Cheetah Pregius Camera with GigE Vision
®
Interface – User Manual
August 27, 2019
Page
114
of
123
Rev 1.0
6.2 Spectral Sensitivity
A set of color filters (red, green, and blue) arranged in a Bayer pattern over the pixels
generates color images. The starting color is Red for SONY Pregius image sensors and follows
the pattern: red, green, red, green, red, … on row 1 and green, blue, green, blue, green, … on
row 2 and so on. The color and monochrome spectral responses of the sensors used in
Cheetah cameras can be found in
6.3 Micro-polarized Cameras
Light travels in electromagnetic waves that vibrate in multiple, random directions. When
these unpolarized light waves strike certain surfaces, they tend to reflect or refract light and
obscure the imaging target. A polarizer filter integrated into the camera can block certain light
waves from reaching the image sensor and thereby improve image quality.
The Sony IMX250MY/ZR and IMX253MY/ZR image sensors in the Cheetah POE-C2410Y/Z and
POE-C4110Y/Z cameras include a micro-polarizer filter that blocks light waves based on a
polarization angle. The filter consists of an array of four polarizers grouped in a 2x2 sub-array.
As shown in the following illustration, each array covers a block of four pixels in the sensor
with each polarizer absorbing light at one of four angles -- 90 degrees, 45 degrees, 135
degrees, or 0 degrees.
Figure 71:
The POE-C2410Y/Z and POE-C4110Y/Z cameras micro-polarizer blocks image
obscuring light waves from reaching the sensor
