High Dynamic Range Image Generation Method by Fusing Multi-Level Gamma-Transformed Images

Fig. 2. Partition process of image. (a) Original image; (b) histogram of luminance distribution in original image; (c) histogram of luminance accumulated probability; (d) partition result of luminance grade in original image

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Fig. 3. Generation process of HDR image from LDR image of Wreath Building. (a) Original image; (b) partition result of luminance grade in original image; (c) Gamma transform result with γ1=0.7494; (d) Gamma transform result with γ2=1.0000; (e) Gamma transform result with γ3=1.8694; (f) Gamma transform result with γ4=3.1372; (g) HDR image fused by (c), (d), (e) and (f)

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Fig. 4. Comparison of HDR images generated by PMET and proposed method with original images. (a) Original images; (b) PMET method; (c) proposed method

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Table 1. Information entropy of HDR images generated by two methodsbit
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Table 1. Information entropy of HDR images generated by two methodsbit
Algorithm Wreath Office Morning Clock Display Church Fribourg
PMET method 3.0829 3.0234 2.3555 2.8909 2.5056 2.6300 3.2014
Proposed method 3.2478 3.0423 2.9112 3.0779 3.0378 3.0552 3.3582

Table 2. Average gradient of HDR images generated by two methods
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Table 2. Average gradient of HDR images generated by two methods
Algorithm Wreath Office Morning Clock Display Church Fribourg
PMET method 14.7208 10.7080 20.4957 9.1712 13.7810 7.1773 7.8528
Proposed method 15.1626 11.9420 21.5473 10.9574 14.4642 8.6197 8.1130

Table 3. Chromatic aberration of HDR images generated by two methods with original images
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Table 3. Chromatic aberration of HDR images generated by two methods with original images
Algorithm Wreath Office Morning Clock Display Church Fribourg
PMET method 35.2295 24.1876 20.8443 33.0815 28.4437 27.1942 26.7511
Proposed method 7.3468 9.3206 13.9504 10.1783 5.2490 3.7108 16.6267

Table 4. Time consumption to generate HDR images from seven test LDR images by two methodss
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Table 4. Time consumption to generate HDR images from seven test LDR images by two methodss
Algorithm Wreath Office Morning Clock Display Church Fribourg
PMET method 0.977 0.832 1.023 1.131 0.966 0.946 1.299
Proposed method 0.557 0.482 0.520 0.545 0.554 0.580 0.647

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Xiaonan Chen, Shufang Zhang, Zhichun Lei. High Dynamic Range Image Generation Method by Fusing Multi-Level Gamma-Transformed Images[J]. Laser & Optoelectronics Progress, 2018, 55(4): 041014

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Paper Information

Category: Image processing

Received: Sep. 29, 2017

Accepted: --

Published Online: Sep. 11, 2018

The Author Email: Zhang Shufang ( shufangzhang@tju.edu.cn)

DOI:10.3788/LOP55.041014

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Information entropy of HDR images generated by two methodsbit

Table 1. Information entropy of HDR images generated by two methodsbit

Table 2. Average gradient of HDR images generated by two methods

Table 2. Average gradient of HDR images generated by two methods

Table 3. Chromatic aberration of HDR images generated by two methods with original images

Table 3. Chromatic aberration of HDR images generated by two methods with original images

Table 4. Time consumption to generate HDR images from seven test LDR images by two methodss

Table 4. Time consumption to generate HDR images from seven test LDR images by two methodss