Image projection apparatus, control method, control program, and storage medium

Abstract

An image projection apparatus includes a light source; a projected image outputting unit having multiple mirrors arranged in a matrix, to which radiating light emitted from the light source while controlling an angle of a light reflection face of each of the mirrors; a control unit controls the angle of light reflection face of the mirrors using the a division half-toning control based on image data of a projected image, and settings of control parameters used for the time division half-toning control; and an image capturing device to capture the projected mage. When the control unit detects a false contour in a projected test pattern image based on image data of the projected test pattern image captured by the image capturing device, the control unit corrects the control parameters for the time division half-toning control based on detection of the false contour.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority pursuant to 35 U.S.C. §119 to Japanese Patent Application No. 2012-112592, filed on May 16, 2012 in the Japan Patent Office, the disclosure of which is incorporated by reference herein in its entirety.BACKGROUND[0002]1. Technical Field[0003]The present invention relates to an image projection apparatus for projecting images, a control method, a control program, and a storage medium storing the program.[0004]2. Background Art[0005]Image projection apparatuses known as projectors may employ a digital light processing (DLP: registered trademark) projector. The DLP projector employs a semiconductor device, called the digital micro-mirror device (DMD: registered trademark). having a large numbers of micro mirrors arranged in a matrix and used as light reflection faces whose tilt can be controlled within a given range of angles. As the light coming from a light source strikes the light reflection face of each of ...

AI Technical Summary

Benefits of technology

[0015]In another aspect of the present invention, a method of projecting an image using an image projection apparatus having a light source and multiple mirrors arranged in a matrix pattern, to which radiating light emitted from the light source while controlling an angle of a light reflection face of each of the mirrors is devised. The method includes the steps of projecting a test pattern image for image adjustment; capturing a projected image of the test pattern image; detecting a false contour in the test pattern image based on image data of the captured test pattern image; controlling the angle of light reflection face of each of the mirrors using a time division half-toning control based on image data of an projected test pattern image and a value of control parameter used for the time division half-toning control; and correcting the value of control parameter used for the time division half-toning control upon detecting the false contour to suppress occurrence of the false contour.

Problems solved by technology

A problem with DLP projectors is that each DLP projector may have slightly different color reproduction properties (hereinafter, color properties) from any other.

Thus, the same image signal may not be projected with the desired image quality.

Therefore, the difference in color properties such as hue, value, and saturation between a plurality of images projected on the screen may be recognizable, and viewers feel the difference is unnatural and not acceptable.

However, the methods may not handle occurrence of a false contour when time division half-toning control is used for the DLP projector.

The conventional color correction methods are not capable of preventing the occurrence of false contours.