JPH0668675B2 - Color image area determination device - Google Patents

Description

The present invention relates to a color image area determination device applied to a transmission image input device in a digital image information transmission system such as a so-called video text.

[Background technology and its problems]

In recent years, with the development of the information society, the development and practical application of digital image information transmission systems such as so-called new media for transmitting various kinds of image information such as video tex and teletext have been promoted. For example, in the UK, a system called PRESTEL has already been put into practical use, and in Japan, the Captain: Charactor And Pattern Telephone Acce
ss Information Network System) was developed, and in addition, Teletel in France, Telidon in Canada, and NAPLP (North American Pre) in the United States.
sentation Level Protocol) and others are being put to practical use.

By the way, I images used in the above-mentioned Terridone system and NAPLP system are treated as a set of geometrical figure regions, and image information is treated as PDI (Picuture Descriptio).
The method of transmitting geometrical command data represented by n Instruction) code is extremely efficient compared to other methods in which image information is associated with mosaic picture elements or represented by character codes. High efficiency is highly evaluated.

However, in the digital image information transmission system using the geometrical command data as described above, it is possible to greatly reduce the amount of image information to be actually transmitted and to perform highly efficient information transmission. However, there is a problem that the work for creating the image information to be actually transmitted, that is, the geometric command data indicating one image requires a great deal of labor and time.

For example, the operation of converting a video signal of an image to be transmitted into the geometrical command data is such that while the operator watches the target image on the monitor television receiver, the operator uses contours and hue / gradation information, etc. It is conceivable to add various corrections after inputting, and then convert it into geometric command data. However, in general, in order to determine each image area of one image represented by a video signal for each area by signal processing on the video signal, the signal level of the luminance signal in the video signal is used. When the image to be handled is a color image, the luminance signal components in the red region and the blue region are close to each other, so that the region cannot be accurately determined.

[Object of the Invention]

In view of the above-mentioned problems, the present invention provides an image area determination device having a novel structure that enables accurate area determination for each image area forming a color image.

[Outline of Invention]

In order to achieve the above-mentioned object, an image area determining device for a color image according to the present invention includes a signal mixing means having variable mixing ratios for mixing three primary color signals representing an original image to be subjected to image processing, and this signal. Mixing ratio setting means for variably setting the mixing ratio of the mixing circuit, quantizing means for quantizing the output of the signal mixing means, and data obtained by quantizing the output of the signal mixing means by this quantizing means And storage means for storing the area determination data.

〔Example〕

An embodiment of a color image area determining apparatus according to the present invention will be described in detail below with reference to the drawings.

In the embodiment shown in FIG. 1, as a video signal indicating a current image to be image-processed, three primary color signals obtained by photographing the above-mentioned original image with a video camera and their synchronizing signals or a standard such as NTSC system is used. A color television signal is provided. The three primary color signals and the sync signal are
The color television signal is supplied to the input selection circuit 7 through the first to fourth signal input terminals 1, 2, 3, 4 and
The input signal is supplied to the RGB encoder 6 through the fifth signal input terminal 5, is converted into the three primary color signals by the RGB encoder 6, and the sync signal is separated from the input selection circuit 7.
Is being supplied to.

The input selection circuit 7 is provided with one of the three primary color signals E _R , E _G , E _B and the sync signal supplied from the first to fourth signal input terminals 1, 2, 3, 4 or the RGB encoder 6. Sy
Select nc. The three primary colors E _R , E _G , and E _B selected by the input selection circuit 7 are supplied to the signal mixer 9 through the variable gain amplifiers 8R, 8G, and 8B, respectively, and the synchronization signal is supplied to the control circuit 30. To be done.

The above variable gain amplifiers 8R, 8G, 8B are control panels.
Each gain is variably adjusted independently of each other by each gain adjuster 21, 22, 23 provided in 20. Then, the signal mixer 9 includes the variable gain amplifiers 8R, 8G,
A mixed output signal obtained by mixing the above three primary color signals at a mixing ratio determined by the ratio of each gain of 8B is output as an image area determination signal.

The image area determination signal obtained by the signal mixing circuit 9 is
After being amplified to an appropriate amplitude by the amplifier 10, the clamp circuit
The black level is fixed by 11, and analog / digital A
It is supplied to the / D converter 12 and quantized by this A / D converter 12. The data obtained by quantizing the image area determination signal by the A / D converter 12 is written into the image memory 13 and, at the same time, is supplied to the digital / analog converter 14 to be converted into a video signal for receiving a monitor television image. The machine 15 can monitor the data, that is, the image area indicated by the image area determination signal.

The data write / read control for the image memory 13 is as follows.
This is performed according to the address data formed by the control circuit 30 based on the synchronization signal Sync. The microcomputer 40 also performs conversion processing of the data written in the image memory 13.

In the embodiment having the above-mentioned configuration, the mixing ratio of the three primary color signals forming the image area determination signal can be arbitrarily variably set by the operation of each gain adjuster 21, 22, 23 provided on the console panel 20, With respect to the image area determination signal for the image area of any color in the original image, an operation such as delicately adjusting the boundary portion of the image area can be performed. Further, since the image area indicated by the image area determination signal can be monitored by the monitor television receiver 15, the operator of the apparatus of this embodiment can use the monitor television receiver.
While looking at 15, the mixture ratio of the three primary color signals can be set to an appropriate value, and more reliable area determination can be performed.

In the embodiment as described above, the region determination data stored in the image memory 13 is, for example, a color changing process for each image region with respect to the primary image represented by the three primary color signals E _R , E _G , and E _B. When performing, the processing target area is used as reference data. For example, the three primary color signals E _R , E _G , and E _B of the original image are directly quantized and stored in an image memory (not shown),
Each data of the processing target area is read from the image memory by using the area determination data as reference data, the average value of each color component is calculated, and the color of the processing target area is designated.

〔The invention's effect〕

As is apparent from the above description of the embodiment, in the image area determining apparatus for a color image according to the present invention, the mixing ratio of the signal mixing means for mixing the three primary color signals representing the original image to form the area determining signal is arbitrarily set. Since variable control is possible, delicate image area determination can be surely performed by the variable control of the mixing ratio, and image processing for each image area can be performed by applying it to image processing for inputting a transmission image in a digital image transmission system. It becomes possible to perform surely and quickly, and the intended purpose can be sufficiently achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a color image area determining apparatus according to the present invention. 1,2,3,4,5 …… Signal input terminal 7 …… Input selection circuit 8R, 8G, 8B …… Variable gain amplifier 9 …… Signal mixer 12 …… A / D converter 13 …… Image memory 14 ...... D / A converter 15 ...... Monitor TV receiver 20 …… Console panel 21,22,23 …… Gain adjuster

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Fujiwara 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Atsushi Miyauchi 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Yoshio Tsuchida 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Junko Kuroiwa 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sonny Within the corporation

Claims (1)

[Claims] 1. A signal mixing means capable of varying a mixing ratio for mixing three primary color signals representing an original image to be subjected to image processing, a mixing ratio setting means for variably setting a mixing ratio of the signal mixing circuit, and the above signal. A region of a color image comprising a quantizing unit for quantizing the output of the mixing unit and a storage unit for storing data obtained by quantizing the output of the signal mixing unit by the quantizing unit as region determination data. Decision device.