JPS63234782A - Still picture display device - Google Patents

Abstract

PURPOSE:To obtain a picture of a good picture quality by bringing only the arbitrary area of a display screen into a field still state at the time of outputting a still picture, bringing an area except it into a frame still state and changing a display method according to a picture display mode. CONSTITUTION:In the displayed still picture, the part of a M mode in an all surface M mode or a composite mode, namely, a field still address (d) indicating the position and the size of an area for executing the field still is inputted to a comparator 5 from a field still area setting device 4. A screen display address (e) is inputted to the comparator 5 from a display timing controller 6, so that, it is compared with the address (d) to decide whether the address on the screen indicated by the address (e) is the field still area or not. Consequently, when the address (e) is the field still area, a field still signal (f) is generated and inputted to a switching signal controller 8. When this signal (f) is inputted, the controller 8 monitor displays one of first field data (b) or second field data (c) according to a display switching signal (i).

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a still image display device for an ultrasonic diagnostic apparatus having an R function that creates a television-type still image from a playback signal of a video tape recorder (hereinafter referred to as VTR). In particular,
The present invention relates to a still image display device having a mechanism for placing only a specific area in a still image in a field still state.

(Prior Art) In an image display device that displays a scrolling M mode image of an ultrasound diagnostic device, the amount of movement of the image in the time axis direction is divided into fields of a television image so that the movement appears smooth. It is displayed like this. If this scroll-displayed VTR playback signal is stored in memory frame by frame, the position of the image in the time axis direction will be different for each field, so when reading the memory and outputting a still image, the first field Then, the image of the second field is shifted in the time axis direction, resulting in a double image and a decrease in image quality. Therefore, field still photography is performed to improve this problem. Field still refers to a method in which one frame is made up of two fields in television format images using interlaced scanning, and the first and second fields are displayed with the same data.
The method of displaying the first field's worth of data in the first field and the second field's worth of data in the second field is called frame still.

(Problem to be Solved by the Invention) However, since conventional methods could only perform field stills of the entire display screen, for example, when displaying field stills in a composite mode in which M mode and 8 modes are displayed on the same screen, vertical Since the resolution of the image is halved, the image quality of the 8-mode image is degraded.

Even in the case of text, full-scale M mode image display, M of characters, symbols, etc.
The image quality in areas other than the mode display area deteriorates. Therefore,
In order to avoid deterioration in the image quality of the display screen other than the M mode display area, field still must be canceled and frame still 1 must be used.If M mode and non-M mode images are displayed simultaneously on the same screen, all It was impossible to view the screen in its best quality.

The present invention has been made in view of the above points, and its purpose is to make only an arbitrary area of the display screen into a field still state and to make the other areas into a frame still state when outputting a still image. The object of the present invention is to realize an image display device that can obtain still images of high quality.

(Means for Solving the Problems) The present invention solves the above-mentioned problems in a still image display device that converts and displays a video tape recorder playback signal into a television-type still image. means for converting a signal into a digital signal; two storage means for sequentially and alternately storing the digital signal field by field; a switching means for switching and outputting the two storage means; and setting a field still area on a display screen. The present invention is characterized by comprising means for determining whether or not the screen display is in a field still area, and means for operating the switching means based on a signal from the determining means.

(Function) Converts the VTR playback signal into a digital signal and stores it in two storage means for each field, and if the display address is in the field still area, outputs only one of the two storage means and stores it in the field still area. If not, the two storage means are alternately switched and output.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

The figure is a block diagram of one embodiment of the present invention. In the figure, 1 is an AD converter that converts a VTR playback signal, which is an analog signal, into a digital signal.Among the field data constituting one frame of an image of the output digital signal,
The first field data is stored in the first field memory 2.
, the second field data is stored in the second field memory 3. 4 is a field still area setting device that sets the position and size of the M mode area for field still display in the still image to be displayed, and outputs a field still address d; 5 is a field still area setting device that outputs a field still address d; This is a comparator that compares the field still address d and the screen display address e from the display timing controller 6 indicating the position of the screen of the display device, and outputs the field still signal f when the two match. The display timing controller 6 sends a display control signal 9 to the monitor display system 7 and sends a field discrimination signal @h to the switch control 218 in order to control the display timing on the monitor display system 7, that is, the position of the image to be displayed. Let them input.

The switching signal controller 8 outputs a display data switching signal i which is controlled by the field still signal f when there is a field still signal f, and which is controlled by the field discrimination signal when there is no field still signal f.

Reference numeral 9 denotes a display data switcher which switches and outputs the first field data b from the first field memory 2 and the second field data C from the second field memory 3 in accordance with the display data switching signal i; It is displayed on the monitor display system 7.

Next, the operation of the apparatus configured as described above will be explained.

The VTR reproduction signal is converted into digital write data a by an AD converter 1, and stored in a first field memory 2 and a second field memory 3 for each field.

On the other hand, when a still image is output, the same address is given to both frame memories, and the first field data b and the second field data C are output in parallel.

Field stilling of a specific area is performed as follows.

In the still image to be displayed, a field still address d indicating the position and size of the M mode part in full M mode or composite mode, that is, the area where field still is performed, is input from the field still area setting device 4 to the comparator 5. be done.

On the other hand, since the screen display address e is inputted to the comparator 5 from the display timing controller 6, it is compared with the field still address d, and it is determined that the address on the screen indicated by the screen display address e is the field still area. Determine whether or not.

If the screen display address e is the field still area,
The field still signal [is generated and the switching signal controller 8
is input. When the field still signal " is input, the switching signal controller 8 fixes the display data switching device 9 to one side by the display data switching signal i regardless of the field discrimination signal from the display timing controller 6. , either the first field data b or the second field data C is input to the monitor display system 7.

When the screen display address e is in a field still area (frame still area), the comparator 5 does not output the field still signal f, and the switching signal controller 8 is controlled by the field discrimination signal. In this case, the display data switching device 9 uses the display data switching signal i output from the switching signal controller 8 to switch the first field data b from the TV image if the monitor display system 7 is displaying the first field of the television image. If the second field of the John image is being displayed, the second field data C is controlled to be the screen display data j.

The monitor display system 7 is timing-controlled by a display control signal g from the display timing controller 6 and displays screen display data j.

As explained above, if the field still area setter 4 is set with an area (having various sizes and shapes) for performing M mode field still, the VTR playback signal stored in the memory is read out and created. Only part of the still image can be set to field still status, while the other area is set to frame still status, which prevents deterioration in the image quality of images other than M mode images, making it possible to obtain high quality still images from VTR playback images including M mode images. 1q is possible.

Note that the present invention is not limited to the above embodiments. For example, a controller may be provided for the field still area setting device 4 so that the setting value can be changed in real time. In this way, the M mode area can be set in areas other than those prepared in advance. Further, a plurality of field still areas may be set. By doing so, you can field still only the minimum area necessary when using multi-images, and you can improve image quality in more detail.

(Effects of the Invention) As described above in detail, according to the present invention, a field still area and a frame still area are set in an image on the same screen and each display is performed, and the display method is adjusted according to the image display mode. It is now possible to obtain images of good quality by changing the image quality, which has a great practical effect.

[Brief explanation of drawings]

The figure is a block diagram of one embodiment of the present invention. 1... AD converter 2... First field memory 3... Second field memory 4... Field still area setter 5... Comparator 6... Display timing controller 7. ...Monitor display system 8...Switching signal controller 9...
・Display data switcher

Claims (1)

[Claims] A still image display device that converts and displays a video tape recorder playback signal into a television-type still image, comprising: means for converting an analog input video tape recorder playback signal into a digital signal; and means for sequentially and alternately storing the digital signal by field. two storage means, a switching means for switching output between the two storage means, means for setting a field still area on a display screen, means for determining whether or not a screen display is a field still area; A still image display device comprising: means for operating the switching means in response to a signal from a determining means.