Adaptive histogram equalization of wavelet sub bands for the enhancement of contrast in aerial images

Nagamani, K.; Divya, K.; Sujatha, K.; Bonagiri, Koteswar Rao; Kande, Giri Babu; Kumar, Parveen

doi:10.1016/j.matpr.2021.10.297

Cited by 2 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, since histogram equalization significantly changes the contrast of the image, it is easy to cause the loss of detail information [ 105 ]. In view of this situation, scholars at home and abroad have proposed many improved algorithms, such as adaptive histogram equalization [ 106 , 107 , 108 ] and unsharp mask method [ 109 ], which retain the details of the image and improve the effect of image enhancement. By enhancing the infrared thermal image, it is more advantageous to extract the feature parameters in the next step.…”

Section: The Flow Of Fault Diagnosis Methods For Rotating Machinery U...mentioning

confidence: 99%

A Review of Fault Diagnosis Methods for Rotating Machinery Using Infrared Thermography

Wang¹,

Zhan²,

Bai³

et al. 2022

Micromachines

View full text Add to dashboard Cite

At present, rotating machinery is widely used in all walks of life and has become the key equipment in many production processes. It is of great significance to strengthen the condition monitoring of rotating machinery, timely diagnose and eliminate faults to ensure the safe and efficient operation of rotating machinery and improve the economic benefits of enterprises. When the state of a rotating machine deteriorates, the thermal energy that is much more than its normal operation will be generated due to the increase in the friction between the components or other factors. Therefore, using the infrared thermal camera to collect the infrared thermal images of rotating machinery and judge the health status of rotating machinery by observing the temperature distribution in the thermal images is often more rapid and effective than other technologies. Nevertheless, after decades of development, the research achievements of infrared thermography (IRT) and its application in various industrial fields are numerous and complex, and there is a lack of systematic sorting and summary of the achievements in this field. Accordingly, this paper summarizes the development and application of IRT as a non-contact and non-invasive tool for equipment condition monitoring and fault diagnosis, and introduces the basic theory of IRT, image processing technology and fault diagnosis methods of rotating machinery in detail. Finally, the review is summarized and some future potential topics are proposed, which will make the subject easier for beginners and non-experts to understand.

show abstract

Section: The Flow Of Fault Diagnosis Methods For Rotating Machinery U...mentioning

confidence: 99%

A Review of Fault Diagnosis Methods for Rotating Machinery Using Infrared Thermography

Wang¹,

Zhan²,

Bai³

et al. 2022

Micromachines

View full text Add to dashboard Cite

show abstract

“…f (i, j ) is the pixel value of F (x, y) at the point (i, j ), f (x, y) is the pixel value of F (x, y) at centre point (x, y). As can be seen from Equation (9), the larger the distance between pixels, the smaller d (i, j ) is, and the more significant the difference of the pixels in the image, the smaller r (i, j ) is. Hence, BF can not only smooth the filtered image but preserve the details of the image.…”

Section: Bilateral Filtermentioning

confidence: 99%

“…That is to say, image enhancement is an effective way to recover the quality of degraded images. Therefore, plenty of image enhancement approaches including histogram equalization [7][8][9], transformation domain-based [5,10,11], Retinex-based [12] and learning-based methods [13,14] have been put forward.…”

Section: Introductionmentioning

confidence: 99%

“…Histogram-based methods involve global histogram equalization (GHE) [9,15,16] and local histogram equalization (LHE) [8,17,18]. GHE stretches the image pixels in the global range via the identical transfer function.…”

Section: Introductionmentioning

confidence: 99%

“…Whereas, they encounter high complexity and introduce blocking effects and unwanted noise. In [9,36], image segmentation, filter, image pyramid etc., first generate sub-images in different layers, and then different approaches process them based on their characteristics. Although they can yield images with abundant details, some enhanced results still encounter unsatisfactory brightness and colour.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Retinex‐inspired contrast stretch and detail boosting for lowlight image enhancement

Liu

Lan

et al. 2023

IET Image Processing

View full text Add to dashboard Cite

Lowlight images with low brightness and contrast, blurry details usually bring us an uncomfortable visual experience. To promote the quality of these deviation images, this paper presents a new and efficient approach, named MFMR, for enhancing lowlight images in the hue‐saturation‐value (HSV) colour space. Concretely, the multi‐angle filter is first applied to estimate the artifact‐free illumination and reflection component of the V‐channel. Afterward, the adaptive bi‐interval histogram with human visual characteristics and morphological operations is employed to process the former, adaptive gamma correction to process the latter for generating various feature maps. In the end, these feature maps are united via adaptive multi‐scale fusion strategy to reconstruct high‐quality images, which are characterized by high contrast and brightness, vivid colour, and clearer details. Extensive experiments show that this method is a well‐proven low‐light image enhancement approach, which outperforms the state‐of‐the‐art comparison methods. Furthermore, the proposed method also can yield satisfying images in the heavy foggy, yellow sand, underwater, and other severe conditions.

show abstract

Adaptive histogram equalization of wavelet sub bands for the enhancement of contrast in aerial images

Cited by 2 publications

References 9 publications

A Review of Fault Diagnosis Methods for Rotating Machinery Using Infrared Thermography

A Review of Fault Diagnosis Methods for Rotating Machinery Using Infrared Thermography

Retinex‐inspired contrast stretch and detail boosting for lowlight image enhancement

Contact Info

Product

Resources

About