JPH02162044A - Picture printer - Google Patents

Abstract

PURPOSE:To print a picture where videos are separated for each field by constituting such that outputs from the A/D converter of a video signal processing part are read for each field, reading picture elements of N/2 lines from the same field and afterward reading picture elements of remaining N/2 lines from another field. CONSTITUTION:Picture elements of one line are read by horizontal scanning line, stored in a line memory part 3, and printed. While a 2nd counter in the video signal processing part 1 is moved by one picture element, these procedures are repeated N/2 times. Then, another field different from the one set previously is set, and a 2nd counter is initialized to repeat these procedures N/2 times. Without providing a picture element memory part, pictures separated by the field are printed. Thus, pictures separated by fields can be printed under the simple arrangement that requires no picture element memory.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image printer for printing video signals.

2. Description of the Related Art Image printers that print video signals are conventionally known. By the way, when conventional image printers separate and print a video screen by field, the screen data to be printed is stored in advance in an image memory unit that can read and write data (hereinafter, randomly accessible) at any address, and It was configured to edit the data in the memory section and print a separate screen.

This will be explained below based on FIG.

The video signal is digitized by the video signal processing unit θ and stored in a randomly accessible image memory unit 7. now,
When a separation instruction for separating images is given from the key operation section 5, the control section 5 gives the separation instruction to the separation processing section 8. The separation processing section 8 edits arbitrary data from the image memory section 7 to create separation data, and transfers the separation data to the printing section 4.
The printer was configured to print a separated image by sending the image to the printer.

Problems to be Solved by the Invention However, the above-mentioned configuration has the problem that the structure is complicated and expensive because it requires an image memory.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image printer having a separate image printing function that can be configured with a simple circuit that does not require an image memory.

Means for Solving the Problems The present invention includes an oscillation circuit that generates a read pixel clock in a preset field, and a sampling pulse that counts the read pixel clock to measure the time from a horizontal synchronization signal and outputs a sampling pulse to the read pixel position. a first counter that generates a preset value, a second counter that updates the value preset in the first counter at a frame or field period and moves the reading pixel position by one pixel, and A video signal processing unit that includes an A/D converter that converts a video signal from A/D, a key operation unit that gives operation instructions, and an A/D converter of the video signal processing unit in accordance with data input from the key operation unit. a control unit that controls the output of the D converter;
It is equipped with a line memory section that stores the output of the control section and a printing section that prints based on the data in the line memory section, and is configured to read the output of the A/D converter of the video signal processing section field by field. Read the pixels for N/2 lines from the field, and read the remaining N pixels from the field next to it.
/2 lines are read to print an image in which the image is separated for each field.

Function The present invention has the following features: 1. With the above-described configuration, one
Read a line's worth of pixels, store them in the line memory section, print one line, then move the second counter of the video signal processing section by one pixel, repeat N/2 times, and then move forward. A field different from the set field is set, a second counter is initialized, and the same process as described above is repeated N/2 times to print separate images for each field without having an image memory section.

Embodiment FIG. 1 is a block diagram of an embodiment of the image printer of the present invention. FIG. 2 shows the video signal processing section of FIG.
32 is an oscillator that generates a reading pixel clock; 32 is an initial position setting means for setting the horizontal position to start reading; 33 is a second counter that moves the reading line by one pixel in the vertical direction of the screen during one frame period; 34; Reference numeral 35 includes a first counter that generates a sampling pulse for each scanning line, and an A/D converter 35 that performs A/D conversion of an input still image video signal.

Further, a is a horizontal synchronizing signal, b is a vertical synchronizing signal, C is a video signal, d is a strobe signal, and e is a start signal. 1
When sampling the screen into M pixels vertically and N pixels horizontally as shown in FIG. 3(a), the oscillator 31 shown in FIG. When the start signal e is given, the second counter 33
presets the horizontal initial position data output by the initial position setting means 32. The first counter 34 presets the output of the second counter 33 every time the horizontal synchronization signal is input, and generates a strobe signal when the pixel clock output from the oscillator 31 reaches the preset number of pulses.

The pixel data obtained by A/D converting the video signal by the A/D converter 35 is stored in the register of the line memory shown in FIG. 3(b) as R(0).
When the writing from R (M-1) is completed, the printing unit 4 prints one line. second counter 3
3 is set to count up by 1 for each odd field by a vertical synchronizing signal, and by repeating this from the position i=0 to 1=N-1, one screen can be printed.

Next, when separating by field, when the start signal e is applied, the second counter 33 presets the horizontal initial position data output by the initial position setting means 32. The first counter 34 presets the output of the second counter 33 every time the horizontal synchronization signal is input, and the oscillator 31 generates a strobe signal when the output pixel clock reaches the preset number of pulses. Pixel data AD(j) obtained by A/D converting the video signal by the A/D converter 35 is written into the register R(j) of the line memory shown in FIG. R (M-1) of line memory after waiting for strobe signals
When writing is completed, the printing unit 4 prints one line. The second counter 33 is set to start counting up every odd field by the vertical synchronizing signal,
This is repeated from i=N/4 to i=3*N/4-1.

Next, the second counter 33 is set to count up every even field by the vertical synchronization signal, and by repeating this from i=N/4 to i=3*N/4-1, the fields are separated. Images can be printed.

A flowchart of the main parts of the control section 2 will be explained using FIG. 5. When the print key 7 is input with the separation key 6 of the key operation unit 5 set in advance, the process moves from step 10 to step 11, and the count up of the second counter 33 is set to an odd number field. After initializing the count in steps 12 and 13, step 14 waits for a strobe signal from the video signal processing section 1, and when the strobe signal is input, the A/D output data of the video signal processing section 1 is transferred to the line memory. 3 to register R(j) (step 15), and when writing for one line is completed (
In step 16), one line is printed in step 17, and the process returns to step 13 to repeat for 172 screens.

Next, in step 20, the count up of the second counter 33 is set to an even field, and the process returns to step 12, where the process is repeated for 1/2 screen, thereby printing images separated by field.

In this embodiment, the screen portion of N/4 to 3N'/4 is printed, but the invention is not limited to this, and a screen portion slightly shifted from the center may be printed.

Effects of the Invention As described above, according to the present invention, images separated by field can be printed with a simple configuration that does not require an image memory, which is extremely useful in practice.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an image printer according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a video signal processing section, FIG. 3(a) is a plan view showing an example of screen sampling, and FIG. FIG. 4 is a separation state diagram showing an example of separation, FIG. 5 is a flowchart of the main part of separation control, and FIG. 6 is a block diagram of a conventional image printer. 1... Video signal processing section, 2... Control section, 3...
- Line memory section, 4... Printing section, 5... Key operation section, 31... Oscillator, 32... Initial position setting means, 33... Second counter, 34...
- First counter, 35... A/D converter. Name of agent: Patent attorney Shigetaka Awano

Claims (1)

[Claims] an oscillator circuit that generates a read pixel clock, a first counter that counts the read pixel clock to measure time from a horizontal synchronization signal and generates a sampling pulse at a read pixel position, and presets the first counter. A second counter that updates the value at a frame or field period and moves the reading pixel position by one pixel, and an A/D converter that converts the video signal from analog to digital using the output pulse of the first counter. a key operation section that gives operation instructions; and a key operation section that provides an A/
It is equipped with a control section that controls the output of the D converter, a line memory section that stores the output of the control section, and a printing section that prints based on the data of the line memory section. The screen is constructed by reading the output of the A/D converter of the video signal processing section field by field, reading pixels for N/2 lines from the same field, and then reading pixels from other fields for the remaining N/2 lines. An image printer that prints an image in which images are separated for each field by reading the image.