JPS63278464A - Image scaling device - Google Patents

Abstract

PURPOSE:To improve the picture quality of an output image, by deleting the picture element inputs of adjacent two picture elements, and adding the picture data (for example, a mean value) of one picture element found from the two deleted picture element inputs. CONSTITUTION:The titled device is constituted of a data selector 9 which selects either the output of a function generator 8 or that of a first data buffer 3, a scale control part 5 which outputs a scale control signal with generation frequency corresponding to a scale factor, a thin-out means 4 which thins out an input synchronizing signal in a picture element unit, a timing adjusting part 10 controlled by the output of the scale control part 5 and outputs a signal controlling the thin-out means 4 and a selection signal controlling the data selector 9, and a second data buffer 11 which holds the output of the data selector 9 by synchronizing with the output of the thin-out means 4, and the output of the second data buffer 11 is set as an image output, and that of the thin-out means 4 as an output synchronizing signal output. In such a way, the image inputs of all of the picture elements can be affected on the image outputs, and the picture quality of the output image can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image processing apparatus for use in facsimiles, electronic copying machines, electronic stencil printing machines, and the like.

2. Description of the Related Art Conventionally, as shown in FIG. 3, a data buffer 3 for latching the image data 1, a thinning means 4 for thinning out the input synchronization signal 2, and a scale control section 6 for controlling the thinning means 4,
The thinning means 4 thins out the input synchronization signal 2 under the control of the output of the scale control section 5, and the thinned out input synchronization signal 2' controls the data buffer 3 and becomes a synchronization ratio cuff.

Image input 1 is thinned out and latched by data buffer 3, and becomes image output 6. Image reduction was performed using this image output 6 and the synchronous ratio cuff, so for example, JP-A-59-1
78863).

Next, this conventional example will be explained based on the timing chart shown in FIG. Figures 4a to 4e show waveforms at points a"-e in Figure 3. In this method, the pixel is determined by the rising edge of the input synchronizing signal 2, and the image at that point is The value of human power 1 becomes the value of that pixel.

Each pixel of the image input 1 is composed of N pits. Therefore, at a in FIG. 4, a, a+1°a+2. ...
... will each take a value from 0 to (2N-1). Now, when trying to thin out the (a+3) pixel of the signal a using the signal C from the scale control unit 6, the signal (b
), (c) are applied to the thinning means 4 to generate a thinning signal d, and using this signal d, the data buffer 3
The signals are then thinned out from signal a to signal e. In other words, the pixel (a+3) is thinned out from the signal e, and the number of pixels is reduced by one at the same time, resulting in a scaling operation.

Problems to be Solved by the Invention In such a conventional configuration, as shown in FIG. In the case of a line portion of a line drawing having a line width close to the pitch, there is a problem in that the line drawing is deleted and the quality of the output image deteriorates.

The present invention solves these problems, and aims to provide an image processing device that can improve the image quality of the output image by reflecting the image input of all pixels in the image output. It is something.

Means for Solving the Problems The image scaling device of the present invention receives an image input representing one pixel as a multi-value and an input synchronization signal for sampling this image input pixel by pixel, and converts the image input into the above-mentioned a first data buffer held in synchronization with an input synchronization signal;
a function generator that generates an output determined by the image input and the first data buffer output; a data selector that selects either the function generator output or the first data buffer 7 output; a scale control unit that outputs a scale control signal with a corresponding frequency of occurrence; a thinning unit that thins out the input/synchronization signal pixel by pixel; and a signal that is controlled by the output of the scale control unit and controls the thinning unit. It consists of a timing adjustment unit that outputs a selection signal that controls the data selector, and a second data buffer that holds the data selector output in synchronization with the thinning unit output, and the second data buffer outputs the output of the second data buffer as an image. The output of the thinning means is used as an output synchronizing signal.

Effect With this configuration, even if the two-sided image input to be deleted is a line part of a line drawing with a line width close to the pixel pitch, that image input will be reflected in the image output as image data that reflects the image input. However, since the image input of all pixels is reflected in the image output, it is possible to improve the image quality of the output image.

Embodiment FIG. 1 is a block diagram of an image reduction apparatus according to an embodiment of the present invention, and FIG. 2 shows a timing adjustment section of each part thereof. In the figure, 3 is a data buffer that latches the image input 1 in synchronization with the input synchronization signal input 2. 4 is a thinning means for thinning out the input synchronization signal 2, 6 is a scale control unit that outputs a scale control signal, and 8 is an image human power 1 and a data buffer 3.
A function generator whose output is a variable input; 9 a data selector which selects and outputs either the output of the function generator 8 or the output of the data buffer 3; 10 a data selector 9 with a signal for controlling the thinning means 4; A timing adjustment section 11 generates a controlling selection signal with predetermined dimming, and a data buffer 11 latches the output of the data selector 9 in synchronization with the output of the thinning means 4.

The operation of the image scaling device configured as described above will be described below. In FIG. 1, when the scale control signal output from the scale control section 6 is at a high level, the output from the timing adjustment section 1o, that is, the signal 1c that controls the thinning means 4 and the selection signal that controls the data selector 9 are combined. When both are at high level, the image input signal 1 is latched into the data buffer 73 by the input synchronization signal 2, and the output f of the data buffer 3 is selected by the data selector 9.

On the other hand, the input synchronization signal 2 is not thinned out by the thinning means 4, and the output i of the data selector 9 is the output d of the thinning means 4.
The output of the data signal (rough 711) is latched in the data signal 11 in synchronization with the data signal 711, and the output of the data signal (rough 711) becomes the image output 6.If there is a low level pulse in the scale control signal of the output j of the scale control section 6, By outputting a low level pulse to the output, that is, the selection signal of the data selector 9, the output q of the function generator 8 which receives the image input 1 and the output f of the data buffer 3, which is the input of the image immediately before and adjacent to the image input 1, is output. is selected by the data selector 9. On the other hand, by outputting a low level ( The output of the data selector 9 is latched in the data buffer 11 in synchronization with the output of the thinning means 4 before being thinned out, and the output of the data buffer 711 becomes the image output 6. Timing. The adjustment unit 10 adjusts and outputs the output taroming of the selection signal that controls the data selector 9 and the signal that controls the thinning unit 4 at the above-mentioned timing. A numerical function generator is configured that outputs the maximum value of two people when the image is a line drawing, and an average value when it is a photographic image. The same effect can be obtained even when the logic function generator is simply configured, or when a plurality of function generators are configured to be switchable.

Next, the embodiment of the present invention shown in FIG. 1 will be specifically described using the waveforms of each part shown in FIG.

Image 1 has pixels (a) each composed of N bits.

(a+1), (a+2), (a+3)... (signal (a)), which is input to the data buffer 3 at the falling edge of the input synchronization signal 2 (signal (b)). , signal (f)
The signal is shifted from the (-) signal as shown below. and signal (a).

For example, the average value of (f) is calculated by the function generator 8 and the signal (
a)+ (a +1), ■ is Tsuneji)+(a+1)...
The result is... On the other hand, when the output of the timing adjustment section 10 is at low level, the signal ((J) is selected, and when the output is at the no level, the signal (f) is selected. (a+3). Then, the signal (i) is thinned out by the data bar 77711 based on the output signal (d) obtained by the thinning means 4, and the signal (e
) is obtained.

In this way, between pixels (a+1) and (a+4),
There is an average value of pixels (a+2) and (a+3). Therefore, conventionally, when scaling down, some pixel information was deleted, causing a problem of deterioration of image quality, but this embodiment does not have such a problem.

In addition to the effects of the invention, the present invention deletes the image input of two adjacent pixels,
By adding the image data of one pixel (for example, the average value) obtained from this two-sided image input to be deleted, the image input of all pixels is reflected in the image output, and the image quality of the output image can be improved. This has the effect of making it possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an image scaling device according to an embodiment of the present invention, FIG. 2 is a waveform diagram of each part of the same block diagram, FIG. 3 is a block diagram showing an image scaling device according to a conventional example, and FIG. 4 are waveform diagrams of various parts of the same block diagram. 3... Data buffer, 4... Thinning means, 6... Scale control unit, 8... Function generator, 9 Mountain... Data selector, 10 ...Opportunity adjustment section, 11...2nd degree data buffer. Name of agent: Patent attorney Toshi Nakao, 1 person, 5-
Finally, the control group a-Function generation breath/l-11 ZLy) Data buffer No. 1 Fig. 2 j ゛

Claims (1)

[Claims] a first data buffer that receives an image input representing one pixel as a multi-value and an input synchronization signal for sampling the image input pixel by pixel, and holds the image input in synchronization with the input synchronization signal; , the above image input and the above first
a function generator that generates an output determined by the data buffer output, a data selector that selects either the function generator output or the first data buffer output, and a scale control unit that controls the frequency of occurrence according to the scale ratio. a thinning means for thinning out the input synchronization signal pixel by pixel, and a timing adjustment section that is controlled by the output of the scale control section and outputs a signal for controlling the thinning means and a selection signal for controlling the data selector. an image scaling device comprising a second data buffer that holds the data selector output in synchronization with the output of the thinning means, the output of the second data buffer as an image output, and the output of the thinning means as an output synchronization signal output. .