Methods for mitigating lag in image sensor devices
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.
1. A method of mitigating lag for an image sensor device, the method comprising:
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.
2. The method of claim 1 , further comprising applying dithering to the row of data before truncating the row of data.
3. The method of claim 2 , further comprising performing raw pixel data processing with the row of data.
4. The method of claim 1 , wherein scaling the row of data using the truncated row data from the N−1th frame further comprises subtracting the truncated row data from the N−1th frame from the row of data.
5. The method of claim 1 , wherein scaling the row of data using the truncated row data from the N−1th frame further comprises scaling the truncated row data from the N−1th frame using a reset duration and frame rate.
6. The method of claim 5 , further applying dithering to the truncated row data.
7. The method of claim 1 , wherein truncating the row of data further comprises truncating using a truncating number based on a value for a group of pixels.
8. The method of claim 7 , further comprising multiplying the value for the group of pixels by 2 i where i is an integer greater than zero.
9. A method of mitigating lag for an image sensor device, the method comprising:
reading a row of data from an Nth frame of image data from an image sensor device;
performing raw pixel data processing to the row of data;
reading a truncated row of data from an N−1th frame of image data from a memory operatively coupled with the image sensor device;
scaling the truncated row of data using reset duration and frame rate to form a scaled truncated row of data;
subtracting the scaled truncated row of data from the row of data to form lag corrected row 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.
10. The method of claim 9 , wherein the row of data in Nth frame has a row number that is the same as a row number of the truncated row of data from the N−1th frame.
11. The method of claim 9 , wherein truncating the row of data further comprises truncating the row of data's least significant bits using a position of the row in the Nth frame and a desired lag correction.
12. The method of claim 9 , further comprising applying dithering to the row of data before truncating the row of data.
13. The method of claim 9 , further comprising applying dithering to the truncated row data after scaling the truncated row of data.
14. The method of claim 9 , wherein truncating the row of data further comprises truncating using a truncating number based on a value for a group of pixels.
15. The method of claim 14 , further comprising multiplying the value for the group of pixels by 2 i where i is an integer greater than zero.
16. The method of claim 9 , wherein truncating the row of data to form truncated row data from the Nth frame further comprising truncating until residual most significant bits by row position equal zero.
17. A method of mitigating lag for an image sensor device, the method comprising:
setting a row number to zero for a first frame of image data;
reading a row of data from the first frame of image data from an image sensor device;
performing raw pixel data processing to the row of data;
truncating the row of data to form truncated row data from the first frame; and
storing the truncated row data from the first frame in a memory operatively coupled with the image sensor device.
18. The method of claim 17 , further comprising, for a second frame:
reading a row of data from the second frame of image data;
performing raw pixel data processing to the row of data;
reading the truncated row of data from the first frame of image data from the memory;
scaling the truncated row of data using reset duration and frame rate to form a scaled truncated row of data;
subtracting the scaled truncated row of data from the row of data from the second frame of image data to form lag corrected row data;
outputting the lag corrected row of data;
truncating the row of data to form truncated row data from the second frame; and
storing the truncated row data from the second frame in the memory.
19. The method of claim 18 , further comprising repeating for all rows in the second frame of image data.
20. The method of claim 17 , further comprising repeating for all rows in the first frame of image data except for setting the row number to zero for the first frame.