JPS6122846A - Image display apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image display device included in, for example, an ultrasonic diagnostic I1fT device.

[Technical background of the invention and its problems] In recent years, in ultrasonic diagnostic equipment, the structure of one frame of an ultrasound image has become more complex due to the complexity of the data processing image structure due to the diversification of ultrasound beam scanning patterns. The cycle tends to be longer.

By the way, ultrasound images are normally displayed in real time (real time), but as mentioned above, if the composition period of one screen of ultrasound images becomes longer, the displayed image on the television (TV) monitor will change in time. This causes the inconvenience of discontinuity. This is because, although the dynamic characteristics of the human eye generally require a display image on a TV monitor to display at least 30 frames per second (depending on various conditions), ultrasound images are only a fraction of that number. This is because it only consists of degrees.

Conventionally, the read-modify-write operation of the frame memory was used to weight the previously captured data each time the Vicrel corresponding to the scanning of the ultrasound beam was accessed, and this weight was applied to the newly captured data. So-called frame correlation processing, which smoothes the data by adding the data, was performed.

However, if the frame correlation processing described above is J:, it is effective when the period of one frame of the ultrasound image is shorter than or about the same as the period of one frame of the TV monitor; Sufficient smoothing cannot be achieved when the cycle of one frame of an image becomes long or when the image displayed on a TV monitor is a discontinuous image such as a so-called frame-by-frame image. As a result, the human eye can no longer perceive Noritsuka (Raratsugi).
It is impossible to expect an image display with excellent medical diagnostic performance.

[1st aspect of the invention] The present invention has been made in view of the above circumstances, and is capable of processing even if the image to be displayed is a discontinuous image such as a frame-by-frame image. An object of the present invention is to provide an image display device that can display a clear image by doing so.

"Summary of the Invention J" The summary of the present invention for achieving the above object is to provide an image display device having a display means and processing image data sequentially transferred from an image data source and displaying the processed image data on the display means. , a frame memory group that stores image (α) data transferred from the image data source and is capable of reading out the stored image data multiple times in accordance with a one-screen configuration periodic signal of the display means; A straight line for smoothing the image data transferred from the image data source by multiplying the image data read from the group by a multiplier that sequentially changes every time a periodic signal constituting one screen of the display means is generated. The present invention is characterized by comprising an interpolation means.

[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a case where an image display device according to an embodiment of the present invention is applied to an ultrasonic diagnostic apparatus. FIG. 1 shows a switching means for distributing and outputting gradation value addition data (image data) transferred from an ultrasonic diagnosis 11i device (image data source) (not shown) to an output terminal A or B according to a switching signal IFS; 2 is a frame memory group, and this frame memory group 2 includes a first frame memory 2a that stores image data inputted through the output terminal A of the switching means 1, and an output terminal B of the switching means 1. a second frame memory 2b for storing image data inputted via the first frame memory 2b; a third frame memory 2G for storing image data read from the first frame memory 2a;
and a fourth frame memory 2d for storing image data read out from the frame memory 2b. 5 is an inverter, which inverts the switching signal IFS and applies it to the R/W terminals of the first and fourth frame memories 2a, . . . , 2d and a fifth frame memory 7, which will be described later. In addition, the above-mentioned 2. The switching signal IFS is directly applied to the R/W terminals of the third frame memories 2b, 2C and the sixth frame memory 8, which will be described later. 6 is addition number data AD transferred from an ultrasonic diagnostic device (not shown)
7 is a fifth frame memory that stores the addition number data inputted through the output terminal A of the switching means 6; , 8 is a sixth frame memory for storing the addition number data inputted through the output terminal B of the switching means 6. Further, 9 is a switching means for selecting either the output of the first frame memory 2a or the output of the second frame memory 2b according to the switching signal IFS, and 10 is the output of the fourth frame memory 2d. and a switching means for selecting either one of the outputs of the third frame memory 2C, and 11 a switch for selecting either the output of the fifth frame memory 7 or the output of the sixth frame memory 8. It is a means.

912 is a linear interpolation means for smoothing input image data;
a multiplier 12a, a second multiplier 121 which multiplies the image data inputted via the switching means 10 by a sequentially decreasing multiplier W2; A weight counter 12c that is cleared at the falling edge of the screen configuration periodic signal IFC, and outputs the sequentially increasing multiplier W1 and the sequentially decreasing multiplier W2 by counting one image screen configuration periodic signal VD of a display means (not shown). and the above-mentioned No. 1. Second multiplier 12a, 1
It has an adder 12d that adds the outputs of 2b. Furthermore, 13 converts the output of the adder 12d to the switching means 11.
The output ODE is provided for display on a display means (not shown), such as a television monitor, via a D/A (digital-to-analog) conversion means (not shown).

Note that the switching (g TFS) is a binary signal whose state changes every frame periodic signal IFc of the ultrasound image.The switching means 1 and 6 also output a "high" level signal to the SEL terminal. is applied, the input data is output from the output terminal A, and conversely, when a "low" level signal is applied, the input data is output from the output terminal B.Furthermore, the above-mentioned switching Means 9, 10, and 11 output the data input through the input terminal A when a low J level signal is applied to the SEL terminal, and conversely, when a high level signal is applied. It is assumed that the data input through the input terminal B is outputted to the first and second room memories 2a and 2b and the data to the m5 and sixth frame memory 7.8. Writing is performed by the pixel clock of the image data source system, and data is written to the third and fourth frame memories 20.2d and the first to sixth frame memories 2a, 2b, 2C, and 2d.

It is assumed that data reading from 7.8 is performed using the pixel clock of the display means system.

Next, an explanation will be given of the operation of the embodiment of the apparatus using the double-sided formation, with reference also to FIGS. 2 and 3.

FIG. 2 is an O-chart for explaining the operation of the apparatus of this embodiment, in which WR is the write state, RD is the read state, and the O ink pad number is 1 of the data transferred from the image data source. It shows the order of each screen.

For convenience of explanation, the first frame memory 2a and the fifth frame memory 2a
It is assumed that the first-transferred gradation value addition data IAD■ and its addition count data ADD■ have already been stored in the frame memory 7 of FIG.

First, at Tusl in the periodic signal IFC constituting one screen of the ultrasound image in FIG. 2, the switching signal IFS becomes the "low j level."
d and the fifth frame memory 7 are in the read state 1. '!
2. Second. The frame memories 2b, 2c and the sixth frame memory 8 are in a write state.

Therefore, the gradation value addition data IAD■ newly transferred from the image data source in the relevant Tusl is written to the second frame memory 2b via the output terminal B of the switching means 1, and is also transferred in the same cycle. Addition (iria “-
The data ADD■ is written into the sixth frame memory 8 via the output terminal B of the switching means 6. In the Tusi, the storage contents of the first frame memory 2a and the fifth frame memory 7 (respectively IAD■,
ADD■) is read. The read IAD■ is input to the first multiplier 12a via the input terminal A of the switching means 9, and is also written into the first and third frame memories 2C. At the same time, the stored contents of the fourth frame memory 2d are read out and inputted to the input terminal A of the switching means 10, but in the Tus1 period, the fourth
There is no data yet in the frame memory 2d (
TIJS2), the linear interpolation means 12 receives the I input via the input terminal A of the switching means 9
AD■ (This data is entered multiple times in T tv@)
Smoothing is performed only on That is, as will be described in more detail later, the first multiplier 12a multiplies the IAD■ by a multiplier W1 that increases sequentially, and the result is input to the divider 13 via the adder 12d. A divider 13 sends the output of the adder 12d to the fifth frame memory 7.
Post-processing of the averaging process performed in the ultrasonic diagnostic apparatus is performed by dividing by the number of addition data (ADD■) read from the above. This processing result OED is provided for image display on a display means (not shown). Here, in the image display of the display means, four images whose gradation values sequentially increase each time one screen configuration period Ttv are switched and displayed, although TAD■ is the image portion. IAD■ is the first
This is because the data is read out from the frame memory 2a four times for each Ttv, and weighted 4J is performed using the multiplier W1 that increases sequentially for each Ttv.

Next, one screen of the ultrasound image, di
In the cell T1132''C, the switching signal IFS is at the "high" level. As a result, the first. The fourth frame memories 2a, 2'tl and the fifth frame memory 7 are in the write state, the second . Third frame memory 2b.

2C and the sixth frame memory 8 are in a read state.

Therefore, the gradation value addition data IAD■ newly transferred from the image data source in the Tus2 cycle is the switching means 1.
Added 9-value data A is written to the first frame memory 2a through the output terminal A of
DD■ is written into the fifth frame memory 7 via the output terminal A of the switching means 6. Therefore, in the TuS2, multiple times (
4 times in the drawing), the second frame memory 2b and the sixth frame memory 2b
The memory contents of the frame memory 8 (respectively IAD ■).

Δ()D■) is read out. The read IAD■ is input to the first multiplier 12a via the input IB of the switching means 9, and is also written into the third frame memory 2C. At the same time, the storage contents (■ΔD■) of the third 7-frame memory 2C are read out every Ttv, and the read IAD■ is sent to the second multiplier 12b via the input terminal B of the switching means 10. is input.

The first multiplier 12a multiplies the input IAD■ by a multiplier W1 that increases sequentially. Also, the second multiplier 1'2b
Now, the input ■Δ and D■ are multiplied by a multiplier W2 that decreases sequentially. Here, the multiplier W1 that increases sequentially and the multiplier W2 that decreases sequentially are the one-screen configuration periodic signal qVD of the display means.
It is output by the weight counter 12c that counts . still,
The counting state of the weight counter 12c is cleared at the falling edge of the one-frame periodic signal IFC of the ultrasound image.

Said 1st. The outputs of the second multipliers 12a and '12b are added by an adder 12d and then input to the divider 13. As mentioned above, this divider 13 is connected to the adder 12d.
Post-processing of the averaging process is performed by dividing the output by the number of additions read from the fifth frame memory 7, and the processing result is displayed on a display means (not shown). Here, the display means includes IAD■ and IAD■
are displayed at the same time, but the gradation value of [AD■, that is, the image data that was captured earlier, decreases sequentially at every Tt'v, and the gradation value of [AD■, that is, the image data that was captured later] decreases sequentially at each Tt'v, and The adjustment value will increase sequentially every T[V. As a result, the transition from IΔD■ to IAD■ becomes very smooth on the display screen.

It should be noted that T in the periodic signal IFC that constitutes one screen of the ultrasound image
133, the IAD newly transferred from the image data source
(2) is written to the second frame memory 2b, and this time the fourth frame memory 2d and the first frame memory 2a
IAD■ and IAD■ read from each are subjected to smoothing processing by the linear interpolation means 12.

In the display after the smoothing process, the gradation values for IAD■ gradually decrease, and the gradation values for IAD■ increase sequentially.

FIG. 3 is an explanatory diagram showing the state of smoothing processing of image data in the linear interpolation means 12 of the apparatus of this embodiment. The gradation value of a predetermined pixel before smoothing processing is 1 in the ultrasound image.
Even if there is a sudden change as shown by the solid line 14 for each screen configuration period Tus, the gradation value of the same pixel after the smoothing process becomes very smooth as shown by the broken line 15. This prevents flicker from being perceived by the human eye.

Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above-mentioned embodiment, and can be modified as appropriate within the scope of the gist of the present invention. In particular, the configuration of the frame memory group 2 and linear interpolation means 12 in FIG. 1 is one example, and the configuration is not limited to this. Further, the function of the linear interpolation means 12 can also be realized by software according to a predetermined program.

Further, in the above embodiment, the case where the device of this embodiment is applied to an ultrasound diagnostic device has been described, but the image display device according to the present invention is capable of displaying all kinds of image data regardless of the image data source. .

When so-called averaging processing is not required for the image data to be displayed, the switching means 6 and 11. Fifth and sixth frame memories 7 and 8. Divider 13 customers are of course unnecessary.

In the above embodiment, the linear interpolation means 12 sequentially changes the gradation of pixels, but it is also possible to change the color tone sequentially.

[Effects of the Invention] As detailed above, according to the present invention, even if the image to be displayed is a discontinuous image such as a frame-by-frame image, it can be smoothed by linear interpolation means. By doing so, it is possible to provide an image display device that can display smooth images. For example, if the image display device according to the present invention is applied to an ultrasonic diagnostic device, it is possible to display images with excellent medical diagnostic performance.

[Brief Description of the Drawings] Fig. 1 is a block diagram showing a case where an image display device according to an embodiment of the present invention is applied to an ultrasonic diagnostic device, and Fig. 2 explains the operation of the device of the first embodiment. FIG. 3 is an explanatory diagram showing the state of smoothing processing of image data in the linear interpolation means of the apparatus of this embodiment. 2... Frame memory group, 2a... First frame memory, 2b...!・・・
...Second frame memory, 2C...Third frame memory, 2d...Fourth frame memory, 12...Linear interpolation means, 12a... ...First multiplier, 12b... Second multiplier, 12c... Weight counter, 12d...
・Kakanki.・、、゛Representative Patent Attorney Masayoshi Misawa;.゛;

Claims (4)

[Claims] (1) An image display device having a display means and processing image data sequentially transferred from an image data source and displaying the processed image data on the display means, which stores the image data transferred from the image data source and also stores the image data transferred from the image data source. a frame memory group capable of reading out image data multiple times in accordance with a one-screen configuration periodic signal of the display means; and a frame memory group capable of reading the image data read out multiple times according to a one-screen configuration periodic signal of the display means; An image display device comprising linear interpolation means for smoothing image data transferred from the image data source by multiplying the image data by a multiplier that changes sequentially for each image data source. (2) The frame memory group has first and second frame memories that alternately store image data transferred from the image data source for each screen, and when one is in a storage state, the other is in a read state. , the third frame memory which stores the read image data when the image data in the first frame memory is read and is capable of reading out the stored contents at the same time as the second frame memory; It is characterized by having a fourth frame memory which stores the image data read out when the image data in the second frame memory is read out, and whose storage contents can be read simultaneously with the first frame memory. An image display device according to claim 1. (3) The linear interpolation means includes a first multiplier that multiplies image data captured after the image data source among the two sets of image data read out from the frame group by a sequentially increasing multiplier; a second multiplier that multiplies the image data captured earlier than the image data source in the image data by a sequentially decreasing multiplier; and a one-screen configuration period signal of the display means within one screen configuration period of the image data source. a weight counter that outputs the sequentially increasing multiplier and the sequentially decreasing multiplier to the first and second multipliers by counting; and an addition that adds the outputs of the first and second multipliers. Claim 1 characterized in that it has a part.
2. The image display device according to claim 1 or 2. (4) The image display device according to any one of claims 1 to 3, wherein the image data sequentially transferred from the image data source is ultrasound image data.