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Method for correcting colors of projector

A technology for color correction and projectors, which is applied to instruments, color TVs, components of color TVs, etc. It can solve the problems of complex operation, difficult application and high cost, and achieve the effect of simple operation, reduction of color differences, and easy implementation.

Inactive Publication Date: 2011-09-21
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

The disadvantage of these two methods is that they rely on expensive professional optical equipment, complicated operation and high cost
Raij A et al. used HDR technology to sample the output luminance when the RGB value of the projector increases, and obtained some HDR images, and then obtained the approximate ITF curve of the projector. The disadvantage is that a large number of sampled images are required. In practice Difficult to apply

Method used

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  • Method for correcting colors of projector
  • Method for correcting colors of projector
  • Method for correcting colors of projector

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Embodiment Construction

[0032] Step 1: the inventive method (100) part, obtains ITF curve, concrete steps are as follows:

[0033] Step 110: start;

[0034] Step 120: the computer (6) reads the calibration image (8);

[0035] Step 121: the computer (6) calculates the image coordinates (abscissa and ordinate) of each sampling point in the calibration image (8) (the number of sampling points depends on the color progression of the calibration image (8), ranging from 1 to 256);

[0036] Step 122: the computer (6) extracts its color value to be cast according to the image coordinates of each sampling point;

[0037] Step 130: The computer (6) projects the calibration image (8) onto the projection screen (2) for display through the projector (7), and obtains a projected display image;

[0038] Step 131: The light meter (1) faces the projector (7) in front of the projection screen (2), and the light meter (1) measures the ambient light; combine the exposure time read by the light meter (1) with the apert...

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Abstract

The invention provides a method for correcting colors of a projector, comprising the following steps: using a light meter to adjust parameters such as aperture, exposure time and the like of a camera; comparing the projected image obtained by the camera with an original image, using a nonlinear optimization method to fit a luminosity response curve; using the luminosity response curve to correct the original image to obtain a high-quality projected image suitable for human eyes. The method has advantages that a method of computer software is used, the problem of the color difference in a single-projection display system or a multi-projection display system is solved, the quality of pictures and the visual effect are improved, expensive and complicated special optical apparatuses are not needed, at the same time, the number of the photos needed in a HDR method is greatly reduced (the HDR method needs to shoot ten images, the method of the invention needs one image); and the method has simple operation, easy practicality and strong extensibility.

Description

technical field [0001] The invention relates to a convenient and fast color correction method for projectors, which is widely applicable to the fields of virtual reality, military simulation, video conferencing, industrial design and other fields related to display technology, such as various projectors, and solves the problems of nonlinear response of the brightness of the projector itself, Problems such as changes in output color with time of use, color differences between multiple projectors, etc., realize low-cost, easy-to-implement, and easy-to-operate projector color correction. Background technique [0002] With the rapid development of virtual reality technology, people pay more and more attention to visual display. Perceptual and psychological studies have shown that people can easily perceive a 2% difference in brightness and a color difference brought about by a 2nm light wavelength change. However, for projection display technology, as the projector's use time i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/74G03B21/00
Inventor 丁莹范静涛杨华民韩成陈纯毅李岩芳
Owner CHANGCHUN UNIV OF SCI & TECH
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