Methods for mitigating lag in image sensor devices
AssigneeSemiconductor Components Industries, LLC
InventorNicholas Paul Cowley
Life of this patent
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Abstract
Implementations of a method of mitigating lag for an image sensor device may include reading a row of data from an Nth frame of image data from an image sensor device; correcting the row of data using truncated row data from an N−1th frame stored in a memory operatively coupled with the image sensor device to form a lag corrected row of data; outputting the lag corrected row of data; truncating the row of data to form truncated row data from the Nth frame; and storing the truncated row data from the Nth frame in the memory.
Claims20
A method of truncating row data for an image sensor device, the method comprising:
- applying a minimum truncation factor to a last row in a frame;
- calculating a first equivalent analog signal using an input corresponding with an analog-to-digital converter (ADC) full scale deflection less any applied offsets;
- subtracting the first equivalent analog signal from an original signal of the last row in the frame to form a first residual error signal;
- calculating a reference lag based on a first residual error and a lag for the last row in the frame;
- forming a first truncated row of data by applying a truncation factor increased by 1 to row data of a first row;
- calculating a second equivalent analog signal using a second input corresponding with the ADC full scale deflection less any applied offsets;
- subtracting the second equivalent analog signal from a first row signal to form a second residual error signal;
- calculating a resulting lag arising from a second residual error using the lag for the last row in the frame and the second residual error signal;
- determining a row position in the first row where the resulting lag is equal to the reference lag;
- and
- applying the minimum truncation factor to the first row.
A method of truncating row data for an image sensor device, the method comprising:
- applying a minimum truncation factor to a last row in a frame;
- calculating a first equivalent analog signal;
- subtracting the first equivalent analog signal from an original signal of the last row in the frame to form a first residual error signal;
- calculating a reference lag based on a first residual error and a lag for the last row in the frame;
- forming a first truncated row of data by applying a truncation factor increased by 1 to row data of a first row;
- calculating a second equivalent analog signal;
- subtracting the second equivalent analog signal from a first row signal to form a second residual error signal;
- calculating a resulting lag arising from a second residual error using the lag for the last row in the frame and the second residual error signal;
- determining a row position in the first row where the resulting lag is equal to the reference lag;
- and
- applying the minimum truncation factor to the first row.
A method of truncating row data for an image sensor device, the method comprising:
- applying a minimum truncation factor to a last row in a frame;
- calculating a first equivalent analog signal using an input corresponding with an analog-to-digital converter (ADC) full scale deflection less any applied offsets;
- subtracting the first equivalent analog signal from an original signal of the last row in the frame to form a residual error signal;
- calculating a reference lag by calculating a resulting lag arising from a first residual error using a lag for the last row in the frame and the residual error signal;
- and
- forming a truncated row of data by applying a truncation factor increased by 1 to row data.
Dependencies are inferred from the claim text.