JPS59103493A - Color picture reproducing device - Google Patents

Abstract

PURPOSE:To reduce the transmission time by providing a circuit using binary information of color ink to a color picture signal transmitted and received between an input section and a recording section of a color picture reproducing device. CONSTITUTION:A light source 10b of an input section 10 irradiates an original picture 10a, a spectroscope 20 separates R, G, B three color components weighted by a desirable spectral characteristic and the components are inputted to a color converter 30 as each digital signal. A color converting device 30 converts recording information into binary information of cyan, magenta, yellow and black ink based on the multi-value information of RGB, and a data of print image is stored in a register 40. Further, a redundancy suppressing coder 50 applies the data compressing method such as run length coding and modified Haffmann coding to the print image data stored in the register 40, a transmission section 60 transmits the color information subject to data compression through a transmission line. A receiving section 70 receives the transmitted color information and decodes the compressed color information by a decoder 80.

Description

DETAILED DESCRIPTION OF THE INVENTION 11) Description of the field to which the invention pertains The present invention relates to a color image reproducing device for transmitting and receiving color image signals through a transmission path.

(2) Description of the conventional technology In a conventional color image reproducing device, an analog method uses a luminance signal as a method of separating an input section and an output section and transmitting and receiving an image signal between them using a transmission path such as a line. There is a method of converting 9 color difference signals into a narrow band in a wide band, and in the digital method, there is a method of transmitting and receiving the number of RGB bits in parallel in a 9-in-line or line-sequential format.

However, compared to multi-value information of a monochrome image, the amount of data in multi-value information of a 2-image is three times that of the multi-value information of a black and white image, and data compression is required to shorten transmission time and reduce image memory. An example of this is the compression method using the bit plane method as shown in FIG. 1, which is used for transmitting still images and as image files.

The bit plane method is as shown in Figure 1.

R information 1. G information 2. B□In planes a, b, c, ... for each bit of information 3, apply data compression such as run-length encoding used in black-and-white facsimiles to the binary information on each plane of color information. It is something. However, these methods are primarily intended for outputting color image information to a color monitor, and are not intended for outputting color hard copies.

Therefore, the color image information on the transmission path is mainly RGB information, and there is no example of sending and receiving in cyan, magenta, yellow, and black inks, which are recorded information on a hard copy. Also, when transmitting RGB information.

The more gradations per pixel are used to widen the range of color expression, the more the number of gradations per pixel9 For example, even if the bit plane method is used, the disadvantage is that the amount of information increases in proportion to the number of bits, increasing the transmission time. . Also.

When trying to treat black and white images in the same way as color images.

There is a drawback that it is not possible to share the circuit configuration of the transmitting and receiving sections regardless of the type of target image, such as the need to switch the transmission system circuit from the RGB mode to the monochrome mode.

(3) Purpose of the Invention In order to eliminate these drawbacks, the present invention provides a method for using binary information of color ink in the color image signal transmitted and received between the input section and the recording section of the image reproducing device. It is equipped with a circuit, and will be described in detail with reference to the drawings below.

(4) Description of structure and operation of the invention No. 2 This is an embodiment of the color image reproducing device according to the present invention, in which the input section 10 irradiates the original image 10a with the light source 10b, and the spectrometer 20 obtains desired spectral characteristics. RGB weighted by
The M color light components are separated and input to the color converter 50 as a multivalued digital signal. 21 is R information, 22aG information,
23 indicates B information.

The color converter 30 uses RGB multi-value information.

The recording information is converted into binary information of cyan, magenta, yellow, and black inks, and the print image data is stored in the register 40. In addition.

31.41, 51, 81.91 are cyan information, 52, 4
2゜52.92 Hiro magenta information, 33, 43, 53, 8
3゜93 Hiro Yellow Information, 34, 44, 54, 84, 9
4 Represents Hiroguro information.

The redundancy suppression encoder 50 applies a data compression method such as run-length encoding or modified Huffman encoding to the cyan, magenta, yellow, and black print image data stored in the register 40, and the transmitter 60 applies data compression methods such as run-length encoding and modified Huffman encoding. , the data-compressed color information is transmitted through the transmission path. The receiving unit 70 receives the transmitted color information, the decoder 80 decodes the compressed color information, and print image data is stored in the print memory 90. .

The drive circuit 100c takes the print image data stored in the print cartridge 90, performs recording control according to each ink information i, and injects the ink onto the recording medium 100a to create a reproduced image. The λ section 10 and the recording section 100 are scanned synchronously regardless of the scanning means.

In this way, color image signals are sent and received using binary information from the four colors of ink, cyan, magenta, yellow, and black, which are used for recording, without using RGB signals.

In order to send and receive print image data, the redundancy suppression encoding conventionally used in facsimiles can be easily applied, and color image information can be transmitted with the same compression rate for black and white information and #1, reducing transmission time. It has the advantage that it can be shortened.

Also, when sending and receiving black and white images with a color image reproduction device, it is also possible to send and receive RGB multivalued information.

Since only the binary information of black ink is used, there is an advantage that the transmission efficiency is further increased.

(5) Description of effects As explained above, when connecting the input section and recording section of a color image reproducing device with a transmission path, binary information in the color corresponding to the color of the ink used for recording is sent and received. Therefore, redundancy suppression coding used in black-and-white facsimiles can be easily applied to each color.

This has the advantage of reducing transmission time. Also, data is sent and received using print image data.

Not only can it be easily compatible with black and white fax machines, but color image input devices can accept 1 bit each for RGB, 7
Even if there is only the ability to read colors, the color information of the ink is used on the transmission path to send and receive information.

Another advantage is that it can be handled using a common circuit.

[Brief explanation of drawings]

Figure 1 shows the case in which a color still image is transmitted digitally.
FIG. 2 is a conceptual diagram of a bit pattern method, which is one embodiment of the present invention; FIG. 1.2.3 is each color information 1" 1b, c, corresponding to RGB
d is a bit plane of color information, 10 company input section. 20 spectrometers, 30 color converters, 40 registers. 50 is a redundancy suppression encoder, 60 is a transmitter, 70 is a receiver, 80 is a decoder, and 90 is a print memory. 100 is a recording section, 21 is R information, and 22 is enlarged G information. 23 is B information, 31, 41, 51, 81.91 is cyan information, and 52, 42, 52, 82.92 is magenta information. 55.45.53 and 83.93 represent yellow information, and 64.degree. 44.54 and 84.94 represent black information. Patent applicant Hiroshi Mori, patent attorney representing Nippon Telegraph and Telephone Public Corporation

Claims (1)

[Claims] A power 2-image comprising an input section that scans a color original image and digitally reads RGB color image signals, and a recording section that records and reproduces the read color image by mixing color inks. In a reproducing apparatus, when transmitting and receiving color image signals by connecting an input section and a recording section through a transmission path, the transmitted and received color image signals are used for recording cyan and magenta. It is binary information of ink consisting of four colors of yellow and black, and the input section has a color converter that develops each color information into a dot image when recording, and each color information is transmitted in line sequential format and data compressed. 1. A color image reproducing device comprising: a redundancy suppression encoder and a transmitter for decoding the received color image signal;