JPH0748856B2 - Still video equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still image video device having a high signal-to-noise ratio (high S / N) using an analog video camera.

2. Description of the Related Art In recent years, recording and printing of still images have become popular with a high-definition video printer using a video floppy disk camera and a laser using a magnetic medium.
In addition, a video tape recorder with a built-in camera is widely used as a moving image recording, and when traveling, a video floppy disk camera or a conventional film camera and a video tape recorder with a built-in camera are often carried. In this case, there is a drawback that the luggage for travel is bulky,
As a countermeasure, a patent (JP-A-63-116137) has also been filed, the content of which allows you to take a photo at the time of shooting with a video camera without having to carry a video camera and still camera separately. We provide a video camera with a still camera that has a still camera built into the grip of the video camera.

In addition, there is a method of carrying only a video tape recorder with a built-in camera and printing one frame of a still image during reproduction.

SUMMARY OF THE INVENTION However, the conventional videotape recorder has a main purpose to take a moving image, and therefore, a still image of one frame is used as an image.
The S / N is only about 43 dB, and there is a drawback that the performance is poor to print out a still image and replace it with a photo.

The present invention provides a still picture video device for generating a still picture image having a higher S / N than an image recorded by a moving picture video tape recorder by using a conventional video tape recorder capable of high-speed electronic shutter function and frame feed control. Is.

Means for Solving the Problems The still image video apparatus according to the present invention is capable of recording an image with a high-speed electronic shutter, and an analog video camera capable of frame-by-frame reproduction of the recorded image, and an analog video camera. Digital conversion means for converting analog video information reproduced by the camera into digital video information, input image frame memory for temporarily storing the digital video information converted by the digital conversion means as an input image, and input image frame Of the images temporarily stored in the memory, the image to be left as a still image,
A standard image frame memory stored as a standard image, a motion detecting unit that compares the standard image stored in the standard image frame memory with the input image stored in the input image frame memory, and detects a difference between them, and a motion detecting unit. Based on the detection result of, the moving direction and the moving amount of the input image with respect to the standard image are obtained, and the moving vector calculating processing means for moving the input image according to the obtained moving direction and moving amount and the moving vector calculating processing means are obtained. It is determined whether or not the moving direction and the moving amount of the input image with respect to the standard image exceeds a predetermined correctable amount, and if the correctable amount is exceeded, the input in the moving vector calculation processing means is performed. Correctability determination means for stopping the image movement processing, and a plurality of frames for storing the processing results of the standard image and movement vector operation processing means A memory means; a frame data arithmetic mean for averaging a plurality of frames of data stored in the plural frame memory means; and a video output terminal for outputting the arithmetic mean result of the arithmetic mean means as still image information. There is.

Action With the above configuration, the amount of change for each frame of the moving image recorded by the video tape recorder is determined to determine whether motion compensation is possible, and for a compensable image, multiple frames are added with the data after motion compensation. This has the effect of obtaining still images with a higher S / N than moving picture video tape recorders.

Embodiment A still image video apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an overall configuration diagram of a still image video apparatus according to an embodiment of the present invention. In FIG. 1, 10 is a video tape recorder, 11 is an A / D converter, 12 is a standard image frame memory, 13 is an input image frame memory, 14 is a motion detection means, 15 is a motion vector calculation processing means, and 16 is Correctability determination means, 17 is a calculation processing data bus, 18 is a plurality of frame memories, 19 is frame data addition and averaging means, and 20 is a video output terminal.

The operation of the still image video apparatus configured as described above will be described.

First, the tape on which the video has been recorded by the high-speed electronic shutter is set on the analog video tape recorder 10 capable of frame-by-frame reproduction for reproduction of the recorded video.
The reproduced video signal is converted into a digital signal by the A / D converter 11 and input to the input image frame memory 13. The first image data is directly input to the plural frame memory 18, is not processed by the adder 19, and is output to the video output terminal 20.

The user determines whether or not to perform the still image processing by looking at the output image content. When the decision is made, the image data input to the multi-frame memory 18 is the standard image frame memory.
Transferred to 12. Here, the video signal recorded by the high-speed electronic shutter is reproduced again by the video tape recorder 10, and the reproduced video signal is digitized by the A / D converter 11 and input to the input image frame memory 13. It In the motion detection means 14, the standard image frame memory
Data is compared between 12 and the input image frame memory 13, and it is determined whether the accumulated difference between the two frame memories 12 and 13 is less than or equal to a preset threshold value. Then, the data in the input image frame memory 13 is stored so as not to overlap with the data previously stored in the multiple frame memory 18. If it is determined that the accumulated difference between the two frame memories 12 and 13 is equal to or more than the threshold value, the moving direction and size of the input image frame memory 13 are set around the center of the image of the standard image frame memory 12. The correctability determining means 16 determines whether the movement amount can be corrected by the movement vector calculating means 15. When the data can be corrected, the data in the input image frame memory 13 is calculated by the movement vector arithmetic processing means 15, and again passes through the arithmetic processing data bus 17 to input image frame memory 13
Stored in. After that, the motion detection means 14 again compares the data only in the effective range of the moving vector to determine whether the accumulated difference between the two frame memories 12 and 13 is less than or equal to the threshold, and it is determined to be less than or equal to the threshold. Then, the data is stored in the multi-frame memory 18 so as not to overlap with the data previously stored.

If the accumulated difference between the two frame memories 12 and 13 is greater than or equal to the threshold value, the standard image frame memory 12
The data in the input image frame memory 13 centering around the center of the image of
Then, the correction possibility determination means 16 makes a determination again. In the compensability determination means 16, the arithmetic processing data bus is used.
When the process using 17 is performed a prescribed number of times or more, or when the movement vector amount is equal to or more than the threshold value, the data in the input image frame memory 13 is discarded and the process is moved to the averaging means 19. In the averaging means 19, the data stored in the multiple frame memory 18 is averaged,
The result is output to the video output terminal 20 as a high S / N still image.

The improvement effect of S / N is N when the total number of frame data stored in the plural frame memory 18 by the above processing is N.
It becomes 10 * Log10 * N (dB), and when N is 10, an improvement effect of about 10 dB can be achieved.

Effects of the Invention As described above, the still image video apparatus of the present invention performs high-speed electronic shutter recording for several seconds on a landscape and an object to be processed as a still image while paying attention to camera shake, and image fluctuation,
A movement detecting means, a movement vector calculation processing means, and
A frame image that can be corrected by the data correctability determination means is extracted, and the addition and averaging of the data is performed using the extracted frame image, so that a high S / N still image can be obtained with the video tape recorder signal.

[Brief description of drawings]

FIG. 1 is a block diagram of a still image video apparatus according to an embodiment of the present invention. 10 …… Video tape recorder, 11 …… A / D converter, 12…
... Standard image frame memory, 13 ... Input image frame memory, 14 ... Motion detection means, 15 ... Movement vector calculation processing means, 16 ... Correctiveness determination means, 17 ... Calculation processing data bus, 18 ... Multiple Frame memory, 19 …… Frame data averaging means, 20 …… Video output terminal.

Claims (3)

[Claims] 1. An analog video camera capable of video recording with a high-speed electronic shutter and capable of frame-by-frame reproduction of the recorded video, and analog video information reproduced by the analog video camera is digital video. Digital converting means for converting into information, an input image frame memory for temporarily storing the digital video information converted by the digital converting means as an input image, and a still image among the images temporarily stored in the input image frame memory A standard image frame memory for storing an image to be left as an image as a standard image, a standard image stored in the standard image frame memory and an input image stored in the input image frame memory, and a motion for detecting a difference between them. Detection means, based on the detection result of the motion detection means, A moving vector calculation processing means for calculating a moving direction and a moving amount of the input image with respect to a standard image and moving the input image according to the calculated moving direction and moving amount; and the standard calculated by the moving vector calculation processing means. It is determined whether or not the moving direction and moving amount of the input image with respect to the image exceed a predetermined correctable amount,
When the amount exceeds the correctable amount, a correctability determination unit that stops the movement process of the input image in the movement vector calculation processing unit, and a plurality of storing the standard image and the processing result of the movement vector calculation processing unit Frame memory means, frame data arithmetic mean for performing arithmetic mean of data of a plurality of frames stored in the plural frame memory means, and video output terminal for outputting arithmetic mean result of the arithmetic mean means as still image information. A still image video device characterized by being provided. 2. The movement vector calculation processing means executes the movement processing of the input image only when the motion detection means determines that the difference between the standard image and the input image is equal to or larger than a predetermined threshold value. The still image video device according to claim (1). 3. The motion detecting means further includes means for comparing the standard image and the processing result of the movement vector arithmetic processing means and detecting a difference between the standard image and the movement vector arithmetic processing means, the movement vector arithmetic processing means being detected by the motion detecting means. The still image video apparatus according to claim (2), wherein the moving process of the input image is repeated until the difference becomes equal to or less than a predetermined threshold value.