JP2826102B2 - Image superposition method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of superimposing a plurality of images by a personal computer and converting it into one image. <Summary of the Invention> The present invention provides a relatively simple and inexpensive method of superimposing a plurality of color images by performing image processing using a personal computer having a memory for two screens of color images and an image input device. It is intended to be realized with a simple device. <Prior Art> Conventionally, superposition of images has already been performed in television stations and the like. This is to display an image in which another background is superimposed on the background of a person shown on the current screen in real time. <Problems to be Solved by the Invention> However, in order to realize this, a very expensive dedicated system was required, and it was not within the reach of individuals. <Means for Solving the Problems> However, recently, image input devices for personal computers have been commercialized at low cost, and image processing and the like using personal computers has become easy. Therefore, in the present invention, superposition of images is performed using a personal computer. <Operation> This makes it possible to superimpose images with an inexpensive device. <Embodiment> FIG. 1 is a block diagram of an embodiment of the present invention. In FIG. 1, an image signal source 1 is a VTR, a video camera, a television receiver, or the like, from which a composite video signal is output. The primary color conversion circuit 2 functions as an image input device, and here, converts a composite video signal into RGB 3 signals.
Separate into colors. The switching circuit 3 selectively outputs the input RGB signals to two output terminals. Main graphic RAM5
Is usually provided in personal computers, and RGB
Are stored for each of the three colors, and the stored image information is output to a display device 8 composed of a color CRT as necessary. The sub graphic RAM 4 is a memory having the same configuration as the main graphic RAM 5. Reference numeral 6 denotes a CPU, reference numeral 7 denotes a memory in which a program for an image superimposing operation is stored, and reference numeral 9 denotes a color printer which prints out image information stored in the main graphic RAM 5. Next, FIG. 2 is a diagram showing a basic configuration of a processing procedure by a program. In this figure, a main graphic RAM stores a previous image serving as mask data, and a sub-graphic RAM
Stores a post-image serving as background data. The data stored in each ROM is taken into a working memory (not shown in FIG. 1) in units of 256 bytes. At this time, in the data of the previous image from the main graphic RAM, the processing is performed so that the part of the key color set in advance becomes a missing image and the part of the color other than the key color remains as a max image, and then the data is taken in. Thereafter, the mask image and the subsequent image are compared, and the position where the mask image and the subsequent image overlap is given priority to the mask image, and the position where no mask image exists is given priority to the subsequent image. Store the original location in RAM. Further, a more specific program processing procedure will be described with reference to the flowcharts of FIGS. FIG. 3 shows a main flowchart, FIG. 4 shows a subroutine A flowchart, and FIG. 5 shows a subroutine B flowchart. First, the main program of FIG. 3 will be described. Starting with this program, in the first step, a key color for setting a missing image in the previous image is set, and then the number of blocks of the entire graphic RAM is set using 256 bytes as a unit block. In the third step, a subroutine B shown in FIG. 5 is called. This subroutine B is the main graphic RA
This is a program for creating a mask image in which the key color portion is omitted from the previous RGB three-color image corresponding to the block indicated by the counter 1 in M. When the subroutine B is completed, the process proceeds to the fourth step of the main program, where the blue component of the post-image of the block indicated by the counter 1 in the sub-graphic RAM is read into the working memory. In the fifth step, a subroutine A shown in FIG. 4 is called. The subroutine A compares the mask image created in the subroutine B with the blue component of the image read in the fourth step of the main program, and stores the comparison data in the original block in the main graphic RAM. It is a program for. When the subroutine A is completed, the process proceeds to the sixth and seventh steps of the main program, where the same operation as the fourth and fifth steps is performed for the red component. In the eighth and ninth steps, the same operation as the fourth and fifth steps is performed on the green component. In a tenth step, the counter 1 is decremented by one. In an eleventh step, it is determined whether or not the counter 1 is 0. If not, the process returns to the third step. In other words, graphic RA
Similar processing is sequentially performed for all blocks in M. By the above-described processing, the superimposed image is a state in which the image excluding the key color portion of the previous image and the rear image of only the key color portion of the previous image are combined. The image thus obtained is displayed on the display device 8 from the main graphic RAM 5 or printed out from the color printer 9 via the CPU 6, as shown in FIG. <Effects of the Invention> As described above, in the present invention, a plurality of color images are superimposed on each other by using a personal computer. Are superimposed on each other, so that the mask images can be clearly superimposed in a predetermined state.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an image processing apparatus according to the present invention, FIG. 2 is a diagram showing a basic configuration of a processing procedure according to a method of the present invention, and FIGS. 3 is a flowchart of an image processing program according to the method of the present invention. FIG. 3 shows a main program, FIG. 4 shows a subroutine A, and FIG. 5 shows a subroutine B. 1: Image signal source, 2: Primary color conversion circuit, 3: Switching circuit, 4: Sub graphic RAM, 5: Main graphic RAM, 6: CPU, 7:
Program memory, 8: display device, 9: color printer.

Continuation of front page       (56) References JP-A-58-144363 (JP, A)                 JP-A-60-216687 (JP, A)                 JP-A-60-190078 (JP, A)                 JP-A-58-144363 (JP, A)

Claims (1)

(57) [Claims] Using a personal computer including an image memory for storing color image information for two screens and an image input device for converting a video signal into an image signal to the memory, the first and the second images are transmitted through the image input device. 2 stores different images in the second image memory, creates a mask image based on a preset key color from the image stored in the first image memory, and stores the mask image in the mask image and the second image memory. The stored image is compared with the stored image to obtain a signal obtained by superimposing the mask image and the image stored in the second image memory by giving priority to the mask image. In the method for superimposing images in one image memory, each of the first and second image memories comprises a memory for three colors of red, green and blue, respectively. The data from the first and second image memories are respectively taken into the first and second working memories by a predetermined amount.
The data of the image from the first image memory is processed after processing so that a part of a key color set in advance becomes a missing image, and a part of a color other than the key color remains as a mask image. From the first and second working memories, the first
And compares the read mask image with the image read from the second working memory, and the mask image and the image read from the second working memory overlap with each other. The position gives priority to the mask image, and the position where the mask image does not exist outputs the image read out from the second working memory, and compares the comparison output with the first color of the first image memory. And the second working memory from the first and second working memories.
And compares the read mask image with the image read from the second working memory, and the mask image and the image read from the second working memory overlap with each other. The position gives priority to the mask image, and the position where the mask image does not exist outputs the image read from the second working memory, and compares the comparison output with the second color of the first image memory. Then, the third color data is read from the first and second working memories, and the read mask image and the third color data are read from the second working memory. When the mask image and the image read from the second working memory overlap each other, the position where the mask image overlaps takes precedence, and the position where the mask image does not exist is the second position.
Output the image read from the working memory of
An image superimposing method, wherein the comparison output is stored in an original position of a third color portion of the first image memory.