GRR vs ERS – High Speed Machine Vision Comparison
GRR – Global Reset Release is a specialized mode in an ERS – Electronic Rolling Shutter image sensor that allows all pixel rows to reset and begin light integration simultaneously within the Hyperlux series from onsemi with a high CRA – Chief Ray Angle for low Z-heights.
An AR0830CSSM11SMKA1-CP image sensor running in both GRR and ERS modes was used to capture 2D barcodes on a disk rotating at 300 rpm (barcode linear motion of ~66 cm/sec). An exposure time of 150 s was used for both modes. In GRR mode, all rows are exposed simultaneously via a FLASH output signal synchronized 150 s illumination. In ERS mode, the same active illumination remains on for >30 ms (through the entire frame readout) and the exposure time of each row is electronically shuttered to be 150 s.
ERS Picture
GRR Picture
Comparison of ERS, Global Shutter and GRR mode
Global shutter and electronic rolling shutter technologies in image sensors have their respective benefits and usage in different market segments. For a given resolution, rolling shutter image sensors equipped with GRR mode offer a compelling economic alternative at a fraction of cost compared to the global shutter image sensor. onsemi has pioneered in both forms of shutter technology. The features in their electronic rolling shutter image sensors include GRR modes of operation and have been widely deployed as alternatives where desired to their global shutter equivalents.
For more details see the complete TND6496-D (GRR WP) What is Global Reset Release (GRR) White Paper of onsemi as pdf below:
TND6496-D (GRR WP) What is Global Reset Release (GRR) White Paper of onsemi.pdf (570.9 KB)