SNR Value

The Zivid Signal-to-Noise Ratio (SNR) is a measurement of pixel quality. Its value represents the measured SNR where the signal is the projected patterns. The SNR ranges from 0 to 255 (8-bits) and describes how well Zivid can read back the projected signal for a given pixel. The higher the SNR, the higher confidence Zivid has that it was able to correctly estimate the distance for that particular pixel. A low SNR will have more pixel noise in the 3D point cloud than a high SNR pixel from measurement to measurement. The SNR map in Zivid Studio provides a visual representation of the distribution of SNR values within a capture. Visit the Studio Guide for an introduction to the feature.

Signal and noise over light intensity

It is important to correctly expose the Zivid camera to get healthy SNR values. SNR should be above 7 to yield good precision. However, an SNR lower than 7 can be common for dark and specular objects and in the presence of strong ambient light. By properly Adjusting Filters, it is possible to get good 3D data with any SNR values.

For a more in depth tutorial on how to utilize SNR, see Getting the Right Exposure for Good Point Clouds.

Version History

SDK

Changes

2.12.0

With Box ROI, only the rectangular region of the ROI has non-zero SNR values.

2.8.0

The SNR map feature is added to Zivid Studio.