Source: https://patents.google.com/patent/JP4042736B2/en
Timestamp: 2020-08-05 00:26:13
Document Index: 232326055

Matched Legal Cases: ['art 2', 'art 3', 'art 4', 'art 5', 'art 6', 'art 12']

JP4042736B2 - Image processing apparatus and image processing method - Google Patents
JP4042736B2
JP4042736B2 JP2004300495A JP2004300495A JP4042736B2 JP 4042736 B2 JP4042736 B2 JP 4042736B2 JP 2004300495 A JP2004300495 A JP 2004300495A JP 2004300495 A JP2004300495 A JP 2004300495A JP 4042736 B2 JP4042736 B2 JP 4042736B2
JP2004300495A
JP2005269600A (en
義明 松原
2004-02-19 Priority to JP2004043283 priority Critical
2004-10-14 Application filed by ソニー株式会社 filed Critical ソニー株式会社
2004-10-14 Priority to JP2004300495A priority patent/JP4042736B2/en
2005-09-29 Publication of JP2005269600A publication Critical patent/JP2005269600A/en
2008-02-06 Publication of JP4042736B2 publication Critical patent/JP4042736B2/en
238000003672 processing method Methods 0.000 title claims description 15
238000000605 extraction Methods 0.000 claims description 41
239000000284 extracts Substances 0.000 claims description 9
G01N29/048—Marking the faulty objects
The present invention relates to an image processing apparatus and an image processing method for correcting hue and saturation of a video signal.
In general, video equipment such as a television receiver and a television camera is equipped with a device for correcting the hue and saturation of a video signal for the purpose of color adjustment and the like.
Conventionally, as a device for correcting the hue of a video signal, two color difference signals are respectively subjected to color difference conversion by a color difference conversion matrix circuit, and each of the two color difference signals subjected to the color difference conversion is sliced. There is one in which a color region to be corrected is extracted by taking a minimum value (see, for example, Patent Document 1). )
FIG. 8 is a block diagram showing a configuration example of a portion of the color signal extraction circuit of such a hue correction apparatus. Of the color difference signal Cb (= BY) and color difference signal Cr (= RY) input to the color signal extraction circuit, the color difference signal Cb is supplied to the variable gain amplifiers 51 and 52, respectively, and the color difference signal Cr is variable. It is supplied to the gain amplifiers 53 and 54, respectively. The output of the variable gain amplifier 51 and the output of the variable gain amplifier 53 are added by an adder 55, and the output of the variable gain amplifier 52 and the output of the variable gain amplifier 54 are added by an adder 56.
These variable gain amplifiers 51 to 54 and adders 55 and 56 constitute a color difference conversion matrix circuit 50. The color difference signal Cb ′ subjected to color difference conversion is output from the adder 55 and the color difference signal Cr ′ subjected to color difference conversion. Is output from the adder 56.
The color difference signal Cb 'and the color difference signal Cr' are input to the maximum value input extraction circuits 57 and 58, respectively. In addition to the color difference signal Cb 'and the color difference signal Cr', a coefficient signal having a predetermined value is input to the maximum value input extraction circuits 57 and 58, respectively. The maximum value input extraction circuits 57 and 58 each extract a maximum value signal of two input signals, and function as a circuit for slicing the color difference signal Cb ′ and the color difference signal Cr ′.
The output signal of the maximum value input extraction circuit 57 is input to the minimum value input extraction circuit 61 after the input coefficient signal to the maximum value input extraction circuit 57 is subtracted by the subtractor 59. The output signal of the maximum value input extraction circuit 58 is also input to the minimum value input extraction circuit 61 after the subtractor 60 subtracts the input coefficient signal to the maximum value input extraction circuit 58.
The minimum value input extraction circuit 61 is a circuit that extracts a minimum value signal of two input signals. The output signal of the minimum value input extraction circuit 61 is an extracted color signal obtained by extracting the color area to be corrected.
FIG. 9 is a diagram illustrating color areas extracted by the color signal extraction circuit of FIG. 8 on a color difference plane in which the color difference signal Cb and the color difference signal Cr are taken on the x axis and the y axis, respectively. By adjusting the gains of the variable gain amplifiers 51 to 54, a region A11 sandwiched between a half line b1 whose angle with respect to the x axis is θ1 and a half line b2 whose angle with respect to the x axis is θ2 is corrected. Extracted as a color area. A half line bm whose angle with respect to the x-axis is θm is a place where the extracted color signal is maximum.
FIG. 10 is a diagram in which the extracted color signal output from the minimum value input extraction circuit 61 for the color region shown in FIG. 9 is plotted three-dimensionally (the extracted color signal is taken on the Z axis). The extracted color signal increases as the distance from the origin of the color difference plane increases (that is, as the saturation increases), but in the angle direction (hue direction) of the color difference plane, the same curve is drawn regardless of the saturation.
JP-A-11-308628 (paragraph numbers 0012 to 0022, FIGS. 7 and 8)
Incidentally, in recent years, when performing color adjustment or the like, there is an increasing need to arbitrarily correct a desired hue and saturation portion of a video signal in accordance with the hue and saturation.
However, in the conventional hue correction apparatus as shown in FIG. 8, it is difficult to meet such needs from the following points (a) to (c).
(A) As shown in FIG. 11, the values of the angles θ1 and θ2 shown in FIG. 9 are between the half line b1 and the half line b2, and the x axis or y axis (the angle with respect to the x axis is 0 °, 90 If the value is such that there is a position where the angle is 180 ° or 180 ° or 270 °, it is difficult to specify a region sandwiched between the half line b1 and the half line b2, and thus it is difficult to extract a color region. become.
Further, when the difference between θ1 and θ2 exceeds 90 °, the x-axis or the y-axis always exists between the half line b1 and the half line b2. For this reason, it is difficult to extract a large color region in which the difference between θ1 and θ2 exceeds 90 °.
As described above, since a color region that can be extracted as a correction target is restricted, it is difficult to correct a desired hue location in the video signal.
(B) By adjusting the gains of the variable gain amplifiers 51 to 54 in FIG. 8, not only the color region to be extracted is determined, but also the level of the extracted color signal (and thus the extracted color) as shown in FIG. The degree of correction for the region is also determined. In this way, the color difference conversion matrix circuit 50 that determines the color region to be corrected also serves as a circuit that determines the correction amount, so that the video signal can be arbitrarily corrected (for example, the hue and saturation of the video signal are determined). It is difficult to correct them independently of each other.
(C) The color signal extraction circuit of FIG. 8 can extract only one color region as illustrated in FIG. Therefore, for example, when two or more color areas are extracted and corrected respectively as shown as areas A11 and A12 in FIG. 12, it is necessary to provide two or more color signal extraction circuits in FIG. This increases the circuit scale.
In view of the above, the present invention provides an image processing apparatus and an image processing method that can arbitrarily correct a desired hue and saturation portion of a video signal according to the hue and saturation. It was made as an issue.
In order to solve this problem, an image processing apparatus according to the present invention is an image processing apparatus that corrects the hue and saturation of an input video signal, and the hue and saturation of two color difference signals constituting the input video signal. Extraction means for extracting the degree, determination means for determining the hue correction amount and the saturation correction amount respectively determined according to the hue and saturation extracted by the extraction means based on the table, and the two color difference signals The hue correction amount and the saturation correction amount from the determining means and the luminance signal constituting the input video signal are input, and the hue correction amount and the saturation correction amount are adjusted according to the level of the luminance signal, And color correction means for correcting the hue and saturation of the two color difference signals by a matrix processing calculation using the adjusted hue correction amount and saturation correction amount .
In this image processing apparatus, the hue and saturation of the two color difference signals constituting the input video signal are extracted from the input video signal by the extraction unit. Then, the determination unit determines the hue correction amount and the saturation correction amount respectively determined according to the extracted hue and saturation based on the table. Then, Ru this two color difference signals and a luminance signal constituting the hue correction amount and the input video signal of chroma correction amount Toko from the determination means is input to the color correction means. In the color correction means, the hue correction amount and the saturation correction amount are adjusted in accordance with the level of the luminance signal, and the two color difference signals are obtained by matrix processing using the adjusted hue correction amount and saturation correction amount. Are corrected for hue and saturation.
In this manner, the hue and saturation of the two color difference signals constituting the input video signal are extracted, respectively, and the hue correction amount and the saturation correction amount respectively determined according to the extracted hue and saturation are stored in the table. Based on the two hue difference signals and the determined hue correction amount and saturation correction amount, a matrix processing operation is performed, so that a desired hue and saturation portion of the two hue difference signals can be obtained. Any correction can be made according to the hue and saturation.
In addition, since these two color difference signals are corrected based not only on the hue correction amount and the saturation correction amount from the determining means but also on the luminance level of the input video signal, the desired hue and saturation of the video signal can be corrected. The location can be arbitrarily corrected according to not only the hue and saturation but also the luminance level of the video signal.
Incidentally, the extraction means of the image processing apparatus, extraction as an example, the chroma from the vector value extracting color from the arc tangent value corresponding to the ratio of the two color difference signals, corresponding to the level of the two color difference signals What is necessary is just to make it comprise.
In this image processing apparatus, as an example, it is preferable to set the hue correction amount and the saturation correction amount for a plurality of regions having different hues in the table of the determination unit. As a result, correction can be performed for two or more color regions without increasing the circuit scale.
Further, in this image processing apparatus, as an example, it is preferable that the determining means determines the hue correction amount and the saturation correction amount of the input video signal independently of each other based on the table . As a result, the hue and saturation of the video signal can be corrected independently of each other (correcting only the hue, correcting only the saturation, or correcting the hue and saturation by different amounts). Become.
In this image processing apparatus, as an example, the determining means determines the correction amount over a plurality of regions on the color difference plane based on the two color difference signals on the x axis and the y axis based on the table. Is preferred. Thereby, a color region including a portion where the angle with respect to the x axis is 0 °, 90 °, 180 ° or 270 ° on the color difference plane, or a color region having an angle range with respect to the x axis exceeding 90 ° on the color difference plane. It becomes possible to perform correction for.
Next, an image processing method according to the present invention is an image processing method for correcting the hue and saturation of an input video signal, and extracts the hue and saturation of two color difference signals constituting the input video signal. A first step, a second step for determining a hue correction amount and a saturation correction amount respectively determined according to the hue and saturation extracted in the first step based on a table, and the two color difference signals, The hue correction amount and the saturation correction amount determined in the second step and the luminance signal constituting the input video signal are input, and the hue correction amount and the saturation correction amount are adjusted according to the level of the luminance signal. And a third step of correcting the hue and saturation of the two color difference signals by a matrix processing calculation using the adjusted hue correction amount and saturation correction amount .
According to this image processing method, the hue and saturation of two color difference signals constituting the input video signal are extracted, respectively, and the hue correction amount and the saturation correction amount respectively determined according to the extracted hue and saturation. Is determined based on the table, and a matrix processing operation of the two hue difference signals and the determined hue correction amount and saturation correction amount is performed to obtain a desired hue and saturation of the two hue difference signals. The location can be arbitrarily corrected according to the hue and saturation.
In addition, since these two color difference signals are corrected based not only on the hue correction amount and saturation correction amount determined according to the extracted hue and saturation, but also on the luminance level of the input video signal, The desired hue and saturation can be arbitrarily corrected according to not only the hue and saturation but also the luminance level of the video signal.
According to the present invention, the hue and saturation of the two color difference signals constituting the input video signal are extracted, respectively, and the hue correction amount and the saturation correction amount respectively determined according to the extracted hue and saturation are obtained. A location of a desired hue and saturation of the two color difference signals is determined by performing matrix processing calculation of the two hue difference signals and the determined hue correction amount and saturation correction amount based on the table. Can be arbitrarily corrected according to the hue and saturation.
In addition, since the two color difference signals are corrected based not only on the hue correction amount and saturation correction amount determined according to the extracted hue and saturation, but also on the luminance level of the input video signal, The desired hue and saturation can be arbitrarily corrected according to the luminance level of the video signal as well as the hue and saturation.
Further, by setting the hue correction amount and the saturation correction amount for a plurality of regions having different hues in the table, it is possible to perform correction for two or more color regions without causing an increase in circuit scale. Can also be obtained.
In addition, by determining the hue correction amount and the saturation correction amount of the input video signal independently of each other based on the table, the hue and saturation of the video signal are corrected independently of each other (correcting only the hue). Or correcting only the saturation or correcting the hue and the saturation by different amounts).
Further, by determining a correction amount over a plurality of regions on the color difference plane taking the two color difference signals on the x axis and the y axis based on the table, the angle with respect to the x axis on this color difference plane is 0 °, 90 °. There is also an effect that correction can be performed for a color region including a portion where the angle is 180 °, 270 °, or a color region having an angle range with respect to the x axis exceeding 90 ° on the color difference plane.
Hereinafter, the present invention will be specifically described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of an image processing apparatus to which the present invention is applied. This image processing apparatus is provided in a digital television broadcast receiving apparatus, and a digital video signal subjected to processing such as digital demodulation, error correction, demultiplexing, and decoding by frequency selection by a tuner (not shown) is provided. Are input to the image input unit 1.
When the video signal RGB of the three primary colors is input, the image input unit 1 converts the video signal RGB into a component signal YCbCr, and separates the luminance signal Y and the color difference signals Cb and Cr from the component signal YCbCr. It is a circuit to output. (When the component signal YCbCr is input, the luminance signal Y and the color difference signals Cb and Cr are simply separated from the component signal YCbCr and output.)
The color difference signals Cb and Cr output from the image input unit 1 are sent to the color extraction unit 2 and the color correction unit 4. The luminance signal Y output from the image input unit 1 is sent to the color correction unit 4.
The color extraction unit 2 is a circuit that extracts hue and saturation from input color difference signals Cb and Cr. FIG. 2 shows the configuration of the color extraction unit 2. The color extraction unit 2 includes a calculation unit 11, an LUT (lookup table) 12, and a calculation unit 13. The color difference signals Cb and Cr input to the color extraction unit 2 are sent to the calculation unit 11 and the calculation unit 13.
The calculation unit 11 is an arithmetic circuit that calculates a ratio Cr / Cb of the level of the color difference signal Cr to the level of the color difference signal Cb for each pixel clock with respect to the input color difference signals Cb and Cr. A signal indicating the ratio Cr / Cb calculated by the calculation unit 11 is sent to the LUT 12.
The LUT 12 includes a ROM that stores the ratio Cr / Cb value and the arc tangent Cr / Cb value in association with each other, and the arc tangent Cr corresponding to the input ratio Cr / Cb value for each pixel clock. A signal θ indicating the value of / Cb is read from this ROM and output.
FIG. 3 shows the value θ1 of the output signal θ of the LUT 12 when the color difference signals Cb and Cr are at certain levels Cb1 and Cr1, respectively, on the color difference plane where the color difference signals Cb and Cr are taken on the x axis and the y axis, respectively. FIG. As illustrated in FIG. 3, the output signal θ of the LUT 12 represents the hue of the input video signal to the image processing apparatus.
The calculation unit 13 is an arithmetic circuit that calculates the size of the vector (Cb, Cr) on the color difference plane of FIG. 3 for each pixel clock from the input color difference signals Cb, Cr. The signal Sa shown is output. As shown in FIG. 3, when the color difference signals Cb and Cr are level Cb1 and Cr1, respectively, the magnitude Sa1 of the vector (Cb1 and Cr1) is calculated by the calculation unit 13. As illustrated in FIG. 3, the output signal Sa of the calculation unit 13 represents the saturation of the input video signal to the image processing apparatus.
As shown in FIG. 1, the color extraction unit 2 sends the output signal θ of the LUT 12 and the output signal Sa of the calculation unit 13 (signals indicating the hue and saturation of the input video signal) to the color correction amount determination unit 3. It is done.
The color correction amount determination unit 3 is a circuit that determines a correction amount according to the hue and saturation extracted by the color extraction unit 2 by referring to a correction amount lookup table in factory settings. For example, for an input video signal in a hue range corresponding to a flesh color, the hue correction amount is slightly reddish, and at the same time, the correction amount is conspicuous by slightly increasing the saturation. Also, a plurality of correction amount lookup tables may be provided so that the correction amount can be selected by, for example, user mode switching. FIG. 4 shows the configuration of the color correction amount determination unit 3. The color correction amount determination unit 3 includes a correction amount calculation unit 14 and a correction amount calculation unit 15. Both the signal θ and the signal Sa input to the color correction amount determination unit 3 are sent to the correction amount calculation unit 14 and the correction amount calculation unit 15.
The correction amount calculation unit 14 refers to, for example, a correction amount lookup table for each pixel clock from the value of the signal θ and the value of the signal Sa, thereby correcting the hue correction amount for the input video signal to the image processing apparatus. It is an arithmetic circuit that determines (amount of increase / decrease relative to the original hue), and outputs a signal Δθ indicating the determined correction amount.
The correction amount calculation unit 15 refers to, for example, a correction amount lookup table for each pixel clock from the value of the signal θ and the value of the signal Sa, thereby correcting the saturation for the video signal input to the image processing apparatus. This is an arithmetic circuit that determines the amount (magnification with respect to the original saturation), and outputs a signal Sg indicating the determined correction amount. An image processing apparatus to which the present invention is applied is an image processing apparatus that corrects the hue and saturation of an input video signal in real time, and includes a color extraction unit 2, a color correction amount determination unit 3, and a color correction shown in FIG. The processing of the unit 4 is performed in real time.
FIG. 5 shows that when the value of the signal Sa is a fixed value, the value of the signal Δθ calculated by the correction amount calculation unit 14 and the value of the signal Sg calculated by the correction amount calculation unit 15 are It is a figure which shows a mode that it changes with the change of a value. When the fixed values are different values, the values of these signals Δθ and Sg can be different.
As shown in FIG. 5A, the value of the signal Δθ calculated by the correction amount calculation unit 14 (hue correction amount) includes a portion where the angle with respect to the x-axis is 90 ° on the color difference plane of FIG. In the color region A1, the increase / decrease amount is positive. In this color difference plane, the increase / decrease amount is negative in the color region A2 (the color region where the angle range with respect to the x axis exceeds 90 °) including the location where the angle with respect to the x axis is 180 ° and the location where the angle is 270 °. . In other color regions, the increase / decrease amount is set to zero.
As shown in FIG. 5B, the value of the signal Sg (saturation correction amount) calculated by the correction amount calculation unit 15 is a point where the angle with respect to the x axis is 90 ° on the color difference plane of FIG. In the including color region A3, the magnification is set to be larger than 1. In addition, the magnification is less than 1 in the color region A4 including a portion where the angle with respect to the x axis is 180 ° on the color difference plane. In other color areas, the magnification is set to 1.
In this way, in the color correction amount determination unit 3, the correction amount calculation unit 14 and the correction amount calculation unit 15 determine the hue correction amount and the saturation correction amount of the input video signal independently of each other.
Further, as illustrated in FIG. 5, the correction amount calculation unit 14 and the correction amount calculation unit 15 respectively correct the correction amount over the entire angle range (0 ° to 360 °) on the color difference plane illustrated in FIG. 3. And the amount of correction is determined so that the input video signal is corrected in a plurality of regions having different hues (two regions A1, A2, A3, and A4 in FIG. 5).
As shown in FIG. 1, the color correction amount determination unit 3 sends a signal Δθ indicating the hue correction amount and a signal Sg indicating the saturation correction amount to the color correction unit 4.
The color correction unit 4 is a circuit that corrects an input video signal to the image processing apparatus based on the determination result of the correction amount in the color correction amount determination unit 3. FIG. 6 shows the configuration of the color correction unit 4. The color correction unit 4 includes a luminance dependency adjustment unit 16 and a hue / saturation adjustment unit 17. The signal Δθ and the signal Sg input from the color correction amount determination unit 3 to the color correction unit 4 are sent to the luminance dependence adjustment unit 16. As shown in FIG. 1, the luminance signal Y input from the image input unit 1 to the color correction unit 4 is sent to the luminance dependency adjustment unit 16 and is output from the color correction unit 4 as it is.
The luminance dependence adjustment unit 16 is an arithmetic circuit that adjusts the levels of the signals Δθ and Sg according to the level of the luminance signal Y for each pixel clock, and adjusts the signal Δθ2 indicating the correction amount of the adjusted hue. A signal Sg2 indicating the saturation correction amount is output.
FIG. 7 shows a state where the levels of the signal Δθ and the signal Sg illustrated in FIG. 5 are adjusted by the luminance dependence adjusting unit 16 when the level of the luminance signal Y is relatively low. As in the example of FIG. 7, when the level of the luminance signal Y is relatively low (in the case of a dark scene), the luminance dependency adjustment unit 16 prevents the signal Δθ, The level of the signal Sg is suppressed.
The signal Δθ2 and the signal Sg2 output from the luminance dependence adjustment unit 16 are sent to the hue / saturation adjustment unit 17. As shown in FIG. 1, the color difference signals Cb and Cr input from the image input unit 1 to the color correction unit 4 are also sent to the hue saturation adjustment unit 17. The hue / saturation adjustment unit 17 is an arithmetic circuit that performs matrix processing for adjusting the hue and saturation of the color difference signals Cb and Cr for each pixel clock using the signal Δθ2 and the signal Sg2 according to the following equations. The color difference signals Cb2 and Cr2 are output. The matrix processing itself is processing that is generally performed by a television receiver or the like.
As shown in FIG. 1, the color correction unit 4 sends the color difference signals Cb <b> 2 and Cr <b> 2 output from the hue saturation adjustment unit 17 and the luminance signal Y to the image output unit 5. The image output unit 5 converts these color difference signals Cb2, Cr2 and Y into video signals RGB of three primary colors and sends them to a display (for example, a plasma display panel) 6.
As described above, in this image processing apparatus, the hue and saturation are extracted from the input video signal by the color extraction unit 2 in real time. Then, the color correction amount determination unit 3 determines the correction amount according to the extracted hue and saturation in real time. Based on the determination result, the hue and saturation of the input video signal are corrected in real time by the color correction unit 4.
Thus, by extracting the hue and saturation of the input video signal, and determining the correction amount according to the extracted hue and saturation, the desired hue and saturation of the input video signal are determined. Can be arbitrarily corrected in real time according to the hue and saturation.
In addition, since the hue correction amount determination unit 3 determines the hue correction amount and the saturation correction amount of the input video signal independently of each other, the hue and saturation of the video signal are corrected independently of each other (hue) Only correction, correction of saturation, or correction of hue and saturation by different amounts).
In addition, since the color correction amount determination unit 3 determines the correction amount so that the input video signal is corrected for a plurality of regions having different hues, correction is performed for two or more color regions without increasing the circuit scale. It can be carried out.
Further, since the correction amount determination unit 3 determines the correction amount over the entire angle range (0 ° to 360 °) on the color difference plane of FIG. 3, as illustrated in FIG. Correction can also be performed for a color region including a portion where the angle with respect to the axis is 0 °, 90 °, 180 °, or 270 °, or a color region whose angle range with respect to the x-axis exceeds 90 ° on this color difference plane.
In addition, since the color correction unit 4 corrects the input video signal based on not only the determination result of the correction amount determination unit 3 but also the luminance level of the input video signal, a desired hue and saturation portion of the video signal is determined. The correction can be arbitrarily made according to not only the hue and saturation but also the luminance level of the video signal.
In the above example, the calculation unit 13 of the color extraction unit 2 calculates the size of the vector (Cb, Cr) on the color difference plane of FIG. However, in order to calculate the magnitude of the vector (Cb, Cr), square and square root calculations are required. In this embodiment, the video signal is a moving image, and these calculations are performed in real time for each pixel clock. Therefore, the calculation unit 13 may calculate an approximate value of the size of the vector (Cb, Cr) in order to reduce the burden of such calculation processing.
In the above example, the color extracting unit 2 extracts the hue of the input video signal using a lookup table and extracts the saturation of the input video signal using an arithmetic circuit. However, the present invention is not limited to this, and the hue of the input video signal may be extracted using an arithmetic circuit, or the saturation of the input video signal may be extracted using a lookup table. Similarly, the color correction amount determination unit 3 may determine the hue and saturation correction amounts using a lookup table instead of the arithmetic circuit.
In the above example, the present invention is applied to a television broadcast receiver. However, the present invention is not limited to this, and the present invention may be applied to an imaging device such as a television camera, a video recording / reproducing device such as a DVD player, an editing device, and the like.
1 is a block diagram illustrating an overall configuration of an image processing apparatus to which the present invention is applied. It is a block diagram which shows the structure of the color extraction part of FIG. It is a figure which illustrates the hue and saturation which are extracted by the color extraction part. FIG. 2 is a block diagram illustrating a configuration of a color correction amount determination unit in FIG. 1. It is a figure which illustrates the correction amount determined by the color correction amount determination unit. It is a block diagram which shows the structure of the color correction part of FIG. It is a figure which illustrates the process of the brightness | luminance dependence adjustment part of FIG. It is a block diagram which shows the structural example of the conventional color signal extraction circuit. It is a figure which illustrates the color area extracted by the color signal extraction circuit of FIG. FIG. 10 is a diagram illustrating an extracted color signal output from the color signal extraction circuit of FIG. 8 for the color region of FIG. 9. FIG. 10 is a diagram illustrating an example in which a y-axis exists between the half lines b1 and b2 in FIG. 9. It is a figure which shows the example which is going to extract two color area | regions.
DESCRIPTION OF SYMBOLS 1 Image input part 2 Color extraction part 3 Color correction amount determination part 4 Color correction part 5 Image output part 6 Display 11 Calculation part 12 LUT
13 Calculation unit 14 Correction amount calculation unit 15 Correction amount calculation unit 16 Luminance dependence adjustment unit 17 Hue / saturation adjustment unit
An image processing apparatus for correcting the hue and saturation of an input video signal,
Extraction means for extracting hue and saturation of two color difference signals constituting the input video signal;
Determining means for determining a hue correction amount and a saturation correction amount respectively determined according to the hue and saturation extracted by the extraction means based on a table;
Level of the hue correction amount and the saturation correction amount and the input to input a luminance signal constituting the image signal, the hue correction amount and the luminance signal saturation correction amount from said determining means and said two color difference signals And a color correction unit that corrects the hue and saturation of the two color difference signals by matrix processing using the adjusted hue correction amount and saturation correction amount.
The extraction means extracts an hue from an arctangent value corresponding to a ratio of the two color difference signals, and extracts a saturation from a vector value corresponding to the level of the two color difference signals. .
The image processing apparatus according to claim 1, wherein the hue correction amount and the saturation correction amount are set in the table for a plurality of regions having different hues.
The image processing apparatus according to claim 1, wherein the determining unit determines the hue correction amount and the saturation correction amount independently of each other based on the table.
The determination means determines the hue correction amount and the saturation correction amount over a plurality of regions on a color difference plane in which two color difference signals are taken on the x axis and the y axis based on the table. Processing equipment.
An image processing method for correcting the hue and saturation of an input video signal,
A first step of extracting hue and saturation of two color difference signals constituting the input video signal;
A second step of determining a hue correction amount and a saturation correction amount respectively determined according to the hue and saturation extracted in the first step based on a table;
The two color difference signals, the hue correction amount and the saturation correction amount determined in the second step, and the luminance signal constituting the input video signal are input, and the hue correction amount and the saturation correction amount are input to the luminance signal. And a third step of correcting the hue and saturation of the two color difference signals by a matrix processing operation using the adjusted hue correction amount and saturation correction amount.
The image processing method according to claim 6,
In the first step, the hue is extracted from an arctangent value corresponding to the ratio of the two color difference signals, and the saturation is extracted from a vector value corresponding to the level of the two color difference signals. Processing method.
The image processing method, wherein the hue correction amount and the saturation correction amount are set in the table for a plurality of regions having different hues.
The image processing method according to claim 8.
In the second step, the hue correction amount and the saturation correction amount are determined independently from each other based on the table.
In the second step, the hue correction amount and the saturation correction amount are determined over a plurality of regions on a color difference plane in which two color difference signals are taken on the x-axis and the y-axis based on the table. Image processing method.
JP2004300495A 2004-02-19 2004-10-14 Image processing apparatus and image processing method Active JP4042736B2 (en)
JP2004043283 2004-02-19
JP2004300495A JP4042736B2 (en) 2004-02-19 2004-10-14 Image processing apparatus and image processing method
US11/036,998 US7551774B2 (en) 2004-02-19 2005-01-19 Image processing apparatus, and image processing method
KR1020050010313A KR101126492B1 (en) 2004-02-19 2005-02-04 Image processing apparatus, and image processing method
EP05003042A EP1569465A3 (en) 2004-02-19 2005-02-14 Image processing apparatus, and image processing method
CN2005100077714A CN1658678A (en) 2004-02-19 2005-02-17 Image processing apparatus and image processing method
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JP4042736B2 true JP4042736B2 (en) 2008-02-06
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JP2004300495A Active JP4042736B2 (en) 2004-02-19 2004-10-14 Image processing apparatus and image processing method
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JP (1) JP4042736B2 (en)
KR (1) KR101126492B1 (en)
CN (1) CN1658678A (en)
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