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公开(公告)号：US11800040B2
公开(公告)日：2023-10-24
申请号：US17326332
申请日：2021-05-21
Applicant: Axis AB
Inventor： Johan Jeppsson Karlin , Jimmie Jönsson
Abstract: The present disclosure relates to a method performed by a deviation analyzing system (1) for black level drift assessment of a digital camera image sensor (21). The deviation analyzing system measures (1001) for pixels of an image captured by the image sensor, a respective luminance value and corresponding chromaticity value of each pixel. The deviation analyzing system further determines (1002) a respective average chromaticity value for differing luminance levels of the measured luminance values, based on for each luminance level averaging the corresponding measured chromaticity values. Moreover, the deviation analyzing system determines (1003), when the respective average chromaticity values of a range (4) of luminance levels indicate—to a predeterminable extent—chromaticity deviations (5) from the respective average chromaticity values (6) of other luminance levels (7), that a black level setting of the image sensor is drifted from a true black level.
The disclosure also relates to a deviation analyzing system in accordance with the foregoing, a digital camera comprising such a deviation analyzing system, and a respective corresponding computer program product and non-volatile computer readable storage medium.-
公开(公告)号：US12063460B2
公开(公告)日：2024-08-13
申请号：US17943263
申请日：2022-09-13
Applicant: Axis AB
Inventor： Gunnar Dahlgren , Johan Jeppsson Karlin
Abstract: A method for suppressing chromatic aberration, especially blue or red fringing, in a digital image with multiple color channels is disclosed. The method comprises negatively correcting a first color channel by subtracting an overshoot component of the first color channel. The subtraction is subject to a lower threshold, which is dependent on a local value of at least one further color channel.
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公开(公告)号：US11653084B2
公开(公告)日：2023-05-16
申请号：US17463392
申请日：2021-08-31
Applicant: Axis AB
Inventor： Björn Benderius , Jimmie Jönsson , Johan Jeppsson Karlin , Niclas Svensson
CPC classification number: H04N23/617 , G06T7/70 , G06V20/41 , H04N23/61 , H04N23/76 , G06T2207/10016 , G06V20/44 , H04N23/71
Abstract: A method of configuring a camera comprising: collecting a video data with the camera, providing a plurality of imaging profiles, each imaging profile being associated with a set of scene characteristics, for each imaging profile, generating a spatial output data in dependence on the video data and the set of scene characteristics of the imaging profile, wherein the spatial output data is indicative of spatial locations of events detected in the video data matching one or more of the scene characteristics, performing a comparison of the spatial output data of each of the plurality of imaging profiles, selecting a preferred imaging profile in dependence on the comparison, configuring the camera to operate according to the preferred imaging profile.
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公开(公告)号：US11631183B2
公开(公告)日：2023-04-18
申请号：US17485514
申请日：2021-09-27
Applicant: Axis AB
Inventor： Jimmie Jönsson , Johan Jeppsson Karlin
Abstract: The present disclosure relates to a method of motion segmentation (100) in a video stream. The method comprises the steps of: acquiring (101) a sequence of image frames; dividing (102) a first frame (401) into a plurality of image blocks (403); comparing (103) each image block (403) against a corresponding reference image block (404) and providing a measure of dissimilarity; for image blocks having a measure of dissimilarity less than a threshold: discarding (104a) the image blocks, and for image blocks having a measure of dissimilarity greater than the threshold: keeping (104b) the image blocks and further dividing the image blocks into a new plurality of image blocks (405); repeating the steps of dividing (102) and comparing (103) until a stop condition is met (105a); generating (106) a motion mask (407) indicating areas of movement (408).
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