Enhanced Dynamic Range Image Processing
The present disclosure relates to a system and method for an enhanced dynamic range image sensor. In some implementations, multiple A/D converters may be applied to sample a plurality of image exposure data while camera shutter remains open.
1 . An image capture system for capturing a plurality of image data, the system comprising:
an image sensor comprising a plurality of light sensitive elements, the plurality of light sensitive elements comprising a first grouping of elements; and
a first A/D converter operable to acquire data from the first grouping of elements via a first acquisition and a second acquisition, wherein a camera shutter is operable to open allowing light to be sensed by the plurality of light sensing elements throughout the first acquisition and the second acquisition.
2 . The image capture system according to claim 1 , wherein the first acquisition comprises reading data corresponding to a plurality of pixels of the first grouping and the second acquisition comprises reading data corresponding to the plurality of pixels of the first grouping.
3 . The image capture system according to claim 1 , wherein the first acquisition corresponds to a first exposure and the second acquisition corresponds to a second exposure.
4 . The image capture system of claim 3 , wherein the second exposure is longer than the first exposure.
5 . The image capture system of claim 3 , further comprising a processor, the processor configured to combine first acquisition data acquired at the first exposure and second acquisition data acquired at the second exposure to generate an enhanced dynamic range image.
6 . The image capture system of claim 5 , further comprising a second grouping of the plurality of light sensitive elements.
7 . The image capture system of claim 6 , further comprising a second A/D converter operable to acquire data from the second grouping via a first acquisition and a second acquisition while the camera shutter is open.
8 . The image capture system of claim 7 , wherein the first A/D converter is operable to acquire data from the first grouping of elements via a third acquisition corresponding to a third exposure, the third exposure being longer than the first exposure and the second exposure.
9 . A method of capturing a plurality of image data, the method comprising:
exposing an image sensor comprising a plurality of elements;
reading image data corresponding to the plurality of elements during the exposing to generate a plurality of image exposures; and
storing the image exposures to a first buffer, wherein a shutter remains open throughout the reading of the image data.
10 . The method according to claim 9 , wherein the plurality of elements corresponds to a plurality of pixels configured to capture the image data.
11 . The method according to claim 10 , wherein the reading is processed by a plurality of A/D converters.
12 . The method according to claim 11 , wherein each of the plurality of A/D converters read a grouping of the plurality of pixels.
13 . The method according to claim 12 , wherein the reading of the image data is acquired during the capture of at least one video image of a sequence of video images.
14 . The method according to claim 13 , wherein the sequence of video images are captured by the image sensor concurrently with the plurality of image exposures.
15 . The method according to claim 9 , further comprising combining the plurality of image exposures to generate an enhanced dynamic range image.
16 . An apparatus for capturing a plurality of image data, the apparatus comprising:
a camera shutter;
an image sensor a plurality of groups of elements;
a plurality of image processing pipelines, each of the image processing pipelines corresponding to at least one of the groups of elements; and
at least one circuit configured to:
open the camera shutter to expose the plurality of elements; and
acquire data from at least one of the plurality of image processing pipelines through a plurality of data acquisitions from at least one of the plurality of groups of elements, wherein the camera shutter is open throughout the plurality of data acquisitions.
17 . The apparatus according to claim 16 , wherein at least one of the plurality of image processing pipelines comprises an A/D converter, the A/D converter configured to perform the plurality of acquisitions.
18 . The apparatus according to claim 17 , wherein the plurality of acquisitions comprises a first acquisition comprising acquiring data corresponding to a plurality of pixels of at least one of the plurality of groups of elements and a second acquisition comprising acquiring data corresponding to the plurality of pixels of the at least one of the plurality of groups of elements.
19 . The apparatus according to claim 18 , wherein at least one of the plurality of image processing pipelines comprises a register configured to store data from the A/D converter.
20 . The apparatus according to claim 16 , further comprising at least one buffer configured to receive the data from at least one of the plurality of image processing pipelines.