JPS63104186A - Picture enlarging device - Google Patents

Abstract

PURPOSE:To enlarge a picture which is approximate to an original picture by permitting a space product sum calculating circuit to interpolate data. CONSTITUTION:Multigradation picture data (x-lines X y-lines) is stored. Before data is transferred to a buffer memory 3 from an accessible frame memory 1 on a line basis, a CPU 7 creates an address conversion table in a look-up table LUT 5. Afterwards an address counter 4 is incremented or decremented. An address is given to the buffer memory 3 through a selector 8 and data is written in the buffer memory 3. Then an input from the selector 8 is switched to the LUT 5 from the address counter 4, which is incremented or decremented. An address is given to the buffer memory 3 through the LUT 5 and the selector 8. The space product sum calculating circuit 6 interpolates data outputted from the buffer memory 3. Picture data is written in the frame memory 1 or a display memory 2, and a picture is displayed on a display device 9.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image enlarging device for enlarging a multivalued image.

2. Description of the Related Art In conventional image enlargement devices, when enlarging by n times, pixels are
By continuing the process, enlargement processing was realized without interpolation processing.

Problems to be Solved by the Invention These conventional devices have the drawback of not performing interpolation processing, resulting in a mosaic-like image. SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide an image enlarging device capable of enlarging an image and interpolating image data.

Means for Solving the Problems In order to achieve the above object, the present invention provides the frame memory with a line-by-line access function, enlarges the image in the vertical direction, and uses an address counter, lookup table, and buffer memory. Perform horizontal expansion. Furthermore, interpolation processing is performed in a spatial product-sum calculation circuit.

Operation The present invention has the above-described configuration, and performs multiple reading of image data according to the enlargement ratio using the frame memory, address counter, lookup table, and buffer memory, and performs interpolation processing using the spatial product-sum calculation circuit. Enlarge the image.

Embodiment FIG. 1 is a block diagram showing an embodiment of the image enlarging apparatus of the present invention. In FIG. 1, before data is transferred from a frame memory 1 that stores multi-gradation image data (X lines x y lines) and can be accessed line by line to a buffer memory 3, a lookup table (
An address translation table is created in 6 (hereinafter referred to as LUT).

Thereafter, the address counter 4 is counted up (down), an address is given to the backup memory 3 via the selector 8, and data is written in the backup memory 3. Next, the input of selector 8 is switched from address counter 4 to LUTs, and address counter 4 is counted up (down).
L, LUT6. An address is given to the pack 7 memory 3 via the selector 8, the output data from the buffer memory 3 is interpolated by the spatial product-sum operation circuit 6, and the frame memory 1. Alternatively, image data is written in the display memory 2 and the image is displayed on the display device 9.

FIG. 2 shows an embodiment of the spatial product-sum calculation circuit.

In FIG. 2, n lines of image data are written into n input line buffers 11 via an input latch 10, and a multiplier 12 multiplies the image data by an operator in an operator buffer 16 pixel by pixel. The adder 13 adds the data, the lookup table 14 outputs the average value for the input data, and the output latch 16 writes the image data to the frame memory 1° or the display memory 2 and displays the image data. Display on device 9.

As an example, in the case of three-fold enlargement, a conversion table created in the LUTs is shown in FIG. 3, and an operator of the spatial product-sum calculation circuit is shown in FIG. 4 for explanation. Access the 0th line of the area to be enlarged in frame memory 1, write image data to buffer memory 3, then use the conversion table of LUT 6 to read pixel data from the buffer memory and transfer it to the spatial product-sum calculation circuit. . After repeating this process three times, the fourth
A spatial product-sum operation is performed using the operators shown in the figure, and the operation results are written into the frame memory 1 or the display memory 2. Next, access the 1st line of frame memory 1, write to the buffer memory in the same way as the 0th line, read it, transfer it to the spatial product-sum calculation circuit, and write 2 lines on the 0th line and 1 line on the 1st line of the frame memory. Performs spatial product-sum operation, and stores frame memory 1 in frame memory 1.
, or write the calculation result to the display memory 2. The following is a spatial product-sum calculation for one line on the 0th line and two on the 1st line of the frame memory, a spatial product-sum calculation for three on the 1st line, and a 2nd spatial product on the 1st line.
The spatial product-sum operation for the book and the second line is repeated to enlarge the image.

Above, we have described the steps for enlarging an image. When using the operator shown in Figure 4 of the spatial product-sum operation circuit, the operator buffer and multiplication section in Figure 2 are not required, so the image can be enlarged with fewer configurations. The device can be realized.

Effects of the Invention As described above, according to the present invention, it is possible to enlarge an image that has been subjected to interpolation processing, that is, to enlarge an image closer to the original image.

[Brief explanation of the drawing]

FIG. 1 shows an image enlarging device according to an embodiment of the present invention...
...Frame memory, 2...Display memory, 3
...Buffer memory, 4...Address counter, 6...Lookup table (LU
T), 6... Spatial product-sum calculation circuit, 7...
・CPU, s...Selector, 9...Display device. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 4

Claims (2)

[Claims] (1) A frame memory that stores multi-gradation image data (x dots x y lines) and can be accessed line by line, a display memory that displays image data on a display device, and image data that is transferred line by line. A line buffer memory having a look-up table for temporarily storing and manipulating the address is provided in front of the address, and by manipulating the write address and read address of the line buffer memory, the image is enlarged by n times in the line direction. . An image enlarging device that performs interpolation processing on the output of the line buffer using an n×n spatial product-sum calculation circuit, writes the interpolation process to the frame memory or the display memory, and outputs the result to the display device. (2) The spatial product-sum operation circuit includes an input latch, n input line buffers, an operator buffer, a multiplier, an adder, a look-up table, and an output latch, and includes an operator stored in the operator buffer. 2. The image enlarging apparatus according to claim 1, which outputs an average value of n×n pixels in the case of n-fold enlargement by selecting a look-up table.