JP2975469B2 - Image evaluation device and image display device using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus which is used, for example, in a memory display of a video printer to detect , evaluate, and output the movement of an image to be displayed.

[0002]

2. Description of the Related Art In an apparatus for converting a video signal into a still image, such as a memory display of a video printer, as shown in FIG. 4, a sampled analog video signal of a first field and a sampled analog video signal of a second field are digitally converted. The image data is processed, stored in a frame memory, and displayed on a monitor. However, if a moving image is stored in a frame, different image data is obtained in field 1 and field 2. If the image data is displayed on a monitor as it is, a so-called flicker phenomenon occurs, which causes inconsistency and deterioration of image quality. I was Conventionally, in such a case, the image has been resampled, and if it is still insufficient, the mode has been manually switched to the field memory.

[0003]

However, when the image is re-sampled, the image may be different from the original one and the desired image may not be obtained.

The present invention has been made in view of the above circumstances, and is used, for example, in a device for converting a sampled video signal into a still image, so that an image at a desired point in time can be converted into a high quality image and a switching operation can be performed. and to provide a picture <br/> image processing apparatus main Ru without is automatically output.

[0005]

SUMMARY OF THE INVENTION Image processing according to the present invention
The device converts the still image from the sampled video signal.
An image processing apparatus for outputting a still image from a user
In response to the extraction instruction signal, the video signal of the first field is
First field memory and second field for storing
A second field memory for storing the video signal of
First field memory and second field memory
Synchronizes each image data from the
Memory control means for reading the
Comparing means for comparing image data in real time;
The output of the data comparison means is monitored in units of vertical
Motion detection means for detecting the
When there is motion in the image,
Output, and if there is no motion in the image,
Output switching means for outputting a frame output.
And

[0006]

[0007]

When there is no motion in the image stored in the memory, the image data of the first field substantially matches the image data of the second field. If the image has motion, a corresponding difference occurs between the image data of the first field and the image data of the second field sampled with a predetermined time difference. The motion of the stored image is detected by simultaneously comparing each image data once stored and monitoring the comparison result in units of vertical periods.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of an image evaluation device according to the present invention.

In this embodiment, an analog video signal of a first field is stored as a digital signal in a first field memory 1a by switching a memory switch (not shown), and an analog video signal of a second field is stored in a second field memory 1b. And stored as a digital signal. The field memories 1a and 1b carry a read / write circuit 2 as memory control means.

The read / write circuit 2 issues a read signal to the field memories 1a and 1b in synchronization with a vertical synchronization signal from a synchronization signal generation circuit (not shown). Thus, the image data of the first field and the image data of the second field are simultaneously read from the field memories 1a and 1b, respectively.

The read data for the first field and the second field are input to a comparison circuit 30 as data comparison means 3. The comparison circuit 30 sequentially compares each image data of the first field and the second field sequentially inputted from the field memories 1a and 1b, and detects a clock signal when the data difference is equal to or more than a predetermined value. 4 is output.

The motion detecting means 4 has a counter circuit 41 to which a clock signal from the comparing circuit 30 is input. The counter circuit 41 counts the input clock signal for each vertical cycle, and uses its output as one input of the comparator 42. As the other input of the comparator 42, a predetermined number of clocks set by the setting circuit 43 is used. Thereby, the number of clocks in one vertical period counted by the counter circuit 41 is compared with the set value, and when the count value becomes equal to or larger than the set value, the output level of the comparator 42 rises. This rise means that a vertical period having a large data difference exists between the stored image data of the first field and the image data of the second field. Therefore, the comparator 42
It is detected from the rise of the output that the stored image has motion.

FIG. 2 is a block diagram showing another example of the image judging device according to the present invention.

[0014] The present embodiment, as in the above embodiment, the video signal of the first field stored in the first field memory 1a, and stores the video signal of the second field in the second field memory 1b. Each video signal in the field memories 1a and 1b is read simultaneously by the read / write circuit 2 and input to the data comparison means 3. The data comparison means 3 converts the video signals of the first field and the second field, which are input simultaneously, in an analog manner into the first D / D
The signals are again converted into analog signals A and B by the A converter 31a and the second D / A converter 31b, respectively. Then, the analog signals A and B are input to the difference circuit 32,
, A difference output (A-B) is input to the motion detection means 4 in real time.

The motion detecting means 4 has an integrating circuit 44 for integrating the difference output (AB) from the difference circuit 32. The integration circuit 44 is discharged for each vertical synchronization signal. The integration output for each vertical period is used as one input of the comparator 45.
The other input of the comparator 45 is a predetermined analog output set by the setting circuit 46. In one vertical period, when the integral value of the difference output (AB) becomes equal to or greater than the set value, the output level of the comparator 45 rises. This rise also detects that the stored image has motion.

FIG. 3 is a block diagram showing an example of an image processing apparatus according to the present invention, and shows a color image processing apparatus.

The sampled video signal is input to the analog circuit 5. The analog circuit 5 decomposes the input video signal into color signals (R, G, B). The vertical synchronizing signal obtained by the synchronizing separation is shaped by the synchronizing signal generating circuit 13 and input to the motion detecting circuit 9 described later. The video signal separated into color signals (R, G, B) is converted into a digital signal by the A / D converter 6. On the other hand, the control circuit 8 outputs a write signal to the read / write circuit 2 based on information from the operation circuit 7. Thus, in synchronization with the vertical synchronizing signal, the color data of the first field is written in the first full <br/> Irudomemori 1a, the color data of the second field is also continuously into the second field memory 1b Written.

Each data in the field memories 1a and 1b is input to the motion detecting circuit 9. The motion detection circuit 9
The field memory 1 comprises the data comparing means 3 and the motion detecting means 4 of the above-described image evaluation apparatus.
Based on the data from a and 1b, it is determined whether there is any motion in the stored image. The determination result of the motion detection circuit 9 is input to the control circuit 8. When the motion detecting circuit 9 determines that there is no motion in the image, that is, when the comparator output of the motion detecting means 4 does not rise, the signal switching circuit 10 as the display switching means switches the switch every vertical period. A switching control signal is input from the control circuit 8 to the signal switching circuit 10 so that the switching is alternately performed in the order of. The output of the signal switching circuit 10 is converted into an analog signal by the D / A converter 11, and is monitored and output as a frame signal.

When the motion detecting circuit 9 determines that there is a motion in the image, that is, when the comparator output of the motion detecting means 4 rises, the signal switching circuit 10 switches the switch to the ON state according to an instruction from the control circuit 8. Fix it. Thereby, the first
Only the field image data is D / A converted and output to the monitor.

[0020] Thus, whether there is dynamic vapor to the memory image is automatically determined, based on the determination, by the frame display and field display is automatically switched, high quality images without flicker , At the desired time and without the need for a switching operation.

[0021]

As described above, as described above, the image processing of the present invention
According to the processing device, based on a still image extraction instruction from the user,
The first field memory and the second field memory
The video signals of the first field and the second field are stored.
And simultaneously read the stored data based on the vertical signal.
Out and compare each image data,
Processing for writing and reading pixel data for still images
Not only reduce processing speed and increase power consumption, but also
Based on the movement of the image data obtained by comparing the image data
Frame display or field display
High quality with no flicker phenomenon
A position image can be obtained at any time of the user.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of an image evaluation device according to the present invention.

FIG. 2 is a block diagram showing another example of the image evaluation device according to the present invention.

FIG. 3 is a block diagram illustrating an example of an image display device according to the present invention.

FIG. 4 is a waveform diagram showing an example of a video signal.

[Explanation of symbols]

1a the first field memory 1b second field memory 2 memory control means (read / write circuit) 3 data comparing means 4 the motion detection unit 9 motion detection circuit (data comparison means 3+ motion detection means 4) 10 Display switching means (signal Switching circuit)

Claims (1)

(57) [Claims] 1. The method according to claim 1, further comprising the steps of:
An image processing apparatus for outputting a still image, wherein a first file is output in response to a still image extraction instruction signal from a user.
A first field memory for storing the video signal of the
And a second field for storing the video signal of the second field.
Field memory , the first field memory and the second field memory.
Each image data from the memory is synchronized with the vertical signal.
The memory control means that reads simultaneously and the read image data are compared in real time.
Comparing means for comparing, and monitoring the output of the data comparing means in units of vertical
Motion detection means for detecting the movement of
If there is motion in the image based on the
Field data, and if there is no motion in the image,
Output switching means for outputting a frame
Characteristic image processing device.