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Black level drift

A technology of black level and deviation, applied in TV, electrical components, color TV, etc., can solve the problems of expensive, difficult and complicated black level deviation of image sensor

Pending Publication Date: 2021-12-07
AXIS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, determining image sensor black level offset can be difficult, complex and / or expensive and thus remains a challenge

Method used

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Embodiment Construction

[0020] Non-limiting embodiments of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which presently preferred embodiments of the disclosure are shown. However, this disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Like reference symbols designate like elements throughout. Dotted lines in some blocks in the figures indicate that these units or actions are optional rather than mandatory.

[0021] In the following, a method will be disclosed according to an embodiment herein related to black level offset evaluation of a digital camera image sensor, according to which the offset from the true black level in the setup of a digital camera image sensor can be determined.

[0022] Referring now to the attached drawings, especially figure 1 , depicts a schematic diagram of exemplary chromaticity as a function of luminance as determined by an...

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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.

Description

technical field [0001] The present disclosure relates to black level shift evaluation of digital video camera image sensors. Background technique [0002] With the use of digital cameras (e.g. video cameras), it may be possible (e.g. for surveillance purposes) to capture images in a particular environment (e.g. office, industrial site, part of a city, open squares, city blocks, roads, etc.) Images of the surrounding environment (ie, scene) can help provide insight and information about the scene, which can be revealing and / or interesting in one way or another. [0003] A recurring problem associated with image processing of captured images is related to black level shift, i.e., the black level setting of the digital video camera image sensor with which the image can be captured is erroneous (i.e. offset from the true black level). This shift may, for example, occur over time, related to temperature changes, and / or due to changes in the characteristics and / or tolerances of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/361H04N5/217H04N23/12
CPCH04N23/84H04N1/407H04N17/002H04N5/165H04N5/57H04N9/64H04N25/63
Inventor J·杰普森卡林J·乔恩松
Owner AXIS