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A Tone Mapping Method Based on Number Density Equalization

A tone mapping and number density technology, applied in color TV, color TV parts, TV system parts and other directions, can solve problems such as narrow application range, low efficiency, and complex calculation of local algorithms, and can adapt to a wide range of scenarios. , the effect of small calculation amount and fast calculation speed

Active Publication Date: 2019-06-18
宁波星帆信息科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The local algorithm has complex calculations, low efficiency, and narrow application range

Method used

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  • A Tone Mapping Method Based on Number Density Equalization
  • A Tone Mapping Method Based on Number Density Equalization
  • A Tone Mapping Method Based on Number Density Equalization

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Embodiment Construction

[0016] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0017] figure 1 is the algorithm flowchart of the tone mapping method based on number density equalization in the present invention, refer to figure 1 , the method includes the steps of:

[0018] Step 100, first obtain a high dynamic range (HDR) image.

[0019] The image can be obtained directly from a digital device (camera, video camera, etc.) or synthesized through a certain algorithm. For color images, you can convert them to black and white first. Use I to represent a high dynamic image, and its brightness range is [0, HB max ], HB max It is the maximum brightness value of the high dynamic image.

[0020] Step 200, counting the total number of pixels of each brightness level to obtain the "brightness-number den...

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PUM

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Abstract

The invention discloses a tone mapping method based on number density equalization. The method comprises the steps of: obtaining a high dynamic image; dividing the brightness range of the high dynamic image into a plurality of brightness levels; when the high dynamic image is When the scene image is darker, the brightness range of the high dynamic image is divided into a first brightness range and a second brightness range, the first brightness range is mapped to the first brightness range of the low dynamic image, and the second brightness range is mapped to the first brightness range of the low dynamic image. The brightness range is mapped to the second brightness range of the low dynamic image; when the high dynamic image is a non-dark scene image, the brightness range of the high dynamic image is mapped to the brightness range of the low dynamic image. The method of the invention has fast calculation speed, simple implementation and wide adaptability to scenarios.

Description

technical field [0001] The invention relates to the field of image and video data processing, in particular to a tone mapping method based on number density equalization. Background technique [0002] High dynamic range images can reveal details of extremely dark and extremely bright areas that may be lost by traditional low dynamic images, but can be perceived by the human visual system. It correctly represents real-world brightness ranges. However, the dynamic range of traditional image sensors is generally only 102 orders of magnitude. Therefore, due to the limitation of display devices, high dynamic images cannot be displayed on conventional devices, so it is very meaningful to perform tone mapping on high dynamic images. [0003] Tone mapping compresses the brightness of high dynamic images to the acceptable range of traditional display devices, while retaining the details of the original image as much as possible, and finally achieves the effect that the image display...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235
CPCH04N23/73H04N23/741
Inventor 周建锋汪佳丽
Owner 宁波星帆信息科技有限公司