Application

SONY’s Exmor has already been deployed in consumer electronics such

as digital cameras and digital camcorders and has proven to be a great

success in capturing video in low light conditions. Thus, with the IP8151,

which features the IMX035 sensor specifically designed for the security

market, this next-generation camera can surpass the performance of

traditional cameras in low light environments.

Although most IP camera vendors recommend a minimum of 40 pixels

per foot in a scene to capture details such as license plates or faces,

during nighttime and poor lighting conditions, this can grow to as many as

120 pixels per foot. With the improved light sensitivity of the IP8151, a

scene which may have required 120 pixels per foot previously may be

recognizable at 95 pixels per foot or lower, even in low light conditions!

Thus, a scene which may have required a higher megapixel camera may

now easily be captured with the 1.3MP IP8151 camera.

Let’s look at a real-world example where security is prevalent: casinos.

The lighting in the interior of a casino or around the gaming machines

may not provide enough ambient lighting to monitor activity clearly. At the

same time, bright lighting may not always be possible as they may

interfere with the atmosphere or décor of the locale. In such cases, the

Noise

Reduction Noise

Reduction

For Internal Use Only.

importance of monitoring with a suitable camera such as IP8151 with

sufficient performance in low light such is ideal. The megapixel resolution

can help to monitor important details much more clearly, with details such

as face recognition and players’ movements easily recognizable. At the

same time, low light sensitivity allows the camera maintain a high shutter

speed to avoid blurring that may occur when monitoring a moving object.

Fig.5 The additional clarity of the IP8151 results in more ease in distinguishing

vehicle features.

Another example where low lux megapixel cameras are ideal is highway

or traffic monitoring. Typically, an extremely high shutter speed is

required to capture vehicles moving at high speeds, especially for license

plate recognition. This may not be as difficult in day time, but at night,

merely a high shutter speed is not enough; it also needs to be paired with

more lighting and/or better light sensitivity. By utilizing the new VIVOTEK

IP8151 and the Exmor sensor for low light sensitivity, the additional clarity

results in clearer recognition of distinguishing vehicle features, offering

better clarity and a 15-20%+ improvement in pixels per foot required.

For Internal Use Only.

5. H.264 Real-time 1.3 Megapixel

In addition to low light sensitivity, the IP8151 has also adopted Texas

Instruments' newest video processor chipset named DaVinci2, which is

specifically geared toward professional video applications has a number

of features which also help to enhance image quality even further. The

chip itself features an ISP (Image Signal Processor) which allows for

additional processing of the raw video captured by the lens and sensor,

reducing the burden on the camera CPU and allowing for video quality on

the level of CCD sensors. Although CCD sensors are commonly believed

to feature better image quality than CMOS, the combination of the Exmor

sensor and DaVinci chipset has flattened these discrepancies, and offers

benefits such as reduction in phenomena such as blooming and

smearing which can commonly occur with CCD sensors.

Fig.6 The superb performance of the IP8151 is on par with CCD cameras, even

in night mode.

Beyond the ISP, the power of the DaVanci chipset allows for the perfect

transmission of 1.3-megapixel resolution video at 30fps compressed with

H.264. The H.264 compression technology is able to decrease bandwidth

usage and storage space up to 30% compared to MPEG4 and is the

common accepted standard for professional IP Surveillance today.

2DaVinci is a trademark of Texas Instruments.

For Internal Use Only.

6. Conclusion

Megapixel technology is one of the key driving factors behind the growth

of Network cameras. Traditionally, megapixel cameras require more light

to achieve the picture clarity for object identification. With 1.3-megapixel

being the most popular megapixel camera standard today, VIVOTEK has

explored how to achieve better image quality and usability through

integration of the latest technologies. By using not only the SONY Exmor

sensor for Supreme Night Visibility, but also 30fps, H.264, and much

more, the IP8151 sets the standard in all fields of surveillance

applications.

Fig.7 Example of Supreme Night Visibility of the IP8151 in an extremely low light

environment.

Note: All screenshots in this document were taken with a 60mm lens.

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