JPS60125086A - Recording device - Google Patents

Abstract

PURPOSE:To attain picture recording of high quality by providing a control means which interpolates a picture signal of a thinned-out raster with a picture signal of the last raster and records it in a recording device which records a picture signal obtained by thinning out one input screen intervals of one raster through a recording part. CONSTITUTION:A video signal is inputted on interlacing basis through an interface 2. Picture data of one screen is stored in a memory 3 with a control signal 1. When all data are stored, a controller 1 reads the data out by using counters 7 and 8 and starts recording operation. Namely, the data are read out of the memory 3, and when the reading operation is completed, picture data of one raster is stored in a buffer memory 4. The recording data stored in the buffer memory 4 is recorded on recording paper by one raster. Then picture data of one raster is recorded by two lines continuously on recording paper on a platen 9. Thus, the data is read out of the memory 3 and one raster is recorded on the recording paper by every two lines to interpolate data on an interlaced raster with dataon the last raster, so a display picture is recorded on the recording paper with high quality at a ratio similar to that of the CRT screen.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a recording device, and more particularly, to
The present invention relates to a recording device in which a recording unit records an image signal obtained by thinning out a screen every one raster.

[Prior Art] Conventionally, CRTs have been used as part of computer systems, etc.
2. Description of the Related Art A recording device called a so-called hard copy device is known that directly records a screen displayed on a recording medium using various methods such as inkjet or thermal recording. Many of these conventional recording apparatuses record image data of a screen displayed on a CRT as is.

On the other hand, video control in the host system requires three times as much memory space as a monochrome screen, especially for a color screen, so in reality, half of the total number of rusks on one screen is used for each of the colors red, green, and blue. In many cases, only the memory area corresponding to the Therefore, in such a system, the CRT screen displays only every other raster, so if you connect the above recording device and record it, there will be unrecorded parts every other raster, making it difficult to view. This method has the disadvantage that the resulting recording results in poor image quality.

[Purpose] The present invention has been made in view of the above-mentioned drawbacks of the conventional technology, and is capable of achieving high quality even when image data of every other raster is input using a simple and inexpensive configuration without requiring any modification to the host side device. The purpose of the present invention is to provide a recording device that can record images of a high quality.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

FIG. 1 shows the circuit configuration of the recording apparatus of the present invention.

In FIG. 1, the reference numeral 1 indicates a microprocessor-based control device 1, which receives video signals from a host device via an interface 2 and receives a data bus D.
It is stored at a predetermined address in the memory 3 by random access memory via the BI.

The memory 3 is connected to the control device 1 by a control line and a data bus DB, 2, and data is exchanged via the data bus DB2.

Furthermore, a buffer memory 4 is connected to the control device 1 via a control line and a data bus DB3. This buffer memory 4 is assumed to be capable of storing image data for 1/2 minutes.

Further, the control device 1 is connected to a counter 7 and a counter 8 for data read control, which will be described later. These counters may be configured in software.

Furthermore, a recording section consisting of a recording head 5 and a drive device 6 is connected to the control device 1 . The print head 5 is composed of, for example, an inkjet print head, and print data is input to the print head 5 via a data bus DB4. The drive device 6 drives the recording paper, the recording head 5, etc. during a recording operation. FIG. 2 briefly shows the configuration of the recording section.

The recording head 5 performs recording on the recording paper on the platen 9 in the main scanning direction while moving left and right along the platen 9, that is, along the direction P by the drive of the drive device 6. When recording of one line is completed, the drive device 6 rotates the platen 9 in the Q direction to feed the recording paper, performs sub-scanning, returns the recording head 5 to the home position, and moves on to recording the next line. . The details of this recording control are well known and will not be described in detail here.

Next, the operation of the above configuration will be explained in detail with reference to the flowcharts of FIGS. 2, 3, and 4.

First, a screen consisting of nXm pixels in the vertical and horizontal directions is displayed on a CRT (not shown) on the host side, and this video signal is input via the interface 2 in an interlaced manner.

The control device 1 stores this image data in memory cells having upper addresses 0 to n/2-1 and lower addresses θ to m-1 of the memory 3, as shown in FIG. Address specification is performed using an index register, a pointer set in memory, etc., as is well known.

First, when a vertical synchronization signal is input to the interface 2 in step S1 of FIG. 4, both the upper and lower addresses are reset in step S2, and each time data for one pixel is written (step 33). The lower address is incremented (step S4). l When raster writing is completed in step S6, the upper address is incremented in steps S8 and S9, the lower address is reset, and the writing of the next raster is started.The next vertical synchronization signal is sent to the interface 2 in step S7. The image data is stored in the memory 3 by repeating steps S3 to S6 until the image data is input.

In the case of interlaced signals, as is well known, the thinned-out screen and the display screen are transferred alternately from the host side, so the control device 1 accumulates all the data stored in the memory 3 in step S5. Taking advantage of the fact that the value is 1 in the case of a thinned out screen, that is, a full self-view, processing is performed to determine whether the transferred screen is a thinned out screen in step SIO after inputting the vertical synchronization signal. If the transferred screen is a thinned out screen, the process returns to step S2 and the next screen is stored in the memory 3 again.

As described above, one screen worth of image data is stored in the memory 3. When the data is finished, the control device 1 moves on to reading and recording the data using the counter 7.8.

The counters 7.8 correspond to the above-mentioned upper and lower addresses, respectively, and the control device 1 first instructs the counters 7.8 in step 311 before reading data.
8 will be reset together.

Next, in step 312, the control device 1 reads the data in the memory 3 with the counter 7 as the upper address and the counter 8 as the lower address, and stores this in the buffer memory 4 using the stellar 7'SL3.
Repeat incrementing step 315
When the counter 8 reaches the predetermined value m, the reading ends. In this way, 1977 worth of image data is stored in the buffer memory 4.

The recording data stored in the buffer memory 4 is recorded as follows.

First, in step 316, the control device 1 controls the buffer memory 4.
One piece of data is read from the beginning of , and in step 317 it is sent to the recording head 5 to be recorded. Subsequently, in step 318, the control device 1 sends a control signal to the drive device 6 to advance the recording head 5 in the direction P in FIG. 3 to the next recording position. By repeating the above steps, when 1977 minutes of recording is completed in step 319, a control signal is sent to the drive device 6 in step 320 to return the recording head 5 to the home position, and at the same time, in step 321, the platen 9 is rotated by one distance in the Q direction.

Subsequently, the same operations as steps 316 to 321 are repeated to record the same one rask worth of data in the buffer memory 4 onto the recording paper. This control calculates the count value of a counter (not shown) for counting the number of recording rasters in step 322.
This is done by checking. Therefore, up to this point, two consecutive lines of the same 1977 worth of image data have been recorded on the recording paper on the platen 9.

Next, the control device 1 increments the counter 7 by 1 in step 323, resets the counter 8 in step S25, returns to step 312, reads the next raster into the buffer memory 4, and records two lines on the recording paper. .

When the counter 7 is incremented, its contents are checked in step 324 to determine whether it has reached n/2.

The above operations are repeated one after another to read out the data in the memory 3, and one rask is recorded on the recording paper two lines at a time. In the above-mentioned operation, when the contents are incremented by a carantuff, reading and recording of data is terminated if the content reaches a predetermined value n/2. In the above recording operation, by recording l rusks on the recording paper in two lines each,
Since the interlaced raster is complemented with the data of the previous raster, it is possible to record a high-quality display image on recording paper at a ratio similar to that of a CRT screen.

The control procedure of the control device 1 described above can be recorded as a program in a ROM etc. As shown above, the present invention has the advantage that it can be implemented easily and inexpensively by almost only changing the software. .

A switch means may be provided for the above operation mode, and the operation mode may be switched between an operation mode in which video data is recorded as is, as in the conventional case. Alternatively, the operation mode can be switched by control on the host side.

In the above embodiments, the recording head is exemplified as one that performs one-way recording, but it can also be configured to perform reciprocating recording. In that case, on the return trip, the counter 8 is decremented and the
Data may be recorded starting from the end of the buffer memory 4.

Further, in the above embodiments, an inkjet recording device is used as an example of the recording section, but various recording methods can be adopted for the recording section, such as a wire tod recording device, a thermal recording device, and a thermal transfer printer.

[Effect] As is clear from the above description, according to the present invention, in a recording device in which a recording unit records an image signal that is thinned out every other raster from one input screen, the thinned raster The present invention employs a configuration in which a control means is provided to complement the image signal of the previous raster with the image signal of the immediately preceding raster and record it in the recording section, thereby providing an excellent recording device that can easily and inexpensively record high-quality images. can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the circuit configuration of the recording device of the present invention, FIG. 2 is a top view showing the configuration of the recording section of the recording device of the present invention, and FIG. 3 is a diagram showing the memory storage operation in the recording device of the present invention. The explanatory diagram shown in FIG. 4 is a flow chart diagram showing the control procedure in the present invention. l...Control device 2...Interface 3...
Memory 4... Buffer memory 5... Recording head
6... Drive device 7... Counter 8... Counter Figure 1 tfs 2 Figure 2; e (Figure 3

Claims (1)

[Claims] In a recording device that records input image signals thinned out every l raster on one screen by a recording section, the input image signal of one thinned raster is supplemented with the input image signal of the immediately preceding raster and recorded in the recording section. A recording device having a feature 4'1 of having a control means for controlling