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A local image mapping method and a vehicle camera

A local image and mapping method technology, applied in the field of image processing, can solve problems such as loss of dynamic range, lack of exposure control, loss of contrast, etc., and achieve good results

Active Publication Date: 2020-11-13
HUIZHOU DESAY SV AUTOMOTIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Often there is a loss of contrast after adjustment, or a loss of dynamic range
Image issues ranging from annoying to poor exposure control
[0003] Unable to meet the image processing field of vehicle cameras, especially the ADAS system based on image processing, which has high requirements for exposure control and detail restoration

Method used

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  • A local image mapping method and a vehicle camera
  • A local image mapping method and a vehicle camera
  • A local image mapping method and a vehicle camera

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a local image mapping method, which can be used in many different image acquisition fields, and is especially suitable for use in image processing of a camera used in automobiles. Localized adjustment is performed on the collected image signal. After acquiring the source image, it copies the source image into two copies, one is used for preprocessing to generate a reference image, and the other is used for local adjustment, wherein the image adjustment parameters for local adjustment come from the reference image.

[0040] Such as figure 1 As shown, as a preprocessing step, it includes the following:

[0041] S1. First, obtain the source image through the ISP unit. The image format of the source image can include but not limited to YUV, L*a*b*, RGB, etc. It is understandable that according to different source image formats, you can choose a suitable filtering method filter the image,

[0042] Preferably, in order to improve the processing eff...

Embodiment 2

[0060]This implementation is further optimized on the basis of Example 1, such as image 3 As shown, in this embodiment, the brightness dynamic compensation method in step S3 is as follows:

[0061] S31. Calculate the average luminance value corresponding to the fuzzy reference image in the current area;

[0062] S32. Determine a dynamic compensation amount according to the average brightness value. The dynamic compensation amount may be a constant or a function, and is used to adjust brightness settings to be corrected in different scenes. Such as night, day or other special scenes such as dense fog and snow. The average brightness value is inversely correlated with the dynamic compensation amount. When the brightness is high, compensation may not be required, and when the brightness is low, appropriate compensation is performed. For convenience of description, use express.

[0063] S33. Use the dynamic compensation amount to dynamically compensate each pixel value in t...

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PUM

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Abstract

The invention relates to a partial image mapping method, which is characterized in that it comprises the following steps: acquiring a source image, performing filtering processing on the image, obtaining a blurred reference image and segmenting a partial image; constructing a compensation parameter to dynamically compensate the brightness of a pixel of the partial image ; The relationship between the input pixel value and the corresponding pixel value of the fuzzy reference image is mapped to the current pixel by constructing a mapping function to obtain an output parameter; the output parameter is used to adjust the input pixel value to complete the local mapping; wherein, the mapping function is a number order polynomial. At the same time, a vehicle camera adopting the above-mentioned mapping method is also disclosed. The image problem of poor exposure control of the image of the present invention ensures that the details of the image are not lost in extreme cases, and the image adjusted by the present invention has a better effect on visual recognition (such as ADAS systems), and can be used It is suitable for special scenes, and can be adjusted with different coefficients for different scenes.

Description

technical field [0001] The invention relates to image processing, in particular to a local image mapping method and a vehicle camera. Background technique [0002] Partial image mapping technology is an image processing technology that adjusts regional contrast. The processed image has better performance in terms of vision or image discrimination, but the current partial image mapping algorithm is not particularly suitable for extremely bright or dark processing. Usually there is a loss of contrast after adjustment, or a loss of dynamic range. From annoying image problems resulting in poor exposure control. [0003] It cannot meet the image processing field of the vehicle camera, especially the ADAS system based on image processing, which requires high exposure control and detail restoration. Contents of the invention [0004] In order to solve the above technical problems, the present invention provides a local image mapping method. [0005] A local image mapping meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235
CPCH04N23/741
Inventor 陈昱翰尤泽荣
Owner HUIZHOU DESAY SV AUTOMOTIVE