JP3586944B2 - Camera-integrated video signal recording apparatus and recording control method thereof - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a camera-integrated video signal recording device that performs processes such as still image, image enlargement, and image reduction by in-frame processing, and a recording control method thereof.
[0002]
[Prior art]
Generally, a camera-integrated video signal recording device (hereinafter, referred to as a camera-integrated VTR) is most often used as a home camera. For this reason, operability, simplicity, and low price are regarded as important for the camera-integrated VTR, and the image quality of the basic performance of the camera is required.
[0003]
For example, when an image is enlarged or reduced by a camera-integrated VTR having a zoom function for enlarging / reducing an image, the camera-integrated VTR performs signal processing using motion detection based on a frame memory. .
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned camera-integrated VTR, when performing motion detection, a coefficient for motion detection is set irrespective of camera motion due to camera shake or the like. For this reason, it is not possible to follow a sudden movement of the camera or the like, and erroneous detection of the movement occurs, which causes deterioration of image quality.
[0005]
For still images, signal processing is performed between frames and output. For moving images, signal processing is performed in the field and output. And the signal processing in the field are switched, resulting in a change in image quality.
[0006]
Therefore, the present invention has been made in view of the above-described conventional circumstances, and has the following objects.
[0007]
That is, an object of the present invention is to provide a camera-integrated video signal recording device and a recording control method for the same that achieve stable and high image quality.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problem, a camera-integrated video signal recording device according to the present invention outputs camera shake information indicating whether the camera is in a stationary state or a moving state based on camera shake of a subject captured by an imaging unit. A camera shake information unit, a storage unit for writing a video signal obtained by imaging the subject by the imaging unit and reading out the written video signal, and generating a first coefficient value based on the camera shake information from the camera shake information unit The coefficient generation means compares the first coefficient value generated by the coefficient generation means with a value based on the relationship between an arbitrary pixel of the video signal read from the storage means and surrounding pixels. In the case of motion, interpolation is performed from the video signal of the first field read from the storage means based on the detection result of the motion detection means for performing detection and the motion detection means. Field / frame switching means for generating the obtained second-field video signal and selecting and outputting the second-field video signal read from the storage means in the case of stillness; Recording means for recording a video signal based on an output from a / frame switching means on a recording medium.
[0009]
Further, in the camera-integrated video signal recording device according to the present invention, the coefficient generating means has a plurality of levels of coefficient values, and continuously converts the first coefficient value based on the camera shake information from the camera shake information means. It is characterized by being generated by changing to.
[0010]
In the camera-integrated video signal recording apparatus according to the present invention, the coefficient generating means replaces the changed hand shake information with the hand shake information before the change when the hand shake information from the hand shake information means changes by only one field. To generate a first coefficient value.
[0011]
Further, in the camera-integrated video signal recording device according to the present invention, the image pickup unit has a zoom function, and the coefficient generation unit includes a camera shake signal from the camera shake information unit when the zoom function is used. The first coefficient value generated based on the information is continuously changed based on the zoom speed.
[0012]
Also, the camera-integrated video signal recording device according to the present invention generates a second coefficient value based on camera shake information from the camera shake information means, and generates the second coefficient value based on the correction amount based on the second coefficient value. A correcting means for performing image quality correction on a video signal obtained by photographing the subject, wherein the storage means writes the video signal which has been subjected to the image quality correcting process by the correcting means.
A recording control method for a camera-integrated video / video signal recording apparatus according to the present invention includes: a camera shake information detecting step of detecting hand shake information indicating a still state and a motion state based on a camera shake of a subject imaged by an imaging unit; A storage control step of writing a video signal obtained by imaging the subject and controlling the operation of a storage means for reading the written video signal; and a first coefficient value based on the camera shake information detected in the camera shake information detection step And a comparison between a first coefficient value generated in the coefficient generating step and a value based on a relationship between an arbitrary pixel of the video signal read from the storage means and surrounding pixels. A motion detection step of performing motion detection by the motion detection step, and in the case of a motion, A video signal of a second field obtained by interpolation from the read video signal of the first field is generated. In the case of stillness, the video signal of the second field read from the storage means is generated. And a recording step of recording a video signal based on the output in the field / frame switching step on a recording medium.
In the recording control method for a camera-integrated recording apparatus according to the present invention, the coefficient generating step has a plurality of levels of coefficient values, and a first coefficient value based on the camera shake information detected in the camera shake information detecting step. Are continuously changed.
In the recording control method of the camera-integrated recording apparatus according to the present invention, in the coefficient generating step, when the camera shake information detected in the camera shake information detecting step changes only by one field, the changed camera shake information is changed before the change. The first coefficient value is generated by replacing with the camera shake information.
In the recording control method of the camera-integrated recording device according to the present invention, in the coefficient generating step, when a zoom function provided in the imaging unit is used, the camera shake information detected in the camera shake information detecting step is used. The first coefficient value generated based on the zoom coefficient is continuously changed based on a zoom speed.
Further, in the recording control method of the camera-integrated recording apparatus according to the present invention, a second coefficient value is generated based on camera shake information from the camera shake information means, and the correction amount is calculated based on the second coefficient value. A correcting step of performing image quality correction on a video signal obtained by photographing the subject with the imaging unit; and in the storing control step, writing the video signal subjected to the image quality correcting process in the correcting step to a storage unit. It is characterized by.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
The camera-integrated video signal recording device according to the present invention is configured, for example, as shown in FIG.
[0015]
The camera-integrated video signal recording device (hereinafter, referred to as a camera-integrated VTR) 100 includes a lens 1 that forms an optical image of a subject and an imaging device 2 that forms an optical image of the subject by the lens 1. , A sampling / automatic gain control circuit (hereinafter referred to as an S / H-AGC circuit) 3 to which the output of the imaging device 2 is supplied, and an analog / digital (A) to which the output of the S / H-AGC circuit 3 is supplied. / D) converter 4, camera / video signal processing circuit 5 to which the output of A / D converter 4 is supplied, memory system 6 to which the output of camera / video signal processing circuit 5 is supplied, and memory system 6 , The digital / analog (D / A) converters 8 and 12 to which the output of the video signal processing circuit 7 is respectively supplied, and the output of the D / A converter 8 to be supplied Amplification 9, and a video head 10 outputs of the amplifier 9 is supplied.
[0016]
The camera-integrated VTR 100 includes an angular velocity sensor 13, an amplifier 14 to which the output of the angular velocity sensor 13 is supplied, an A / D converter 15 to which the output of the amplifier 14 is supplied, and an output of the A / D converter 15. (Hereinafter, referred to as a microcomputer) 16 to which is supplied.
[0017]
The output of the microcomputer 16 is also supplied to the memory system 6. The output of the D / A converter 12 is connected to an output terminal I._outThrough a monitor (not shown). Further, the signal output from the amplifier 9 is recorded on the tape-shaped recording medium 11 by the video head 10.
[0018]
First, the lens 1 has a variable function such as an aperture, a focus, and a zoom, and forms an optical image of a subject on a photosensitive surface of the imaging device 2.
[0019]
The imaging device 2 is composed of a charge coupled device (CCD), photoelectrically converts the optical image formed by the lens 1, and supplies the photoelectrically converted optical image to the S / H AGC circuit 3 as an electric signal.
[0020]
The S / H-AGC circuit 3 includes a sample and hold circuit and an automatic gain control circuit, and performs level adjustment of an electric signal from the imaging device 2 and performs level adjustment and the like. The electric signal is supplied to the A / D converter 4.
[0021]
The A / D converter 4 digitizes the electric signal from the S / H AGC circuit 3 and supplies the digitized electric signal to the camera / video signal processing circuit 5 as a digital video signal.
[0022]
The camera / video signal processing circuit 5 performs signal processing such as gamma and white balance on the digital video signal from the A / D converter 4 and supplies the processed digital video signal to the memory system 6. .
[0023]
On the other hand, the angular velocity sensor 13 includes a pitch sensor 13a and a deviation sensor 13b, detects a camera shake, and supplies the sensed camera shake to the amplifier 14 as an angular velocity signal.
[0024]
The amplifier 14 has a high-pass filter, cuts and amplifies a DC component of the angular velocity signal from the angular velocity sensor 13, and outputs the amplified signal to the A / D converter 15.
[0025]
The A / D converter 15 digitizes the angular velocity signal from the amplifier 14 and supplies the digitized angular velocity signal to the microcomputer 16 as a digital angular velocity signal.
[0026]
The microcomputer 16 subjects the digital angular velocity signal from the A / D converter 15 to total integration processing and the like, and supplies the digital angular velocity signal subjected to the total integration processing and the like to the memory system 6 as motion information. Although not shown, the microcomputer 16 is supplied with information on an operation performed by the operation unit of the apparatus main body, for example, mode information indicating still image processing, enlargement processing, reduction processing, enlargement / reduction magnification, and the like. It has been made. Therefore, the microcomputer 16 generates a control signal based on the mode information supplied from the operation unit, and supplies the generated control signal to the memory system 6 together with the above-described motion information.
[0027]
The memory system 6 performs image quality correction processing such as edge enhancement processing and pre-filter processing on the digital video signal from the camera / video signal processing circuit 5 based on the motion information and the control signal from the microcomputer 16. Signal processing such as still image processing, enlargement processing, and reduction processing is performed, and a digital video signal that has been subjected to image quality correction processing and signal processing is supplied to the video signal processing circuit 7.
[0028]
A detailed description of the memory system 6 will be described later.
[0029]
The video signal processing circuit 7 shapes the digital video signal from the memory system 6 as a composite video signal, and supplies the formed composite video signal to the D / A converter 8 and the D / A converter 12, respectively.
[0030]
The D / A converter 8 converts the composite video signal from the video signal processing circuit 7 into an analog signal and supplies the analog video signal to the video head 10 via the amplifier 9 as a recording video signal.
[0031]
Therefore, the recording video signal via the amplifier 9 is recorded in a predetermined format on the recording medium 11 by the electromagnetic conversion of the video head 10.
[0032]
On the other hand, the composite video signal supplied from the video signal processing circuit 7 to the D / A converter 12 is converted into an analog signal by the D / A converter 12 and then output to the output terminal I._outIs output to a monitor (not shown) via the.
[0033]
Next, the memory system 6 described above will be specifically described.
[0034]
For example, as shown in FIG. 2, the memory system 6 receives the input terminal I from the camera / video signal processing circuit 5 shown in FIG._in6An image quality correction processing circuit 66 to which a digital video signal is supplied via a CPU, a frame memory 61 to which an output of the image quality correction processing circuit 66 is supplied, a memory controller 64 that controls the frame memory 61, and an output of the frame memory 61 It includes a motion detection circuit 62 and a switching circuit 63 that are supplied, and an enlargement / reduction processing circuit 65 to which the output of the switching circuit 63 is supplied.
[0035]
Then, the motion information is supplied from the microcomputer 16 shown in FIG. 1 to the image quality correction processing circuit 66 and the motion detection circuit 62, and the output of the motion detection circuit 62 is also supplied to the switching circuit 63. ing. The output of the enlargement / reduction processing circuit 65 is supplied to an output terminal I._out6Is supplied to the video signal processing circuit 7 shown in FIG. Further, the microcomputer 16 supplies the motion information to the image quality correction processing circuit 66 and the motion detection circuit 62, and supplies the above-described control signal to each circuit included in the memory system 6, thereby controlling the operation of the entire memory system 6. Has been made to do.
[0036]
The image quality correction processing circuit 66, as shown in FIG._in6, A filter coefficient generating circuit 664, a multiplier 663 to which respective outputs of the high-pass filter circuit 661 and the filter coefficient generating circuit 664 are supplied, and a high-pass filter circuit 661. An adder 662 to which each output of the upper three units 663 is supplied is provided, and the output of the adder 662 is supplied to the frame memory 61 shown in FIG.
[0037]
The high-pass filter circuit 661 is connected to the input terminal I_in6, A delay line circuit 661a to which a digital video signal is supplied via the input terminal I, a delay line circuit 661b to which an output of the delay line circuit 661a is supplied, and an input terminal I_in6And an adder 661c to which the output of the delay line circuit 661b is supplied while the digital video signal is supplied through the adder 661c, and an adder 661d to which the respective outputs of the delay line circuit 661a and the adder 661c are supplied. The output of the adder 661d is supplied to the multiplier 663. The output of the delay line circuit 661a is also supplied to an adder 662.
[0038]
With the above-described configuration, the image quality correction processing circuit 66 performs edge enhancement processing during enlargement processing and performs pre-filter processing during reduction processing using the same circuit.
Z^-1+ K ((2Z^-1− (1 + Z^-2)) / 4 = Z^-1+ K (-(1-Z^-1)²/ 4)
It is represented by
[0039]
That is, first, the delay line circuit 661a is connected to the input terminal I_in6And a delay amount of one horizontal synchronization period (H) is supplied to the digital video signal supplied through the delay line circuit 661b, and the digital video signal delayed by 1H is supplied to the delay line circuit 661b and the adder 662, respectively.
[0040]
The delay line circuit 661b gives the digital video signal from the delay line circuit 661a a delay amount of 1H, and supplies the digital video signal delayed by 1H to the adder 661d. Therefore, the digital video signal output from the delay line circuit 661b is input to the input terminal I_in6Is delayed by 2H with respect to the digital video signal supplied via the.
[0041]
The adder 661c has an input terminal I_in6And a digital video signal obtained by adding the digital video signal supplied through the delay line circuit 661b to the adder 661d.
[0042]
The adder 661d supplies the digital video signal obtained by adding the digital video signal from the delay line circuit 661a and the digital video signal from the adder 661c to the multiplier 663.
[0043]
At this time, the filter coefficient generation circuit 664 generates a filter coefficient to the multiplier 663 based on the control signal from the microcomputer 16 and the motion information.
[0044]
That is, as shown in FIG. 4, the image quality correction processing circuit 66 functions as a prefilter when the value of the filter coefficient K is K = −1, and functions as a bandpass filter for edge enhancement when the value of K = 0 or more. Utilizing such a filter characteristic, the filter coefficient generation circuit 664 generates a positive value filter coefficient at the time of enlargement processing, and generates a negative value filter coefficient K at the time of reduction processing. In addition, the polarity of the filter coefficient K is switched and the value of the filter coefficient K is changed according to the image quality correction amount determined according to the control signal from the microcomputer 16 and the motion information.
[0045]
The image quality correction amount used when changing the value of the filter coefficient K as described above is, for example, based on the motion information MF from the microcomputer 16 as shown in FIG._H= 1 is "weak", K_H= 4 is “strong” and “K_H: 1 <2 <3 <4, and the value changes for each field.
[0046]
Further, the motion information MF indicates a stationary portion by a LOW level signal and a motion portion by a HIGH level signal. Therefore, in FIG. 5, a digital video signal that changes from still to motion between field 2 and field 3 and changes from motion to still between field 9 and field 10 is supplied to the image quality correction processing circuit 66 in FIG. It becomes.
[0047]
In such a digital video signal, X_LTo the stationary field X, X_HIs represented by the motion field X, the filter coefficient generation circuit 664 determines that each field
1_L, 2_L, 3_H, 4_H, 5_H, 6_H, 7_H, 8_H, 9_H, 10_L, 11_L, ...
To the image quality correction amount K_HTo
1,1,2,3,4,4,4,3,2,1,1,1, ...
To change the value of the filter coefficient K.
[0048]
As described above, in the filter coefficient generation circuit 664, the image quality correction amount K_H= 1, and the image quality correction amount K for the motion fields 3 to 9_HIs gradually changed from “2” to “4” and from “4” to “2”, and the image quality correction amount K_H= 1, the value of the filter coefficient K is determined. As a result, the image quality correction amount K increases as the image approaches the field._HAnd the blurring of the image in the field can be apparently reduced.
[0049]
The filter coefficient K generated by the filter coefficient generation circuit 664 is supplied to a multiplier 663. The multiplier 663 converts the digital video signal from the adder 661d, that is, the digital video signal supplied to the image quality correction processing circuit 66. The digital video signal whose signal level is １ ／ of the signal level is multiplied by the filter coefficient K from the filter coefficient generation circuit 664. Then, the multiplier 663 supplies the digital video signal multiplied by the filter coefficient K to the adder 662.
[0050]
The adder 662 converts a digital video signal obtained by adding the digital video signal from the delay line circuit 661a and the digital video signal from the multiplier 663 into a filtered digital video signal as shown in FIG. Is supplied to the frame memory 61 shown in FIG.
[0051]
The frame memory 61 temporarily stores the digital video signal from the image quality correction processing circuit 66 as described above under the control of the memory controller 64 and supplies the stored digital video signal to the motion detection circuit 62 and the switching circuit 63, respectively. I do.
[0052]
The memory controller 64 operates in accordance with a control signal from the microcomputer 16 so that, for example, in a normal state, the digital image signal is written from the image quality correction processing circuit 66 and the written and stored digital image signal is always output. In some cases, the frame memory 61 is controlled so that the writing operation is stopped and the stored digital video signal is decimated and output, and during the enlargement processing, the stored digital video signal is repeatedly output.
[0053]
Therefore, the frame memory 61, for example, stops the writing operation during still image processing and thins out and outputs the stored digital video signal to the motion detection circuit 62 and the switching circuit 63. It outputs repeatedly to the motion detection circuit 62 and the switching circuit 63 (hereinafter, referred to as enlarged output).
[0054]
A detailed description of the output operation of the frame memory 61 to the switching circuit 63 will be described later.
[0055]
The motion detection circuit 62 performs motion detection on the digital video signal from the frame memory 61 using field correlation.
[0056]
That is, the motion detection circuit 62 detects the presence / absence of a motion of an arbitrary pixel B in a digital video signal from the frame memory 61, for example, a video signal of one frame including a first field and a second field as shown in FIG. In this case, using the pixels A, C to J around the pixel B, the presence or absence of motion is determined by the following calculation.
[0057]
Note that the sizes of the pixels A to J are a to j, and the motion detection coefficient is K_M, K1_MExpressed by Also, in FIG. 6 described above, in the NTSC system, when sampling is performed by 4FSC, the size is 910 horizontal × 525 vertical pixels.
[0058]
First,
(Ab) × (bc) <K_M    ... Equation 1
(Bc) × (cd) <K_M    ... Equation 2
The movement in the horizontal direction is mainly detected by Expressions 1 and 2, and when both Expressions 1 and 2 are satisfied, the pixel B is regarded as moving. Also,
(E−b) × (b−f) <K_M    ... Equation 3
(B−f) × (f−g) <K_M    … Equation 4
The movement on the line from the upper left to the lower right is mainly detected by Expressions 3 and 4, and when both Expressions 3 and 4 hold, the pixel B is considered to be moving. Also,
(H−b) × (bi) <K_M    ... Equation 5
(Bi) × (ij) <K_M    ... Equation 6
The movement on the line from the lower left to the upper right is mainly detected by the following Expressions 5 and 6, and when both Expressions 5 and 6 hold, the pixel B is regarded as moving.
[0059]
Further, in addition to Equations 1 to 6, after lowering the horizontal sensitivity of the digital video signal from the frame memory 61 as compared with the normal field difference,
| ((A + c) / 2) -b |> K1_M        ... Equation 7
Auxiliary motion is detected based on the field difference according to Expression 7.
[0060]
Finally, when any of Expressions 1 and 2, Expressions 3 and 4, Expressions 5 and 6, and Expression 7 is satisfied, the pixel B is considered to be moving.
[0061]
Here, when performing the motion detection according to the equations (1) to (7), in order to improve the accuracy of the motion detection, the motion detection coefficient K in the equations (1) to (7) based on the result of the motion detection 1H before_M, K1_M(Hereinafter simply K_MSay. ) Value.
[0062]
That is, assuming that there is a correlation between the motions, if the result of the motion detection 1H before is a motion, the motion detection coefficient K_MIs switched to the movement-progressive state, and if the result of the motion detection 1H ago is still, the motion detection coefficient K_MSwitch to a stationary position.
[0063]
In addition, in the motion detection using the field correlation, a horizontal edge is usually also detected as a motion, and a detection omission occurs when a horizontal line or a fine edge moves. Therefore, in order to prevent omission of motion detection and to remove isolated points due to erroneous detection, a horizontal edge portion is detected, and a detection coefficient K is detected by the detected horizontal edge portion._MSwitch. As a result, more accurate motion detection can be performed.
[0064]
Further, as shown in FIG. 5, the value of the motion detection coefficient KM in Expressions 1 to 7 is calculated based on the motion information MF from the microcomputer 16._M= 1 is the value closest to the frame, K_M= 4 is the value closest to the field, K_M= 2, 3 are intermediate values between the closest to the frame and the closest to the field._M: 1 <2 <3 <4.
[0065]
Therefore, the motion detection circuit 62 detects each field in the digital video signal output from the frame memory 61 to the switching circuit 63.
1_L, 2_L, 3_H, 4_H, 5_H, 6_H, 7_H, 8_H, 9_H, 10_L, 11_L, ...
For the motion detection coefficient K_MTo
1,1,2,3,4,4,4,3,2,1,1,1, ...
The result of performing the motion detection process as_MIs supplied to the switching circuit 63.
[0066]
As described above, in the motion detection circuit 62, the motion detection coefficient K_MOf the motion detection coefficient K at the horizontal edge portion._MSwitch the value of. Also, for the stationary fields 1 and 2, the motion detection coefficient K_M= 1 and the motion detection coefficient K for the motion fields 3 to 9_MIs gradually changed from “2” to “4” and from “4” to “2”, and the motion detection coefficient K_M= 1 and motion detection is performed. As a result, a highly accurate motion detection result R_MCan be obtained.
[0067]
On the other hand, as shown in FIG. 7, the above-described frame memory 61 has three output ports I, each of which can be controlled independently.₁, I₂, I₃It has. The switching circuit 63 is connected to the output port I₁Video signal S from₁And output port I₂Video signal S from₂631 that is supplied with an output of the adder 631 and an output port I₃Video signal S from₃And a switch SW to which the motion detection result R from the motion detection circuit 62 shown in FIG._MIs supplied. The switching circuit 63 outputs the video signal S₁Is the video signal output S^d ₂And the output of the switch SW is set to the video signal output S^d ₁Is output to the enlargement / reduction processing circuit 65 shown in FIG.
[0068]
For example, when a video signal of one frame including the first field and the second field is stored in the frame memory 61, the output port I₁From the n-line video signal S in the first field.₁Is output to the switching circuit 63, and the output port I₂From the video signal S of the (n + 1) line of the first field₂Is output to the switching circuit 63, and the output port I₃From the video signal S spatially₁And video signal S₂Signal S of the line of the second field sandwiched between₃Is output to the switching circuit 63.
[0069]
Then, according to the control signal from the microcomputer 16, for example, when the still image processing is performed, first, when the first field is used as a reference, the switch SW sets the motion detection result R_MIs fixed to the output side of the adder 631. Thereby, the video signal S₁And video signal S₂Is the video signal output S^d ₂And video signal output S^d ₁Is output as it is. That is, the first field is the motion detection result R from the motion detection circuit 62._MRegardless of, it is output as is.
[0070]
Next, when outputting the second field, the switch SW sets the motion detection result R from the motion detection circuit 62 to R._M, The output side of the adder 631 for a moving part, and the video signal S for a stationary part.₃The output is switched to each pixel. As a result, as shown in FIG.₃Any pixel Z of the video signal S₁A corresponding to the pixel Z of the₂The pixel B is replaced with a pixel interpolated with the pixel B corresponding to the pixel Z of the pixel Z. That is, the video signal S₃Any pixel Z of
Z^d= (A + B) / 2
The pixel Z obtained by the following equation^dIs replaced by In the case of a stationary part, the video signal S₃Is output as is.
[0071]
Therefore, the moving portion becomes temporally the same as the first field, the double image stops, and the stationary portion outputs the video signal output S formed by the frame.^d ₁Is obtained.
[0072]
When the enlargement process is performed based on the control information from the microcomputer 16, unlike the above-described still image process, the video signal enlarged and output from the frame memory 61 to the switching circuit 63 is a moving image. Fields are always updated field by field.
[0073]
First, based on the first field, the output port I₁Video signal S from₁Is the video signal output S_d2Is output as At the same time, the switch SW outputs the motion detection result R from the motion detection circuit 62._MBased on the video signal S₃Any pixel of the video signal S₁And the video signal S₂And the pixel corresponding to the arbitrary pixel described above,_d2And the video signal S₃Side switching operation. Thus, the switching operation based on the first field standard is performed.
[0074]
In the next field, a switching operation similar to the switching operation with respect to the first field standard is performed with the second field as the standard. Similarly, the reference field is updated to the third field, the fourth field,... For each field, and the switching operation is performed.
[0075]
The video signal output by the switching operation of the switching circuit 63 as described above is supplied to the enlargement / reduction processing circuit 65 shown in FIG.
[0076]
The enlargement / reduction processing circuit 65 performs pixel interpolation processing on the video signal from the switching circuit 63 based on a control signal from the microcomputer 16 by, for example, bilinear interpolation, and enlarges or reduces the video signal. Generate Then, the enlargement / reduction processing circuit 65 supplies the generated video signal to the video signal processing circuit 7 shown in FIG.
[0077]
As described above, in the camera-integrated VTR 100, based on the information of the angular velocity sensor 13, the value of the motion detection coefficient at the time of performing the motion detection process is switched so as to gradually change, and at the same time, the Switching is performed so that the image quality correction amount also changes gradually. Thus, the motion detection process and the image quality correction process can be performed with the appropriate motion detection coefficient and the image quality correction amount according to the motion of the camera. Therefore, it is possible to prevent erroneous detection of a movement due to a sudden movement of the camera or the like, and to prevent a change in image quality, thereby obtaining a high-quality and stable video signal.
[0078]
In the motion information MF obtained by the microcomputer 16, a change in only one field, for example, as shown in FIG. In the case of a change such as stillness, motion, or stillness between 7 and 9, the motion detection coefficient K is ignored ignoring the motion information MF for the changed field._MAnd image quality correction amount K_HMay be changed.
[0079]
So, in this case, each field
1_L, 2_L, 3_H, 4_H, 5_H, 6_H, 7_H, 8_H, 9_H, 10_L, 11_L, ...
For the motion detection coefficient K_MAnd image quality correction amount K_HIs
1,1,2,3,4,4,4,3,2,1,1,1, ...
It becomes. As a result, it is possible to prevent flickering near the movement threshold value.
[0080]
Further, when zooming is performed, a motion detection coefficient K is set before and after zooming in based on the zoom speed._MAnd image quality correction amount K_HMay be gradually changed.
[0081]
That is, as shown in FIG. 10, for fields 1 and 2 before zooming, the motion detection coefficient K_MAnd image quality correction amount K_H= 1, and the motion detection coefficient K_MAnd image quality correction amount K_HIs gradually changed from “2” to “4” and from “4” to “2”, and for the fields 10 to 11 when exiting the zoom, the motion detection coefficient K_MAnd image quality correction amount K_H= 1.
[0082]
In the camera-integrated VTR 100, the motion information is obtained by the angular velocity sensor 13. However, the motion information may be obtained by detecting a motion vector instead of the angular velocity sensor 13.
[0083]
【The invention's effect】
According to the present invention, camera shake information indicating a stationary state and a moving state is detected based on camera shake of a subject photographed by the imaging unit, and a coefficient value is generated based on the camera shake information. Then, the operation of the storage means for writing the video signal obtained by photographing the subject by the imaging unit and reading the written video signal is controlled in accordance with the still image, the enlargement and reduction processing. The motion detection is performed on the video signal read from the storage means using the coefficient value, and based on the detection result, in the case of a motion, the video signal of the first field read from the storage means A video signal of a second field obtained by interpolating the video signal, and subjecting the video signal subjected to field / frame switching processing to signal processing in accordance with a still image, enlargement and reduction processing Is recorded on a recording medium. This makes it possible to detect a motion using a motion detection coefficient corresponding to the motion of the imaging unit. Therefore, since the accuracy of motion detection can be improved, stable high image quality can be obtained.
[0084]
Further, according to the present invention, a motion can be detected with a more optimal coefficient for motion detection by generating the coefficient by continuously changing the coefficient value based on the camera shake information. Therefore, since the accuracy of motion detection can be further improved, more stable and high image quality can be obtained.
[0085]
Further, in the present invention, when only one field of the camera shake information changes, the changed camera shake information is replaced with the camera shake information before the change to generate a coefficient value, thereby preventing the image flickering near the threshold value of the motion. Can be prevented. Therefore, more stable high image quality can be obtained.
[0086]
In the present invention, when the zoom function is used in the imaging unit, the motion is generated by continuously changing the coefficient value based on the zoom speed. Can be detected. Therefore, since the accuracy of motion detection at the time of zooming can be improved, stable high image quality at the time of zooming can be obtained.
[0087]
Further, in the present invention, the image quality correction processing is performed on the video signal obtained by photographing the subject by the imaging unit with the correction amount based on the coefficient value, so that the correction amount according to the movement of the imaging unit Can perform image quality correction processing. Therefore, image quality deterioration due to blurring of an image in a field or the like can be reduced, so that more stable high image quality can be obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a camera-integrated video signal recording device according to the present invention.
FIG. 2 is a block diagram showing a configuration of a memory system of the camera-integrated video signal recording device.
FIG. 3 is a block diagram showing a configuration of an image quality correction processing circuit of the camera-integrated video signal recording device.
FIG. 4 is a diagram for explaining filter characteristics of the image quality correction processing circuit.
FIG. 5 is a diagram for explaining a relationship between motion information, a motion detection coefficient, and an image quality correction amount.
FIG. 6 is a diagram for explaining a motion detection process.
FIG. 7 is a circuit diagram showing a configuration of a switching circuit of the memory system.
FIG. 8 is a diagram for explaining an interpolation process.
FIG. 9 is a diagram for explaining a relationship between motion information, a motion detection coefficient, and an image quality correction amount (when only one field changes).
FIG. 10 is a diagram for explaining a relationship (in the case of zooming) between motion information, a motion detection coefficient, and an image quality correction amount.
[Explanation of symbols]
6 Memory system
16 microcomputer
61 frame memory
62 Motion detection circuit
63 Switching circuit
64 memory controller
65 Enlargement / reduction processing circuit
66 Image quality correction processing circuit

Claims (10)

A camera shake information unit that outputs camera shake information indicating whether the camera is in a stationary state or a moving state based on camera shake for a subject captured by the imaging unit;
Storage means for writing a video signal obtained by imaging the subject with an imaging unit and reading the written video signal;
Coefficient generating means for generating a first coefficient value based on camera shake information from the camera shake information means;
Motion detection for performing motion detection by comparing a first coefficient value generated by the coefficient generation means with a value based on a relationship between an arbitrary pixel of a video signal read from the storage means and surrounding pixels. Means,
In the case of a motion, a video signal of a second field obtained by interpolation from the video signal of the first field read from the storage means is generated based on the detection result of the motion detection means , Field / frame switching means for selecting and outputting the video signal of the second field read from the storage means in the case of stationary ,
Recording means for recording a video signal based on an output from the field / frame switching means on a recording medium. 2. The coefficient generating means according to claim 1, wherein said coefficient generating means has a plurality of stages of coefficient values, and generates the first coefficient value by continuously changing the first coefficient value based on camera shake information from said camera shake information means. Camera-integrated video signal recording device. When the camera shake information from the camera shake information means changes in only one field, the coefficient generation means generates a first coefficient value by replacing the changed camera shake information with the hand shake information before the change. Item 3. A camera-integrated video signal recording device according to Item 2. The imaging unit has a zoom function, and the coefficient generation means, when the zoom function is used , generates a first coefficient value generated based on camera shake information from the camera shake information means , at a zoom speed. 2. The camera-integrated video signal recording apparatus according to claim 1, wherein the video signal is continuously changed based on the following . A second coefficient value is generated based on camera shake information from the camera shake information means, and image quality is obtained for a video signal obtained by photographing the subject with the imaging unit with a correction amount based on the second coefficient value. A correction means for performing correction,
2. The camera-integrated video signal recording apparatus according to claim 1, wherein said storage means writes the video signal subjected to the image quality correction processing by said correction means. A camera shake information detection step of detecting hand shake information indicating a still state and a motion state based on a camera shake for a subject imaged by the imaging unit;
A storage control step of controlling an operation of a storage unit that writes a video signal obtained by imaging the subject with the imaging unit and reads the written video signal;
A coefficient generating step of generating a first coefficient value based on the camera shake information detected in the camera shake information detecting step;
A motion detection step of performing motion detection by comparing the first coefficient value generated in the coefficient generation step with a value based on a relationship between an arbitrary pixel of the video signal read from the storage means and surrounding pixels; When,
In the case of a motion, a video signal of a second field obtained by interpolation from the image signal of the first field read from the storage means is generated based on the detection result in the motion detection step , If stationary, a field / frame switching step of selecting and outputting the video signal of the second field read from the storage means ;
Recording a video signal based on the output in the field / frame switching step on a recording medium. The recording control method of the camera-integrated video signal recording apparatus. The coefficient generating step has a plurality of levels of coefficient values, and generates the first coefficient value by continuously changing the first coefficient value based on the camera shake information detected in the camera shake information detecting step. Item 7. A recording control method for a camera-integrated video signal recording device according to Item 6. In the coefficient generating step, when the camera shake information detected in the camera shake information detecting step changes in only one field, the changed camera shake information is replaced with the camera shake information before the change to generate a first coefficient value. 8. A recording control method for a camera-integrated video signal recording apparatus according to claim 7, wherein: In the coefficient generating step, when a zoom function provided in the imaging unit is used, the first coefficient value generated based on the camera shake information detected in the camera shake information detecting step is based on a zoom speed. 7. The recording control method for a camera-integrated video signal recording apparatus according to claim 6, wherein the recording signal is changed continuously. A second coefficient value is generated based on camera shake information from the camera shake information means, and image quality is obtained for a video signal obtained by photographing the subject with the imaging unit with a correction amount based on the second coefficient value. A correction step for performing correction,
7. The recording control method for a camera-integrated video signal recording apparatus according to claim 6, wherein in the storage control step, the video signal subjected to the image quality correction processing in the correction step is written to a storage unit.

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