Image processing apparatus, display system, image processing method and storage medium for projecting a moving image onto printed matter in an overlapping manner

1. An image processing apparatus that generates a print image for outputting printed matter onto which two or more images are projected in an overlapping manner, the apparatus comprising:

one or more processors; and

one or more memories storing instructions, when executed by the one or more processors, causing the apparatus to function as:

an acquisition unit configured to acquire an image at least including an object; and

a first generation unit configured to perform saturation reduction processing for an area of the object in the acquired image in a case where change in color between the two or more images is larger than a predetermined threshold value and to generate the print image based on the image whose saturation is reduced by the saturation reduction processing.

2. The image processing apparatus according to claim 1 , wherein

onto the printed matter, at least a first image and a second image in which color of the object is different from that in the first image are projected successively in the overlapping manner.

3. The image processing apparatus according to claim 1 , wherein

the two or more images are frames configuring a moving image and

in the moving image, the object changes in color in a time series.

4. The image processing apparatus according to claim 3 , wherein

the change in color is a change in hue.

5. The image processing apparatus according to claim 3 , wherein

in the saturation reduction processing, for the area of the object, the maximum pixel value through each of the frames is adopted for each channel of RGB.

6. The image processing apparatus according to claim 3 , wherein

in the saturation reduction processing, a pixel value of each channel of RGB in the area of the object whose color changes in each of the frames is rewritten to the same value.

7. The image processing apparatus according to claim 3 , wherein the one or more memories storing instructions, when executed by the one or more processors, cause the apparatus to further function as

a second generation unit configured to generate the moving image based on the print image generated by the first generation unit.

8. The image processing apparatus according to claim 7 , wherein

the second generation unit generates a moving image so that a result of dividing target luminance in a result of the projection onto the printed matter being performed by reflectance of the printed matter becomes luminance in the moving image to be projected.

9. The image processing apparatus according to claim 1 , wherein

the two or more images are represented in an RGB color space and

the saturation reduction processing is processing to approximate a pixel value of each channel of RGB in the area of the object.

10. The image processing apparatus according to claim 9 , wherein

the saturation reduction processing is performed via a pixel value obtained by converting a pixel value represented in an RGB color space into a uniform color space.

11. The image processing apparatus according to claim 10 , wherein

the uniform color space is a Lab color space and

the saturation reduction processing is processing to adjust a distance from the origin so as not to exceed a predetermined upper limit value while substantially keeping an inclination from the origin on an a-b plane of a pixel value represented in a Lab color space.

12. The image processing apparatus according to claim 1 , wherein

the saturation reduction processing is performed by excluding an edge portion of the area of the object.

13. The image processing apparatus according to claim 1 , further comprising:

a user interface receiving specification relating to generation of the print image, wherein

the first generation unit generates the print image based on information specified via the user interface.

14. The image processing apparatus according to claim 13 , wherein

the information specified by a user via the user interface is data of a still image at least including the object whose color changes, in which intention of the user for the print image is reflected and

the first generation unit generates the print image by performing processing to put the print image close to the still image.

15. The image processing apparatus according to claim 13 , wherein

the information specified by a user via the user interface is information relating to an area for which the saturation reduction processing is performed and

the first generation unit performs the saturation reduction processing for an area specified by the information.

16. A method in an image processing apparatus that generates a print image for outputting printed matter onto which two or more images are projected in an overlapping manner, the method comprising the steps of:

acquiring an image at least including an object;

performing saturation reduction processing for an area of the object in the acquired image in a case where change in color between the two or more images is larger than a predetermined threshold value; and

generating the print image based on the image whose saturation is reduced by the saturation reduction processing.

17. A non-transitory computer readable storage medium storing a program for causing a computer to perform a method in an image processing apparatus that generates a print image for outputting printed matter onto which two or more images are projected in an overlapping manner, the method comprising the steps of:

acquiring an image at least including an object;

performing saturation reduction processing for an area of the object in the acquired image in a case where change in color between the two or more images is larger than a predetermined threshold value; and

generating the print image based on the image whose saturation is reduced by the saturation reduction processing.