US Patent 7619670 Rolling shutter for prevention of blooming

A rolling shutter technique for a pixel array is described in which multiple rows of the array are hard reset as the shutter moves down the array. As the rolling shutter progresses down the array, each row is hard reset multiple times before its integration period begins, thereby ensuring that the row is in a true hard reset condition at the beginning of its integration period. Also, multiple rows are hard reset in advance of the beginning of the integration period for a given row, thereby making it less likely that overexposed pixels several rows away will be able to distort the integrating row by blooming.