JPH11112872A - Video input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video input device for displaying input video images so as to easily select video images. SOLUTION: This device is provided with a video temporary holding means 2 for temporarily holding video frames, a frame obtaining means 4 for extracting the temporarily held frame, a video display means 5 for displaying the video image by using the extracted frame and a video storage means 3 for storing the frame of a video part selected by a user from the frame of the video temporary holding means 2. In this case, a scene detection means 7 for detecting the scene of the input video image is provided and the frame obtaining means 4 includes the head frame of the respective scenes in the frame to be extracted. Thus, even in the case of thinning and extracting the frame with a fixed interval and displaying the video image, since the head of the scene is surely displayed, an editor recognizes the break of the scene.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video input device for selecting and storing a required portion of a video output from a camera, a deck, or the like, and more particularly, to enabling a required video to be easily selected. Things.

[0002]

2. Description of the Related Art Hitherto, an editing apparatus for selecting and storing a necessary part from a photographed video has been used mainly in a department specializing in video editing such as a broadcasting station. As shown in FIG. 10, the editing apparatus includes a camera 21 for outputting a video,
A monitor 22 for displaying the output video and a recording terminal 23 for storing the video selected by the editor are provided.

A full frame of a video output from the camera 21 is displayed on a monitor 22 of this apparatus, and an editor designates a start point and an end point of storage while watching the screen of the monitor 22, and a recording terminal 23. Stores the video from the start point to the end point.

However, in recent years, with the advent of a high-speed interface having a real-time transmission function, such as IEEE1394, a configuration in which a device such as a deck or a camera is connected to a personal computer terminal without using a monitor, and video is input to the personal computer terminal. Is increasing. Editors use this device to
The user can select an image while viewing the display screen of the personal computer, and load only the necessary image into the storage unit of the personal computer, so that the editing of the image can be easily performed even at home.

[0005] However, in this device, a processor of a personal computer terminal (video input device) to which a video is input receives video,
Since the processing of displaying and storing the video is performed, the workload of one processor becomes heavy. Therefore, in order to reduce the load of video display so as not to hinder the video storage processing, a display method is adopted in which frames of an input video are thinned out at a fixed rate and displayed.

As shown in FIG. 11, this conventional video input device has, as functional blocks, a video receiving means 1 for receiving a video signal from a camera or a deck, and a video temporary storage for temporarily storing the received video signal. Means 2, a fixed display frame obtaining means 4 for extracting a frame from the temporarily stored video frame at a constant decimation rate, a video display means 5 for displaying the video of the extracted frame, and a storage selected by the editor A storage point notifying unit for notifying a start point and an end point; and a video storage unit for extracting and storing a video between a start point and an end point from the video stored in the video temporary storage unit. ing.

In this apparatus, an image input from a camera or a deck is temporarily stored in an image temporary storage means 2, and for example, an image of every three frames is taken out by a constant display frame obtaining means 4, and the image is displayed. It is displayed on the means 5.

[0008] The editor selects an image while watching the image displayed on the image display means 5. The selection information is stored in the storage point notifying means 6.
Transmitted to the video storage means 3 through the
Retrieves the video in the selected range from the video stored in the video temporary storage means 2 and stores it.

In this way, by using this device, it is possible to store only the video selected from the input video.

[0010]

However, in the conventional video input device, since a thinned image of the input video is displayed, a scene break may not be displayed. Usually, an editor selects an image for each scene in an editing operation. Therefore, if a scene break cannot be confirmed, the selection of the image is confused and the work efficiency is reduced.

[0011] In addition, the display of the thinned image has a problem that an unnatural and difficult-to-view image is displayed particularly in a scene where the motion is large, and the editing operation is difficult.

Further, in this apparatus, even if the editor designates the storage start point and the end point, there is a time lag before the information is transmitted to the image storage means 3, so that the image within the range intended by the editor can be quickly set. There is a problem that it cannot be stored.

Further, in this apparatus, the thinning rate of the image display is set to be constant in consideration of safety so as not to hinder the image storage processing. Therefore, even if the processor has enough power, There is a problem that the power cannot be effectively used for displaying images.

The present invention solves the above-mentioned conventional problems, and displays an image in an easily selectable form, stores the range of the image intended by the editor, and displays the power of the processor on the image. It is an object of the present invention to provide a video input device which facilitates selection of a video by effectively utilizing the video input device.

[0015]

Therefore, in the video input apparatus of the present invention, a difference value detecting means for calculating a difference value between frames and a scene detecting means for detecting a scene from the difference value are provided for display. When ensuring that the first frame of the scene is included in the video, switching the display rate according to the average of the difference values of the frames, or storing the video according to the user's selection, ending from the start point of the scene The storage up to the point is started, or the storage is started from a frame having a large difference value located earlier than the selection time.

In addition, depending on whether or not the video is stored, the video display is given a low priority + variable display rate,
Alternatively, switch to the display of high priority + constant display rate, or check the change in the number of frames in the buffer that temporarily stores the frames of the input video at fixed time intervals, and change the display rate according to the amount of change. doing.

Therefore, the video is displayed so that the user can easily select the video, and the video range according to the editor's intention can be stored. In addition, the power of the processor can be effectively used for displaying an image as long as the storage of the image does not interfere.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention provides a temporary video holding means for temporarily holding a frame of an input video, and a frame acquisition for extracting a frame stored in the temporary video holding means. Means, a video display means for displaying a video using the frame extracted by the frame acquisition means, and a video location selected by the user while viewing the video displayed on the video display means, and stored in the video temporary storage means. A video input device comprising: a video storage unit for storing a scene from among the frames stored in the frame. The first frame of each scene detected by the detection means is included, and the image is displayed by frames extracted at regular intervals. Even if, since the beginning frame of a scene are always displayed, editors can grasp the cut of the scene.

According to a second aspect of the present invention, the frame acquiring means extracts frames at a constant frame interval up to the first frame, and then extracts the first frame.
Frame extraction is continued at the same constant frame interval. In this way, frames at constant intervals can be extracted while including the first frame of each scene.

According to a third aspect of the present invention, there is provided a difference value detecting means for detecting a difference value between successive frames of an input video, wherein the frame obtaining means determines a difference value based on an average value of the difference values of a plurality of frames. In addition, the rate of extraction of frames to be extracted from the video temporary holding means is switched, and the display rate can be changed according to the magnitude of the motion of the video.

According to a fourth aspect of the present invention, when the average value of the difference values of a plurality of frames included in each clip exceeds the threshold value M1, the frame acquisition means increases the extraction ratio and sets the average value to the threshold value M2 ( However, when smaller than M2 <M1), the ratio of extraction is reduced.
When the average difference value of the frame is large and the motion of the video is large, the display rate is increased. When the average difference value of the frame is small and the motion of the video is small, the display rate is reduced.

According to a fifth aspect of the present invention, when the video storage means is storing a frame, the priority of the video display means is lowered to display a video at a variable display rate, and the video storage means stores the frame. When the image is not stored, the priority of the image display means is returned to the original state and the image is displayed at a constant display rate. When the image is not stored according to the instruction of the user, the power of the CPU is reduced. It is equally used for video display, and when the video is stored, the power of the CPU is turned on in preference to the storage processing, and the video display at the variable display rate is performed using the remaining power of the CPU.

According to a sixth aspect of the present invention, the frame acquiring means selects the latest frame from the frames held in the image temporary holding means based on a frame request from the image display means for displaying an image at a variable display rate. Is extracted, and in the video display of the variable display rate,
The latest frame image is taken out and displayed.

According to a seventh aspect of the present invention, there is provided a scene detecting means for detecting a scene of an input video, wherein the video storing means pre-stores a video from a scene start point detected by the scene detecting means, If the next scene is detected by the scene detecting means without a storage start instruction from the user, the video of the previous scene is discarded, and the video from the start point of the next scene is stored. When there is an instruction to start storage, the image is kept stored even if the next scene is detected by the scene detection means, and the user selects the video after checking the contents of the scene. Also, the video from the beginning of the scene is stored.

According to an eighth aspect of the present invention, the image storage means stores the image up to the next scene detected by the scene detection means when the storage instruction is received from the user. The video up to the end of the scene is stored according to the user's storage end instruction.

According to a ninth aspect of the present invention, there is provided a difference value detecting means for detecting a difference value between successive frames of an input video, wherein the video storage means receives an instruction to start storage from a user. The video is stored starting from the frame having the largest difference value among the frames up to a certain number of frames before the frame displayed on the video display means at that time, and when the user selects the video, It is possible to set the video storage start point in accordance with the user's intention by eliminating the influence of the delay from when the video is actually stored.

According to a tenth aspect of the present invention, when the image storage means receives an instruction to end the storage from the user, the image storage means sets a predetermined number of frames before the frame currently displayed on the image display means. Of the frame with the largest difference value
The storage of the video up to the previous frame is terminated, and the storage of the video is ended. The effect of the delay from the user's operation to the actual processing is eliminated, and the storage end point of the video is determined by the user. Can be set according to the intent.

According to the present invention, there is provided a display rate changing means for setting a display rate based on a change amount (M) of the number of frames held in the image temporary holding means at a predetermined time interval (t). The frame acquisition means extracts the number of frames corresponding to the set display rate from the video temporary holding means, so that the display rate can be adjusted so as not to hinder the video storage processing. Also, this adjustment can be performed without being affected by instantaneous fluctuations.

According to a twelfth aspect of the present invention, when the change rate (M) exceeds the threshold B1,
The display rate is set to be reduced, and when the change amount (M) is smaller than -B1, the display rate is set to be increased. This effectively utilizes the power of the CPU and hinders the image storage processing. The display rate is increased in a range that does not occur.

According to a thirteenth aspect of the present invention, the display rate changing means sets the threshold value H to the number of frames held in the video temporary holding means at every fixed time (T) corresponding to an integral multiple of t.
When the number of frames exceeds the threshold value H, the display rate is reduced so that the number of frames held in the temporary image holding means gradually increases, and It is possible to prevent a situation in which the processing is hindered as soon as possible.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) The video input device of the first embodiment always displays scene breaks, despite performing thinning-out display of input video.

As shown in FIG. 1, this apparatus comprises a video receiving means 1 for receiving a video signal from a camera or a deck, and a video temporary storing means 2 for temporarily storing the received video signal.
And two consecutive video images stored in the video temporary storage means 2.
A scene detecting unit 7 for extracting a frame to detect a scene break; a constant display frame obtaining unit 4 for thinning out a frame including a frame of a scene break from the video stored in the video temporary storage unit 2; Image display means 5 for displaying the image of the stored frame, storage point notifying means 6 for notifying the storage start point and storage end point selected by the editor, and the image stored in the image temporary storage means 2 , A video storage means 3 for extracting and storing video between a storage start point and a storage end point.

FIG. 2 shows an example of an operation screen of the video input device. Reference numeral 41 denotes an image displayed by the image display means 5, and the editor operates the "input start" button 42 to instruct storage start while operating the "input end" button 43 while watching this image. To indicate the end of storage.

In this apparatus, each time the video receiving means 1 receives one frame of video from a device such as a camera or a deck, it assigns a frame number and stores it in the video temporary storage means 2.

Each frame of the video is stored in the video temporary storage means 2.
Is temporarily stored in the memory. The video temporary storage unit 2 controls the address of the memory accessed by the fixed display frame acquisition unit 4 and the video storage unit 3 so that it does not advance beyond the address of the memory where the video is stored by the video reception unit 1.

The scene detecting means 7 includes the image temporary storing means 2
, Two consecutive frames are taken out, and a difference value of the video information is calculated. For example, when the input video data is DV data encoded according to a standard for digital video equipment, a difference value of a compression ratio for each block is obtained,
The sum is added in a frame unit to calculate the sum of the difference values.

FIG. 3 schematically shows how the calculated difference value for each frame changes according to the input video. The scene detecting means 7 compares the difference value of each frame with a threshold value (M0), and if the difference value exceeds M0, it is a scene break (points a, b, and c in FIG. 3), and exceeds M0. If not, it is determined that the scene is not a break.

The constant display frame acquiring means 4 acquires frames from the temporary image storing means 4 at a constant frame interval. For example, the input video is 30 frames / sec (fps)
When the display rate is 15 fps, every two frames, that is, even-numbered frames are obtained.

When a scene break is notified from the scene detecting means 7, the constant display frame obtaining means 4 obtains frames at a constant frame interval (two frame intervals in the above example) up to the scene break. Next, get the scene break frame (the first frame of the next scene)
Then, from the obtained frame, frames are obtained again at a constant frame interval.

The video display means 5 displays the frames acquired by the fixed display frame acquiring means 4. The editor performs operations of storage start and storage end while watching the video displayed on the video display means 5, and the storage point notifying means 6 sends the storage start and storage end notification to the video storage means 3.

When notified of the start of storage from the storage point notifying means 6, the video storing means 3 acquires the frame number displayed on the video displaying means 5, accesses the memory of the video temporary storing means 2, and The video from that frame number is captured and stored. When the storage end is notified from the storage point notifying unit 6, the frame number displayed on the video display unit 5 is obtained, and the frame number is displayed from the memory of the video temporary storage unit 2.
The video up to that frame number is fetched, and the storage ends there.

As described above, in this apparatus, even when the video is thinned out, the scene break is always displayed. Therefore, the editor can always grasp the break in the scene, so that the editing operation can be performed efficiently.

(Second Embodiment) The video input device of the second embodiment displays a video at a high display rate in a scene where the video changes greatly.

As shown in FIG. 4, this apparatus comprises a video receiving means 1, a video temporary storage means 2, a video display means 5, a storage point notifying means 6, and a video processing means which operate in the same manner as in the first embodiment (FIG. 1). A video storage means 3;
Value detecting means 8 for taking out two consecutive frames of the video image stored in the memory, calculating a difference value, inter-frame difference value storing means 9 for storing the calculated difference value, and displaying based on the difference value. A fixed display frame acquiring unit for acquiring a frame of the image from the temporary image storing unit;

In this apparatus, the difference value between the frames of the input video is calculated by the difference value detecting means 8, and the sum of the calculated difference values for each frame is stored in the inter-frame difference value storing means 9.

The constant display frame obtaining means 4 uses the difference values of the respective frames stored in the inter-frame difference value storage means 9 to calculate the average of the difference values of the frames included in each clip. The clip refers to a lump of video when the video is divided at regular time intervals (for example, at one-second intervals) or for each scene.

Then, the constant display frame obtaining means 4
As shown in FIG. 3, the average of the difference values is equal to a first threshold (M
If the value exceeds 1), the display rate is set to be larger than the average display rate. If the average of the difference values does not reach the second threshold (M2) (where M2 <M1), the display rate is averaged. The acquisition of frames from the video temporary storage unit 2 is adjusted so as to make it smaller than the display rate.

Thus, for example, if the average display rate is 1
In the case of 0 fps, if the average of the frame difference values exceeds M1, the display rate is set to 15 fps. If the average of the frame difference values is lower than M2, the display rate becomes 6 fp.
s.

Therefore, even for an image having a large change,
The video display means 5 can display a video with a smooth movement, and the editor can finely edit the scene by seeing a scene with a large change in detail.

Here, the average of the difference values of the frames is obtained for each clip, but the average may be obtained for every n frames.

(Third Embodiment) The video input device of the third embodiment displays a video by effectively utilizing the power of the CPU.

As shown in FIG. 5, this apparatus comprises a video receiving means 1, a video temporary storage means 2, and a video storage means 3 which operate in the same manner as in the first embodiment (FIG. 1). Priority changing means 11 sometimes lowers the priority of video display and raises the priority of video display when video is not stored, and displays video at a constant display rate when the priority of video display is high. When the video display means 5 displays the video at a variable display rate when the video display priority is low, and obtains frames at regular intervals from the frames stored in the video temporary storage means 2 when the video display priority is high. Is low, the frame acquisition means 10 for acquiring only the latest frame from the frames stored in the video temporary storage means 2 (latest), and the priority change means for notifying the start and end of storage. 11, a (latest) frame obtaining means 10 and a storage point notifying means 6 for notifying the video storing means 3.

In this apparatus, when the image is not stored, the priority of the image display is raised to display the image at a constant display rate, and when the image is stored, the priority of the image display is lowered to display the image at the variable display rate. First, the significance of this is described with reference to FIG.

FIG. 6A shows the CPU usage rate when the video display means 5 displays video at a constant display rate without changing the priority of video display. The power of the CPU is used for processing of the video receiving unit 1, the video display unit 5, and the video storage unit 3, respectively. Among them, the power of the CPU used for the processing of the video storage means 3 varies depending on the position of the seek (operation of positioning the head at the write position) on the magnetic disk. If the power of the CPU allocated to the processing of the video storage means 3 is insufficient, a storage omission of a video frame occurs, and such a situation must be avoided.

Therefore, when the video display means 5 performs video display at a constant display rate consistently before and after the start of storage, a change in CPU power used for processing of the video storage means 3 after the start of storage is anticipated. Therefore, it is necessary to limit the CPU power used for the processing of the video display means 5. Therefore, the CPU usage rate of the video display means 5 must be reduced even before the start of storage where the power of the CPU is sufficient.

On the other hand, in the device of this embodiment,
As shown in FIG. 6B, before the start of the storage, all the extra power of the CPU can be used for the image display of the image display means 5 at a constant display rate. On the other hand, after the storage is started, the remaining power of the CPU used for the processing of the video receiving unit and the video storing unit is allocated to the video display at the variable display rate of the video display unit 5. Therefore, the necessary power of the CPU can always be allocated to the processing of the video storage means, and all of the power of the CPU is effectively used even after the storage is started.

In this apparatus, the priority changing means 11 sets the priority of the video display to a higher priority until receiving the notification of the storage start from the storage point notifying means 6, and the video display means 5 receives the priority. Perform video display at a constant display rate. At this time, the (latest) frame acquisition unit 10 acquires frames from the frames temporarily stored in the video temporary storage unit 2 at a fixed frame interval until the storage start notification unit 6 receives the storage start notification. The image is passed to the image display means 5, and the image display means 5 executes image display at a constant display rate in which display frames are switched at regular time intervals.

On the other hand, upon receiving the notification of the storage start from the storage point notifying means 6, the priority changing means 11 sets the priority of the video display to a lower priority, and in response, the video display means 5 sets the variable display rate. Perform video display in. At this time, the (latest) frame acquisition unit 10 that has received the storage start notification from the storage point notification unit 6 obtains the most recently stored frame from the frames temporarily stored in the video temporary storage unit 2. It is passed to the video display means 5. The image display means 5
When the display of the frame passed from the (latest) frame acquisition unit 10 is completed, the next frame is requested to the (latest) frame acquisition unit 10, and the (latest) frame acquisition unit 10 immediately stores the video The most recently stored frame is acquired from among the frames temporarily stored in the image display unit and passed to the video display unit 5.

The frame storing operation of the video storing means 3 is the same as that described in the first embodiment. While the frame storage by the video storage unit 3 continues, the video display unit 5 and the (latest) frame acquisition unit 10 repeat the video display operation at the variable display rate.

Upon receiving the storage end notification from the storage point notification means 6, the priority change means 11 sets the priority of the video display again to a higher priority, and the (latest) frame acquisition means 10 sets the video temporary storage means. 2. Frames are acquired at regular frame intervals from the frames temporarily stored in
Returns to the video display at the constant display rate.

As described above, in the device of this embodiment, C
The power of the PU can be effectively used for displaying images. For this reason, fine video can be displayed, and the editing operation of the editor can be facilitated.

(Fourth Embodiment) The video input device of the fourth embodiment automatically stores the video from the start point of the scene to the end point of the scene.

As shown in FIG. 7, this apparatus has a video receiving means 1, a video temporary storage means 2, a video display means 5, a fixed display frame obtaining means 4, which operate in the same manner as in the first embodiment (FIG. 1). , A scene detecting means 7 and a storing point notifying means 6, and further, a video storing means 3 for storing from the start point to the end point of the scene using the detection result of the scene detecting means 7.
It has. In addition, the fixed display frame acquisition means 4
Since the result of the scene detection is not sent from the scene detection means 7, the frames stored in the video temporary storage means 4 are obtained only at a fixed frame interval.

The image storing means 3 of this apparatus stores an image from the start frame of the scene detected by the scene detecting means 7 even if there is no instruction to start storing from the storing point notifying means 6. Then, when the start frame of the next scene is notified from the scene detecting means 7, all the images of the previous scene are discarded, and the images are stored again from the start frame of the next scene.

When the notification of “storage start” comes from the storage point notifying means 6 to the video storage means 3, the video storage means 3 sends the notification even if the notification of the start frame of the next scene comes from the scene detecting means 7. Ignore and keep storing the video as it is.

When a notification of “storage end” is sent from the storage point notifying unit 6 to the video storage unit 3, the video storage unit 3 then receives a notification of the start frame of the next scene from the scene detection unit 7. The video up to the start frame of the next scene is stored, and the storage ends.

As described above, the apparatus of this embodiment can automatically store the video from the start point to the end point of the scene selected by the editor. Therefore, the editor can decide whether or not to use the scene from the user by sufficiently observing the displayed video, and the editing operation becomes easier.

(Fifth Embodiment) The video input device according to the fifth embodiment starts storing a video from a frame position where a difference value before that is large when a storage start instruction is given.

This apparatus, as shown in FIG. 8, has a video receiving means 1, a video temporary storage means 2, a video display means 5, a fixed display frame obtaining means 4, which operate in the same manner as in the fourth embodiment (FIG. 7). And a storage point notifying unit 6, a difference value detecting unit 8 for taking out two consecutive frames of the video stored in the video temporary storage unit 2 and calculating a difference value, and a frame for storing the calculated difference value. Inter-difference value storage means 9
And a video storage unit 3 that adjusts the range of frames to be stored based on the difference value data stored in the inter-frame difference value storage unit 9.

The difference value detecting means 8 of this apparatus obtains a difference value between successive frames stored in the video temporary storage means 2 by the operation described in the second embodiment, and calculates the difference value between the frames. It is stored in the storage means 9.

Upon receiving the notification of “storage start” from the storage point notifying means 6, the video storing means 3 obtains the currently displayed frame number from the video displaying means 5, and stores the frame number in the n frames preceding the frame number. Then, the number of the frame having the largest difference value is obtained from the data stored in the inter-frame difference value storage means 9 (position d in FIG. 3), and the storage of the video starts from the frame of this number.

Further, upon receiving the notification of “storage end” from the storage point notifying means 6, the video storing means 3 obtains the frame number currently displayed from the video displaying means 5, and obtains n frames before the frame number. Among them, the number of the frame having the largest difference value is obtained from the data stored in the inter-frame difference value storage means 9 (position e in FIG. 3), and the video up to the frame of this number is stored.

As described above, in the apparatus according to the present embodiment, when the editor gives an instruction, a frame having a large difference value and a well-cut frame before the instruction time is selected as a frame for storage break. . Therefore, even when the process of starting or ending the storage of the video is performed with a delay from the time of the operation of the editor, the process is in accordance with the intention of the editor (that is, the editor usually switches from a screen with a good cut to a good cut). It is possible to store video from frame to frame (selecting up to the screen).

(Sixth Embodiment) The video input device of the sixth embodiment adjusts the display rate by paying attention to the change of the number of frames stored in the video temporary storage means 2 at regular intervals.

As shown in FIG. 9, this apparatus operates as in the first embodiment (FIG. 1), and includes a video receiving unit 1, a video temporary storage unit 2, a video display unit 5, a video storage unit 3, and a storage unit. A point notification unit 6;
Display rate changing means 12 for setting a display rate by paying attention to a change in the number of frames stored at a predetermined time interval, and constant display for extracting frames stored in the video temporary storage means 4 in accordance with the set display rate. And a frame acquisition unit 4.

In this apparatus, when the number of frames stored in the video temporary storage means 2 shows an increasing tendency, and when it becomes necessary to dedicate more CPU power to video storage processing, the CPU
In order to reduce the burden on the video display, the display rate of the video display is reduced.

The display rate changing means 12 calculates the frame number assigned to the received frame by the video receiving means 1 and the frame number of the frame stored in the video storing means 3 at regular time intervals (F frame intervals). Is calculated, and the difference m (= n) of the value n (t) per unit time is calculated.
(T) −n (t−1)) (where t is a unit of the F frame interval). Here, n (t) represents the number of frames stored in the video temporary storage unit 2, and m
Represents the amount of change in the number of frames per unit time (t).

The display rate changing means 12 sets the display rate of the video display means 5 to be reduced when m is larger than a predetermined threshold value (Bound) (m> Bound).
If-(Bound), the display rate of the video display means 5 is set to be increased.

The constant display frame obtaining means 4 extracts the frames stored in the video temporary storage means 4 at predetermined intervals in accordance with the display rate set by the display rate changing means 12 and sends the frames to the video display means 5. The means 5 displays an image at the display rate set by the display rate changing means 12.

As described above, in this apparatus, instead of changing the display rate based on the temporary number of frames stored in the video temporary storage means 4, the number of frames stored in the video temporary storage means 4 is changed. The display rate is adjusted by looking at the F-frame interval. Although the number of frames stored in the video temporary storage means 4 also fluctuates due to instantaneous fluctuations in disk access, etc., this apparatus can ignore such instantaneous fluctuations and adjust the display rate. In addition, it is possible to utilize the power of the CPU while displaying a stable image.

The display rate changing means 12 of this device
When the number of frames n (T) of the video temporary storage means 2 obtained for each fixed time T (= at, a is a constant) is larger than a predetermined threshold (H), (n (T)> H), the display rate is forcibly reduced.

By doing so, it is possible to prevent a situation in which a large number of frames are stored in the temporary image storage means 2 while the state of | m | <Bound continues.

[0084]

As is apparent from the above description, the video input device of the present invention has an effect of facilitating the operation of selecting a required part from the input video.

In a device that includes the beginning frame of a scene in a display image, the image at the beginning of the scene is always displayed even when frames are thinned out at regular intervals.
The editor can recognize the breaks in the scene.

Further, the device for switching the display rate in accordance with the motion of the video can display the video portion showing the fast motion smoothly and in detail, and the editor can display the portion where the change of the video is large in detail. Can be seen.

Further, in an apparatus that displays images at a variable display rate when images are stored and at a constant display rate when images are not stored, the power of the CPU is controlled within a range that does not hinder the image storage processing. It can be used effectively for display, and detailed images can be displayed.

In the device that automatically stores the scene from the start point to the end point, the editor can select a scene after confirming the contents of the scene to some extent on a display screen.

In a device for setting a frame having a large difference value, which is located earlier than the editor's selection time, as the storage start point or end point, the delay from the video selection operation to the actual storage processing is delayed. In addition, the video portion intended by the editor can be stored except for the influence of the above.

Further, in a device for changing the display rate by paying attention to the amount of change in the number of frames held in the image temporary holding means at fixed time intervals, the image storing process is not affected by the instantaneous fluctuation. The load can be estimated, and the power of the CPU can be effectively used for video display within a range that does not hinder the video storage processing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a video input device according to a first embodiment;

FIG. 2 is an example of an operation screen of a video input device,

FIG. 3 is an explanatory diagram showing an example of a change in a frame difference value;

FIG. 4 is a block diagram showing a configuration of a video input device according to a second embodiment;

FIG. 5 is a block diagram illustrating a configuration of a video input device according to a third embodiment;

FIG. 6 is an explanatory diagram illustrating the operation of the video input device according to the third embodiment;

FIG. 7 is a block diagram showing a configuration of a video input device according to a fourth embodiment;

FIG. 8 is a block diagram illustrating a configuration of a video input device according to a fifth embodiment;

FIG. 9 is a block diagram illustrating a configuration of a video input device according to a sixth embodiment;

FIG. 10 is a block diagram showing a configuration of a conventional video editing system.

FIG. 11 is a block diagram showing a configuration of a conventional video input device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 video receiving means 2 video temporary storage means 3 video storage means 4 constant display frame acquisition means 5 video display means 6 storage point notifying means 7 scene detection means 8 difference value detection means 9 inter-frame difference value storage means 10 (latest) frame acquisition Means 11 Priority changing means 12 Display rate changing means 21 Camera 22 Monitor 23 Recording terminal 41 Video display screen 42 Input start button 43 Input end button

Claims (13)

[Claims] 1. A video temporary holding means for temporarily holding a frame of an input video, a frame obtaining means for extracting a frame held by the video temporary holding means, and a video using the frame extracted by the frame obtaining means. And video storage means for storing a video location selected by the user while viewing the video displayed on the video display means from among the frames held in the video temporary storage means. The input device, further comprising: a scene detecting unit that detects a scene of an input video, wherein the frame obtaining unit includes, in a frame extracted from the temporary video holding unit, a start of each scene detected by the scene detecting unit. A video input device comprising: 2. The method according to claim 1, wherein the frame acquisition unit extracts frames at a constant frame interval up to the first frame,
2. The video input device according to claim 1, wherein, after extracting the first frame, extraction of frames is continued at the fixed frame interval. 3. A video temporary holding unit for temporarily storing a frame of an input video, a frame obtaining unit for extracting a frame stored in the temporary video holding unit, and a video using the frame extracted by the frame obtaining unit. And video storage means for storing a video location selected by the user while viewing the video displayed on the video display means from among the frames stored in the video temporary storage means. The input device, further comprising: a difference value detecting unit that detects a difference value between consecutive frames of the input video, wherein the frame obtaining unit is configured to store the video temporary holding unit based on an average value of the difference values of a plurality of frames. A video input device characterized by switching a rate of extraction of a frame extracted from an image. 4. When the average value of the difference values of a plurality of frames included in each clip exceeds a threshold value M1, the frame acquisition unit increases the extraction ratio and sets the average value to a threshold value M2 (where M2 < The video input device according to claim 3, wherein when the value is smaller than M1), the extraction ratio is reduced. 5. A temporary image holding means for temporarily holding a frame of an input image, a frame obtaining means for extracting a frame held by the temporary image holding means, and an image using the frame extracted by the frame obtaining means. And video storage means for storing a video location selected by the user while viewing the video displayed on the video display means from among the frames stored in the video temporary storage means. In the input device, when the video storage unit is storing the frame, the priority of the video display unit is lowered to display a video at a variable display rate, and the video storage unit stores the frame. When there is no video input device, the priority of the video display means is returned to the original, and the video is displayed at a constant display rate. 6. The frame acquisition unit extracts a latest frame from frames held in the image temporary holding unit based on a frame request from the image display unit that displays an image at a variable display rate. The video input device according to claim 5, wherein 7. A temporary image holding unit for temporarily holding a frame of an input image, a frame obtaining unit for extracting a frame held by the temporary image holding unit, and an image using the frame extracted by the frame obtaining unit. And video storage means for storing a video location selected by the user while viewing the video displayed on the video display means from among the frames stored in the video temporary storage means. An input device, comprising: a scene detection unit that performs scene detection of an input video; the video storage unit stores a video from a start point of a scene detected by the scene detection unit in advance;
When the next scene is detected by the scene detecting means without a storage start instruction from the user, the video of the previous scene is discarded, and the video from the start point of the next scene is stored. When there is an instruction to start storage from
An image input device, wherein the image storage is continued even if the next scene is detected by the scene detecting means. 8. The image storing means stores an image up to the next scene detected by the scene detecting means when a storing end instruction is given from a user. Item 8. The video input device according to Item 7. 9. A video temporary holding unit for temporarily holding a frame of an input video, a frame obtaining unit for extracting a frame stored in the temporary video holding unit, and a video using the frame extracted by the frame obtaining unit. And video storage means for storing a video location selected by the user while viewing the video displayed on the video display means from among the frames stored in the video temporary storage means. The input device, further comprising: a difference value detecting unit that detects a difference value between consecutive frames of the input video, wherein the video storage unit is configured to display the video display at the time when a storage start instruction is given from a user. The video is stored with a frame having the largest difference value as a start point among frames up to a certain number of frames before the frame displayed on the means. The video input device. 10. When the video storage means receives a storage end instruction from a user, the difference value is set within a predetermined number of frames before the frame displayed on the video display means at that time. 10. The video input device according to claim 9, wherein the storage of the video is terminated by storing up to a frame immediately before the largest frame. 11. A video temporary holding means for temporarily holding a frame of an input video, a frame obtaining means for extracting a frame stored in the video temporary holding means, and a video using the frame extracted by the frame obtaining means. And video storage means for storing a video location selected by the user while viewing the video displayed on the video display means from among the frames stored in the video temporary storage means. The input device further includes a display rate changing unit that sets a display rate based on a change amount (M) of the number of frames held in the video temporary holding unit at a fixed time interval (t). A video input device for extracting a number of frames corresponding to the set display rate from the video temporary holding means. 12. The display rate changing means sets the display rate to be reduced when the change amount (M) exceeds a threshold value B1, and when the change amount (M) is smaller than -B1, the display rate change means sets the display rate. The video input device according to claim 11, wherein the video input device is set to increase the rate. 13. The display rate changing means compares the number of frames held in the video temporary holding means with a threshold value H at regular time intervals (T) corresponding to an integer multiple of t, and 13. The method according to claim 12, wherein the display rate is set to be reduced when the threshold value H is exceeded.
2. The video input device according to claim 1.