Column-based high dynamic range imaging systems
First Claim
1. An image sensor, comprising:
- an array of image pixels arranged in pixel rows and pixel columns;
a conductive column line coupled to each pixel column;
column readout circuitry coupled to the pixel columns through the conductive column lines; and
row control circuitry configured to operate the array of image pixels to capture a column-interleaved image with short-exposure pixel values and long-exposure pixel values that are interleaved in a column-based pattern, wherein the row control circuity comprises first and second reset lines coupled to each pixel row, wherein the first reset lines are coupled to a first set of pixels in each pixel row that capture the long-exposure pixel values and the second reset lines are coupled to a second set of pixels in each pixel row that capture the short-exposure pixel values, and wherein the row control circuitry is configured to provide reset control signals over the first and second reset lines to perform at least two resets of both the first and second sets of pixels between consecutive readouts of the long and short-exposure pixel values from the array of image pixels.
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Abstract
Electronic devices may have camera modules that include an image sensor and processing circuitry. An image sensor may include a pixel array having pixel rows and pixel columns. The image pixels in a pixel row may include long-integration pixels and short-integration pixels. Row control signal lines for each pixel row may include a row-select control line, a reset control line, and two transfer control lines or may include a row-select control line, two reset control lines, and a transfer control line. Row control circuitry may be used to operate the pixel array to capture a column-interleaved image with short-exposure pixel values and long-exposure pixel values interleaved in a column-based pattern. The column-interleaved image may be used to form an interpolated short-exposure image and an interpolated long-exposure image from which a column-based interleaved high-dynamic-range image is generated.
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Citations
12 Claims
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1. An image sensor, comprising:
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an array of image pixels arranged in pixel rows and pixel columns; a conductive column line coupled to each pixel column; column readout circuitry coupled to the pixel columns through the conductive column lines; and row control circuitry configured to operate the array of image pixels to capture a column-interleaved image with short-exposure pixel values and long-exposure pixel values that are interleaved in a column-based pattern, wherein the row control circuity comprises first and second reset lines coupled to each pixel row, wherein the first reset lines are coupled to a first set of pixels in each pixel row that capture the long-exposure pixel values and the second reset lines are coupled to a second set of pixels in each pixel row that capture the short-exposure pixel values, and wherein the row control circuitry is configured to provide reset control signals over the first and second reset lines to perform at least two resets of both the first and second sets of pixels between consecutive readouts of the long and short-exposure pixel values from the array of image pixels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system, comprising:
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a central processing unit; memory; input-output circuitry; an imaging device, wherein the imaging device comprises; an array of image pixels arranged in pixel rows and pixel columns, wherein each pixel row includes short-integration pixels and long-integration pixels, wherein both the long-integration pixels and the short-integration pixels are reset at a common time, wherein the short-integration pixels are configured to transfer short-exposure pixel values to first charge storage regions on the short-integration pixels after a first exposure duration from the common time, wherein the long-integration pixels are configured to transfer long-exposure pixel values to second charge storage regions on the long-integration pixels after a second exposure duration from the common time, wherein the second exposure duration is greater than the first exposure duration, a conductive column line coupled to each pixel column, and column readout circuitry coupled to the pixel columns through the conductive column lines, wherein the column readout circuitry is configured to read out the long-exposure pixel values from the second charge storage regions and the short-exposure pixel values from the first charge storage regions at a common readout time; and processing circuitry configured to generate a column-based interleaved high-dynamic-range image using a column-interleaved image captured by the array of image pixels. - View Dependent Claims (11, 12)
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Specification