| 主权项 |
1. A radiation imaging system comprising:
a sensor unit including a plurality of pixels arranged in a matrix, and configured to convert a radiation into an electric charge and to output a pixel output value; a detecting unit configured to detect an irradiation start of the radiation; a control unit to perform (A) a first reset operation (A1) for resetting the plurality of pixels according to an interlace scanning until the detection of the irradiation start of the radiation by the detecting unit, a first accumulating operation (A2) for accumulating the electric charge in response to the detection of the irradiation start of the radiation by the detecting unit by stopping the first reset operation, and, thereafter, a first read out operation (A3) for reading out a pixel output value of the plurality of pixels in response to an irradiation end of the radiation so as to output an image information based on the irradiation of the radiation, and to further perform (B) a second reset operation (B1) for resetting the plurality of pixels according to the interlace scanning after the first read out operation, a second accumulating operation (B2) for accumulating the electric charge by stopping the second reset operation and a second read out operation (B3) for reading out the pixel output value so as to output a dark image information in accordance with the second accumulating operation, wherein the operations (A1), (A2), (A3), (B1), (B2) and (B3) are performed in this order; a first correcting unit configured to perform a correction by subtracting the dark image information from the image information based on the irradiation of the radiation; a second correcting unit configured to perform a correction of the image information after the correction by the first correcting unit, so as to correct (1) a level shift formed in the image information between an odd row and an even row of the pixels due to the interlace reset operation and to correct (2) a level shift formed in the image information between a row of the pixels scanned before stopping the interlace reset operation and a row of the pixels scanned after stopping the interlace reset operation. |
