Displaying and detail enhancing method of high dynamic range infrared image

A high dynamic range, infrared image technology, applied in computational photography, image processing, and infrared fields, can solve the problem of missing details and achieve the effect of improving detailed information

Active Publication Date: 2018-05-29
NANJING UNIV
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AI Technical Summary

Problems solved by technology

Multi-scale layering algorithms mainly include mapping algorithms based on Laplacian pyramid and mapping algorithms based on wavelet transform. Laplacian pyramid algorithm works well when dealing with visible light high dynamic range images, but when dealing with high dynamic infrared images , some details will be lost

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  • Displaying and detail enhancing method of high dynamic range infrared image
  • Displaying and detail enhancing method of high dynamic range infrared image
  • Displaying and detail enhancing method of high dynamic range infrared image

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] refer to figure 1 with figure 2 In this embodiment, a high dynamic range infrared image display and detail enhancement method based on base-level-detail layered processing and fusion first adopts the Laplacian pyramid algorithm to compress and obtain the dynamic range of the high dynamic infrared image. A base layer of inter-regional contrast, then amplified image gradients to enhance detail textures through nonlinear mapping, and finally reconstructed and fused through image optimization to obtain the final image with enhanced details. Specific steps are as follows:

[0018] Step 1, image preprocessing: Infrared scenes are mainly in the form of low contrast and small-scale gray value aggregation. In order to obtain better enhancement effects, before performing dynamic compression and detail enhancement of high-dynamic infrared imag...

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Abstract

The invention discloses a displaying and detail enhancing method of a high dynamic range infrared image. The displaying and detail enhancing method of the high dynamic range infrared image includes the following specific steps that 1, the high dynamic range infrared image is preprocessed, and self-adaptive linear stretch is conducted on the gray scale range of the infrared image; 2, a Laplace filter is adopted to compress the dynamic range of the high dynamic range infrared image to a displayable low dynamic range infrared image, and at the same time, image local contrast is maintained; 3, regarding detail components in the high dynamic range infrared image, gradient information extraction is conducted on the originally input high dynamic range infrared image, and non-linear enhancement iscarried out; 4, finally, the low dynamic range infrared image and enhanced gradient information are optimized, fused and rebuilt to obtain an infrared image with detail enhancement. By the adoption of the displaying and detail enhancing method of the high dynamic range infrared image, the overall contrast of the high dynamic range infrared image is effectively improved, detail information of thehigh dynamic range infrared image is maintained, and the displaying and detail enhancing method of the high dynamic range infrared image can be effectively applied to the aspects of detection, reconnoitering, monitoring, navigation and the like of infrared thermography technologies.

Description

technical field [0001] The invention relates to the field of computational photography and image processing, in particular to the field of infrared technology of dynamic range compression and detail enhancement of high dynamic range infrared images. Background technique [0002] Infrared imaging technology has a wide range of applications in detection, reconnaissance, monitoring and navigation. Infrared imaging systems are generally used in scenes with large temperature changes, but the temperature difference between the target and the background or the local target is relatively small, such as the ground (sea) surface and the sky, local high temperature or flame targets, etc. Therefore, the infrared imaging system not only needs to have high spatial and temperature resolution, but also has a large signal dynamic range (HDR). [0003] The original image data (14-16bits) obtained by the high dynamic range infrared sensor far exceeds that of the existing display device (usual...

Claims

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Application Information

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IPC IPC(8): G06T5/40
CPCG06T5/40G06T2207/20208G06T2207/10048G06T2207/20004
Inventor 岳涛王伟朱曦李斌
Owner NANJING UNIV
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