JPS60100183A - Iamge magnifier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image enlarging device that enlarges an image by performing inter-pixel calculations using a memory. Conventionally, image enlarging devices have already come in various configurations. One method that has been proposed and put into practical use that allows image enlargement with a relatively simple configuration is to display the same pixel for a longer period of time. For example, the first
The figure shows the image memory read controller 1.
The lower one bit of the X and Y address output by the is invalidated, and in order to further enlarge an arbitrary position, the address is operated through the address control circuit 2, and the image memory 3 is accessed to enlarge the image. 0, that is, the image is displayed as display data 3σ by reading out the data written in the image memory 3 twice, and is enlarged and displayed on the display device 4. Therefore, as shown in FIG. 2, the original image (A) becomes an enlarged image (B). Therefore, an image like that shown in FIG. 7(A) becomes noticeably jagged and degraded as shown in FIG. 7(E).

An object of the present invention is to perform good image enlargement by calculating and interpolating adjacent pixels. Examples will be described in detail below.

FIG. 3 is a block diagram of an embodiment of the present invention.

Reference numeral 5 denotes a read controller, and output address buses XA and YA directly access the memory 7 when no expansion is performed. 6 is an address control circuit, which arbitrarily sets the position to be enlarged from within the image when enlarging. ◇ 7 is an image memory, which stores the image data to be displayed. As shown in FIG. 4, four pixels including adjacent pixels can be accessed simultaneously in one access. For example, if (-+y) is given as the addresses XA' and YA', the A output will be the data at the address (2+y), the B output will be the data at the (x+1+V) address, and the C output will be the address (Z+11+1). The data at the address (Fog + 1 + y + 1) is output to the D output. 8 is an interpolation calculation memory, which stores interpolation data Z for the data A to D.
It is used to calculate. The interpolation position at this time is given by the read controller 5. Reference numeral 9 denotes a display device for displaying the output data z of the interpolation calculation memory 8 as an image.

Next, the operation will be explained. The 0 address control circuit 6, which is input to the address buses XA and YAiJ output from the read controller 5 and the address control circuit B, reads an arbitrary position by adding an offset value to each of X and Y for the given address. Extend lit. This address is given to the image memory 7, which outputs data A to D for four pixels including adjacent pixels as described above. This data is given to the interpolation calculation memory 8, and interpolation calculations are performed. The interpolation position is the least significant bit X of the X, Y address of the read controller 5. , Yo.

Interpolation is performed between two pieces of data, and when these are respectively p and q and the interpolated data is Z=f(pIq), the output data is shown in FIG. The display device M9 sequentially displays this data.

Therefore, the image enlarging device of the present invention sequentially performs interpolation between each pixel of the original image (A) as shown in FIG.
B), good enlargement can be performed.

For example, when the original image in FIG. 7(A) is enlarged with a conventional device, the image deteriorates as shown in FIG. 7(B), but with the device of the present invention, smooth enlargement is performed as shown in FIG. 7(0).

As described above, according to the present invention, since an enlarged image is obtained by instantaneously contacting each pixel with interpolated data obtained by interpolation calculation, image enlargement can be performed more smoothly than conventional methods. Ta. Furthermore, by changing the calculation method of the interpolation calculation memory, it can also be applied to image strength 1.

[Brief explanation of the drawing]

Figure 1 is a block IIj diagram of a conventional image enlarging device;
Figures (A) and (E) are explanatory diagrams showing enlarged images by a conventional image enlarger, Figure 6 is a block diagram of the image enlarger of the present invention, and Figure 4 is an image memory used in the present invention. , FIG. 5 is an explanatory diagram showing the input-output of the interpolation calculation memory used in the present invention, and FIG. 6 is an explanatory diagram showing an image enlarged by the image enlarging device of the present invention. , Fig. 7(A), CB) l (0) are explanatory diagrams showing examples of images when the original image trap is enlarged using a conventional device and when enlarged using the device of this research. . 5. Readout controller 6. Address control circuit 7. Image memory 8. ) (B) Figure 3 Figure 4

Claims (1)

[Claims] An image memory containing pixels for one screen, an address control circuit connected to this image memory for controlling readout of the image memory, a readout controller connected to this address control circuit, and the image memory and readout controller. Supplementary law calculation memory connected to
An image enlarging device characterized in that the image enlarging device is configured to display interpolated data outputted by the interpolation calculation memory in instant contact with each pixel of the image memory.