No-reference tone mapping image quality evaluation method based on multi-feature fusion

Abstract

The invention provides a non-reference tone mapping image quality evaluation method based on multi-feature fusion. The method mainly comprises a feature extraction stage and a training regression stage. In the feature extraction stage, features of an image are extracted in three fields, and entropy features of the image, texture features based on a gray level co-occurrence matrix and natural scenestatistical features are extracted in the pixel field. In the field of ambiguity, local phase consistency is adopted to evaluate the overall ambiguity, and small block features are extracted from anedge region to measure the halo effect. In the color field, an image is converted into an opposite color space, and overall color information and contrast information of all channels are measured. Finally, the quality of the tone mapping image is predicted by using a machine learning method. The algorithm provided by the invention can accurately and effectively predict the quality of the tone mapping image.

Description

technical field [0001] The present invention relates to the technical field of tone mapping image quality evaluation, and is an image quality evaluation method based on feature extraction, in particular, it relates to a non-reference tone mapping image quality evaluation method based on multi-feature fusion. Background technique [0002] High Dynamic Range (HDR) images can accurately show the difference in brightness from gloomy starlight to bright sunlight (10 -3 cd / m 2 to 10 5 cd / m 2 ), which can bring viewers a more realistic and rich visual experience. However, existing image processing systems mainly use traditional 8-bit low dynamic range (Low Dynamic Range, LDR) display devices. In order to make the HDR image backward compatible with the LDR display device, a tone-mapping operator (Tone-Mapping Operator, TMO) for converting the HDR image into the LDR image is proposed. Ideally, the tone-mapped image (Tone-Mapped Image, TMI) should retain the original structure an...

AI Technical Summary

Problems solved by technology

[0004] 1. The current algorithm only considers certain single-category features and does not start from multiple perspectives, so the prediction accuracy is poor;

[0005] 2. The current algorithm only evaluates image quality from the perspective of the human visual system, and does not take into account the unique characteristics of TMI images, such as the unique halo effect of TMI images

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