Patents by Inventor Anders Johannesson
Anders Johannesson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9536154Abstract: A method of monitoring a scene by a camera (7) comprises marking a part (14) of the scene with light having a predefined spectral content and a spatial verification pattern. An analysis image is captured of the scene by a sensor sensitive to the predefined spectral content. The analysis image is segmented based on the predefined spectral content, to find a candidate image region. A spatial pattern is detected in the candidate image region, and a characteristic of the detected spatial pattern is compared to a corresponding characteristic of the spatial verification pattern. If the characteristics match, the candidate image region is identified as a verified image region corresponding to the marked part (14) of the scene. Image data representing the scene is obtained, and image data corresponding to the verified image region is processed in a first manner, and remaining image data is processed in a second manner.Type: GrantFiled: May 8, 2014Date of Patent: January 3, 2017Assignee: Axis ABInventors: Markus Skans, Anders Johannesson, Jiandan Chen, Joakim Baltsen
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Patent number: 9438814Abstract: The present invention relates to a method (300) for reducing stray light in an output image of a scene, said method comprising; providing (301) a camera (100) comprising a lens assembly (102, 202), providing (302) an aperture unit (103, 203) having an aperture gate (204a, 204b) in an aperture plane being orthogonal to an optical axis (OA) of said lens assembly (102, 202), said aperture gate (204a, 204b) being adjustable in said aperture plane, acquiring (303), by means of said camera (100), a plurality of images of said scene, wherein each image of said plurality of images is acquired using an unique aperture gate setting, wherein each of said unique aperture gate settings correspond to a unique combination of a position and a shape of said aperture gate (204a, 204b) in said aperture plane, analyzing (305) said plurality of images for generating data pertaining to a difference in stray light content with respect to said plurality of images, and producing (306) said output image based on said data pertaining tType: GrantFiled: April 24, 2014Date of Patent: September 6, 2016Assignee: AXIS ABInventors: Jonas Hjelmstrom, Anders Johannesson
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Patent number: 8982228Abstract: An image acquisition device and a method for capturing image data is disclosed. The method comprises exposing an image sensor to light from a scene, selecting substantially all rows of sensor pixels in an image sensor in a substantially random order, starting an exposure period for each row of sensor pixels in the image sensor in the order the rows were selected, buffering the rows of sensor pixels comprised in an image frame until all rows of the image frame have registered image data for the presently captured image frame, and outputting image data representing the image frame by outputting image data from each row of sensor pixels.Type: GrantFiled: September 26, 2013Date of Patent: March 17, 2015Assignee: AXIS ABInventors: Per Kannermark, Anders Johannesson
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Patent number: 8908046Abstract: There is provided a method for determining the reliability of a fault detection of a camera in a camera system. According to the method data relating to environmental conditions are received (204) and compared to accessed (202) criteria relating to environmental conditions external to the camera and affecting the reliability of the fault detection test. If the received data complies with the criteria it is determined (206) that the fault detection test gives a reliable result. This is advantageous in that false fault detection tests may be identified.Type: GrantFiled: April 9, 2014Date of Patent: December 9, 2014Assignee: Axis ABInventors: Anders Johannesson, Stefan Lundberg, Wilfried Rakow
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Publication number: 20140340525Abstract: There is provided a method for determining the reliability of a fault detection of a camera in a camera system. According to the method data relating to environmental conditions are received (204) and compared to accessed (202) criteria relating to environmental conditions external to the camera and affecting the reliability of the fault detection test. If the received data complies with the criteria it is determined (206) that the fault detection test gives a reliable result. This is advantageous in that false fault detection tests may be identified.Type: ApplicationFiled: April 9, 2014Publication date: November 20, 2014Applicant: Axis ABInventors: Anders Johannesson, Stefan Lundberg, Wilfried Rakow
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Publication number: 20140334676Abstract: A method of monitoring a scene by a camera (7) comprises marking a part (14) of the scene with light having a predefined spectral content and a spatial verification pattern. An analysis image is captured of the scene by a sensor sensitive to the predefined spectral content. The analysis image is segmented based on the predefined spectral content, to find a candidate image region. A spatial pattern is detected in the candidate image region, and a characteristic of the detected spatial pattern is compared to a corresponding characteristic of the spatial verification pattern. If the characteristics match, the candidate image region is identified as a verified image region corresponding to the marked part (14) of the scene. Image data representing the scene is obtained, and image data corresponding to the verified image region is processed in a first manner, and remaining image data is processed in a second manner.Type: ApplicationFiled: May 8, 2014Publication date: November 13, 2014Applicant: Axis ABInventors: Markus SKANS, Anders Johannesson, Jiandan Chen, Joakim Baltsen
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Publication number: 20140320686Abstract: The present invention relates to a method (300) for reducing stray light in an output image of a scene, said method comprising; providing (301) a camera (100) comprising a lens assembly (102, 202), providing (302) an aperture unit (103, 203) having an aperture gate (204a, 204b) in an aperture plane being orthogonal to an optical axis (OA) of said lens assembly (102, 202), said aperture gate (204a, 204b) being adjustable in said aperture plane, acquiring (303), by means of said camera (100), a plurality of images of said scene, wherein each image of said plurality of images is acquired using an unique aperture gate setting, wherein each of said unique aperture gate settings correspond to a unique combination of a position and a shape of said aperture gate (204a, 204b) in said aperture plane, analyzing (305) said plurality of images for generating data pertaining to a difference in stray light content with respect to said plurality of images, and producing (306) said output image based on said data pertaining tType: ApplicationFiled: April 24, 2014Publication date: October 30, 2014Applicant: Axis ABInventors: Jonas HJELMSTROM, Anders Johannesson
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Patent number: 8848198Abstract: A method for determining a tilt of an image sensor surface plane in a camera in relation to a lens reference plane of the camera includes sending light onto the image sensor, receiving light reflected from the image sensor, identifying an interference pattern in the reflected light, identifying a feature of the interference pattern, and determining the tilt of the image sensor surface plane based on a position of the feature identified in the interference pattern.Type: GrantFiled: July 19, 2012Date of Patent: September 30, 2014Assignee: Axis ABInventors: Jonas Hjelmström, Anders Johannesson
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Publication number: 20140092277Abstract: An image acquisition device and a method for capturing image data is disclosed. The method comprises exposing an image sensor to light from a scene, selecting substantially all rows of sensor pixels in an image sensor in a substantially random order, starting an exposure period for each row of sensor pixels in the image sensor in the order the rows were selected, buffering the rows of sensor pixels comprised in an image frame until all rows of the image frame have registered image data for the presently captured image frame, and outputting image data representing the image frame by outputting image data from each row of sensor pixels.Type: ApplicationFiled: September 26, 2013Publication date: April 3, 2014Applicant: AXIS ABInventors: Per KANNERMARK, Anders JOHANNESSON
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Publication number: 20130021617Abstract: A method for determining a tilt of an image sensor surface plane in a camera in relation to a lens reference plane of the camera includes sending light onto the image sensor, receiving light reflected from the image sensor, identifying an interference pattern in the reflected light, identifying a feature of the interference pattern, and determining the tilt of the image sensor surface plane based on a position of the feature identified in the interference pattern.Type: ApplicationFiled: July 19, 2012Publication date: January 24, 2013Applicant: AXIS ABInventors: Jonas Hjelmström, Anders Johannesson
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Patent number: 7692700Abstract: A method used for the compensation of vignetting in digital cameras has been achieved. The compensation for vignetting is done in two steps. The first step is done during production of the camera unit and involves taking and analyzing an image of a test screen, preferably a gray test screen. This results in a set of e.g. 5×5 coefficients describing a polynomial surface. The second step is done for each image that is taken by the camera and involves calculating and applying a gain-table based on polynomial coefficients to all pixels of the image to compensate vignetting.Type: GrantFiled: March 4, 2003Date of Patent: April 6, 2010Assignee: Digital Imaging Systems GmbHInventors: Anders Johannesson, Ingemar Larsson
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Publication number: 20080165262Abstract: A method for reducing smear effect in an image sensor is presented. Firstly, a first charge level value from a first set of covered elements and a second charge level value from a second set of covered elements are received. Secondly, the first and the second charge level values are compared. Thirdly, if a difference resulting from said comparing said first and said second charge level values is outside a predetermined interval, camera settings are adjusted.Type: ApplicationFiled: November 8, 2007Publication date: July 10, 2008Applicant: AXIS ABInventors: Per Kannermark, Anders Johannesson, Daniel Anderberg
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Patent number: 7224833Abstract: A method for a fast color saturation control of digital color images using one color saturation factor has been achieved. Said method can be performed in any color space having three primaries as e.g. the R-G-B or in the CMY color space without the requirement to convert all the pixels of said color image into another color space as e.g. HSI to perform the color saturation control. Thus a significant computational effort for the conversion of the pixels from one color space into another and back can be avoided. Saving computational effort saves time and reduces the electrical power consumption. Right after the color saturation control process the corrected images can be viewed, if the colors are not satisfactory the process can be easily repeated using a modified color saturation factor. Said method can be used for new pictures taken by a digital camera as well as for downloaded pictures from any source. Additionally said method of color saturation control can be combined with a color correction process.Type: GrantFiled: October 15, 2002Date of Patent: May 29, 2007Assignee: Dialog Imaging Systems GmbHInventors: Anders Johannesson, Ingemar Larsson
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Patent number: 7158170Abstract: A test system and a related method to perform optical and electrical tests, to adjust the focus and to seal the lens of digital fixed-focus cameras have been achieved. Said test system is especially suited for miniature camera module to be built into consumer electronic devices as mobile phones, PDAs, etc. Said test system comprises three parts, a control system, an auto-focus head, and a XYZ robot. Said auto-focus head executes the adjustment of the focus, identifies hot pixels and black level, tests the saturation level, identifies cold pixels, tests dust particles and white, blue, red, and infrared color levels. As last step the auto-focus applies glue to fix the focused lens of the camera module. Said XYZ robot performs is moving the camera modules to be tested in XY direction and is approaching the lens system of the auto-focus head in Z direction. Said control system has interfaces to both, XYZ robot and auto-focus hand and is comprising interfaces and a frame grabber.Type: GrantFiled: May 8, 2003Date of Patent: January 2, 2007Assignee: Dialog Imaging Systems GmbHInventors: Lars Gustavsson, Anders Johannesson, Henrik Telander
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Patent number: 7146040Abstract: A method and a system for an automatic white balancing of color images being exposed to different illuminants have been achieved. The color information from the sensor color channels is measured and averaged over all pixels belonging to each of the colors of the color array used. The result is equivalent to what color a 1-pixel camera would see if pointed to the same scene. From this “statistical pixel” the ratios of the colors involved are calculated. Pictures taken in different illuminants as e.g. daylight, fluorescent light or incandescent light can then be separated due to their location in different categories in a space defined by said ratios of the colors involved. Each category has predefined white balance factors, which are applied to the image now.Type: GrantFiled: October 21, 2002Date of Patent: December 5, 2006Assignee: Dialog Imaging Systems GmbHInventors: Anders Johannesson, Ingemar Larsson
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Publication number: 20050018908Abstract: A method for compressing a digital image composed of a matrix of pixels to provide a compressed digital representation of said image of a predetermined size, the quality of the compressed digital representation being affected by a compression quality factor Q and the method including the fol-lowing steps: for a particular image producing device, developing a mathematical model defining a relationship between the content of the digital image and Q, developing said mathematical model by repeatedly compressing a set of digital test images with varying Q until each test image is compressed to a predetermined size, determining a metric M representing the content of the digital image, applying said metric M in said mathematical model to obtain an image determined quality factor Qmod and compressing the digital image using said quality factor Qmod.Type: ApplicationFiled: November 6, 2002Publication date: January 27, 2005Inventors: Anders Johannesson, Ingemar Larsson
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Publication number: 20040189812Abstract: A test system and a related method to perform optical and electrical tests, to adjust the focus and to seal the lens of digital fixed-focus cameras have been achieved. Said test system is especially suited for miniature camera module to be built into consumer electronic devices as mobile phones, PDAs, etc. Said test system comprises three parts, a control system, an auto-focus head, and a XYZ robot. Said auto-focus head executes the adjustment of the focus, identifies hot pixels and black level, tests the saturation level, identifies cold pixels, tests dust particles and white, blue, red, and infrared color levels. As last step the auto-focus applies glue to fix the focused lens of the camera module. Said XYZ robot performs is moving the camera modules to be tested in XY direction and is approaching the lens system of the auto-focus head in Z direction. Said control system has interfaces to both, XYZ robot and auto-focus hand and is comprising interfaces and a frame grabber.Type: ApplicationFiled: May 8, 2003Publication date: September 30, 2004Applicant: Dialog Semiconductor GmbhInventors: Lars Gustavsson, Anders Johannesson, Henrik Telander
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Publication number: 20040155970Abstract: A method used for the compensation of vignetting in digital cameras has been achieved. The compensation for vignetting is done in two steps. The first step is done during production of the camera unit and involves taking and analyzing an image of a test screen, preferably a gray test screen. This results in a set of e.g. 5×5 coefficients describing a polynomial surface. The second step is done for each image that is taken by the camera and involves calculating and applying a gain-table based on polynomial coefficients to all pixels of the image to compensate vignetting.Type: ApplicationFiled: March 4, 2003Publication date: August 12, 2004Applicant: Dialog Semiconductor GmbHInventors: Anders Johannesson, Ingemar Larsson
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Publication number: 20040057060Abstract: A method for a fast color saturation control of digital color images using one color saturation factor has been achieved. Said method can be performed in any color space having three primaries as e.g. the R-G-B or in the CMY color space without the requirement to convert all the pixels of said color image into another color space as e.g. HSI to perform the color saturation control. Thus a significant computational effort for the conversion of the pixels from one color space into another and back can be avoided. Saving computational effort saves time and reduces the electrical power consumption. Right after the color saturation control process the corrected images can be viewed, if the colors are not satisfactory the process can be easily repeated using a modified color saturation factor. Said method can be used for new pictures taken by a digital camera as well as for downloaded pictures from any source. Additionally said method of color saturation control can be combined with a color correction process.Type: ApplicationFiled: October 15, 2002Publication date: March 25, 2004Applicant: Dialog Semiconductor GmbH.Inventors: Anders Johannesson, Ingemar Larsson
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Publication number: 20040057615Abstract: A method and a system for an automatic white balancing of color images being exposed to different illuminants have been achieved. The color information from the sensor color channels is measured and averaged over all pixels belonging to each of the colors of the color array used. The result is equivalent to what color a 1-pixel camera would see if pointed to the same scene. From this “statistical pixel” the ratios of the colors involved are calculated. Pictures taken in different illuminants as e.g. daylight, fluorescent light or incandescent light can then be separated due to their location in different categories in a space defined by said ratios of the colors involved. Each category has predefined white balance factors, which are applied to the image now.Type: ApplicationFiled: October 21, 2002Publication date: March 25, 2004Applicant: Dialong Semiconductor GmbH.Inventors: Anders Johannesson, Ingemar Larsson