IMAGE SUB-SAMPLING WITH A COLOR GRID ARRAY
One example apparatus for image sub-sampling with a color grid array includes a super-pixel comprising an array of pixels, each pixel comprising a photodiode configured to generate a charge in response to incoming light, a filter positioned to filter the incoming light, a charge storage device to convert the charge to a voltage, a row-select switch, and a column-select switch; an analog-to-digital converter (“ADC”) connected to each of the charge storage devices of the super-pixel via the respective row-select and column-select switches and configured to selectively convert each respective stored voltage into a pixel value in response to a control signal; and wherein each row-select and column-select switch for a pixel is configured to selectively allow the charge or the voltage to propagate to the respective ADC, the row-select and column-select switches arranged in series.
1 . A sensor apparatus comprising:
a super-pixel comprising an array of pixels, each pixel comprising a photodiode configured to generate a charge in response to incoming light, a filter positioned to filter the incoming light, a charge storage device to convert the charge to a voltage, a row-select switch, and a column-select switch;
an analog-to-digital converter (“ADC”) connected to each of the charge storage devices of the super-pixel via the respective row-select and column-select switches and configured to selectively convert each respective stored voltage into a pixel value in response to a control signal; and
wherein each row-select and column-select switch for a pixel is configured to selectively allow the charge or the voltage to propagate to the respective ADC, the row-select and column-select switches arranged in series.
2 . The sensor apparatus of claim 1 , wherein each pixel has a different filter from the other pixels in the array.
3 . The sensor apparatus of claim 1 , wherein the filters of the array of pixels include one or more of a red filter, a green filter, a blue filter, an infra-red filter, or an ultraviolet filter.
4 . The sensor apparatus of claim 1 , further comprising a plurality of super-pixels arranged in an array.
5 . The sensor apparatus of claim 4 , wherein each super-pixel includes a 2×2 array of pixels.
6 . The sensor apparatus of claim 4 , further comprising a pixel configuration controller configured to:
receive pixel control information for one or more super-pixels;
selectively control row-select and column-select switches for each of the one or more super-pixels; and
transmit the control signal to each of the super-pixels.
7 . The sensor apparatus of claim 1 , wherein, for each pixel, at least one of the row-select switch or column-select switch is connected between the photodiode and the charge storage device.
8 . The sensor apparatus of claim 1 , wherein, for each pixel, at least one of the row-select switch or column-select switch is connected between the charge storage device and the ADC.
9 . The sensor apparatus of claim 1 , further comprising, for each pixel, an anti-blooming transistor.
10 . The sensor apparatus of claim 1 , wherein the pixels are formed in a first layer of a semiconductor substrate and the ADC is formed in a second layer of the semiconductor substrate.
11 . A sensor apparatus comprising:
an array of super-pixels arranged in rows and columns, each super-pixel of the array of super-pixels comprising an array of pixels arranged in rows and columns and an analog-to-digital converter (ADC) connected to each pixel,
each pixel comprising a photodiode configured to generate a charge in response to incoming light, a filter positioned to filter the incoming light, a charge storage device to convert the charge to a voltage, a row-select switch, and a column-select switch, wherein each row-select and column-select switch for a pixel is configured to selectively allow the charge or the voltage to propagate to the respective ADC, the row-select and column-select switches arranged in series;
a plurality of row-select lines, each row-select line corresponding to a row of pixels within a row of super-pixels in the array of super-pixels, each row-select line connected to row-select switches of the pixels within the respective row of pixels;
a plurality of column-select lines, each column-select line corresponding to a column of pixels within a column of super-pixels in the array of super-pixels, each column-select line connected to column -select switches of the pixels within the respective column of pixels; and
a plurality of ADC enable lines, each ADC enable line configured to provide a control signal to enable at least one ADC.
12 . The sensor apparatus of claim 11 , wherein each pixel array comprises four pixels arranged in a 2×2 array.
13 . The sensor apparatus of claim 12 , wherein a first filter of each pixel array comprises a red filter, a second filter of each pixel array comprises a green filter, and a third filter of each pixel array comprises a blue filter.
14 . The sensor apparatus of claim 11 , wherein, for each pixel, at least one of the row-select switch or column-select switch is connected between the photodiode and the charge storage device.
15 . The sensor apparatus of claim 11 , wherein, for each pixel, at least one of the row-select switch or column-select switch is connected between the charge storage device and the respective ADC.
16 . The sensor apparatus of claim 11 , further comprising, for each pixel, an anti-blooming transistor.
17 . The sensor apparatus of claim 11 , wherein the pixels of each super-pixel are formed in a first layer of a semiconductor substrate and the ADC of each super-pixel is formed in a second layer of the semiconductor substrate.
18 . A method performed using a sensor apparatus comprising an array of super-pixels, each super-pixel comprising a plurality of pixels and being connected to an analog-to-digital converter (ADC), wherein each pixel for a super-pixel has a corresponding row-select switch and column-select switch, arranged in series, to allow a signal to propagate to the ADC when both switches are enabled, the method comprising:
converting, by photodiodes of the pixels, incoming light in to electric charge;
enabling a first row-select line, the first row-select line coupled to row-select switches in a first set of pixels in a first set of super-pixels of the array of super-pixels;
enabling a first column-select line, the first column-select line coupled to column-select switches in a second set of pixels in a second set of super-pixels of the array of super-pixels; and
generating, using the ADC corresponding to a super-pixel in both the first and second sets of super-pixels, a pixel value for each pixel of the respective super-pixel having both a row-select switch and column-select switch closed.
19 . The method of claim 18 , wherein each super-pixel comprises four pixels arranged in a 2×2 pixel array, and wherein a first filter of each 2×2 pixel array comprises a red filter, a second filter of each 2×2 pixel array comprises a green filter, and a third filter of each 2×2 pixel array comprises a blue filter, and the method further comprising:
enabling a plurality of row-select and column-select lines corresponding only to pixels having a first color filter.
20 . The method of claim 18 , wherein each super-pixel comprises four pixels arranged in a 2×2 pixel array, and wherein a first filter of each 2×2 pixel array comprises a red filter, a second filter of each 2×2 pixel array comprises a green filter, and a third filter of each 2×2 pixel array comprises a blue filter, and the method further comprising:
enabling a first plurality of row-select and column-select lines corresponding only to pixels having a red filter;
enabling a first plurality of row-select and column-select lines corresponding only to pixels having a green filter; and
enabling a first plurality of row-select and column-select lines corresponding only to pixels having a blue filter.