JPH01145780A - Picture reducing and displaying method - Google Patents

Abstract

PURPOSE:To obtain a reduced picture without sensing discontinuity on a boundary part between pictures by storing the picture data of a reducing area in a storing part. CONSTITUTION:At the time of storing, the number of picture elements of a divided area corresponding to the maximum reduction ratio of a vertical direction and a horizontal direction allowed by a system is stored in the storing part 105 as a vertically and horizontally enlarged reducing area and at the time of retrieving, grid points constituted by dividing the vertical direction and the horizontal direction of the whole picture by the number of the picture elements corresponding to the ratio in arbitrary vertical and horizontal directions respectively are matched to the one dot of the reduced picture, the mean value of the luminance value of the picture in a small area enclosed by the grid points in the vicinity is applied as the luminance value of the grid points to reduce the picture and display. Thereby, the reduced picture can be obtained without sensing the discontinuity on the boundary part of the divided picture.

Description

[Detailed description of the invention] (1) Technical field to which the invention belongs The present invention is a one-image database system.

The present invention relates to an image reduction display method for displaying an image selected by a search in a reduced size.

(2) Conventional technology In an image data storage system, as a method to shorten the time to obtain a desired image and improve the user interface, five images are divided into multiple areas with priority levels during storage. There is a method to display the areas in order of priority when searching.
No. ``Image storage and display method'').

In some cases, high-definition images selected as a result of a search are reduced and displayed according to the resolution of the display device, or when multiple images are selected as a result of a search, each image is reduced and displayed on one screen. Displaying multiple images together is effective in terms of man-machine interface.

From the above points, by performing the above-mentioned reduced display in the method of Japanese Patent Application No. 62-264226, each effect can be utilized, and the man-machine interface can be further improved.

The conventional method for reducing one image is to divide the entire image into blocks consisting of 2 dots x 2 dots, or 3 dots x 3 dots, etc., depending on the size of the reduced image, and each block is A commonly used method is to make each pixel correspond to one dot of a reduced image, and to make the luminance value the average value of the luminance values of each pixel of the block.

However, this method can be applied as is in the patent application No. 62-264226.
When applying the method of No. 1, the reduction processing is not performed for the entire image, but for each divided region + In the boundary part of the SI area, the area boundary and block boundary are generally Since these do not match, there is a possibility that the reduced image corresponding to the connecting portion between the regions becomes discontinuous, and a normal reduced image cannot be obtained. Further, a similar problem occurs when one image is divided into a plurality of partial images and stored for convenience of use or storage, and when it is desired to display the entire screen in a reduced size.

(3) Purpose of the Invention An object of the present invention is to provide an image reduction display method when one image is divided into a plurality of partial images.

(4) Structure of the invention (4-1) Differences between the characteristics of the invention and the conventional technology The present invention has the following features:
To achieve the above purpose, when dividing one image into multiple areas and storing them, the vertical reduction ratio is set to (number of vertical pixels of original image) / (number of vertical pixels of reduced image), horizontal If the reduction ratio in the direction is defined as (number of pixels in the horizontal direction of the original image) / (number of pixels in the horizontal direction of the reduced image), then in order to ensure that the block boundaries for reduction processing are sufficiently included in the area, The image data of the area (hereinafter referred to as the area for reduction processing) that is expanded in the vertical and horizontal directions by the number of pixels corresponding to the maximum vertical and horizontal reduction ratio allowed by the system is stored in the storage unit. The main feature is that the above-mentioned reduction processing area is sequentially retrieved from the storage section and displayed after being stored and searched, and the reduction processing is performed based on arbitrary vertical and horizontal reduction ratios. This differs from conventional technology in these respects.

(4-2) Embodiment This embodiment takes as an example a method of creating a reduced image by making the average value of pixel brightness within a block correspond to the lower right pixel of the block.

FIG. 1 is a flow chart of one embodiment of the present invention. FIG. 2 is a diagram for explaining the present invention in detail, 100.
101 is a display section, 102 is an input section, 103 is a display section 1
A reduction processing unit 104 controls the display unit 101 and the input unit 102 to divide the image into a plurality of regions, and assigns an area for reduction processing to each region. 105 is a storage unit that stores image data of each reduction processing area; 106 is an M product control unit that controls the storage unit 105; and 107 is a central control unit that controls the entire area. Further, FIG. 3 is a diagram for explaining the reduction processing area during accumulation of the present invention,
1°2.3 is the original divided area, and 4 is the entire image.

In addition, 1' (black dot area), 2' (left diagonal line), and 3' (right diagonal line) are reduction processing areas corresponding to original divided area 1.2.3, respectively, and Nl is the maximum vertical direction. The number of pixels corresponding to the reduction ratio, N2, is the number of pixels corresponding to the maximum reduction ratio in the horizontal direction.

FIG. 4 is a diagram for explaining a reduction processing method in the reduction processing section of FIG. 2. The illustrated lattice points indicate pixels after reduction, the thick lines indicate divided areas, and the broken lines indicate areas expanded as reduction processing areas (some lattice points corresponding to pixels of the original image are also shown). ). In addition, Nl is the number of pixels corresponding to the maximum reduction ratio in the vertical direction, N2 is the number of pixels corresponding to the maximum reduction ratio in the horizontal direction, and Ml is the number of pixels corresponding to the maximum reduction ratio in the vertical direction.
is the number of pixels corresponding to the arbitrary reduction ratio in the horizontal direction,
Y is the horizontal and vertical direction of the image, (0,0) is the origin of the image, (Xa, Ya), (Xb, Yb)
are the position coordinates of the upper left corner and lower right corner of the layer division area, respectively.

XO, XI, X2, . . . are division points in the X direction according to the reduction ratio, and YO, Yl, Y2, . . . are division points in the X direction according to the reduction ratio.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to FIGS. 1 to 4.

First, one entire image is inputted from the input section 102 and displayed on the one display section 101 via the frame generation control section 104.

■ Divide the entire two images into multiple regions using a man-machine interface. In the example of FIG. 3(a).

Assume that the entire image is divided into regions 1, 2, and 3. Next, in the Ni region generation control 104, each region is
■ Find the area expanded according to the maximum reduction rate. That is,
The maximum vertical reduction rate allowed by the system is α1
(1≦αl), and the maximum horizontal reduction rate is α2 (1≦α
2), each divided wI area has the number of pixels N1 (Nl=[α1+11. However, [X
l represents the largest integer not exceeding X) 9 pixel number N2 (N
2-[α2+IL, where Xl represents the largest integer not exceeding X) (Fig. 3(b))
1', 2', 3') are determined as the area for reduction processing. N1 in this case. Since the value of N2 is a system-fixed value, it is set by the central control unit 107 that manages the entire system when the area generation control unit 104 is activated. Next, the area generation control unit 104 notifies the central;h control unit 107 of the position coordinates of the 1 minute original area and the position coordinates of the reduction processing area. The central control unit 107
Based on the position coordinates of the area for reduction processing, the area generation control unit 1
04. Activate the storage control unit 106 and transfer the image data in the reduction processing area to the storage unit ]05. The above operations are repeated for all reduction processing areas in the image.

During a search, when the central control unit 107 detects a search request made via the display unit 100 in FIG. 2, it divides the image according to the reduction ratio and calculates grid points.

The central control unit 107 activates the storage control unit 106 and sequentially retrieves image data of the reduction processing area for the image selected as a result of the search from the storage unit 105.■, 1i! The data is transferred to the small processing unit 103. Further, the central control unit 107 sets the reduction rate at the time of search, that is, the vertical reduction rate β1 (1≦βl≦αl) to the 1-reduction processing unit 103.

Horizontal reduction rate β2 (1≦β2≦α2), $ for reduction processing
] The position coordinates of the layer division area corresponding to the area 9 gives the display position on the display section 100. Note that the reduction ratio β1°β2 may be given by the searcher via the display unit 100, or may be determined in advance for each image. Reduction processing unit 10
3, first, the number of pixels M corresponding to the vertical reduction rate βl is
1 by M1=β1, and the number of pixels M2 corresponding to the horizontal reduction rate β2 by M2=β2, as shown in FIG.

Dividing points XO, Xi, X2, etc. consisting of M22 pixel intervals in the horizontal direction (X direction) of the image, and in the vertical direction (
dividing points YO, Yl with an interval of M11 pixels in the X direction)
, Y2... is determined. When the values of Ml and M2 are real numbers, for the X direction, the positions obtained by rounding off the decimal point of M2*1 (I≧1) are set as Xl, X2..., and for the X direction, M1*J The positions after the decimal point of (J≧1) may be rounded off to Yl, Y2, . . . . Next, the division point Xi in the X direction within the subdivision area
(i≧0) and the dividing point Yj (j≧0) in the X direction is found from the position coordinates of the layer divided area (
(circled point in Figure 4).

Furthermore, let that grid point correspond to one pixel of the reduced image for the added S'ilT area, and take its brightness value.

■ Gives the average brightness value of the image within the small area surrounded by the upper left grid points. That is, in FIG.

Find the lattice point (intersection of X=Xi (8≧i≧4) and Y=Yj (9≧j≧4)) in the subdivision area from the position coordinates (Xa, Ya, Xb, Yb) of the layer division area. .

Furthermore, for example, as the brightness value of one pixel of the reduced image corresponding to the intersection of X=X6 and Y=Y7, X=X5. X=X
6. Y=Y6. The average value of the brightness values of the image within the small area surrounded by Y=Y7 is given.

The above processing is performed on all grid points within the subdivision area to obtain a reduced image. For the boundary part of the layer divided area, when storing two images, the image data for the layer divided area is ! i
i! Since the image data in the small processing area (dotted line area in Figure 4) is stored, and Nl≧Ml and N22M2,
The above-mentioned reduction processing can be performed only from the image data within the reduction processing area. By performing the reduction process as described above, the connection portion between regions can also be reduced without any problem. In the reduction processing unit 103, when the above-mentioned reduction processing is completed.

The reduced image is displayed on the display section 100 according to the display position information on the display section 100 given by the central control section 107.

The above reduction processing in the reduction processing unit 103 is performed by the search ? This is sequentially performed on all the reduction processing areas for the resulting image.

In the above reduction processing method, the small area of the layered image for determining the luminance value of one pixel of the reduced image is related to how the area for reduction processing is set during storage, and is reduced as described above. If the processing area extends the subdivision 9i area (i) upward and to the left, the small area on the upper left of the grid point; (ii) when the area is expanded upward and to the right, the small area on the upper right; (iii)
) If expanded downward or to the left, the small area at the lower left, (i
v) When expanding downward or to the right, just select the small area at the bottom right.

As described above, during storage, the two divided areas are stored as reduction processing areas that are expanded in the vertical and horizontal directions by the number of pixels corresponding to the maximum vertical and horizontal reduction ratios allowed by the system, and then searched. Sometimes.

A grid point that can be constructed by dividing the entire image in the vertical and horizontal directions by the number of pixels corresponding to an arbitrary vertical and horizontal reduction ratio, respectively, is made to correspond to one dot in the reduced image, and the brightness value of that grid point is By reducing and displaying the image by giving the average value of the brightness values of the image within a small area surrounded by neighboring grid points, it is possible to reduce and display the image without causing discontinuity even at the boundary of the divided image. You can get a reduced image.

(5) As described in detail, according to the present invention, when displaying divided images in a sequentially reduced size, it is possible to obtain reduced images without causing discontinuity even at the boundary between the two images. Can be done. Furthermore, by using the invention in combination with the invention of Japanese Patent Application No. 62-264226, desired information in the image can be obtained quickly even in a reduced image, and the user interface can be further improved.

[Brief explanation of the drawing]

FIG. 1 is a flowchart of an embodiment of the present invention, FIG. 2 is a diagram for explaining the details of the present invention, FIG. 3 is a diagram for explaining the reduction processing area, and FIG. 4 is a diagram similar to that of FIG. 3 is a diagram for explaining a reduction processing method in a reduction processing unit 103. FIG. 100, 101: Display section, 102: Input section,
103: reduction processing unit, 104: area generation control unit,
tO5: Accumulator. 106: Accumulation control section, 10'7: Central control section. 1.2.3: Addition region. 4: Entire image. 1', 2', 3': Area for reduction processing. X, Y: Horizontal and vertical directions of both images 5 N1. N2: Number of pixels corresponding to the maximum reduction ratio in the vertical and horizontal directions. Ml, N2: Number of pixels corresponding to arbitrary reduction ratios in the vertical and horizontal directions. (0,0): Image origin (Xa, 'i'a), (Xb, 'y'b): Position coordinates 1 of the upper left corner and lower right corner of the subdivision area XO, Xi, N2...・: Division point according to the reduction ratio in the horizontal direction (X direction). YO, Yl, Y2...: Division points corresponding to the reduction ratio in the vertical direction (X direction). Patent applicant Nippon Telegraph and Telephone Corporation

Claims (1)

[Claims] An image database system having at least means for accumulating images, means for searching for images, and means for displaying images, wherein when an image is composed of a plurality of area parts, When storing images in the means, each area is stored as an area expanded vertically and horizontally by the number of pixels corresponding to the maximum vertical and horizontal reduction ratio allowed by the system, and the image search When searching by means, the grid points obtained by dividing the image vertically and horizontally by the number of pixels corresponding to the arbitrary vertical and horizontal reduction ratios are made to correspond to one pixel of the reduced image, and the brightness is An image reduction display method characterized in that a region portion is reduced and displayed on the image display means by using an average value of luminance values in a region near the grid point as a value.