JPH01316086A - Crt color video printer - Google Patents

Abstract

PURPOSE:To appropriately adjust the color balance of the title printer with a simple constitution by using a belt-like red, green, and blue filters having widths which are inversely proportional to the spectral sensitivity of a photosensitive material and arranging the filters in a line on the surface of a black-and- white CRT, and then, simultaneously exposing the filters in a line. CONSTITUTION:In a CRT color printer which prints a color picture on a photosensitive material by using a black-and-white CRT 10, a belt-like red, green, and blue filters 15, 16, and 17 having widths which are inversely proportional to the spectral sensitivity of the photosensitive material are used and, by arranging the filters 15-17 on a filter plate 18 on the surface of the CRT 10, a red light, green light, and blue light emitting areas are formed. Then the picture data of one-line quantity of each of the three color pictures of the color picture are read out and displayed at each corresponding light emitting area in a state where the picture data are extended in the width direction so as to form the images of the three colors on the photosensitive material in a line. Thus the images are simultaneously exposed in a line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a CRT color video printer, and in particular,
The present invention relates to a CRT color video printer that performs simultaneous line exposure of three colors using a black and white CRT and color filters.

[Conventional technology]

Black and white CRT to record high quality color images,
A CRT color video printer using three color filters of red, green, and blue is known. In such an apparatus, color printing is generally performed by sequential exposure of three color planes. However, in the case of the three-color plane sequential exposure, since it is a surface exposure, exposure is performed frame by frame, and there is a problem in that it is difficult to expose a long image like a continuous banner.

In contrast, a three-tree flat CRT emits red, green, and blue light.
For example, a CRT such as the Triniscope system displays each color signal image using a CRT, and images these images in a line on a photosensitive material using an optical system to perform three-color simultaneous line exposure.
Color video printers are also available.

(Problems to be Solved by the Invention) However, the Triniscope type video printer described above uses a dedicated flat CRT and requires three CRTs, making the device configuration complex and manufacturing costs high. The problem is that it gets expensive.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a CRT color video printer capable of simultaneous line exposure of three colors using a monochrome CRT.

[Means to solve the problem]

In order to achieve the above object, the present invention uses band-shaped red, green, and blue filters whose widths are inversely proportional to the spectral sensitivity of a photosensitive material, and arranges these color filters in rows on the surface of a monochrome CRT. , a red light emitting area, a green light emitting area, and a blue light emitting area are formed, one line of image data for each of the three color images of the color image is read out, and one line of image data for each of these colors is generated for each corresponding light emitting area. The data is enlarged and displayed in the width direction, and these band-shaped areas are imaged in a line on the photosensitive material to perform three-color simultaneous line exposure.

In addition to adjustment according to the spectral sensitivity of the photosensitive material, when printing photographic images such as negative film, when adjusting to correct the color balance of the photographic image, it is necessary to adjust the number of light emitted from the scanning lines in each filter. It is preferable to increase or decrease the amount. Further, it is preferable that each color filter is arranged in a row in a direction perpendicular to the scanning line of a monochrome CRT.

[Effect]

After the color and gradation of the input color image are corrected, one line of image data for each of the three color images of this color image is read out, and each corresponding light area = 3 - These colors are read out for each light area. The image data for each line is enlarged and displayed in the width direction. This allows one of the video images to
A line of three-color images is displayed on a single CRT screen, separated by color and enlarged into strips.

After the black and white CRT image passes through a filter, it is formed into a linear image on a photosensitive material in the scanning line direction by an optical system and exposed. This exposure is performed using strip-shaped red, green, and blue filters whose widths are inversely proportional to the spectral sensitivity of the photosensitive material, so that an appropriate amount of exposure for one line can be obtained depending on the spectral sensitivity of the photosensitive material. Simultaneous color line exposure becomes possible. Thereafter, in the same manner, the three color images are simultaneously exposed on the light-sensitive material one line at a time. Since the three colors are exposed simultaneously in this manner, the video image can be continuously exposed to the light-sensitive material.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In FIG. 1 showing a CRT color video printer processor, a video image input device 1 is used for reproducing a color video signal recorded on a videotape or video floppy, for example, or a color television camera, or a device for improving resolution. A real-time color video signal captured by a combination of a black-and-white television camera and a three-color filter is input. Furthermore, this video image input device 1 separates the color video signal into red, green, and blue video signals, and converts these into digital signals by A/D conversion. This digitally converted video signal for one frame is subjected to image processing such as color correction, gradation correction, or positive/negative inversion in the image processing section 2, and the video signals of the three colors of the negative image are processed for each frame. The data is written to memories 3a to 3C.

When using inverted color paper instead of normal color paper as a photosensitive material for printing video images, positive/negative inversion is not performed and the input positive image video signal is stored in each frame memory 3a to 3C. write to.

The three-color video signals in each of the frame memories 3a to 3C are read line by line in response to a read command from the controller 4, and written into the frame memory 5 for line emission. This writing is performed so that image data for one line of each color becomes the same information in the width direction in each color area divided into three areas with a width equal to the inverse ratio of the spectral sensitivity of the photosensitive material. Therefore, one line of a three-color image is
The colors are classified into three colors according to the spectral sensitivity of the photosensitive material and written into the frame memory 5.

The video signal in the frame memory 5 passes through a switching circuit 6 and then is converted into an analog signal by a D/A converter 7. The CRT drive circuit 8 drives the monochrome CRTIO based on this video signal.

A scanning line number setting means 11 is connected to the switching circuit 6 . The scanning line number setting means 11 sets the number of light emitting lines of the number of scanning lines in the light emitting area of each color, which will be described later, based on the correction signal from the color balance correction key 12.
To properly correct the color balance of negative film, etc.

On the screen of the monochrome CRTIO, a red filter 15, a blue filter 16,
A filter plate 18 on which green filters 17 are arranged in rows is arranged. The widths WR, W, . . . W of each of these filters 15 to 17 in the direction orthogonal to the CRT scanning line are distributed so as to be an inverse ratio of the spectral sensitivity of the photosensitive material. for example,
When the spectral sensitivity of the photosensitive material is R:G:B=1:3:8, the width of each filter 15 to 17 is WR:WG:W.
The ratio of B is 8:3:1. These filters 1
5 to 17 form a red light emitting area, a green light emitting area, and a blue light emitting area. The filter plate 18 is made by pasting or directly layering red, green, and blue filters 15 to 17 on a transparent glass plate or plastic sheet. Furthermore, instead of such a filter plate 18, filters may be layered on the surface of the monochrome CRT 10.

Above the black and white CRT 1'0 facing the filter plate 18,
A photosensitive material such as color paper 20 is arranged,
The black and white CRTL, O image that has passed through the filter plate 18 is
A linear image is formed on the color paper 20 by the lens 21 and the cylindrical lens 22 . Note that the reference numeral 23 in the figure indicates a mask having a slit-shaped opening.

The lens 21 is for changing the magnification of the image on the black and white CRT 10 in the scanning line direction (X direction in the figure), and the cylindrical lens 22 is for condensing the image on the black and white CRTIO in a line shape in the scanning line direction. belongs to. Note that in place of the lens 21, another cylindrical lens arranged perpendicular to the cylindrical lens 22 may be used.

The color paper 20 wound into a roll is pulled out line by line by a pair of pull-out rollers 24 after exposure of one line. The pull-out roller 24 is driven by a pulse motor 25.
This pulse motor 25 is rotated by a driver 26.
It is controlled by the controller 4 via. Note that the reference numeral 2.7 in the figure indicates a cutter that cuts the exposed color paper 20 frame by frame or by a predetermined number of frames. Also, 28
indicates a development processing section that develops the exposed photosensitive material.

Next, the operation of the CRT color video printer processor having the above configuration will be explained. The three color frame memories 3a to 3c are inputted by the video image input device l, and are input to the image processing circuit 2.
A video signal of a three-color negative image that has been image-processed is stored. First, when a print key (not shown) is turned on, the controller 4 takes out one line worth of video signals of the three-color negative image from the frame memories 3a to 3c, and
The red video signal for one line is used as image information on the scanning line of the C/RT' screen where the red filter 7 is located, and the green video signal for one line is used as the image information on the scanning line of the C/R7 screen where the green filter 8 is located. image information, and one line of blue video signal to the CR where the blue filter 9 is located.
This video signal is written into the frame memory 5 for one line emission as image information on the scanning line of the T screen. The video signal in frame memory 5 is converted into an analog signal by D/A converter 7 and output to CRT drive circuit 8. For images that require color balance adjustment,
A correction signal is input by the color balance correction key 12, and based on this, the scanning line number setting circuit 11 calculates the number of scanning line emission lines in each light emitting area according to the correction signal, and outputs it to the switching circuit 6. . The switching circuit 6 is ON/OFF controlled by a scanning line number setting circuit 11.
Only video signals on a set number of scanning lines are passed.

The CRT drive circuit 8 controls the light emission of the monochrome CRTIO based on the video signal from the D/A converter 7. This black-and-white CRTIO displays each scanning line of the part of the screen where the red filter 15 is located in the same 1-line image, so 1
The red image corresponding to the line is displayed expanded in the width direction in a band shape. Similarly, each scanning line in the green filter 16 is displayed in one line of the green image, and the blue filter 1
Each scanning line in 7 is also displayed in one line of the blue image. Therefore, on the monochrome CRTIO, a three-color image for one line of the video image is expanded into a band and displayed. At this time, if the color balance is adjusted using the color balance correction key 12, the number of light emitting lights of the scanning line in each light emitting area will be changed from the standard number of light emitting lights to the corrected number of light emitting lights, as shown in FIG. The number of light emitting lights is subtracted as NR, N,, NB,
The amount of light emitted from each light emitting area is adjusted.

The CRT display screen driven in this way is
1 and the cylindrical lens 22, the light is focused in a direction perpendicular to the scanning line of the CRTIO and printed on the color paper 20.
An image is formed in a line on the top, and three-color simultaneous line exposure is performed.

After line exposure has been performed for an appropriate number of frames, the controller 4 sends a drive signal to the driver 26, and the pull-out roller 2
4, the color paper 20 is transported by one line of exposure. At the same time, the next line of three-color images read from the frame memories 3a to 3c is written into the frame memory 5, and three-color simultaneous line exposure is performed for an appropriate number of frames as described above.

In this way, line exposure is performed sequentially, and when the exposure of the I frame or a predetermined sternum is completed, the cutter 27 is activated to selectively cut off the exposed portion.

The separated short pieces of color paper are subjected to photographic processing in a developing-N-image processing section 28, and then discharged onto a tray (not shown).

When using color papers with different spectral sensitivities, the filter plate is replaced with a filter plate having a width that is inversely proportional to the spectral sensitivity of the color paper. Furthermore, in accordance with this replacement, the classification of each light emitting area is also changed in the same way.

Further, in the above embodiment, in addition to the video printer that performs line exposure in three colors simultaneously, the CRT color video printer processor is equipped with a development processing section that develops the exposed photosensitive material. Not limited (
, it is also possible to use a video printer omitting the development processing section.

Further, in the above embodiment, the strip-shaped filters of each color are arranged in a row in the direction perpendicular to the scanning line of the monochrome CRT, but the present invention is not limited to this, and the filters of each color can be arranged in a row in the direction of the scanning line. It can also be used as a thing. In this case, image data for one line of the three-color image is enlarged and displayed in the direction in which each filter is arranged in correspondence with the light emitting area of these filters.

〔Effect of the invention〕

As explained above, according to the present invention, band-shaped red, green, and blue filters having widths inversely proportional to the spectral sensitivity of the photosensitive material are used, and these color filters are arranged in rows on the surface of a black and white CRT. to form a red light-emitting area, a green light-emitting area, and a blue light-emitting area, read out one line of image data for each of the three color images, and read out one line of image data for each of these colors for each corresponding light emitting area. The image data is enlarged in the width direction, and these band-shaped areas are imaged in lines on the photosensitive material to perform three-color simultaneous line exposure.
With RT, the configuration can be simplified and simultaneous line exposure of three colors can be performed, and video images can be printed continuously like a banner.

Furthermore, because the three-color simultaneous exposure is used, there is no need to sequentially insert filters into the printing optical path as in the three-color sequential exposure, and a filter switching device etc. can be omitted, simplifying the configuration. be able to. Furthermore, a mechanical shutter can be omitted, simplifying the structure and enabling high-speed exposure.

Further, since the color balance is adjusted by changing the number of scanning lines emitted in each light emitting area, the configuration can be simplified and the color balance can be easily adjusted appropriately.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram illustrating a CRT color video printer processor embodying the present invention. FIG. 2 is an explanatory diagram showing an example of a CRT screen in the same embodiment. 1... Video image input device 2... Image processing circuits 3a to 3c... Frame memory 4... Controller 5... Frame memory 6... Switching circuit 7... D/A converter 8 ...CRT drive circuit 10...Black and white CRT 11...Scanning line number setting circuit 12...Color balance correction key 15...Red filter 16...Green filter 17...Blue filter 18... - Filter plate 20... Color paper - (photosensitive material) 21... Lens 22... Cylindrical lens 23... Mask. ′

Claims (3)

[Claims] (1) In a CRT color video printer that uses a monochrome CRT to print color images onto a photosensitive material, band-shaped red, green, and blue filters whose widths are inversely proportional to the spectral sensitivity of the photosensitive material are used, and these color filters are black and white C
They are arranged in rows on the surface of the RT to form a red light emitting area, a green light emitting area, and a blue light emitting area. One line of image data for each of the three color images is read out, and for each corresponding light emitting area, The image data for one line of each color is enlarged and displayed in the width direction, and these band-shaped areas are imaged in a line shape on the photosensitive material to perform simultaneous line exposure of three colors. CRT color video printer. (2) The CRT color video printer according to claim 1, wherein the color balance adjustment is performed by increasing or decreasing the light emission width within each light emission area. (3) A CRT color video printer according to claim 1 or 2, wherein the band-shaped color filters are arranged in a row in a direction perpendicular to a scanning line of a monochrome CRT.