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Motor vehicle camera device with histogram spreading

A motor vehicle, histogram technology, applied to vehicle components, optical observation devices, image enhancement, etc., to achieve the effect of masking or reducing sensor noise

Active Publication Date: 2017-08-18
CONNAUGHT ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Here, the method can be performed separately for each original image

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  • Motor vehicle camera device with histogram spreading
  • Motor vehicle camera device with histogram spreading
  • Motor vehicle camera device with histogram spreading

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Embodiment Construction

[0033]The embodiments described below are preferred embodiments of the present invention. However, in this embodiment, each component of the described embodiment represents each feature of the invention considered independently of each other, each independently develops the invention, and is therefore also considered to be in a separate manner or as shown. Components of the invention other than combinations. Furthermore, the described embodiments can also be supplemented by further features of the invention which have already been described.

[0034] exist figure 1 In , the histogram expansion known in the prior art is shown. An input histogram Hi is shown, ie a histogram that may be formed from the pixel values ​​of the pixels of the raw image of the camera sensor. In the example shown, as well as in further examples, it is assumed that each pixel can have a pixel value that can range from 0 to 255, ie an 8-bit pixel value. A pixel value may eg be a luminance value Li or ...

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Abstract

The invention relates to methods for operating a camera device (4) for a motor vehicle (3). An image sensor (5) of the camera device (4) provides a raw image (R) of an environment (8) of the camera device (4). An image processing device (6) generates an output image (I) from the raw image (R) by means of a spreading function (13) of a histogram spreading (12). The spreading function (13) generates from a respective input pixel value (Li) of each pixel of the raw image (R) each one output pixel value (Lo) of a corresponding pixel of the output image (I). It is the object of the invention to adapt the histogram spreading (12) to the capturing situation. At least one parameter value (S, G) of the camera device (4) depending on a brightness (B1, B2) of the environment (8) is acquired and a limit value (L) for the output pixel values (Lo) is set in the spreading function (13) depending on the at least one acquired parameter value (S, G).

Description

technical field [0001] The invention relates to a method of operating a motor vehicle camera arrangement. A raw image of the environment of the camera device is provided by an image sensor of the camera device. An output image is generated from the original image based on the histogram expansion by image processing means. The invention also relates to a camera arrangement for carrying out the method and to a motor vehicle having the camera arrangement. Background technique [0002] In generating a raw image by an image sensor, the raw image may have an undesirably low dynamic range. If the original image for example has pixels each of which is represented by an 8-bit color value or an 8-bit photometric or luminance value, so each pixel of each color or luminance can actually have a total of 256 different values, For example pixel values ​​from 0 to 255. In the raw image of the image sensor, there are accordingly the darkest pixel with the smallest pixel value and the bri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235
CPCH04N23/70H04N23/10H04N23/57H04N23/71H04N23/73H04N23/75H04N23/76H04N23/88G06T5/92G06T5/40
Inventor M.P.格里芬
Owner CONNAUGHT ELECTRONICS