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Method for automatically evaluating portrait lighting artistry

An evaluation method and artistic technology, applied in the field of computer vision, which can solve problems such as limiting the performance of computer aesthetic evaluation

Active Publication Date: 2013-12-25
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early work, researchers only used global visual features, and then Datta et al. from Pennsylvania State University began to consider local features in image regions. The visual feature design of specific image subject content (such as portraits, landscapes, etc.), because the visual features vary greatly between different subject works, which largely limits the performance of computer aesthetic evaluation

Method used

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  • Method for automatically evaluating portrait lighting artistry
  • Method for automatically evaluating portrait lighting artistry
  • Method for automatically evaluating portrait lighting artistry

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Embodiment Construction

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] refer to figure 1 , the present invention at first utilizes facial feature point positioning method (ASM: Active Shape Model) to locate 90 feature points on the human face, including the outer contours of the face, eyebrows, eyes, nose and lips, see figure 2 According to the identified 90 feature points, 16 rectangular areas are defined, covering key areas of the face, such as forehead, eyebrows, eyes, cheeks, nose, lips, chin, etc.

[0043] refer to image 3 , the present invention takes the portrait face as an example to design light and shadow features, and uses local light and shadow contrast features. Each feature F includes four parts:

[0044] 1) Contrast type T, including "left-right", "up-down", "inside-outside";

[0045] 2) Contrast area R, according to the contrast type T, the contrast area R is divided into two ...

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Abstract

The invention provides a method for automatically evaluating portrait lighting artistry, which is characterized by extracting an artistic portrait lighting template from an artistic and living portrait photograph data set and using the template to realize the qualitative evaluation and quantitative evaluation of the portrait lighting artistry. The method comprises the following steps: firstly, extracting an initial partial lighting comparison characteristic set; then, selecting characteristics having higher discrimination based on a gradual characteristic selection algorithm to form the artistic portrait lighting template; finally, using the template to realize the classification of artistic and living portraits through a probability ratio test; and regressing the lighting artistry scoring of users on part of the portrait photographs to realize the evaluation of the portrait lighting artistry. Thus, the constructed artistic portrait lighting template conforms to an artistic lighting mode in professional artistic photography, high classification accuracy of the artistic and living portraits can be obtained, and the evaluation of the portrait lighting artistry can be numerically scored in a reasonable manner. The method provided by the invention can be widely used and popularized in the fields of interactive digital entertainment, movie and video programming and the like.

Description

technical field [0001] The invention belongs to the field of computer vision, in particular to an image understanding method, in particular to an automatic evaluation method for portrait lighting artistry. Background technique [0002] Computer vision is to use various imaging systems instead of visual organs as input sensitive means, and the computer replaces the brain to complete processing and interpretation. The ultimate research goal of computer vision is to enable computers to observe and understand the world through vision like humans, and have the ability to adapt to the environment autonomously. [0003] The purpose of the present invention is to make use of computer vision technology to enable computers to recognize the lighting of works of art like human artists. Taking portrait lighting as an example, a computer is used to construct a portrait art light and shadow template to achieve a qualitative evaluation of portrait lighting artistry (art and life). Classifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
Inventor 陈小武赵沁平金鑫吴洪宇
Owner BEIHANG UNIV
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