DISPLAY CONTROL APPARATUS, METHOD OF CONTROLLING THE SAME, AND NON-TRANSITORY COMPUTER-READABLE STORAGE MEDIUM

• US 20180054602A1
• Filed: 11/03/2017
• Published: 02/22/2018
• Est. Priority Date: 10/30/2014
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Ouchi, Akihiro
• Granted Patent: US 10,205,922 B2
• Time in Patent Office: Days
• CPC Class Codes: G06T 2207/10016 Video; Image sequence
• CPC Class Codes: G06T 2207/20224 Image subtraction
• CPC Class Codes: G06T 5/50 using two or more images, e.g. averaging or subtraction
• CPC Class Codes: G06T 5/80 Geometric correction
• CPC Class Codes: H04N 9/3179 Video signal processing therefor
• CPC Class Codes: H04N 9/3182 Colour adjustment, e.g. white balance, shading or gamut white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607
• CPC Class Codes: H04N 9/3185 Geometric adjustment, e.g. keystone or convergence optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14
• CPC Class Codes: H04N 9/3194 including sensor feedback

Abstract

A display control apparatus which projects and displays at least one image on a screen, converts a frame frequency for a display of the at least one image to N times (N>1), generates an added image by adding a predetermined pattern to the converted frame and a subtracted image by subtracting the predetermined pattern from the converted frame as a first frame and a second frame following the first frame, projects the generated first frame and the second frame for an image on the screen at the N-times frequency, acquires the image projected on the screen, extracts the pattern from the acquired image, and corrects a shape of the image based on the extracted pattern.

Claims

1-10. -10. (canceled)

11. A display control apparatus comprising:

at least one hardware processor; and

a memory which stores instructions executable by the at least one hardware processor to cause the display control apparatus to perform;

increasing pixel values of a plurality of predetermined positions on a first image based on an image frame of an inputted image signal;

decreasing pixel values of the plurality of predetermined positions, which are the same as positions where the pixel values of the first image are increased in the increasing, on a second image based on the image frame;

performing projection control to control a projection unit so that N image frames, which are based on the image frame and include both the first image whose pixel values have been increased in the increasing and the second image whose pixel values have been decreased in the decreasing, are projected at a frequency that is N-times a frame frequency according to the inputted image signal, wherein N is greater than 1;

acquiring, based on a captured image obtained by a capturing unit for capturing a projection surface where an image is projected according to the projection control, a parameter for adjusting an image to be projected by the projection unit; and

performing adjustment processing for adjusting, based on the parameter acquired in the acquiring, the image to be projected on the projection surface by the projection unit.

12. The display control apparatus according to claim 11, wherein the projection unit is controlled by the projection control so that the first image whose pixel values have been increased in the increasing and the second image whose pixel values have been decreased in the decreasing are successively projected.

13. The display control apparatus according to claim 11, wherein the first image whose pixel values have not been increased in the increasing is the same as the second image whose pixel values have not been decreased in the decreasing.

14. The display control apparatus according to claim 11, wherein

in the increasing, pixel values of the plurality of predetermined positions on each of one or more images included in the N image frames are increased, and wherein

in the decreasing, pixel values of the plurality of predetermined positions on each of one or more images included in the N image frames are decreased, and wherein

a number of increased images whose pixel values are increased in the increasing is the same as a number of decreased images whose pixel values are decreased in the decreasing.

15. The display control apparatus according to claim 11, further performs:

specifying a plurality of positions in the captured image corresponding to the plurality of predetermined positions, wherein

in the acquiring, the parameter is acquired based on a result of the specifying the plurality of positions in the captured image.

16. The display control apparatus according to claim 15, wherein

in the specifying, the plurality of positions is specified based on a difference between a first captured image obtained by capturing the projection surface where an image according to the first image is projected and a second captured image obtained by capturing the projection surface where an image according to the second image is projected.

17. The display control apparatus according to claim 11, wherein the plurality of predetermined positions are set based on encoding coordinate information.

18. The display control apparatus according to claim 11, wherein an amount of increase in the pixel values in the increasing and an amount of decrease in the pixel values in the decreasing are determined based on a characteristic of the projection unit.

19. The display control apparatus according to claim 11, wherein

in the increasing, an amount of increase in a pixel value of a specific position among the plurality of predetermined positions on the first image is determined so that the amount of increase in a first case where the pixel value of the specific position on the first image exceeds a first threshold is less than the amount of increase in a second case where the pixel value of the specific position on the first image is below the first threshold, and wherein

in the decreasing, an amount of decrease in a pixel value of the specific position on the second image is determined so that the amount of decrease in the first case is less than the amount of decrease in the second case.

20. The display control apparatus according to claim 11, wherein

in the decreasing, an amount of decrease in a pixel value of a specific position among the plurality of predetermined positions on the second image is determined so that the amount of decrease in a third case where the pixel value of the specific position on the second image is below a second threshold is less than the amount of decrease in a fourth case where the pixel value of the specific position on the second image exceeds the second threshold, and wherein

in the increasing, an amount of increase in a pixel value of the specific position on the first image is determined so that the amount of increase in the third case is less than the amount of increase in the fourth case.

21. The display control apparatus according to claim 11, wherein

the capturing unit is a camera which is capable of communication with the display control apparatus.

22. The display control apparatus according to claim 11, wherein

the projection unit is a projector apparatus which is capable of communication with the display control apparatus.

23. The display control apparatus according to claim 22, wherein

in the adjustment processing, the parameter acquired in the acquiring is outputted to the projection unit for adjusting the image to be projected on the projection surface.

24. The display control apparatus according to claim 11, further comprising the capturing unit and the projection unit.

25. A display control method executed by a display system, the method comprising:

increasing pixel values of a plurality of predetermined positions on a first image based on an image frame of an inputted image signal;

decreasing pixel values of the plurality of predetermined positions, which are the same as the positions where the pixel values of the first image are increased in the increasing, on a second image based on the image frame;

performing projection control to control a projection unit so that N image frames, which are based on the image frame and include both the first image whose pixel values have been increased in the increasing and the second image whose pixel values have been decreased in the decreasing, are projected at a frequency that is N-times a frame frequency according to the inputted image signal, wherein N is greater than 1;

acquiring, based on a captured image obtained by a capturing unit for capturing a projection surface where an image is projected according to the projection control, a parameter for adjusting an image to be projected by the projection unit; and

performing adjustment processing for adjusting, based on the parameter acquired in the acquiring, the image to be projected on the projection surface by the projection unit.

26. The display control method according to claim 25, wherein the projection unit is controlled by the projection control so that the first image whose pixel values have been increased in the increasing and the second image whose pixel values have been decreased in the decreasing are successively projected.

27. The display control method according to claim 25, wherein the first image whose pixel values have not been increased in the increasing is the same as the second image whose pixel values have not been decreased in the decreasing.

28. A non-transitory computer-readable storage medium which stores a computer program for causing a computer to execute a method of controlling a display control apparatus, the method comprising:

increasing pixel values of a plurality of predetermined positions on a first image based on an image frame of an inputted image signal;

decreasing pixel values of the plurality of predetermined positions, which are the same as the positions where the pixel values of the first image are increased in the increasing, on a second image based on the image frame;

performing projection control to control a projection unit so that N image frames, which are based on the image frame and include both the first image whose pixel values have been increased in the increasing and the second image whose pixel values have been decreased in the decreasing, are projected at a frequency that is N-times a frame frequency according to the inputted image signal, wherein N is greater than 1;

acquiring, based on a captured image obtained by a capturing unit for capturing a projection surface where an image is projected according to the projection control, a parameter for adjusting an image to be projected by the projection unit; and

performing adjustment processing for adjusting, based on the parameter acquired in the acquiring, the image to be projected on the projection surface by the projection unit.