- 专利标题： METHOD FOR FIXED PATTERN NOISE REDUCTION AND USE OF SUCH METHOD
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申请号： EP17152224.6申请日： 2017-01-19
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公开(公告)号： EP3352454A1公开(公告)日： 2018-07-25
- 发明人: Johansson, Emanuel , Bengtsson, Jesper , Winzell, Thomas
- 申请人： Axis AB
- 申请人地址： Emdalavägen 14 223 69 Lund SE
- 专利权人： Axis AB
- 当前专利权人： Axis AB
- 当前专利权人地址： Emdalavägen 14 223 69 Lund SE
- 代理机构： AWA Sweden AB
- 主分类号： H04N5/365
- IPC分类号： H04N5/365 ; G06T5/00
摘要：
A method for structural fixed pattern noise reduction in a video stream comprises:
for each target pixel (116) in a first image frame (114)
defining a first target pixel patch (118) including the target pixel (116),
defining a first search area (120) comprising the first target pixel patch (118),
for each pixel in the first search area
comparing a first pixel (124) patch around the pixel with the first target pixel patch (118),
using the pixel when calulating an average for the target pixel (118) if the similarity of the pixel patch (124) and the first target pixel patch (118) is within a first threshold,
and,
in a second image frame (114')
localizing a second target pixel (114'),
defining a second pixel seach area (120') comprising the second target pixel (116'),
for each pixel in the second search area (120')
comparing a second pixel patch (124') around the pixel of the second search area (120') with the first target pixel patch (116),
using the pixel of the second search area (124') when calculating an average of the first target pixel (116) if the similarity of the second pixel patch (124') and the first target pixel patch (118) is within a second threshold,
wherein the first image frame (114) and the second image frame (114') are separate image frames in the videostream, and wherein the location of the second target pixel is estimated from the location of the first target pixel(116), combined with camera directional data.
for each target pixel (116) in a first image frame (114)
defining a first target pixel patch (118) including the target pixel (116),
defining a first search area (120) comprising the first target pixel patch (118),
for each pixel in the first search area
comparing a first pixel (124) patch around the pixel with the first target pixel patch (118),
using the pixel when calulating an average for the target pixel (118) if the similarity of the pixel patch (124) and the first target pixel patch (118) is within a first threshold,
and,
in a second image frame (114')
localizing a second target pixel (114'),
defining a second pixel seach area (120') comprising the second target pixel (116'),
for each pixel in the second search area (120')
comparing a second pixel patch (124') around the pixel of the second search area (120') with the first target pixel patch (116),
using the pixel of the second search area (124') when calculating an average of the first target pixel (116) if the similarity of the second pixel patch (124') and the first target pixel patch (118) is within a second threshold,
wherein the first image frame (114) and the second image frame (114') are separate image frames in the videostream, and wherein the location of the second target pixel is estimated from the location of the first target pixel(116), combined with camera directional data.
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