Device signal correction movement

 

(57) Abstract:

The invention relates to a system for processing traffic signals used in digital television, in particular to a circuit that performs smoothing of fine signals attributable to an edge region of the moving image and a still image by expanding a possible transition between these areas. The technical result improved image quality. Device signal correction movement contains block 1 HR difference, the spatial filter 2 low pass, block 3 module definition, block 4 determine the maximum, the comparator 5, block 6 up the field, the generator 7 management factors. 2 C. p. F.-crystals, 11 ill.

The invention relates to a system for processing traffic signals used in digital television, in particular to a circuit that performs smoothing of fine signals attributable to an edge region of the moving image and a still image by expanding a possible transition between the above two areas in which the scheme reconstructs temporarily processed signal movement in spatially processed signal movement.

A disadvantage of the known device is the appearance of noise about moving areas, severely reducing the quality of the image.

The technical result improved quality of the image.

In Fig. 1 shows a structural electrical diagram of the device signal correction movement; Fig. unit 2 determine the maximum with window 3x3 image of Fig. 3, 4 of the image window 3x3 given to explain the nature of the device; Fig. 5 is a structural circuit diagram of the unit identification areas; Fig. 6 is an exemplary window of the image obtained using the block identification field; Fig. 7 the first characteristic curve of the block identification field in the performance of the clipping process, and Fig. 8 the second characteristic curve of the block identification field in the performance of the clipping process, and Fig. 9 chart illustrating the extension of the image signal in the case of rectangular 3x3 window image; Fig. 10 chart illustrating the extension of the image signal in the case of rhombic 5x5 window image; Fig. 11 dia is viginia contains block 1 HR difference a spatial filter 2 low pass, block 3 module definition, block 4 determine the maximum, the comparator 5, block 6 up the field, the generator 7 of the coefficients of the control unit 4 determine the maximum includes the first and second blocks 8, 9 delay line, the first, second, third, fourth, fifth and sixth blocks 10, 11, 12, 13, 14, 15 delays in the selection unit 16 selects the best signal, block 6 identification field contains the first and second blocks 17, 18 of the delay line, the first, second, third, the fourth, fifth and sixth blocks 19, 20, 21, 22, 23, 24 delays in the selection, the adder 25.

Device signal correction movement is as follows.

Block 1 HR difference recognizes the difference signals of the motion between the frames that arrive at the spatial filter 2 low pass for the allocation of the low-frequency component of this signal HR difference. The output of the spatial filter 2 low pass there are positive and negative components, and this signal is converted to an absolute value (positive number) unit 3 module definition. Unit 4 determine the maximum, the host is the absolute value selects the maximum value of the signals, coming from placed, moreover, the effect of smoothing is determined in accordance with the choice of the form of the image window. As the experiments showed, rectangular and rhombic shape of the image window provides good smoothing even when the ultra-high frequency detail.

The size and shape of the image window should properly pick up. This is because when the large size of the image window, the image quality may be degraded due to excessive expansion of the movement.

Because the block 4 determine the maximum generates at its output a spatially extended signal, this signal can be used as the control movement of the control signal for soft switching directly from generator 7 factors To control values. Additionally, the output signal of block 4 determine the maximum is compared with a threshold value that is previously set, the comparator 5. At this point, if you find that the output signal of block 4 determine the maximum is greater than a threshold THR, then the value of the selected block 4 determine the maximum admits a maximum value, then the comparator 5 generates a one-bit signal of the movement. This icomponent, the movement which exceeds the threshold value THR, and this signal represents the value that the spatial extends through block 4 determine the maximum. Therefore, it is possible to use this signal movement to implement hard (hardware) switch.

Section 6 of the recognition region, receiving one-bit signal of the motion, is used for reconstructing the spatial image of the image signal, and not to expand traffic signal. In this case, the image reconstruction is carried out by detecting a new area of movement of the image window using movement that exceeds a specified value, and this movement is expanding spatial unit 4 determine the maximum by selecting the maximum value of the window image and the spatial reconstruction of the movement in accordance with movement of the image window. Block 6 up the field again handles the traffic signal, which is pre-adjusted unit 4 determine the maximum, to determine the spatial correlation of a new traffic signal, and it re-defined the traffic signal is supplied to generat choice limits the maximum value of the output signal of block 6 of the recognition region can be easily achieved, to the process of moving easier and make you disappear from the large difference between the center of the field of motion and stationary region. This process is based on the temporal correlation of the signal HR difference, but due to one dimension Fig. 11 the amount of movement can be made based on the movements of X and X3in the direction of the axis X. Therefore, if these signals are expanded in two dimensions, the signal of the new movement can be reconstructed so that it will be presented as a signal of gradual adaptive motion in the interval from 0 to 1, and will have a spatial correlation relative to the time axis or to comply with the time axis, by re-processing the signal components of the movement, which exceeds the specified value.

Unit 4 determine the maximum is for 3x3 rectangular image window that contains the block 16 selecting the maximum signal terminal choice blocks 10, 11, 12, 13, 14, 15 delays on the sample and two blocks 8,9 lowercase delay.

Unit 4 determine the maximum takes the absolute value of human difference signal after spatial filtering on the transmission of low frequencies, which are processed in order, b is AE the first line of the image signal is "a", which goes to the block 1 in the selection of the maximum signal without delay, the signal "B", which is delayed by one sample by the delay block 12 on the sample and a signal which is a delayed signal "in". At the same time the second line is detained at a signal line d, which is delayed by the duration of one line in block 8 of the delay line and is supplied to the block 16 selecting the maximum signal, the signal "e", which is delayed by the duration of one sampling unit 14 delays the sample and the signal "f", which is the signal "e" detainees unit 13 delays the sample.

Further, to accommodate the third row of the image, the block 9 delay line delays the output signal of block 8 of the lower case delay for a duration of one line, which goes to the block 16 selecting the maximum value, block 10 delay select delay signal "q" on one sample, which is received in block 16 of selecting the maximum value, and the block 11 delay select delay signal "h" on one sample, which is also fed to a block 16 selecting the maximum signal. The image signal obtained thereby is shown in Fig. 3. Unit 16 selects the best signal sravnivai value for these traffic signals. In this case, the maximum value M(e), which is selected by the block 16 will be

M(e) MAX(a,b,c,d,e,f,q,h,i) (1),

where M(e) represents the traffic signal of the current position (e).

In Fig. 4 shows a rectangular 3x3 window image whose pixels are replaced by concrete values for illustrative purposes. In this case, in accordance with formula 1, the maximum value M(e) for the image window will be the following:

M(e) MAX(5,6,0,3,2,7,0,1,0) 7 (2).

In this case, when the threshold value for the comparator 5 is assigned the number 4, in accordance with formula 2, the maximum value for the window image in Fig. 4 is the number 7. Therefore, the comparator 5 generates as output one-bit signal movement with a value of 1. As a result, the block 4 determine the maximum recognizes the current position "e" of moving. In this case, the spatial extension of the region of movement is determined by selecting the maximum value of the image window.

Unit 6 identification field is used for identification of the area of movement on the output signal of the comparator 5. In block 6 blocks 17, 18 delay line and blocks 19, 20, 21, 22, 23, 24 delay on the sample are the same as identical blocks in the block 4 up high, and ed is Amenti to the adder.

It is the traffic signals are received by the block 6 up area, are single-bit signals that can take only the values 0 or 1. Therefore the image window, which is formed by the blocks 19, 20, 21, 22, 23 and 24 of the delay on the sample and blocks 17, 18 of the delay line is such as shown in Fig. 6. The adder 25 counts the number of samples and'-i', which corresponds to a value of "1". Thus, the characteristic formula for a block of 6 scope can be represented in the form

S(e) Ax (the number of samples of movements) (3),

where S(e) the output signal of the adder 25, And the weight given to the adder 25 to determine the slope of the characteristic curve in Fig. 7.

You can design the block 6 of the recognition region, which will have characteristics that differ from the defined formula 3. In this case, the characteristic defined by the formula 4 can be obtained by introducing the constants In the formula 3.

S(e) Ax (the number of samples of movements)-C (4).

In this case, the generator 7 the work is performed according to the formula 4, but may block 6 up field when the generator 7 will be unnecessary. In relation to this, the right-shift characteristic, reviewsi predefined value (/A), is present in the Windows image.

The characteristic formula 3 represents a special case of the formula 4 To 0.

Fig. 9 illustrates the extension movement of the rectangular image window for the case when the constant And the characteristic formula 3 is one (1). As for the Windows image I, II and III in Fig. 9 the image window, I is the selection window of the image received from the comparator 5 in block 6 of the recognition region, while the image window II represents the signal sample image when they are not clippered. Additionally, the image window III is the result of a process of clipping for movement with maximum step equal to 7. As should be clear from all of the pixels in the image window levels that were equal to eight and nine, clipped to seven, because it is assigned the maximum step value.

By limiting the maximum value specified block 6 up area, it is possible to simplify the processing of motion and further reduce the difference in movement between the Central parts of the moving areas and immobile regions in the case of the wide picture window. Fig. the tion III shows the result of clipping samples image window II to a maximum level of 7. To get the best effect, it should be noted that the size of the window, the reconstructed block 6 scope must be greater than the window size, image, design unit 4 determine the maximum.

1. Device signal correction movement, containing a spatial low pass filter and a comparator, characterized in that the input unit HR difference, the sign of which is the input luminance or composite, and the output connected to the input of the spatial low pass filter, connected in series block determination module, an input connected to the output of the spatial low pass filter and the block determining the maximum, the output of which is connected to the signal input of the comparator, the control input which is the input threshold value and connected in series block identification field, an input connected to the output of the comparator and generator management factors, the first and second outputs which are output signal correction movement.

2. The device under item 1, characterized in that the block definition contains maximum serially connected first and second blocks of the delay line and the first on the block delay line and an input of the absolute value, and the fourth delay blocks per sample, connected in series fifth, whose input is connected to the output of the second unit delay line, and the sixth delay blocks per sample, while the outputs of all blocks of the delay and the input of the third delay unit in the sample are connected to respective inputs of the block selection signals, the output of which is the output signal of the maximum value.

3. The device under item 1, characterized in that the block scope includes serially connected first and second delay blocks per row and the first and second delay blocks per sample, connected in series third input connected to the input of the first delay block, on-line and is a one-bit input signal, and the fourth delay blocks per sample, sequentially connected to the fifth input of which is connected to the output of the second delay block, on-line, and sixth blocks of the delay on the sample, the outputs of all blocks of the delay and the input of the third delay unit in the sample are connected to respective inputs of the adder, the output which is the output of the extrapolated signal.

 

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