JPH04207775A - Image hard copy generating device - Google Patents

Abstract

PURPOSE:To simultaneously generate character data and graphic data by providing a division means for dividing a two-dimensional image into the divisional images of specified size and an enlarging means for enlarging the divisional image which is previously divided by the ratio fv/fs of video signal conversion frequency fv to sampling frequency fs for AD conversion before converting a video signal. CONSTITUTION:The image stored in an image storing part 1 is divided into the proper divisional images and read out by a division and readout control part 2. The divided divisional images are enlarged by the ratio fv/fs of the conversion frequency fv of a video conversion part 4 to the sampling frequency fs of the AD conversion part 5 by an enlargement part 3. Thereafter, it is converted into the video signal by a video conversion part 4 and displayed on a display part 9. At the same time, it is converted into a digital value again by a DA conversion part, and it is stored in an image memory 6 and a hard copy is generated by a printer part 8 under the control of a divided image rearrangement control part 7. The image which is enlarged by the ratio of the frequency of a video conversion clock CKv to an AD sampling clock CKs, that is, twice in an X direction being a video scanning direction is 32b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a two-dimensional image hard copy generation device, and in particular, a two-dimensional image converted into a video signal for displaying degrees is converted into a hard copy by AD conversion again. The present invention relates to a device for generating.

[Prior Art] Conventionally, in this type of image hard copy generation device,
Generally, the maximum operating frequency of a DA converter for converting into a video signal is currently higher than that of an AD converter. Therefore, the conversion frequency for converting to a video signal has been matched to that for AD conversion, or the conversion frequency has been operated at two or different operating frequencies, without taking into account the difference.

[Problem to be solved by the invention] In such a conventional image hard copy generation device.

When the video conversion frequency and the sampling frequency for AD conversion are the same, the video signal band for one display is limited, and there is a problem in that the image quality is limited in terms of displaying high-definition images.

Furthermore, if the video conversion frequency and the frequency for AD conversion are set separately, as mentioned above, the operating frequency of the latter is generally lower, so the image quality of the generated hard copy will be lower than that of the display image. There is a problem with deterioration.

By the way, in order to prevent this deterioration, is there a device that directly sends the stored digital image itself to a printer unit that generates a hard copy? There is a problem in that it is not possible to generate a hard copy of the data and graphic data.

[Means for Solving the Problem] According to the present invention, after converting a stored two-dimensional image into a video signal, the two-dimensional image is sampled at a sampling frequency f5 lower than the video conversion frequency fv and subjected to AD conversion. An image hard copy generation device that generates a hard copy of a dimensional image, comprising a dividing means for dividing the two-dimensional image into partial images of a predetermined size, and a dividing means for dividing the two-dimensional image into partial images of a predetermined size; f
ヮ, an enlargement means for enlarging the sampling frequency f5 for AD conversion by the ratio fv/fs, and a hard copy generation unit for returning the partial image data after AD conversion to the corresponding position of the original image to generate a hard copy. An image hard copy generation device is obtained, characterized in that it has means.

[Example] The present invention will be described with reference to the drawings. FIG. 1 is a block diagram of one embodiment of the present invention. The image stored in the image storage section 1 is divided into appropriate partial images and read out by the division readout control section 2.

The divided partial images are converted by the enlarging unit 3 to the conversion frequency fV of the video conversion unit 4 and the sampling frequency fs of the AD conversion unit 5.
is expanded by the ratio fv/fs.

Thereafter, the video signal is converted into a video signal by the video conversion section 4 and displayed on the display section 9. At the same time, the data is reconverted into a digital value by the DA converter, stored in the control child image memory 6 of the 1-divided image rearrangement control unit 7, and a hard copy is generated by the printer unit 8.

Figure 2 shows an example of the order from division to rearrangement when the original image in the image storage unit 1 is divided into 1/4. The layout is shown.

Next, FIG. 3 shows the generated results when the video signal conversion frequency fv is twice the sampling frequency fs of the AD converter, one in which this difference is not taken into account, and one in which the image is enlarged twice according to the present invention. We will explain the differences between the hard copy images.

FIG. 3(a') shows the conventional case where the difference in frequency is not considered, and the original image 31a is an image in which black and white are repeated for each pixel in the X direction. 32a is an image passing through the video converter 4, and 34a is the conversion clock CK of the video converter 4.
35a is the sampling clock CK of the AD conversion section
It is S. From this figure, CN3 samples only the black part of the image, and the hard copy output becomes all-pixel black as shown in 33a.

FIG. 3(b) shows a case according to an embodiment of the present invention. The original image 31b is also an image that repeats black and white for each pixel in the X direction, and is enlarged in the X direction, which is the video scanning direction, by the ratio of the frequency of the video conversion clock CKv and the AD sampling clock CKs, that is, twice. The resulting image is 32b. From this figure, it can be seen that the AD sampling clock CKs can sample black and white alternately in the same way as the original image, and therefore the hard copy output will be like 33b, and the original image can be faithfully output.

[Effects of the Invention] As described above, according to the present invention, there is no restriction on the bandwidth of the video signal due to the sampling frequency of the AD converter, that is, there is no restriction on the quality of one display image. Also.

Further, the image quality of the hard copy produced by the enlargement does not deteriorate compared to that of the displayed image.

This has the advantage that character data and graphic data to be superimposed for AD converting a display video signal can be generated at the same time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
An example of the order from division to rearrangement when the original image shown in the figure is divided into 1/4, and FIG. 3 shows the difference in output results between the conventional example and the example of the present invention shown in FIG. It is a diagram. 1... Image storage unit, 2... Division readout control unit, 3...
- Enlargement section, 4... Video conversion section, 5... AD conversion section, 6... Image memory, 7... Divided image relocation control section, 8... Blink section, 9... Display Section, 31a...
Original image, 32a...Conventional video conversion output, 33a
. . . Print output of conventional example, 34a . . . Video conversion clock, 35a . . . Sampling clock, 31b
...Original image, 32b...Video conversion output of an embodiment of the present invention, 33b...Print output of an embodiment of the present invention, 34b...Video conversion clock, 35b...Sampling clock. Agent (7783) Patent attorney Noriyasu Ikeda (・)7ζ, □,
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Claims (3)

[Claims] (1) Image hard copy generation that generates a hard copy of the two-dimensional image by converting the stored two-dimensional image into a video signal, sampling it at a sampling frequency f_s lower than the video conversion frequency f_v, and performing AD conversion. In the apparatus, a dividing means divides the two-dimensional image into partial images of a predetermined size, and divides the divided partial images into a video signal conversion frequency f_v and a sampling frequency f_s for AD conversion before video signal conversion. ratio f
An image hard copy generation device comprising an enlargement means for enlarging by _v/f_s and a hard copy generation means for returning partial image data after AD conversion to a corresponding position of the original image to generate a hard copy. . (2) The image hard copy generating apparatus according to claim 1, wherein the enlarging means enlarges only in the scanning direction of the video signal. (3) The image hard copy generating apparatus according to claim 1, wherein the enlarging means employs a simple enlarging method using one nearest point. (4) The image hard copy generating apparatus according to claim 1, wherein the enlarging means uses an interpolation enlarging method using two adjacent points.