There is a need for security cameras to film with clear images in a variety of environments. Sony's image sensors meet this need by providing high-sensitivity performance suitable for night filming.
The STARVIS is back-illuminated pixel technology used in CMOS image sensors for security camera applications. It features a sensitivity of 2000 mV or more per 1 µm2 (color product, when imaging with a 706 cd/m2 light source, F5.6 in 1 s accumulation equivalent), and realizes high picture quality in the visible-light and near infrared light regions.
Customers may use the "STARVIS" logo with Sony's approval in the following circumstances only. Before provision of the logo data, a logo usage agreement will be concluded with the customer. Please contact a sales office in your area for details.
Products: customers' products incorporating Sony's CMOS image sensors equipped with STARVIS technology.
Materials/Media: product packaging, catalogs, posters, informational websites and other promotional materials, as well as fixtures at exhibitions (panels, etc.) relating to the above mentioned products
Unlike the front-illuminated-type image sensor, the image is acquired through the back side where
there are no obstacles such as wiring or circuits, so a wider range of light is collected on the photodiode,
achieving high sensitivity. Moreover, it uses the very first pixel specifically developed
for security use in a back-illuminated structure.
Sony is introducing SNR1s [lx] as an index used to quantitatively evaluate picture quality at low illumination. SNR1s [lx] is a proprietary index advocated by Sony, and is limited to CMOS image sensors for security camera applications.
A smaller value indicates better picture quality at low illumination.
SNR1s [lx] is an acronym consisting of "SNR" (Signal-to-Noise Ratio), "1" (represents that the signal level when noise = 1 is 1), and "s" (for Security).
|SNR1s [lx] Prescribed Conditions|
|Light Source||3200 [K]|
|Target Object||18% Grey|
|Exposure time||1/60 [s]|
|Signal||G [e-] (Sensor Raw Output)|
|Noise||√Shot Noise[e-] 2 + Dark Noise[e-] 2|
|Signal : Noise||1 : 1|
Note：SNR1s is a new index proposed by Sony for picture quality at low illumination, and is limited to CMOS image sensors for security applications.
Figure 1 shows a schematic of SNR1s measurement.
Two 3200 [K] light sources illuminate an 18% gray chart from different directions, and dimming is performed to 100 [lx]. A camera is placed so that the distance from the gray chart to the imaging surface of the image sensor is 1 m, the sensitivity [e-] and dark noise [e-] are measured, and SNR1s [lx] is calculated using the relational equation (1). The luminance when equation (1) equals 1 is SNR1s [lx].
For further details, contact your local Sony's sales company.
Darkness arouses unease. To capture images even in dark areas and ensure peace of mind, efficient capture of near-infrared light is essential. Sony's photodetectors are made with the optimum structure to capture near-infrared light and provide clear images even in darkness.
With many security camera images in which light and dark regions coexist, there is a need to clearly capture both regions.
To meet this need, this technology enables both the light and dark regions to be captured clearly to achieve higher security camera visual recognition performance.