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Digital camera parameter varying tristimulus values acquisition method based on homogeneous polynomiald

A tri-stimulus value, digital camera technology, applied in the field of training and actual measurement, can solve the problem of fixed camera parameters, and achieve the effect of increasing the degree of freedom, fast computing speed, improving adaptability and practicability

Inactive Publication Date: 2016-07-06
ZHEJIANG UNIV
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Problems solved by technology

[0005] In order to overcome the defect that the camera parameters must be fixed during training and actual measurement in the existing camera color measurement methods, the present invention provides a method for obtaining tristimulus values ​​based on variable homogeneous polynomial digital camera parameters

Method used

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  • Digital camera parameter varying tristimulus values acquisition method based on homogeneous polynomiald
  • Digital camera parameter varying tristimulus values acquisition method based on homogeneous polynomiald
  • Digital camera parameter varying tristimulus values acquisition method based on homogeneous polynomiald

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Embodiment Construction

[0027] Taking Nikon digital SLR camera D3x with Nikon AF-S NIKKOR 24-120mmf / 4GEDVR lens as an example, the method of using this digital camera to obtain the tristimulus value of object color by imaging is explained. It should be noted that the present invention is not limited to Nikon digital SLR cameras, and any digital camera that can obtain a Raw file format is applicable to the present invention.

[0028] Such as figure 1 As shown, the present invention is a method for obtaining tristimulus values ​​based on a homogeneous polynomial digital camera with variable parameters, which specifically includes the following steps:

[0029] (1) Carry out characterization training to the digital camera: Obtain the RGB value after the uniformity correction of the training sample and the CIE tristimulus value XYZ, and the transformation coefficient matrix M, and record the camera shooting parameters during training; specifically include the following sub-steps:

[0030] (1.1) Take trai...

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Abstract

The invention discloses a digital camera parameter varying tristimulus values acquisition method based on homogeneous polynomiald. In the method, a digital camera shooting parameter is introduced as an input variable, camera response value association of different parameter settings of a measured sample and a training sample is built, and based on a first-order homogeneous polynomial model, equivalent RGB values are converted into XYZ tristimulus values of the measured sample. The method provided by the invention overcomes the defect that the camera is required to necessarily fix the shooting parameter for training and actual measurement in the conventional method, thus, the digital camera can be trained with one fixed shooting parameter, and can freely change the shooting parameter in actual shooting measurement, therefore, convenience for the digital camera to be an imaging type colourimetry instrument is provided.

Description

technical field [0001] The invention relates to a method for obtaining color tristimulus values ​​based on digital camera imaging in a color management system, especially a method for training and actual measurement under the condition that the setting parameters of the digital camera change. Background technique [0002] At present, compared with traditional color measurement equipment, using a commercial digital camera as an imaging color measurement instrument has the advantages of low cost and easy operation, so it has been more and more used in the field of quantitatively capturing scene chromaticity information . However, the RGB space of the camera is a device-dependent space. Using different cameras in the same scene will result in different RGB values. Therefore, it is necessary to establish a mapping relationship between the camera RGB color space and the CIEXYZ standard color space, which is the chromaticity characterization of the camera. . In order to ensure t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N17/00
CPCH04N17/002
Inventor 徐海松吴晓玟汪哲弘方竞宇
Owner ZHEJIANG UNIV
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