Still image stabilization suitable for compact camera environments
First Claim
Patent Images
1. An apparatus, comprising:
- an image sensor operable to capture image segments during corresponding exposure intervals of a frame exposure period;
a motion sensor operable to generate respective motion sensor signals during the respective exposure intervals of the image segments, wherein the motion sensor comprises image sensing elements operable to capture images of a scene; and
a processing system operable to determine from the respective motion sensor signals one or more corresponding movement measures for each of the exposure intervals and combine the image segments into an output image based on the one or more corresponding movement measures, wherein the processing system is operable to determine the movement measures from comparisons of ones of the images captured by the image sensing elements of the motion sensor;
wherein at least a portion of the image sensing elements are further operable to capture the images in accordance with a rolling shutter process that is determined by;
EFP=eR+M*TR,
tE,i=(i−
1)*TR+t0,FP, and
tR,i=i*TR+eR+t0,FP,wherein eR denotes a scanline exposure interval, EFP denotes a frame exposure period, TR denotes readout time for each row of pixels, M is the number of rows of pixels in an active area of the image sensor, exposure of row i begins at time tE,i, t0,FP is a time at which frame exposure period FP begins, and readout of row i occurs at time tR,i.
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Abstract
Still image apparatus and methods that are suitable for compact camera environments are described. In another aspect, image segments are captured during corresponding exposure intervals of a frame exposure period. Respective motion sensor signals are generated during the respective exposure intervals of the image segments. One or more corresponding movement measures are determined from the respective motion sensor signals for each of the exposure intervals. The image segments are combined into an output image based on the one or more corresponding movement measures.
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Citations
18 Claims
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1. An apparatus, comprising:
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an image sensor operable to capture image segments during corresponding exposure intervals of a frame exposure period; a motion sensor operable to generate respective motion sensor signals during the respective exposure intervals of the image segments, wherein the motion sensor comprises image sensing elements operable to capture images of a scene; and a processing system operable to determine from the respective motion sensor signals one or more corresponding movement measures for each of the exposure intervals and combine the image segments into an output image based on the one or more corresponding movement measures, wherein the processing system is operable to determine the movement measures from comparisons of ones of the images captured by the image sensing elements of the motion sensor; wherein at least a portion of the image sensing elements are further operable to capture the images in accordance with a rolling shutter process that is determined by;
EFP=eR+M*TR,
tE,i=(i−
1)*TR+t0,FP, and
tR,i=i*TR+eR+t0,FP,wherein eR denotes a scanline exposure interval, EFP denotes a frame exposure period, TR denotes readout time for each row of pixels, M is the number of rows of pixels in an active area of the image sensor, exposure of row i begins at time tE,i, t0,FP is a time at which frame exposure period FP begins, and readout of row i occurs at time tR,i. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15, 16)
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8. A method, comprising:
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capturing image segments during corresponding exposure intervals of a frame exposure period; generating respective motion sensor signals during the respective exposure intervals of the image segments, wherein the generating comprises capturing images of a scene; determining from the respective motion sensor signals one or more corresponding movement measures for each of the exposure intervals, wherein the determining comprises deriving the movement measures from comparisons of ones of the captured images; and combining the image segments into an output image based on the one or more corresponding movement measures; wherein the movement measures are determined based on;
Ir(P)=It(P−
U(P)),
A=(XTX)−
1XTU, - View Dependent Claims (9, 10, 11, 12, 13, 17, 18)
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14. An apparatus, comprising:
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means for capturing image segments during corresponding exposure intervals of a frame exposure period; means for generating respective motion sensor signals during the respective exposure intervals of the image segments, wherein the means for generating comprises means for capturing images of a scene; means for determining from the respective motion sensor signals one or more corresponding movement measures for each of the exposure intervals, wherein the means for determining comprises means for deriving the movement measures from comparisons of ones of the captured images; and means for combining the image segments into an output image based on the one or more corresponding movement measures; wherein the means for capturing images of a scene captures images in accordance with a rolling shutter process that is determined by;
EFP=eR+M*TR,
TE,i=(i−
1)*TR+t0,FP, and
tR,i=i*TR+eR+t0,FP,wherein eR denotes a scanline exposure interval, EFP denotes a frame exposure period, TR denotes readout time for each row of pixels, M is the number of rows of pixels in an active area of the image sensor, exposure of row i begins at time tE,i, t0,FP is a time at which frame exposure period FP begins, and readout of row i occurs at time tR,i.
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Specification