JPH09149364A - Still picture generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a high-definition still picture by surely detecting and erasing a traveling object in a screen and replacing a traveling object part with a background picture. SOLUTION: The same coordinate data of n frames each for several seconds, which is stored in a picture memory 2, is read and the appearance frequency of a data value at each frame is counted by a mobile body and background discriminating circuit 3. The data value with high counting appearance frequency is selected in the max. data detecting part of the mobile body and background discriminating circuit 3 and outputted by discriminating it as background data. Thus, the traveling object part is replaced with background data in an animation for several seconds, which includes unrequited traveling object. By this configuration, the traveling object in the picture is surely detected and erased and the traveling object part is replaced with the background picture so that the high- definition still picture is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still image generating apparatus suitable for use in a still image capturing apparatus such as an electronic still camera, a video camera, etc., and particularly to a background in which an unnecessary moving body such as a passerby is erased. The present invention relates to a still image generation device capable of obtaining a desired still image by replacing

[0002]

2. Description of the Related Art As a conventional still image generating apparatus of this type, for example, a still image video apparatus proposed in Japanese Patent Application Laid-Open No. 2-205183 and a method disclosed in Japanese Patent Application Laid-Open No. 4-362885 are proposed. There is a still image recording / playback device.

A still image video apparatus disclosed in Japanese Patent Laid-Open No. 2-205183 performs high-speed 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 then records them with a video tape recorder. The movement and the movement of the moving image are detected by the movement detecting means, the movement vector calculating means,
Also, a frame image that can be corrected by the data correctability determination means is extracted, and the arithmetic mean is used to extract a still image having a higher S / N than that of the moving picture video tape recorder.

Further, the still picture recording / reproducing apparatus described in Japanese Patent Laid-Open No. 362885/1992, when obtaining a television still picture which constitutes a one-frame screen with two fields such as the NTSC system, makes use of the first field. The pixel data of the image and the second field image at substantially the same screen position are compared with each other to detect a moving area, and the pixel data of the second field image corresponding to the moving portion is set to the first field. By substituting the pixel data of the image, it is possible to obtain a frame still image without blurring and with little deterioration in resolution.

[0005]

However, in the above-mentioned still image generating apparatus, the object is to suppress the blurring and the deterioration of the resolution and to display the moving subject with a high S / N and high quality. When you want to obtain a desired still image at a desired angle, if there is an undesired moving object (subject) such as a passerby in the screen, you can exclude the undesired moving object and obtain the desired high-quality still image. There was a problem that images could not be obtained.

That is, in the case of the one disclosed in Japanese Patent Laid-Open No. 2-205183, since the frame images are added and averaged, there is a problem that only the undesired moving body cannot be completely erased.

Further, in the case of the one disclosed in Japanese Patent Laid-Open No. 362885/1992, since the comparison processing is carried out in a short time of 2 fields (1/30 seconds), it is not possible to cope with a slowly moving moving object, which is not possible. There is a problem that a desired moving object cannot be detected or erased.

The present invention has been made in view of the above points, and it is possible to reliably detect and erase a moving object in a desired screen and replace it with a background image of the moving object portion. An object of the present invention is to provide a still image generation device that can obtain a desired still image.

[0009]

A still image generating apparatus according to the present invention includes a storage unit that stores and holds a plurality of input moving images for each frame, and the same storage unit in each of the plurality of frames stored in the storage unit. Comparing means for comparing pixel data, detecting means for detecting the most frequently appearing data based on the comparison result of the comparing means, and selecting means for selecting and outputting the most frequently appearing data detected by the detecting means. It is equipped with and.

Thus, for example, when a stationary subject is photographed, frame data is held for several seconds to several tens of seconds in a moving image in which a moving body such as a passerby exists between the subject and the image pickup apparatus. Then, the moving object is detected by comparing the frame data, and the most frequently appearing data in the moving object portion is replaced as a background image, so that only the moving object is erased and an undesired object is removed. Can be removed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a still image generating apparatus of the present invention will be described below with reference to FIGS.
Here, FIG. 1 is a block diagram showing a still image generating apparatus of this embodiment, FIG. 2 is a block diagram showing a moving body / background discrimination circuit in the still image generating apparatus of this embodiment, and FIG. 3 is a still image of this embodiment. FIG. 4 is an explanatory view showing a state in which the same coordinate data read from each frame memory in the generation device are arranged in time series, and FIG. 4 is generated for each same coordinate data value read from each frame memory in the still image generation device of this embodiment. Explanatory drawing which shows the histogram which counted the number of times, FIG.
FIG. 4 is an explanatory diagram showing a generated image in the still image generation device of this embodiment.

As shown in FIG. 1, the still image generating apparatus of this embodiment includes an A / D converter 1 for converting an input moving image into digital data, and the digital image data for several seconds per frame. Based on the image memory 2 to be stored and the same coordinate data between frames, a moving body and a background are discriminated from each other, and the portion which is discriminated as a moving body is replaced with the data of the background portion of another frame and is outputted. And a discrimination circuit 3.

In the above structure, the moving object / background discrimination circuit 3
2, counts the number of times the value of the same coordinate data appears in n frames held in the image memory 2 and creates a histogram for each value, and a histogram creation unit 4 The most frequent data detection unit 5 which discriminates a value having a high appearance frequency from the background and outputs the value.
Consists of

Next, the operation of the still image generating apparatus configured as described above will be described. When the same coordinate data of n frames for several seconds stored in the image memory 2 is read out, a data value for each frame as shown in FIG. 3 is obtained, and the appearance frequency of the data value is determined by the histogram creation unit 4 To count. As a result, as shown in FIG. 4, the data value "7" is eight times, the data value "10" is three times,
The result of the appearance frequency that the data value “5” appears twice is obtained.

Then, the number of appearances of each data value is compared in the most frequent data detection section 5, the data value "7" (8 times) having the highest appearance frequency is selected, and this is determined as background data and output. To do. As a result, in a moving image for several seconds including an undesired moving object such as a passerby (FIG. 5A), the moving object portion can be replaced with the background data, so that only the undesired moving object is erased. Desired still image (Fig. 5)
(B)) can be obtained.

As described above, when capturing a desired still image, the still image generating apparatus according to the present embodiment detects an undesired moving object such as a passerby passing through the screen, and obtains high-frequency occurrence data. By specifying it as background data and replacing it with this moving body part, you can obtain the desired still image with only the unwanted moving body completely erased from the screen, and take a commemorative photo such as unnecessary passersby. It is possible to shoot still images.

[0017]

Since the still image generating apparatus of the present invention is configured as described above, it is possible to reliably detect and erase a moving object in a desired screen and replace it with the background image of the moving object portion. Thus, a desired high-quality still image can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a still image generating apparatus of the present invention.

FIG. 2 is a block diagram showing a moving body / background determination circuit in one embodiment of the still image generation apparatus of the present invention.

FIG. 3 is an explanatory diagram showing a state in which the same coordinate data read from each frame memory is arranged in time series in one embodiment of the still image generating apparatus of the present invention.

FIG. 4 is an explanatory diagram showing a histogram in which the number of occurrences is counted for each identical coordinate data value read from each frame memory in the still image generating apparatus according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a generated image in one embodiment of the still image generating apparatus of the present invention.

[Explanation of symbols]

 1 A / D converter 2 Image memory 3 Moving object / background discrimination circuit 4 Histogram creation unit 5 Maximum data detection unit

Claims (1)

[Claims] 1. Storage means for storing and holding a plurality of input moving images for each frame, comparison means for comparing the same pixel data in each of the plurality of frames stored in the storage means, and a comparison means of the comparison means. A still image generation device comprising: a detection unit that detects data having the highest appearance frequency based on the comparison result; and a selection unit that selects and outputs the data that has the highest appearance frequency detected by the detection unit. .