JPS628221A - Image signal processor - Google Patents

Abstract

PURPOSE:To output a pseudo gradation signal which is easy to discriminate by a simple constitution by detecting the change points of the color of the main-scanning and subscanning directions of a multicolor signal and generating a contour signal, and synthesizing it with the output signal of a gradation pattern generating means and switching and outputting the composite signal. CONSTITUTION:A horizontal decision means 130 inputs the R, G, and B signals of display memories 101 and detects and outputs change points of color in the main scanning direction. A vertical decision means 140, on the other hand, inputs the R, G, and B signals and detects and outputs change points of color in the subscanning direction. The main-scanning direction change point signal and subscanning directional change point signal are synthesized by the OR circuit 119 of a synthesis switching means 150. Further, the synthesizing signal is synthesized by an OR circuit 120 with the gradation pattern signal for pseudo gradation printing which is generated by a gradation pattern generating circuit 103. Then, the gradation pattern signal and a multicolor change point signal or multicolor change point synthesizing signal are switched and outputted through the switch 121 of the synthesis switching means 150.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image signal processing device that stores color information in a memory and converts information displayed in multiple colors on a CRT into an image signal used in a printing device or the like.

2. Description of the Related Art Conventionally, in a device having a display memory and performing multicolor display on a CRT, when printing multicolor display contents on a black and white binary printer, one pixel of the display memory is assigned to multiple pixels of the printing device, There is a method of converting color information into turns and displaying it as a pseudo gradation. Change the display memory configuration to red (R
), green (G), and blue (B) (hereinafter referred to as R, G, and B).
FIG. 4 shows an example in which nine pixels, 3 pixels in the main scanning direction (horizontal) of the printing device x 3 pixels in the sub-scanning direction (vertical), are allocated to one pixel of the display memory.

Since the display memory has one layer each for R, G, and B, the number of displayed colors is eight (R, G, B, and mixed colors thereof).

Referring to FIG. 4, 401 is one pixel of the display memory,
The pattern is converted into a 9-dot pattern shown in FIG. 4 according to the color from black (K) to white (W) and printed. The nine dots of the conversion pattern all have different ratios of white and black, and when printed at high density, they are distinguished by gradation, making it possible to distinguish the range of each color.

Problems to be Solved by the Invention However, in the conventional method, the identification method is based only on the difference in gradation, and the information contained in the colored information on the entire display memory and the information contained in the color of the characters etc. in the figure is printed. In this case, it is difficult to distinguish between gradation differences and color differences because they do not change.

The present invention has been made in view of the above, and an object of the present invention is to provide an image signal processing device that has a simple configuration and can output a pseudo gradation signal that is easy to distinguish.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a multi-layer display memory means that enables multi-color display and a gradation system for performing pseudo gradation printing of multi-color signals output from the display memory means. For the gradation pattern generation means that generates the gradation pattern, the display memory means has horizontal discriminating means that detects the change point in the main scanning direction (horizontal direction) of the output signal, and vertical discrimination means that detects the change point in the sub-scanning direction (vertical direction). The discriminating means, the horizontal discriminating means, and the vertical discriminating means are combined,
A switching synthesis means that can be combined with the gradation pattern generation means or switched independently is added to obtain a pseudo gradation signal that emphasizes the changing points of the multicolor signal from the switching synthesis means.

According to the above-described configuration, the present invention separately detects the color change points in the main scanning direction and the sub-scanning direction in the multicolor signal output from the display memory means by the horizontal discrimination means and the vertical discrimination means, and detects the color change points in the horizontal scanning direction and the horizontal discrimination by the switching composition means. , the vertical change point signals are synthesized to create a contour signal for each color, which is synthesized with the output signal of the gradation pattern generation means by a switching synthesis means, or outputted by switching alone to generate a pseudo gradation signal with an emphasis on the contour, pseudo gradation. It outputs a signal or a contour signal.

Embodiment FIG. 1 is a block diagram showing an image signal processing apparatus according to an embodiment of the present invention. In this embodiment, the configuration of the display memory is R, G.
, B, one pixel of the display memory is printed as 9 pixels (
An example of outputting for printing in 3 pixels horizontally x 3 pixels vertically is shown below. Note that this output may be configured to be displayed on a black and white CRT display or the like.

In FIG. 1, 101 is a display memory R, G.

B each consists of one layer. Timing generation circuit 10
2 generates timing signals for display and printing. The gradation pattern generation circuit 103 generates a dither pattern for pseudo gradation printing. 130 is horizontal discrimination means for detecting the point of change in color in the main scanning direction;
Delay circuits 104 to 1o6 that individually delay the B signal by one print pixel of R, G, and B, and the input R, G, and B signals and the delays R,
G.

Exclusive OR circuits 107 to 10 for comparing and determining B signals
9. It is constituted by an OR circuit that combines the results of comparison and determination of R, G, and B signals and outputs it as a change point signal in the main scanning direction of the multicolor signal.

140 is an exclusive OR circuit 114 to 116° R, G, B signals that compares and judges vertical input R, G, B signals and delayed R, G, B signals to detect color change points in the sub-transmission direction. An OR circuit 117. synthesizes the determination results and outputs the result as a change point signal in the sub-scanning direction of the multicolor signal. It is composed of an AND circuit 118 that controls to output a change point signal in the sub-scanning direction only to the first line of three printing lines for printing one display line.

Reference numeral 150 denotes a synthesis switching means, and 119 is an OR circuit for synthesizing the main scanning direction change point signal and the sub-scanning direction change point signal. tone pattern.

It consists of a switch 121 that switches between a multicolor change point signal or gradation pattern and a multicolor change point composite signal.

Among the delay circuits and exclusive OR circuits of the horizontal discriminating means and vertical discriminating means, the delay circuits 104 and 111° The exclusive OR circuits 107 and 114 transmit the R signal to the delay circuits 106 and 1
12. The exclusive OR circuit 108, 115 sends the G signal to the delay circuits 106, 113, . Exclusive OR circuit 109, 116
is a circuit that processes the B signal. This will be explained below using a specific example. In FIG. 2, 201 is a display example of 10 pixels in the main scanning direction and 4 pixels in the sub-scanning direction of the display memory 101.

Multicolor change point detection will be explained using the first line in the main scanning direction and the first and second lines in the sub-scanning direction. 2
02 shows the detection waveform of the main scanning direction change point, R,
G, B input signals a, b, c and signals d, e, f delayed by one printing pixel are individually exclusive ORed to output R, G, B change point q+h+' and synthesized. Output a changing point signal j. Reference numeral 203 shows a detected waveform at a change point in the sub-scanning direction, and is the R, G, and H input signal k of the second line.

1, m and the R, G, B signals of the 1st line are displayed. Signals n, o, and p delayed by one line are individually exclusive-ORed to output the R, G, and H change point q+ rrB. A composite change point signal t is output. By combining the main scanning direction change point signal j and the sub-scanning direction change point signal t, a contour signal can be created, and by combining it with the gradation pattern, a gradation pattern that emphasizes the change point can be created.

FIG. 3 shows an example of displaying or printing based on the signal obtained by switching the switch 121 of FIG. 1 using the display example 201 of FIG. 2. In FIG. 3, 301 is switch 1
Example of gradation pattern printing where 21 is connected to the terminal (power, 302
303 is an example of printing a gradation pattern with an emphasis on the outline where the switch 121 is connected to the terminal (A), and 303 is an example of printing an outline where the switch 121 is connected to the terminal (A).

Effects of the Invention As described above, according to the present invention, it is possible to display the content of a multicolor display as an easily readable contour-enhanced gradation plane or to obtain a signal for contour display with an extremely simple circuit configuration. I can do it. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an image signal processing device according to an embodiment of the present invention, FIG. 2 is a correspondence diagram showing the relationship between an image and a timing waveform in the embodiment, and FIG. 3 is a diagram showing the relationship between an image and a timing waveform in the embodiment. A screen diagram showing an image, and FIG. 4 is a pattern diagram showing a conventional pseudo gradation printing pattern. 1o1...Display memory, 103...Gradation pattern generation circuit, 130...Horizontal discrimination means, 140...Vertical discrimination means, 150...・
-Synthesis switching means. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 4 Figure 4&<(n cyan (C1 responsibility (a)
Wl-1 convex A-

Claims (1)

[Claims] a multilayer display memory means that enables multicolor display; a gradation pattern generation means that generates a gradation pattern for displaying a pseudo gradation of the multicolor signal output from the display memory means; and an output signal from the display memory means. horizontal discrimination means for detecting a change point in the main scanning direction; vertical discrimination means for detecting a change point in the sub-scanning direction; and output signals of the horizontal discrimination means, the vertical discrimination means, and the gradation pattern generation means are switched or a switching and synthesizing means for synthesizing, and the switching and synthesizing means switches or synthesizes the output signals of the horizontal discriminating means, the vertical discriminating means, and the gradation pattern generating means, thereby generating the pseudo gradation signal and the multicolor signal. Pseudo gradation signal that emphasizes changing points,
Alternatively, an image signal processing device characterized in that the multicolor signal is converted into a change point signal.