Mapping electrical crosstalk in pixelated sensor arrays
View Patent ↗The effects of inter pixel capacitance in a pixilated array may be measured by first resetting all pixels in the array to a first voltage, where a first image is read out, followed by resetting only a subset of pixels in the array to a second voltage, where a second image is read out, where the difference in the first and second images provide information about the inter pixel capacitance. Other embodiments are described and claimed.
1. A system comprising:
an array of pixels; and
a controller coupled to the array of pixels, the controller configured to:
acquire a first family of images, wherein each image in the first family of images is a first image based on setting a reset voltage of each pixel in the array to a first voltage;
acquire a second family of images, wherein each image in the second family of images is a second image based on setting only those pixels in a subset of the array to a second voltage, the first voltage being different from the second voltage, the subset being less than an entirety of pixels in the array of pixels, and wherein each image in the second family of images is based on a different subset of pixels in the array; and
form a family of difference images, wherein each difference image in the family of difference images is formed based on a difference between one image in the first family of images and one image in the second family of images.
2. The system as set forth in claim 1 , where the family of subsets covers the array.
3. The system as set forth in claim 1 , wherein the first image is based on an average of voltage readouts by the controller based on setting the reset voltage of each pixel in the array to the first voltage, and the second image is based on an average of voltage readouts by the controller based on setting only those pixels in the subset of the array to the second voltage.
4. A system comprising:
an array of pixels; and
a controller coupled to the array of pixels, the controller configured to:
acquire a first family of images, wherein each image in the first family of images is a first image based on setting a reset voltage of each pixel in the array to a first voltage;
acquire a second family of images, wherein each image in the second family of images is a second image based on setting only those pixels in a subset of the array to a second voltage, the first voltage being different from the second voltage, and wherein each image in the second family of images is based on a different subset of pixels in the array;
acquire a first averaged image based on an average of images in the first family of images;
acquire a second averaged image based on an average of images in the second family of images; and
form an averaged difference image based on a difference between the first and second averaged images.
5. The system as set forth in claim 1 , the controller is further configured to perform calculation of one or more coupling factors between pixels in the array of pixels based on the family of difference images.
6. The system as set forth in claim 5 , wherein each coupling factor in the one or more coupling factors is between a particular pixel and at least one nearest neighbor or at least one next-to-nearest neighbor of the particular pixel.
7. The system as set forth in claim 5 , wherein the one or more coupling factors are capacitive coupling factors.
8. The system as set forth in claim 5 , wherein the perform calculation is selected from the group consisting of simulated annealing calculation methods, perturbation calculation methods, Green's function calculation methods, and matrix inversion calculation methods.