JPH0614315A - Video signal processor - Google Patents

Abstract

PURPOSE:To obtain an image processor capable of improving the resolution of a still part even at the time of generating a motion vector image by preparing two movement detecting parts for detecting the presence and absence of vector correction. CONSTITUTION:An encoder 6 and a decoder 11 are respectively provided with vector correction movement detecting circuits 5, 10 and vector non-correction movement detecting circuits 12, 17, the minimum values of their outputs are compared by respective minimum value comparators 14, 19, still parts are detected by validating minimum values most close to a still image, and still image processing which does not correct vector is applied to the detected part. Thereby even when the whole picture is moved by the panning of a camera and a vector is generated, a still part such as a still character on the picture is detected and still image processing is applied to the detected part, thereby improving the resolution of the part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video processing device for transmitting, recording and reproducing a video signal.

[0002]

2. Description of the Related Art In recent years, a video signal processing device has been used in which a video signal is band-compressed by an encoder, transmitted, recorded, and restored by a decoder.

A conventional video signal processing device will be described below with reference to the drawings. FIG. 2 is a block diagram of a conventional video signal processing device. In FIG. 2, reference numeral 1 is a still image processing circuit, 2 is a moving image processing circuit, 3 is a mixing circuit, 4 is a motion vector detecting circuit, 5 is a motion detecting circuit, 6 is an encoder, which is a still image processing circuit 1, a moving image processing circuit 2, and a mixing circuit. It is composed of a circuit 3, a motion vector detection circuit 4, and a motion detection circuit 5. 7
Is a still image processing circuit, 8 is a moving image processing circuit, 9 is a mixing circuit,
Reference numeral 10 is a motion detection circuit, and 11 is a decoder, which includes a still image processing circuit 7, a moving image processing circuit 8, a mixing circuit 9, and a motion detection circuit 10.

The operation of the video signal processing device configured as described above will be described below. The video signal is band-compressed by the encoder 1, transmitted and recorded. The decoder 2 restores the signal.

On the encoder 1 side, the input video signal is input to the still image processing circuit 1, the moving image processing circuit 2, the motion vector detection circuit 4, and the motion detection circuit 5. The video signals band-compressed by the sub-samples in the still image processing circuit 1 and the moving image processing circuit 2 are added by the mixing circuit 3 and output. The mixing ratio at this time is controlled by the output of the motion detection circuit 5. The motion detection circuit 5 detects a motion area from the difference between each frame or field, controls the mixing circuit 3, and performs still image processing in the still image area.
In the video area, increase the mixing ratio of video processing, and
Although it is restored by 1, the aliasing distortion due to band compression is suppressed and the resolution is increased. The motion vector detection circuit 4 detects the motion of the entire screen such as when the camera pans and outputs the vector value. The encoder 6 outputs a band-compressed video signal and a motion vector. In the decoder 11, the video signal from the encoder 6 is input to the still image processing circuit 7, the moving image processing circuit 8, and the motion detection circuit 10. The video signals restored by the still image processing and the moving image processing are added by the mixing circuit 9 and output. The mixing ratio at this time is controlled by the output of the motion detection circuit 10.

In the still picture processing system, the still picture processing circuit 1 of the encoder 6 shifts the phase between the frames and sub-samples it, and the still picture processing circuit 7 of the encoder 2 interpolates the sub-sampled portions between the frames. Processing is performed to increase the resolution of still images.

In the moving image processing system, since there is no correlation between fields, interpolation processing between fields is not performed, but interpolation processing is performed from pixels in the vicinity of the field. In this case, a filter is required for the moving image processing circuit 2 of the encoder 6 and the moving image processing circuit 8 of the decoder 11 for suppressing the aliasing distortion, and the moving image processing has a lower resolution than the still image processing.

Motion vector detection is performed by detecting the vector of this motion by the motion vector detection circuit 4 when the entire screen moves in parallel like when the camera pans, and correcting the position by that vector. , It is intended to increase the resolution by being able to perform still image processing. Gradient method and matching method are known as motion vector detection methods.

[0009]

However, in the above-mentioned conventional structure, a stationary character or number is inserted in the screen, or the whole is moving in one direction and there is a stationary part in the screen. In a scene, a motion vector is generated and a static portion is processed as a moving image, so that there is a problem that the resolution is lowered.

The present invention solves the above-mentioned conventional problems, and provides a video processing apparatus for increasing the resolution of a still portion even when a motion vector image is generated.

[0011]

In order to solve the above problems, a video signal processing device of the present invention has a motion detection circuit with or without motion vector correction in an encoder and a decoder, and has a minimum detection output. By comparing the values and validating the one closer to the still image, the still portion is detected, and the portion is subjected to the still image processing without vector correction.

[0012]

According to the present invention, by comparing the still images obtained by the two motion detections with the above-described configuration, the entire screen moves due to the camera pan or the like, and even when a vector is generated, still characters such as characters stopped on the screen are stopped. It is possible to increase the resolution of the portion by detecting the portion and processing the still image.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a still image processing circuit, 2 is a moving image processing circuit, 3 is a mixing circuit, 4 is a motion vector detection circuit,
5 is a vector correction motion detection circuit, 12 is a vector non-correction motion detection circuit, 13 is a non-linear processing circuit, 14 is a minimum value comparison circuit, 15 is a switch circuit, 16 is a switch circuit, 6
Is an encoder for a still image processing circuit 1, a moving image processing circuit 2, a mixing circuit 3, a motion vector detection circuit 4, a vector correction motion detection circuit 5, a vector non-correction motion detection circuit 12, a non-linear processing circuit 13, a minimum value comparison circuit 14, Switch circuit 1
5 and the switch circuit 16. 7 is a still image processing circuit, 8 is a moving image processing circuit, 9 is a mixing circuit, 10 is a vector correction motion detection circuit, 17 is a vector non-correction motion detection circuit, 18 is a non-linear processing circuit, 19 is a minimum value comparison circuit, 2
0 is a switch circuit, 21 is a switch circuit, and 11 is a decoder, which is a still image processing circuit 7, a moving image processing circuit 8, a mixing circuit 9,
Vector correction motion detection circuit 10, vector non-correction motion detection circuit 17, non-linear processing circuit 18, minimum value comparison circuit 1
9, a switch circuit 20, and a switch circuit 21.

The operation of the video signal processing device configured as described above will be described. First, in the encoder 6, the input baseband video signal has a still image processing circuit 1, a moving image processing circuit 2, a mixing circuit 3, a motion vector detection circuit 4, a vector correction motion detection circuit 5, and a vector non-correction motion detection circuit. 12 is input. The still image processing circuit 1 and the moving image processing circuit 2 perform pixel position correction for each pixel in one screen by the motion vector from the switch circuit 16, and perform still image processing and moving image processing between frames as in the conventional example. Output to the mixing circuit. The mixing circuit 3 includes a switch circuit 15
The mixing ratio is controlled by the motion detection signal from. The motion vector detection circuit 4 detects the motion vector of the entire screen as in the conventional example, and the output thereof is output to the vector correction motion detection circuit 5, the switch circuit 16 and the transmission path.

In the vector correction motion detection circuit 5, the position of the entire screen is corrected by the vector value from the motion vector detection circuit 4 and the correlation is detected by calculating the difference between frames, and the motion amount of each pixel is calculated. There is. On the other hand, the vector non-correction motion detection circuit 12 detects the motion at the same position without performing the position correction by the motion vector. This 2
One of the outputs of the motion detection is switched by the switch circuit 15 and output to the mixing circuit 3. The other passes through the nonlinear processing circuit 13 and is input to the minimum value comparison circuit 14. The minimum value comparison circuit 14 controls the switch circuits 15 and 16 by comparing the minimum values of the outputs of the vector correction motion detection and the vector non-correction motion detection.

When the output of the vector correction motion detection circuit 5 is small, it is a portion that is moving by the motion vector, and the switch circuit 15 is switched to the vector correction motion detection circuit 5 side. Further, the switch circuit 16 switches to the motion vector detection circuit 4 side and is output to the still image processing circuit 1 and the moving image processing circuit 2, and the still image processing circuit 1 and the moving image processing circuit 2 perform position correction by the motion vector. Perform processing.
On the contrary, when the output of the vector non-correction motion detection circuit 12 is small, the zero vector without vector correction has a stronger correlation and is a character that has not moved or is a stationary part on the screen. The uncorrected motion detection circuit 12 is switched to increase the mixing ratio of the still image processing to increase the resolution. The switch circuit 16 is switched to the zero vector side, and the still image processing circuit 1 and the moving image processing circuit 2 perform processing without performing position correction based on the motion vector.

The non-linear processing circuit 13 linearly processes only the level close to the still image of the vector uncorrected motion detection, and performs the non-linear processing in which the moving image of a certain level or more is maximized to perform the minimum value comparison. In addition, the above process is performed only on the still image portion, and in the case of a moving image, the motion vector corrected process is performed.

The decoder 11 receives the band-compressed video signal and the motion vector signal from the encoder 6, and
The video signal is input to the still image processing circuit 7, the moving image / video processing circuit 8, the mixing circuit 9, the vector correction motion detection circuit 10, and the vector non-correction motion detection circuit 17. Further, the motion vector signal is input to the vector correction motion detection circuit 10 and the switch circuit 12.

In the still image processing circuit 7 and the moving image processing circuit 8,
By the motion vector signal from the switch circuit 21, inter-frame and intra-frame interpolation processing is performed for each pixel as in the conventional example. The mixing circuit 9 changes the mixing ratio of the still image and the moving image according to the motion detection signal from the switch circuit 20.

The motion detecting section has the same structure as the encoder 6, and the vector correction motion detecting circuit 10 includes the encoder 6
The position of the entire screen is corrected based on the motion vector values from 1 to 3, and the correlation is detected by taking the difference between the frames to calculate the motion amount of each pixel. On the other hand, the vector non-correction motion detection circuit 17 detects the motion at the same position without performing the position correction by the motion vector.

One of the two motion detection outputs is switched by the switch circuit 20 and output to the mixing circuit 9.
The other passes through the non-linear processing circuit 18, and the minimum value comparison circuit 1
9 is input. The minimum value comparison circuit 19 controls the switch circuits 20 and 21 by comparing the minimum values of the outputs of the vector correction motion detection and the vector non-correction motion detection.

When the output of the vector correction motion detection circuit 10 is small, it is a portion that is moving by the motion vector, and the switch circuit 20 is switched to the vector correction motion detection circuit 10 side. In addition, the switch circuit 21 switches to the motion vector signal side from the encoder 6 and outputs the motion vector signal to the still image processing circuit 7 and the moving image processing circuit 8. With this vector, the still image processing circuit 7 and the moving image processing circuit 8 use the motion vector. The position correction process is performed.

On the contrary, the vector uncorrected motion detection circuit 17
Is small, the zero vector that is not vector-corrected has a stronger correlation, and is a character that has not moved or is a stationary part in the screen, and the switch circuit 20 is switched to the vector-uncorrected motion detection circuit 17 side. , Increase the mixing ratio of still image processing to increase the resolution. In addition, the switch circuit 21
Is switched to the zero vector side, and the still image processing circuit 7,
The moving image processing circuit 8 performs processing without performing position correction based on the motion vector, and aligns the sample points with the encoder 6.

The non-linear processing circuit 18 linearly processes only the level close to the still image of the vector uncorrected motion detection, and performs the non-linear processing in which the moving image of a certain level or more is maximized to perform the minimum value comparison. In addition, the above process is performed only on the still image portion, and in the case of a moving image, the motion vector corrected process is performed.

As described above, according to the present embodiment, two motion detections with and without vector correction are provided, and the minimum values are compared to control the vector correction and the mixture ratio of the still image moving image processing, thereby Is a scene where the whole moves in parallel due to the camera pan etc. and the motion vector is detected,
When there is a still portion such as a character inserted in the screen, the resolution can be increased by detecting the portion by the above-mentioned minimum value comparison and processing the still image.

[0027]

As described above, according to the video signal processing apparatus of the present invention, two motion detections with and without vector correction are provided, and the minimum values are compared, and vector correction and still image moving image processing of still image moving image processing are performed. By controlling the mixing ratio of the processing, the screen moves in parallel due to the camera pan etc. and the motion vector is detected. If there is a portion, the resolution can be increased by detecting that portion by minimum value comparison and performing still image processing.

[Brief description of drawings]

FIG. 1 is a block diagram of a video signal processing device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional video signal processing device.

[Explanation of symbols]

 1 still image processing circuit 2 video processing circuit 3 mixing circuit 4 motion vector detection circuit 5 vector correction motion detection circuit 6 encoding 7 still image processing circuit 8 video processing circuit 9 mixing circuit 10 vector correction motion detection circuit 11 decoder 12 vector non-correction motion Detection circuit 13 Non-linear processing circuit 14 Minimum value comparison circuit 17 Vector uncorrected motion detection circuit 18 Non-linear processing circuit 19 Minimum value comparison circuit

Claims (2)

[Claims] 1. A still image processing circuit, a moving image processing circuit, a mixing circuit for mixing these outputs, a motion vector detection circuit for detecting a motion vector of the entire screen of an image, and an image sample point is corrected by this vector. A vector correction motion detection circuit that performs motion detection by performing a motion detection, a vector non-correction motion detection circuit that does not perform vector correction, a circuit that compares the outputs of two motion detection circuits to a minimum value, and a vector correction motion detection signal based on the comparison result. And a vector non-correction motion detection signal are switched to a mixing circuit, and a switch circuit for switching the motion vector correction and non-correction for each pixel based on the comparison result and outputting to the still image processing circuit and the moving image processing circuit. And a video signal encoder that outputs a video signal and a motion vector, and a video signal and a motion vector output from the video signal encoder. Vector correction motion detection circuit that performs motion detection by correcting the image sample point by the motion vector output from the still image processing circuit, the moving image processing circuit, the mixing circuit, and the video signal encoder A vector uncorrected motion detection circuit that does not perform correction,
A circuit that compares the outputs of the two motion detection circuits to the minimum value, a switch circuit that switches between a vector correction motion detection signal and a vector non-correction motion detection signal based on the comparison result, and outputs the mixed circuit, and a motion vector based on the comparison result. A video signal processing device comprising a video signal decoder equipped with a switch circuit for switching between correction and non-correction for each pixel and outputting to a still image processing circuit and a moving image processing circuit. 2. A non-linear circuit for inputting from a vector uncorrected motion detection circuit of a minimum value comparison circuit of a video signal encoder and a video signal decoder to have a whole moving image except for a level close to a still image. 1. The video signal processing device according to 1.