JP4211819B2 - Image processing device - Google Patents

Description

  The present invention relates to an image processing apparatus used at a video material editing site.

  In a video material editing site such as a broadcasting station, the color temperature, tone, etc. are adjusted by correcting the signal level of the video signal using a color correction device which is an image processing device.

  The color correction apparatus is configured to be able to perform primary processing and secondary processing, and corrects the signal level of a video signal centered on luminance levels such as white level, black level, and gamma correction by primary processing. Further, the signal level of the video signal centered on the hue formed by the color vector is corrected by the secondary processing.

  At the editing site, these processes correct, for example, variations in color temperature between editing materials recorded at different dates and times. For this reason, while confirming the processing results at the editing site, for example, the characteristics of these processes are set by repeatedly previewing so that variations between materials are hardly understood.

  Such a color correction device includes a device having a hardware configuration created using a gate array and the like, and a device having a software configuration by arithmetic processing. In a broadcasting site where real-time processing is required, the hardware configuration The device by was mainly used.

  By the way, in the conventional color correction apparatus, both the software configuration and the hardware configuration are colors that can be set as processing targets (source vectors, generally six colors of red, green, blue, yellow, cyan, and magenta). ) And the number thereof is limited, and fine hue adjustment is limited accordingly. Furthermore, the adjustment of characteristics such as a correction range and a correction level is limited for these source vectors.

  As a result, the conventional color correction apparatus has a drawback that it cannot execute processing with a high degree of freedom.

JP 05-119752 A Japanese Patent Laid-Open No. 04-321182 Japanese Patent Laid-Open No. 02-309887 JP 09-186907 A

  Therefore, the present invention has been made in view of the conventional situation as described above, and an object of the present invention is to provide an image processing apparatus capable of executing processing with a high degree of freedom by a simple operation. .

An image processing apparatus according to the present invention includes a primary processing unit that performs processing for correcting a signal level of a video signal centered on a luminance level on luminance data and color difference data of an input video signal, and a source of the video signal A primary lookup unit having a first lookup table for holding correction data corresponding to a color difference signal of a vector and a second lookup table for holding correction data corresponding to a luminance level of a source vector of the video signal; A secondary processing unit that performs a process of correcting the signal level of the video signal centered on the hue on the luminance data and the color difference data that have been subjected to the processing according to the above, and the contents of the first and second lookup tables of the secondary processing unit And the secondary processing unit is sequentially input from the primary processing unit. The color difference data is converted into hue and saturation data, the video signal is expressed in a polar coordinate format on the color plane, and the hue data generated by the coordinate conversion circuit is used as an address, and the video signal The first look-up table for outputting hue and saturation correction data as correction data corresponding to the color difference signal of the source vector of the video signal, and the saturation data generated by the coordinate conversion circuit include the first A first multiplication circuit for multiplying the saturation correction data output from the look-up table, and correction data consisting of one axis component in the orthogonal coordinate system of the hue output from the first look-up table. The saturation data multiplied by the correction data from the first multiplication circuit is multiplied, and the multiplication output is the destination vector. The correction data from the first multiplication circuit to the second multiplication circuit that outputs as one hue data and the correction data that is the other axis component in the orthogonal coordinate system of the hue that is output from the first lookup table. A third multiplication circuit that multiplies the saturation data multiplied by, and outputs the multiplication output as the other hue data of the destination vector, and the hue generated by the coordinate conversion circuit as an address, and the video The second look-up table for outputting gain and offset amount data as correction data corresponding to the luminance level of the source vector of the signal, and the second look-up table for the luminance data sequentially input from the primary processing unit. A fourth multiplication circuit for multiplying the gain data output from the second multiplication circuit and the fourth multiplication circuit. And an addition circuit for adding the offset amount data output from the second look-up table to the luminance data multiplied by the obtained data and outputting the addition output as luminance data of the destination vector. To do.

In the image processing apparatus according to the present invention , the coordinate conversion circuit of the secondary processing unit outputs the angle data with a larger number of bits than the color difference signal , for example.

In the image processing apparatus according to the present invention, the control unit includes at least input hue and saturation to be processed, and hue and saturation to be processed, hue and saturation to be processed, and Stored in the first look-up table so that the hue and saturation of the processing target in the video signal are corrected to the hue and saturation of the processing target based on the hue and saturation of the processing target. Data generating means for generating data.

  According to the present invention, image processing with a high degree of freedom can be executed with a simple operation.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  The present invention is applied to an editing apparatus 100 configured as shown in FIG. 1, for example. The editing apparatus 100 shown in FIG. 1 performs editing of a video signal conforming to the serial digital interface (SDI) of the SMPTE 259M specification, and includes a computer 10, a hard disk device 20, and image processing connected via a local bus BUS. It consists of a device 30.

The computer 10 functions as a system controller for controlling the editing apparatus 100 as a whole, and includes a central processing unit (CPU) 11, a random access memory (RAM) 12, and a read only memory connected via an internal bus BUS _INT. (ROM) 13 and a monitor device 14 are provided. A keyboard 16 and a mouse 17 are connected to the internal bus BUS _INT of the computer 10 via an interface (I / F) 15.

  The hard disk device 20 is for temporarily storing a video signal that complies with the serial digital interface (SDI) of the SMPTE 259M specification edited by the editing device 100. It comprises a disk unit controller 21 to which a control command is given via BUS, and a hard disk array 22 controlled by this disk unit controller 21. The hard disk device 20 can store a 2-channel input signal in the hard disk array 22 and output a signal read from the hard disk array 22 in 3 channels. The source video signal, which is the video material, and the image-processed video signal output from the image processing apparatus 30 are input. The hard disk device 20 accumulates the source video signal and the image-processed video signal output from the image processing device 30 in the hard disk array 22 and responds to a control command given via the local bus BUS. Then, the hard disk array 22 is controlled by the disk unit controller 21 so as to output video signals of three channels from the hard disk array 22.

  Further, the image processing device 30 is for performing special image effect processing and color correction processing on the video signal edited by the editing device 100, and is provided with a control command given via the local bus BUS. The unit controller 31 includes a cross point switch 32 controlled by the image processing unit controller 31, a special effect processing unit 33, a mixer unit 34, a color corrector unit 35, and the like.

  In the image processing apparatus 30, the cross point switch 32 is a matrix switcher having at least 6 channel input lines and 7 channel output lines, and includes a 3-channel video signal output from the hard disk device 20, and A 6-channel video signal consisting of a 2-channel video signal output from the mixer section 34 and a 1-channel video signal output from the color collector section 35 is supplied to the 6-channel input line as an input signal. It has become. Further, the output line of the cross point switch 32 is as follows: 1 channel is an output line for a monitor video signal, 2 channel is an output line for a video signal after image processing, 3 channel is an output line for a special effect processing unit 33, 1 channel Are assigned as output lines to the color corrector. The monitor video signal output line is connected to the image processing unit controller 31. As a result, the image processing unit controller 31 supplies a monitor video signal from the output line to the monitor device 14 of the computer 10 via the bus BUS. Further, the output line of the video signal after the image processing of the two channels is used as an output line for supplying the edited video signal to the recording device or the like of the subsequent stage, and the other one channel. Are connected to the hard disk device 20. As a result, the image processing device 30 supplies the video signal that has undergone image processing to the hard disk device 20 via the output line. Further, a three-channel video signal is supplied to the special effect processing unit 33 via a three-channel output line to the special effect processing unit 33. Further, a one-channel video signal is supplied to the color corrector 35 via a one-channel output line to the color corrector 35.

  The special effect processing unit 33 performs special effect processing on the three-channel video signal supplied via the cross point switch 32, and converts the video signal having undergone the special effect processing from the mixer unit 34 to the cross point. The signal is supplied to the input line of the switch 32.

  Further, the color corrector 35 includes a demultiplexer (DEMUX) 36 to which a video signal compliant with the serial digital interface (SDI) of the SMPTE 259M specification is input via the cross point switch 32, and the demultiplexer 36. From a primary processing unit 37 to which an output signal is supplied, a secondary processing unit 38 to which an output signal of the primary processing unit 37 is supplied, and a multiplexer (MUX: Multiplexer) 39 to which an output signal of the secondary processing unit 38 is supplied Become.

  In the color corrector 35, the demultiplexer 36 converts a video signal compliant with the serial digital interface (SDI) of the SMPTE259M specification input via the crosspoint switch 32 into luminance data Y and color difference data U and V. To do. The primary processing unit 37 corrects the signal level of the video signal centered on the luminance level such as white level, black level, and gamma correction on the luminance data Y and the color difference data U and V obtained by the demultiplexer 36. Process to do. Further, the secondary processing unit 38 performs processing for correcting the signal level of the video signal centered on the hue on the luminance data Y and the color difference data U and V processed by the primary processing unit 37. The multiplexer 39 converts the luminance data Y and the color difference data U and V processed by the primary processing unit 37 and the secondary processing unit 38 into a video signal conforming to the serial digital interface (SDI) of the SMPTE259M specification. And output it.

  As shown in FIG. 2, the primary processing unit 37 has oversampling circuits 41U and 41V, a first matrix circuit 42, look-up tables (LUTs) 43R, 43G, 43B and the second matrix circuit 44.

  In the primary processing unit 37, the oversampling circuits 41U and 41V oversample the color difference data U and V obtained by the demultiplexer 36 at the sampling frequency of the luminance data Y, thereby obtaining the color difference data U and V. It is supplied to the first matrix circuit 42 in synchronization with the luminance data Y.

  Further, the luminance data Y obtained by the demultiplexer 36 is directly input to the first matrix circuit 42, and the color difference data U synchronized with the luminance data Y via the oversampling circuits 41U and 41V. , V are input. The first matrix circuit 42 performs a matrix operation on the synchronized luminance data Y and color difference data U and V, thereby converting the luminance data Y and color difference data U and V into red, green and blue colors. Convert to color data R, G, B.

Further, the look-up tables 43R, 43G, and 43B store in advance the output signal level data for each signal level calculated by the central processing unit 11 of the computer 10 to the image processing unit controller 31 via the bus BUS. It is formed by accumulating this data and outputs the color data R, G, B of the corresponding signal level by using the signal level of each color data R, G, B as an address. The look-up tables 43R, 43G, and 43B are for color data R, G, and B that are sequentially output from the first matrix circuit 42.
OUT = ((WL−BL) × IN) ^{1 / γ} + BL (1) The arithmetic processing of equation (1) is executed, and the signal level of these color data R, G, B is corrected by the characteristic curve set in advance by the operator. Output.

  In equation (1), IN is an input level, OUT is an output level relative to the input level IN, IN is input data, BL is a black level, WL is a white level, and γ is a gamma correction value.

  The second matrix circuit 44 performs a matrix operation on the color data R, G, and B output from the lookup tables 43R, 43G, and 43B, thereby converting the color data R, G, and B into luminance data Y. , Converted into color difference data U and V and output.

  Here, the central processing unit (CPU) 11 provided in the computer 10 secures a work area in the random access memory (RAM) 13 and responds to the operation of the keyboard 16 and the mouse 17 to read only memory ( The operation of the editing apparatus 100 is controlled by executing a series of processing procedures stored in a ROM 12 or a hard disk device (not shown).

  In this control, when the operator designates processing using the color corrector unit 35 of the image processing device 30, the central processing unit 11 sends a control command to the image processing unit controller 31 of the image processing device 30, and the above processing is performed. The operation of the color corrector 35 is started. Further, the central processing unit 11 accepts the processing conditions when the operator instructs the setting of the processing conditions in this state, and executes the parameter setting processing of the color corrector unit 35 according to the accepted conditions.

  At this time, the central processing unit 11 accepts setting of processing conditions through a GUI (Graphical User Interface) displayed on the monitor device 14. That is, when the menu for setting conditions relating to white level, black level, and gamma correction in the primary processing is selected, the central processing unit 11 has red, blue, green, as shown in FIG. For each of the color signals, a characteristic curve L1 indicating the relationship between the input signal level IN and the output signal level OUT is displayed. In FIG. 3A, a characteristic curve is shown only for one color signal, and description of other color signals is omitted.

  Further, the central processing unit 11 displays a plurality of points P0, P1,... On the characteristic curve L1 at a predetermined interval. In such a characteristic curve L1, the start point P0 and the end point P4 of the plurality of points P0, P1,... Represent the black level BL and the white level WL, respectively, and the curve of the curve L1 represents gamma γ. become.

  The central processing unit 11 responds to the operation of the operator by the default black level BL, white level WL, gamma γ, or by the black level BL, white level WL, gamma γ recorded in a predetermined storage means. By executing the arithmetic processing of the above-described equation (1), the output level OUT with respect to the input level IN is sequentially calculated, and this characteristic curve L1 is displayed based on the calculation result.

  In this state, as indicated by reference symbol A, when the operator grabs and moves the start point P0 or the end point P4 with the mouse 17, the calculation processing of the expression (1) is performed based on the coordinate values of the moved start point P0 and end point P4. As a result, the change of the black level BL and the white level WL is accepted, and the characteristic curve is displayed by the changed black level BL and the white level WL as indicated by reference numeral L2. When the operator grabs and moves the intermediate points P1, P2, and P3, the calculation processing of the expression (1) is executed with reference to the coordinate values of the moved points P1, P2, or P3 and the start point P0 and the end point P4. As a result, a change in gamma γ is accepted and a characteristic curve by this gamma γ is displayed.

  Thus, the central processing unit 11 can set various input / output characteristics in response to the operation of the operator. The central processing unit 11 forms a display screen so that other numerical values can be received for the black level BL, white level WL, and gamma γ, and the display of the characteristic curve is also changed by this numerical input. It is made to do.

  Further, the central processing unit 11 sequentially calculates the output signal level with respect to the signal level that can be taken by the video signal based on the black level BL received in this way. At this time, the central processing unit 11 assigns 8-bit data to the input level IN for each color signal of red, blue, and green, and sequentially switches the 8-bit input level IN to perform the arithmetic processing of the expression (1). As a result, the output level OUT is sequentially calculated from 8-bit data corresponding to the input level IN.

  Further, the central processing unit 11 sends and sets these calculation results to the image processing unit controller 31 of the image processing apparatus 30, and sets the lookup tables 43R, 43G, and 43B according to the set input / output characteristics as the primary processing. Created in part 37. Further, the color collector unit 35 processes the image using the set look-up tables 43R, 43G, and 43B.

  In setting the input / output characteristics, the central processing unit 11 forms a window W1 to display the characteristic curve L1 as shown in FIG. 3B, and further performs processing according to conditions set by the operator. The previous and next images are displayed in the other windows W1 and W2, respectively.

  At this time, the central processing unit 11 switches the display of the characteristic curve L2 in response to the operation of the operator, and repeats the setting work of the lookup tables 43R, 43G, 43B of the primary processing unit 37. Thus, the condition of the primary process can be changed interactively by operating the mouse 17 while checking the processing result on the monitor device 14.

  Here, the primary processing unit 37 of the color corrector unit 35 performs the primary processing with the gamma value set to 2.51 on the over-iris-like source video image as shown in FIG. FIG. 6 shows the result of primary processing with the gamma value set to 0.79, and FIG. 7 shows the result of primary processing with the gamma value set to 0.32. For the source video image shown in FIG. 4, in the primary process set to the gamma value of 2.51, the processing result of the over iris state is obtained, and in the primary process set to the gamma value of 0.79, the process of the proper iris state is obtained. A result was obtained, and further, in the primary processing set to a gamma value of 0.32, a processing result in a low iris state was obtained. Thus, the primary processing unit 37 of the color corrector unit 35 can freely set gamma and obtain a natural processing result.

  FIG. 8 shows the result of primary processing with the white level set to 127 gradations for the source video image shown in FIG. 4, and the result of primary processing with the black level set to 127 gradations. FIG. 9 shows the result of primary processing with the white level and black level set to 0 gradation and 255 gradation, and FIG. 10 shows the result of primary processing, and the white level and black level are set to 0 gradation only for red color data. The result of the primary processing is shown in FIG. As is apparent from FIGS. 8 to 10, the primary processing unit 37 of the color corrector unit 35 corrects the signal level without causing any inconveniences such as image quality degradation by changing the gradation significantly. can do. As is apparent from FIG. 11, the primary processing unit 37 of the color corrector unit 35 can also obtain a red achromatizing effect.

  In the editing apparatus 100, the secondary processing unit 38 includes, for example, a secondary including a coordinate conversion circuit 51, a lookup table 52, and addition circuits 54Y, 54U, and 54V, as shown in a specific configuration example in FIG. A processing unit 50 is used.

In the secondary processing unit 50, the coordinate conversion circuit 51 is supplied with the color difference data U and V output from the primary processing unit 37. The coordinate conversion circuit 51 performs color difference data U and V that are sequentially input,
θ = arctan (V / U) The calculation processing of the equation (2) is executed, thereby converting the color difference data U and V into data of hue θ.

  The look-up table 52 stores in advance total correction value data ΣΔY, ΣΔU, ΣΔV corresponding to each θ (0 ° ≦ θ ≦ 360 °) calculated by the central processing unit 11 of the computer 10. It is a memory for. This look-up table 52 outputs the total correction value data ΣΔY, ΣΔU, ΣΔV of the corresponding source vector using the hue θ data obtained by the coordinate conversion circuit 51 as an address.

Then, the addition circuits 54Y, 54U, 54V are integrated correction values read from the lookup table 52 into the source color luminance data Y _s and color difference data U _s , V _s output from the primary processing unit 37. By adding the data ΣΔY, ΣΔU, and ΣΔV, the destination color luminance data Y and the color difference data U and V are generated.

  Here, the principle of the correction process in the secondary processing unit 50 having the configuration shown in FIG. 12 will be described.

In the correction processing in the secondary processing unit 50, the total correction value data ΣΔY, ΣΔU, ΣΔV calculated corresponding to the hue (0 ° ≦ θ ≦ 360 °) formed by the input signals U, V are input to the input signals Y _s , U _The method of adding to _s and V _s is adopted, and the relationship between the input (Y _s , U _s , V _s ) and the output (Y _d , U _d , V _d ) is
Y _d = Y _s + ΣΔY
U _d = U _s + ΣΔU (3) Formula V _d = V _s + ΣΔV
Indicated by. Y _s , U _s , and V _s are the luminance level and each color difference level of the source vector. Y _d , U _d , and V _d are the luminance level and each color difference level of the destination vector.

Here, the total correction data ΣΔY, ΣΔU, and ΣΔV will be described. The color corrector apparatus according to the present invention sets not only one source vector but also arbitrary 1 to n source vectors and arbitrary n destination vectors respectively associated with the n source vectors. It is configured to be able to. Therefore, the accumulated correction data ΔY _{1 to} ΔY _n of the luminance components corresponding to the first to nth source vectors are defined as total correction data ΣΔY related to the luminance components, and the first to nth source vectors are defined. correction data of the corresponding color component .DELTA.U ₁ what all of accumulating ～DerutaU _n is defined as the total correction data ΣΔU for this color component, correction data [Delta] V ₁ color component corresponding to the source vector of the first to n those all ～DerutaV _n and accumulated is defined as the total correction data ΣΔV for this color component.

Therefore, the relationship between individual correction data and total correction data is
ΔY = ΔY ₁ + ΔY ₂ +... + ΔY _n
ΔU = ΔU ₁ + ΔU ₂ +... + ΔU _n (4) Equation ΔV = ΔV ₁ + ΔV ₂ +... + ΔV _n
It can be expressed as

First, in order to obtain the total correction data ΣΔY related to the luminance component, attention is focused on the luminance component Y _s of the source vector and the luminance component Y _d of the first destination vector associated with the source vector.

Here, of the n vectors set by the operator, the luminance component of the first source vector is Y _s1, and the first destination vector is Y _d1 . Further, the correction data for correcting the luminance component of the first source vector to the luminance component of the first destination vector and [Delta] Y _1, any weighting function set for this first source vector K ₁ (θ), the relationship between Y _s1 , Y _d1 , ΔY ₁ and K ₁ (θ) is
ΔY ₁ = K ₁ (θ) × (Y _d1 −Y _s1 ) (5)

The weighting function K ₁ (θ) will be described later in detail.

As already described, since the color corrector apparatus of the present invention is configured to be able to set n source vectors and destination vectors, the correction data ΔY ₁ related to the first source vector is obtained. Thinking like equation (5), for all source and destination vectors up to n,
ΔY ₁ = K ₁ (θ) × (Y _d1 −Y _s1 )
ΔY ₂ = K ₂ (θ) × (Y _d2 −Y _s2 )
ΔY ₃ = K ₃ (θ) × (Y _d3 −Y _s3 ) (6)
...
ΔY _n = K _n (θ) × (Y _dn −Y _sn )
It can be seen that the relational expression

Therefore, substituting ΔY ₁ to ΔY _{1n of} equation (6) into equation (4),
ΣΔY = ΔY ₁ + ΔY ₂ +... + ΔY _n
= K ₁ (θ) × (Y _d1 −Y _s1 ) + K ₂ (θ) × (Y _d2 −Y _s2 )
+ ...
+ K _n (θ) × (Y _dn −Y _sn ) (7)

In the same manner as the calculation for obtaining the luminance component, the total correction data ΣΔU, ΣΔV related to the color components U, V is obtained in the same way as the calculation of the equation (7), and the source vector color components U _s , V _s and the destination vector color components Focusing on U _d and V _d , as in equation (7),
ΣΔU = ΔU ₁ + ΔU ₂ +... + ΔU _n
= K ₁ (θ) × (U _d1 −U _s1 ) + K ₂ (θ) × (U _d2 −U _s2 )
+ ...
+ K _n (θ) × (U _dn −U _sn ) (8) Equation ΣΔV = ΔV ₁ + ΔV ₂ +... + ΔV _n
= K ₁ (θ) × (V _d1 −V _s1 )
+ K ₂ (θ) × (V _d2 −V _s2 )
+ ...
+ K _n (θ) × (V _dn −V _sn ) (9) holds.

  Based on these equations (7), (8), and (9), the central processing unit 11 determines the total correction data ΣΔY for every 1 ° with respect to θ having a value of 0 ° to 360 °. , ΣΔU and ΣΔV are calculated. That is, 360 total correction data ΣΔY, ΣΔU, and ΣΔV corresponding to all angles are generated. The calculated total correction data ΣΔY, ΣΔU, and ΣΔV are stored in the lookup table 52 so as to be addressed by each angle θ.

Next, the weighting function K (θ) described above will be described. This weighting function K (θ) is a function for setting the gain of the correction value in each source vector. Similar to the correction data described above, the function is set for each source vector. Therefore, when the first to nth source vectors are set, the first to nth weighting functions K _{1 are set.} (Θ) to K _n (θ) exist.

  As parameters of this weighting function K (θ), hue range data W indicating the weighting range and gain level data G are set. The weighting function K (θ) is determined according to the set hue range data and the gain level.

The setting of the first weighting function K ₁ (θ) set for the first source vector SV ₁ will be described below as an example with reference to FIGS. 13A and 13B. FIG. 13B shows a color space expressed by a two-dimensional vector scope. Example shown in (B) of FIG. 13, the color of a point P _s1 represented by the first source vector SV ₁ is converted into the color of the point P _d1 represented by a first destination vector DV ₁ It is an example showing that.

Further, as shown in (A) of FIG. 13, the hue range data theta _w is data that has been set to be the first hue angle theta _s1 center of the source vector SV _1. The gain of the first weighting function K ₁ (θ) is “1” at the hue angle θ _s1 of the first source vector, and the gain is “0” at the hue angles θ _s1 −θ _w / 2 and θ _s1 + θ _w / 2. Is a function such as

That is, this function K ₁ (θ) is in the range of θ _s1 −θ _w / 2 ≦ θ <θ _s1 .

In the range of θ _s1 ≦ θ ≦ θ _s1 + θ _w / 2,

In addition, when θ> θ _s1 −θ _w / 2 and θ _s1 + θ _w / 2 <θ,
K (θ) = 0 (12).

  Next, how the color is converted when this first weighting function is used will be described with reference to FIGS.

In FIG. 13, the color of the point P _s1 represented by the first source vector SV ₁ is converted to the color of the point P _d1 represented by the _first destination vector DV ₁ , and the set hue range data θ _w The color of the point P _s1 ′ in the vicinity of the first source vector SV ₁ is converted to the point P _d1 ′, and the point P _s1 away from the first source vector SV ₁ in the set hue range data θ _w The color "" is converted to the point _Pd1 ".

The coordinates of each point are
P _s1 (Y _s1 , U _s1 , V _s1 )
P _d1 (Y _s1 + ΔY ₁ (θ _s ),
U _s1 + ΔU ₁ (θ _s ),
V _s1 + ΔV ₁ (θ _s )) (13) Expression P _s1 ′ (Y _s1 ′, U _s1 ′, V _s1 ′)
P _d1 ′ (Y _s1 ′ + K (θ ′) × ΔY ₁ (θ _s ),
U _s1 ′ + K (θ ′) × ΔU ₁ (θ _s ),
V _s1 ′ + K (θ ′) × ΔV ₁ (θ _s )) (14) Expression P _s1 ″ (Y _s1 ″, U _s1 ″, V _s1 ″)
P _d1 ″ (Y _s1 ″ + K (θ ″) × ΔY ₁ (θ _s ),
U _s1 ″ + K (θ ″) × ΔU ₁ (θ _s ),
V _s1 ″ + K (θ ″) × ΔV ₁ (θ _s )) (15).

As can be understood from FIG. 13A, the value of the weighting function K (θ ′) increases as the point P _s1 ′ is closer to the _first source vector SV ₁ . Further, as can be understood from the equation (14), the point P _d1 ′ of the conversion destination is obtained by multiplying the correction data ΔY ₁ (θ _s ) from the source vector to the destination vector by the weighting function K (θ ′). The position of is determined. That is, as the point P _s1 ′ is closer to the first source vector SV ₁ , that is, as θ ′ is closer to θ _s , the point P _d1 ′ to which the point P _s1 ′ before conversion is converted is Close to the destination vector.

As a result, not only a pixel having a color on the source vector but also a pixel having a color around the source vector such as the point P _s1 ′ can be converted. In addition, when the color corrector converts the color of the point P _s1 ′ close to the source vector by using the weighting function K (θ) with the hue angle θ as a function, the conversion destination point P _d1 ′ Is not converted to a color on the destination vector, but becomes an intermediate color between the color on the destination vector and the color of the point P _s1 ′ before conversion, so that more natural color conversion can be realized.

On the other hand, as can be understood from FIG. 13A, the value of the weighting function K (θ ″) decreases as the point P _s1 ″ moves away from the first source vector. Further, as can be understood from the above equation (15), the point P of the conversion destination is obtained by multiplying the correction data ΔY ₁ (θ _s ) from the source vector to the destination vector by the weighting function K (θ ″). The position of _d1 ″ is determined. Therefore, the further away the point P _s1 ″ is from the first source vector SV ₁ , that is, the further away θ ″ is from θ _{s, the} more the point P _d1 ″ to be converted becomes the point P _s1 ″ before conversion. Close to.

That is, the fact that the point P _d1 ″ at the conversion destination is close to the point P _s1 ″ before the conversion means that the color of the point P _s1 ″ is not greatly changed by the color correction process. When the collector device converts the color of the point P _s1 ″ away from the source vector by using the weighting function K (θ) having the hue angle θ as a function, the color of the point P _s1 ″ _Is converted into the color of the point P _d1 ″ close to this point itself, so that more natural color conversion can be realized.

  The weighting function K (θ) is not limited to the function as shown in FIG. 13A, and the weighting function as shown in FIGS. 14A and 14B according to the image to be converted. May be used.

  The secondary processing unit 50 having the configuration shown in FIG. 12 used as the secondary processing unit 38 of the color corrector unit 35 performs saturation 71 and hue 115 ° (luminance level 107) on the source video image as shown in FIG. (Gradation) is designated as the source vector, the result of the secondary processing by setting the hue of 87 degrees as the destination vector is shown in FIG. 16, and the result of the secondary processing by setting the hue of 308 ° as the destination vector is shown in FIG. Further, FIG. 18 shows the result of the secondary processing with the hue 222 ° set as the destination vector. As apparent from FIGS. 15 to 18, according to the secondary processing unit 50, the hue can be greatly changed without accompanying an unintended hue change.

  Further, as the secondary processing unit 38 of the color collector unit 35 in the image processing apparatus 30, for example, a color collector unit 60 configured as shown in FIG. 19 is used instead of the color collector unit 50 configured as shown in FIG. May be used.

  The secondary processing unit 60 shown in FIG. 19 includes a coordinate conversion circuit 61, first and second look-up tables 62 and 63, first to fourth multiplication circuits 64, 65, 66 and 67, and an addition circuit 68. Become.

In the secondary processing unit 60, the coordinate conversion circuit 51 is supplied with color difference data U and V output from the primary processing unit 37. The coordinate conversion circuit 37 is configured to obtain color difference data U and V that are sequentially input.
θ = arctan (V / U)
r = U / cos θ (16)
= (U ² + V ² ) ^1/2
The color difference data U and V are converted into data of hue θ and saturation r by executing the above calculation process. Accordingly, the secondary processing unit 60 expresses sequentially input video signals in a polar coordinate format on the color plane. At this time, the first coordinate conversion circuit 61 generates 14-bit hue θ data and 11-bit saturation r data from the 10-bit color difference data U and V, respectively. This ensures a sufficient resolution in subsequent processing. The hue θ data generated by the coordinate conversion circuit 61 is supplied to the lookup tables 62 and 63, and the saturation r data is supplied to the first multiplication circuit 64.

  The first look-up table 62 is formed by accumulating total correction data ΣΔR, ΣΔX, ΣΔY calculated by the central processing unit 11 of the computer 10 in advance, and calculated by the coordinate conversion circuit 61. The corresponding total correction data ΣΔR, ΣΔX, ΣΔY is output to the first to third multiplication circuits 64, 65, 66 by using the hue θ as an address.

  The first multiplication circuit 64 multiplies the saturation r calculated by the coordinate conversion circuit 61 by correction data ΔR of the saturation r output from the first lookup table 62, and outputs the multiplication output. This is supplied to the second and third multiplication circuits 65 and 66.

The second multiplication circuit 65 also outputs the saturation data output from the first multiplication circuit 64 to the correction data ΔX consisting of the U-axis component of the hue θ vector output from the first look-up table 62. Multiply by r. Further, the first multiplication circuit 66 has correction data ΔY composed of the V-axis component of the hue θ vector output from the first look-up table 62 with the saturation r output from the first multiplication circuit 64. Is multiplied by the saturation r output from the first multiplication circuit 64. As a result, the second and third multiplication circuits 65 and 66 output the multiplication outputs as destination vector color data U _d and V _d .

  The second look-up table 63 is formed by accumulating the overall gain ΣΔGAIN and offset amount ΣΔOFF of the luminance level for each hue θ calculated by the central processing unit 11 in advance. Using the hue θ output from the coordinate conversion circuit 61 as an address, the gain ΣΔGAIN and the offset amount ΣΔOFF are output to the fourth multiplication circuit 67 and the addition circuit 68.

  The fourth multiplication circuit 67 multiplies the luminance data Y sequentially input from the primary processing unit 37 by the gain ΣΔGAIN supplied from the second look-up table 63 and supplies the multiplication output to the addition circuit 68. Supply.

The adder circuit 68 adds the offset amount ΣΔOFF to the output data of the fourth multiplier circuit 67 and outputs the result. In this way, the fourth multiplier circuit 67 and the adder circuit 68 are
Y _d = ΣΔGAIN × Y _s + ΣΔOFF (17) is executed to correct the luminance level of the processing target range W according to the characteristics set by the operator.

Here, the total correction data ΣΔU, ΣΔV and ΣΔR will be described. As described with reference to FIG. 12, the color corrector according to the present invention is not limited to one source vector, but arbitrary 1 to n source vectors and arbitrary n associated with the n source vectors. The number of destination vectors can be set. Therefore, comprehensive correction data obtained from the correction data ΔU _{1 to} ΔU _n of the components in the U-axis direction corresponding to the first to nth source vectors is defined as ΣΔU, and corresponds to the first to nth source vectors. The total correction data obtained from the correction data ΔV _{1 to} ΔV _n of the component in the V-axis direction is defined as ΣΔV, and the correction data ΔR _{1 to} ΔR _n in the saturation direction corresponding to the first to n-th source vectors The total correction data obtained by the above is defined as ΣΔR.

Further, the secondary processing unit shown in FIG. 19 performs color correcting processing using polar coordinates instead of UV coordinates. Therefore, conversion data for converting the hue angles of the first to n-th source vectors into the hue angles of the first to n-th destination vectors are defined as Δθ _{1 to} Δθ _n , respectively. If the total correction data regarding the hue angle corresponding to the source vector of ΣΔθ,
ΣΔθ = Δθ ₁ + Δθ ₂ +... + Δθ _n
(18) Formula ΣΔR = ΔR ₁ + ΔR ₂ +... + ΔR _n
It can be expressed as

Next, in order to obtain the total correction data ΣΔθ related to the hue angle, as shown in FIG. 20A, the hue of the _first source vector SV ₁ set by the operator is set to θ _s1, and this first source vector Let the hue angle of the _first destination vector DV ₁ set to correspond to SV ₁ be θ _D1 . Further, the weighting function set for the first source vector SV ₁ is represented by K ₁ (θ). Therefore, correction data [Delta] [theta] ₁ regarding hue for changing the color of a pixel in the vicinity of the source vector SV ₁ in the first to the color of the pixels in the first vicinity of the destination vector DV ₁ may
It can be expressed using the formula _{Δθ 1 = (θ D1 -θ S1} ) × K 1 (θ) (19) formula.

Further, as described in the equation (6), the color corrector apparatus of the present invention is configured so that any n source vectors can be set. Therefore, as in the equation (6), if the first to nth source source vectors are set,
Δθ ₁ = (θ _D1 −θ _S1 ) × K ₁ (θ)
Δθ ₂ = (θ _D2 −θ _S2 ) × K ₂ (θ)
... (20) _{Δθ n = (θ Dn -θ Sn} ) × K n (θ)
The following equation holds.

Therefore, substituting Δθ ₁ to Δθ _{n in} equation (20) into equation (18),
ΣΔθ = Δθ ₁ + Δθ ₂ +... + Δθ _n
= (Θ _D1 −θ _S1 ) × K ₁ (θ)
+ (Θ _D2 −θ _S2 ) × K ₂ (θ)
+ ...
+ (Θ _Dn −θ _Sn ) × K _n (θ) (21)

Since the total correction data ΣΔθ is data in the local coordinate system in the UV space, this data must be converted into data in the orthogonal coordinate system in the UV space. Therefore, if the data in the U-axis direction represented by the orthogonal coordinate system in the UV space is ΔU and the data in the V-axis direction is ΔV,
ΔX = cos (θ + ΣΔθ)
= Cos (θ + (θ _D1 −θ _S1 ) × K ₁ (θ)
+ (Θ _D2 −θ _S2 ) × K ₂ (θ)
+ ...
+ (Θ _Dn −θ _Sn ) × K _n (θ)
ΔY = sin (θ + ΣΔθ)
= Sin (θ + (θ _D1− θ _S1 ) × K ₁ (θ)
+ (Θ _D2 −S _S2 ) × K ₂ (θ)
+ ...
+ (Θ _Dn −θ _Sn ) × K _n (θ) (22)

Next, in order to obtain the total correction data ΣΔR related to the saturation level, the saturation level of the first source vector SV ₁ set by the operator is set to “R _S1 ” as shown in FIG. The saturation of the nation vector DV ₁ is “R _D1 ”. Therefore, the saturation ratio between the first source vector SV ₁ and the destination vector DV ₁ can be expressed as R _D1 / R _S1 .

As in the calculation related to the hue angle, if the weighting function set for the _first source vector SV ₁ is K ₁ (θ), the color of the pixels near the _first source vector SV _{1 is set} to the first color. correction data [Delta] R ₁ concerning the saturation to change the color of pixels in the vicinity of the destination vector DV ₁ may
ΔR ₁ = (R _D1 / R _S1 ) × K ₁ (θ) (23)

Further, correction data ΔR ₁ -ΔR _n set so as to be associated with the first to n-th source source vectors are respectively
ΔR ₁ = (R _D1 / R _S1 ) × K ₁ (θ)
ΔR ₂ = (R _D2 / R _S2 ) × K ₂ (θ) (24) Formula ΔR _n = (R _Dn / R _Sn ) × K _n (θ)
It becomes.

Therefore, substituting each correction data ΔR _{1 to} ΔR _n of equation (24) into equation (18),
ΣΔR = (R _D1 / R _S1 ) × K ₁ (θ)
+ (R _D2 / R _S2 ) × K ₂ (θ)
+ ...
+ (R _Dn / R _Sn ) × K _n (θ) (25)

  The central processing unit 11 calculates the total correction data ΣΔX, ΣΔY, ΣΔR every 1 ° with respect to θ having a value of 0 ° to 360 ° based on the equations (22) and (25). Calculate. That is, 360 total correction data ΣΔX, ΣΔY, and ΣΔR corresponding to all angles are generated. These calculated total correction data ΣΔX, ΣΔY, and ΣΔR are stored in the lookup table 62 so as to be addressed by each angle θ.

  Next, the overall correction data ΣΔGAIN and ΣΔOFF stored in the lookup table 63 will be described.

The color corrector of the present invention is configured so that arbitrary correction gain values GAIN _{1 to} GAIN _n and offset values OFF _{1 to} OFF _n can be set for luminance signals of arbitrary first to n-th source vectors. Has been. Therefore, comprehensive correction data obtained based on the gain values GAIN _{1 to} GAIN _n related to the luminance signals of the first to nth source vectors is defined as ΣΔGAIN, and is set for the first to nth source vectors. The total correction data obtained based on the offset data OFF _{1 to} OFF _n regarding the luminance signal is defined as ΣΔOFF.

Here, in consideration of the already-described weighting function K (θ), the correction data ΔGAIN _{1 to} ΔGAIN _n relating to the gains of the luminance signals of the first to n-th source vectors are
ΔGAIN ₁ = GAIN1 × K ₁ (θ)
ΔGAIN ₂ = GAIN ₂ × K ₁ (θ) (26) Equation
...
ΔGAIN _n = GAIN _n × K ₁ (θ)
It becomes. Therefore, the total correction data ΣΔGAIN related to the gain of the luminance signal is
ΣΔGAIN = ΔGAIN ₁ + ΔGAIN ₂
+ ... + ΔGAIN _n
= GAIN ₁ × K ₁ (θ)
+ GAIN ₂ × K ₁ (θ)
+ ...
+ GAIN _n × K ₁ (θ) (27)

Considering the weighting function K (theta) in the same way, the correction data DerutaOFF1～derutaOFF _n concerning the offset of the luminance signal of the source vector of the first to n-th
ΔOFF ₁ = OFF ₁ × K ₁ (θ)
ΔOFF ₂ = OFF ₂ × K ₁ (θ) (28) Equation
...
ΔOFF _n = OFF _n × K ₁ (θ)
It becomes. Therefore, the total correction data ΣΔOFF related to the offset of the luminance signal is
ΣΔOFF = ΔOFF ₁ + ΔOFF ₂ +... + ΔOFF _n
= OFF ₁ × K ₁ (θ) + OFF ₂ × K ₁ (θ)
+... + OFF _n × K ₁ (θ) (29)

  The central processing unit 11 calculates total correction data ΣΔGAIN and ΣΔOFF for every 1 ° with respect to θ having a value of 0 ° to 360 ° based on these equations (27) and (29). . That is, 360 total correction data ΣΔGAIN and ΣΔOFF corresponding to all angles are generated. The calculated total correction data ΣΔGAIN and ΣΔOFF are stored in the lookup table 63 so as to be addressed by each angle θ.

  Here, in the editing apparatus 100 in which the secondary processing unit 60 having the configuration shown in FIG. 19 is used as the secondary processing unit 38 of the color corrector unit 35 in the image processing apparatus 30, the secondary processing by the secondary processing unit 60 is performed. When the operator selects the condition setting menu, the central processing unit 11 of the computer 10 displays a display screen similar to the display screen of FIG. 3B and displays still images before and after the processing in the windows W2, W3. Is displayed. Note that the processed still image in this case is processed by the color corrector 35 according to the default characteristics or the characteristics stored in the storage means according to the operator's selection.

Further, the central processing unit 11 displays a predetermined color sample, and when the operator clicks the mouse 17 on a still image before processing or the like, the central processing unit 11 displays the color on the basis of the hue and saturation of the clicked pixel. The hue data θ _S1 and the saturation degree R _D1 of the source vector are calculated. Further, the central processing unit 11 displays the source vector selected by the operator, and calculates the hue data θ _D1 and saturation degree R _D1 of the destination vector corresponding to the source vector in the same manner as in the case of the source vector.

Further, the central processing unit 11 receives the hue range θ _{w of} the weighting function K (θ) and the gain G of the processing of the weighting function K ₁ (θ) for the source vector. Further, the central processing unit 11 generates a weighting function K ₁ (θ) of the source vector based on the input range W to be processed and the gain G.

  The weighting function K (θ) is created by a shape obtained by cutting an isosceles triangle shape having a processing target range W and a gain G with a bottom surface and a height, respectively, with a height of 1, for example, a gain G of 1 In the following cases, the weighting function K (θ) is expressed by the above-described equations (10) to (12).

Further, the central processing unit 11 also receives a correction value of the luminance level in the source vector at this time. This correction value is represented by gain GAIN ₁ and offset amount OFF ₁ .

  The central processing unit 11 sets desired parameters for the first to nth source vectors and the destination vector in response to the operation of the operator. That is, when the input of all parameters for the first to nth source vectors and the corresponding destination vector is completed, the central processing unit 11 performs the following arithmetic processing.

The central processing unit 11, (20) and (24) After calculating the correction data _{Δθ 1 ~Δθ n, ΔR 1 ~ΔR} n sent to each source vector, based on the equation, corresponding to this calculated corrected data Weighting is performed by a weighting function K (θ). Further, the central processing unit 11 calculates total correction data ΣΔθ, ΣΔR based on the equation (18).

  The central processing unit 11 sends the total correction data Δθ and ΔR calculated in this way to the image processing unit controller 31 of the image processing apparatus 30 and stores them in the lookup table 62 of the color corrector 35. .

  The central processing unit 11 similarly weights the correction amount ΔY for the luminance level based on the equations (27) and (29) with the weighting function K (θ), so that the total correction data for each hue is obtained. ΣΔGAIN and ΣΔOFF are calculated. As a result, the central processing unit 11 corrects the luminance level of the range W to be processed as well, and effectively avoids the uncomfortable feeling caused by changing the hue. Further, at this time, also in the correction of the luminance level, the total correction data is stored in the look-up table 63 of the color corrector unit 35 in the same manner as in the case of hue and saturation.

  When calculating the correction amount in this way, the central processing unit 11 calculates each correction amount by 14 bits and 11 bits for the hue θ and the saturation r, respectively, and further calculates the total correction amount ΣΔ ( θ) is calculated. Here, the video signal is a digital video signal in a so-called 4: 2: 2 format, and each of the luminance data and the color difference data is formed by 10 bits.

That is, when the 10-bit color difference data in the 4: 2: 2 format is expressed on the color difference plane,
θ ₁ = arctan (511/510)
= 45.056117 °
θ ₁ = arctan (511/511)
= 45.000000 °
Therefore, the highest resolution θ _MAX is
θ _MAX = θ ₁ −θ ₂
= 0.0561117 °
It becomes.

  When it is difficult to ensure the resolution of this angle 0.0561117 °, when the hue is corrected, the hue that has been uniformly changed on the original screen changes stepwise. Accordingly, in order to ensure the resolution of the angle 0.0561117 °, it is necessary to express the hue θ by 14 bits.

  As for the saturation r, as shown in FIG. 21, in the pixels P1, P2, P3, and P4 that are continuous in the horizontal direction and the vertical direction, when the saturation r sequentially changes in the diagonal direction, the corrected image In this case, it is necessary to maintain the smooth change in the degree of saturation r in the diagonal direction. That is, the saturation needs to change between the pixels P1 and P4 adjacent in the diagonal direction in response to the change in the saturation between the pixels P1 and P2 and P1 and P3 adjacent in the horizontal and vertical directions.

Thus, if the change in saturation between the pixels P1 and P2, P1 and P3 adjacent in the horizontal direction and the vertical direction is set to a value 1,
1: 2 ^1/2 = 2 ¹⁰ : X
X ≒ 1448
Therefore, it is necessary to express the saturation r by 11 bits for the color difference data expressed by 10 bits.

  Therefore, the central processing unit 11 expresses the hue and saturation of the source vector, the hue and saturation of the destination vector by 14 bits and 11 bits, and sequentially changes the hue θ expressed by 14 bits, A hue and saturation correction amount ΣΔ (θ) by 14 bits and 11 bits is calculated. The bit length of the weighting function K (θ) and the like is also set so as to correspond to these.

  Here, the secondary processing unit 60 having the configuration shown in FIG. 19 used as the secondary processing unit 38 of the color corrector unit 35 has a saturation of 71 and a hue of 115 ° (for the source video image shown in FIG. (Brightness level 107 gradation) is designated as the source vector, the result of the secondary processing by setting the hue 87 ° as the destination vector is shown in FIG. 23, and the result of the secondary processing by setting the hue 308 ° as the destination vector. FIG. 24 shows the result of secondary processing with the hue 222 ° set as the destination vector. As is apparent from FIGS. 22 to 25, according to the secondary processing unit 60, a very slight change is seen from the source video image in the flesh-colored portion close to the hue 115 ° of the source vector, but this is practically sufficient. Processing results can be obtained.

  Further, the secondary processing unit 60 performs the secondary processing on the source video image as shown in FIG. 26 by designating red as the source vector and setting green as the destination vector, as shown in FIG. Is set as the source vector, green is set as the destination vector, green is specified as the source vector, red is set as the destination vector, and the result of the secondary processing is shown in FIG. FIG. 29 shows the result of secondary processing in which the source vector is designated as the source vector and green, red and yellow are designated as the destination vector. As is apparent from FIGS. 26 to 29, according to the secondary processing unit 60, even if the source vector is sequentially increased, the processing can be performed without affecting the image quality of the processing result.

  Further, the secondary processing unit 60 performs the secondary processing on the source video image as shown in FIG. 30 while emphasizing the saturation of the blue, yellow, and red components, as shown in FIG. FIG. 32 shows the result of secondary processing with the yellow component reduced. As is clear from FIGS. 30 and 31, according to the secondary processing unit 60, a sunset image is processed to increase the vividness of the sky to generate a vivid brilliant picture scene or a scene just before the sunset. can do.

  Further, as the secondary processing unit 38 of the color collector unit 35 in the image processing apparatus 30, for example, a color collector unit 70 configured as shown in FIG. 33 instead of the color collector unit 60 configured as shown in FIG. 19 described above. May be used.

  33 includes a first coordinate conversion circuit 71, first and second look-up tables 72 and 73, first to third multiplication circuits 74, 75, and 76, and an addition circuit 77. And a second coordinate conversion circuit 78.

  In the secondary processing unit 70, the first coordinate conversion circuit 71 is supplied with the color difference data U and V output from the primary processing unit 37. The coordinate conversion circuit 37 converts the color difference data U and V into data of hue θ and saturation r by executing the arithmetic processing of the above-described equation (16) for the color difference data U and V that are sequentially input. . Accordingly, the secondary processing unit 70 expresses sequentially input video signals in a polar coordinate format on the color plane. At this time, the first coordinate conversion circuit 71 generates 14-bit hue θ data and 11-bit saturation r data from the 10-bit color difference data U and V, respectively. This ensures a sufficient resolution in subsequent processing. The hue θ data generated by the first coordinate conversion circuit 71 is supplied to the look-up tables 72 and 73, and the saturation r data is supplied to the first and second multiplication circuits 74 and 76. Supplied.

  The first look-up table 72 is formed by accumulating correction data ΔX and ΔY calculated by the central processing unit 11 of the computer 10 in advance, and is calculated by the first coordinate conversion circuit 61. The corresponding correction data ΔX, ΔY is output to the first and second multiplication circuits 74, 75 with the hue θ as an address.

  The first multiplication circuit 74 multiplies the saturation r calculated by the first coordinate conversion circuit 71 by correction data ΔX composed of the horizontal axis component of the hue θ output from the first lookup table 72. Then, the multiplication output is supplied to the second coordinate conversion circuit 78. Further, the second multiplication circuit 75 supplies the correction data ΔY composed of the vertical axis component of the hue θ output from the first look-up table 72 to the saturation r output from the first coordinate conversion circuit 71. Multiplication is performed, and the multiplication output is supplied to the second coordinate conversion circuit 78.

  The second coordinate conversion circuit 69 converts data based on the horizontal and vertical axes of the hue θ output from the first and second multiplication circuits 74 and 75 into color difference data U and V. Output.

  The second look-up table 73 is formed in advance by accumulating the overall gain ΣΔGAIN and offset amount ΣΔOFF of the luminance level for each hue θ calculated by the central processing unit 11. The gain ΣΔGAIN and the offset amount ΣΔOFF are output to the third multiplier circuit 76 and the adder circuit 77 using the hue θ output from the first coordinate conversion circuit 71 as an address.

  The third multiplication circuit 76 multiplies the luminance data Y sequentially input from the primary processing unit 37 by the gain ΣΔGAIN supplied from the second look-up table 73 and supplies the multiplication output to the addition circuit 77. Supply.

  The adder circuit 77 adds the offset amount ΣΔOFF to the output data of the third multiplier circuit 76 and outputs the result. In this way, the arithmetic processing of the above-described equation (17) is executed, and the luminance level is corrected by the characteristic set by the operator for the range W to be processed.

  That is, the secondary processing unit 70 shown in FIG. 33 omits the correction process for the saturation r in the secondary processing unit 60 having the configuration shown in FIG. 19 and keeps the saturation r constant. Secondary processing is performed by changing only the hue θ.

  In the secondary processing unit 70 configured as described above, by omitting the correction processing for the saturation r, the setting work of the first lookup table 72 can be completed in a short time, and the configuration can be changed. It can be simplified.

  Here, the secondary processing unit 60 designates the saturation 71 and the hue 115 ° (luminance level 107 gradation) as the source vector for the source video image as shown in FIG. 34, and the hue 87 ° as the destination. FIG. 35 shows the result of the secondary processing with the vector set, FIG. 36 shows the result of the secondary processing with the hue 308 ° set as the destination vector, and the secondary result with the hue 222 ° set as the destination vector. The processed result is shown in FIG. In the secondary processing unit 70, when the hue 308 ° is set as the destination vector, the flesh-colored portion close to the source vector hue 308 ° becomes magenta, but the hue continuity is observed. The continuity of hue was better than that of the secondary processing unit 60 having the configuration shown in FIG.

  In this way, the continuity of the hue of the processed image is good because, in the secondary processing unit 60 having the configuration shown in FIG. 19, the source vector and the plane on the basis of the hue as shown in FIG. In contrast to correcting the hue and the saturation by connecting the destination vectors linearly, the secondary processing unit 70 shown in FIG. 33, on the plane based on the hue, as shown in FIG. This is considered to be due to correcting the hue and saturation by drawing an arc between the source vector and the destination vector.

  Next, an editing process operation by the editing apparatus 100 having such a configuration will be described.

  The central processing unit 11 of the computer 10 in the editing apparatus 100 secures a work area in the random access memory (RAM) 13 as described above, and is a read-only memory in response to the operation of the keyboard 16 and the mouse 17 by the editing operator. The operation of the editing apparatus 100 is controlled by executing a series of processing procedures stored in the (ROM) 12 or a hard disk device (not shown). When the editing operator instructs the start of the editing process. Then, by starting an editing processing module (software program), a predetermined editing processing GUI (Graphical User Interface) is displayed on the screen of the monitor device 14.

  The editing operation in the editing apparatus 100 is performed as follows on the editing processing GUI.

  First, the central processing unit 11 displays time information related to the material to be edited on the GUI timeline. That is, when the editing operator operates the mouse 17 or the like, one material is selected from a plurality of materials recorded on the hard disk device 20 (for example, one material is a material recorded on one tape). When a material is selected, the central processing unit 11 displays time information related to this material on the GUI timeline.

  Next, the central processing unit 11 determines whether an event has been set. That is, the editing operator designates an editing start point (in point) and an editing end point (out point) for the material displayed on the timeline by operating the mouse 17 or the like. As a result, one event (sometimes referred to as a scene) defined by the edit start point and the edit end point is set. Of course, not only one event but also a plurality of events may be set. The central processing unit 11 determines whether an event has been set by this operation.

  Further, the central processing unit 11 determines whether one frame for color correction processing has been selected. That is, the editing operator operates the mouse 17 or the like to select one scene from a plurality of scenes displayed on the timeline, and selects one frame in the scene. The central processing unit 11 determines whether one frame for color correction processing has been selected by this operation.

  Note that the order of setting the event and selecting one frame may be reversed or simultaneous.

  Next, the central processing unit 11 determines whether or not color correction processing is designated. That is, the editing operator designates color correction processing by clicking a color correction button on the GUI, for example. The central processing unit 11 determines whether or not color correction processing is designated for the event selected by this operation.

  When the color correction processing is designated, the central processing unit 11 activates the editing processing module and displays a predetermined color correction GUI on the screen of the monitor device 14.

  The disk unit controller 21 of the hard disk device 20 reproduces video data of a specified frame from the hard disk array 22 when a playback command instructing playback of the specified frame is supplied from the central processing unit 11. In addition, the image processing unit controller 31 of the image processing device 30 responds to the control command from the central processing unit 11 with respect to the video data reproduced by the hard disk device 10 by the primary processing unit 37 as described above. Perform primary processing. The video data that has been subjected to primary processing in the individual temperature is converted into an AVI (Audio Visual Interactitve) file format by the image processing unit controller 31 and transferred to the computer 100 via a local bus BUS.

  The central processing unit 11 uses the AVI (Audio Visual Interactitve) file format video data transferred from the image processing unit controller 31 via the local bus to convert the primary processed image into a primary on the color correction GUI. Display in the video display window.

  Here, the central processing unit 11 converts all pixel data of the video data subjected to the primary processing into luminance data Y and color difference data U and V. That is, since the video data in the AVI file format transferred from the image processing unit controller 31 via the local bus is expressed in RGB format, the central processing unit 11

The data is converted from RGB format to YUV format in accordance with the conversion formula shown below.

  The central processing unit 11 displays the video data converted into the YUV format in the vector scope on the color correction GUI. The vector scope represents the distribution on the UV plane by displaying all the supplied pixel data as one light spot (display point) using only the color difference data U and V of YUV format data. Scope for.

  Here, an actual example of a condition setting screen for secondary processing displayed on the screen of the monitor device 14 is shown in FIG. 40, and a schematic diagram thereof is shown in FIG. The secondary processing condition setting screen includes an image confirmation unit AR1 having a primary video display window and a secondary video display window, a vector scope unit AR2, a vector selection unit AR3, and a system setting unit AR4.

  The central processing unit 11 includes, in the primary video display window and the secondary video display window of the image confirmation unit AR1 on the condition setting screen for the secondary processing, a still image before secondary processing (consisting of a still image subjected to primary processing) Primary, The still image Secondary after the secondary processing is displayed side by side. That is, the central processing unit 11 processes the still image of one frame specified by the editing operator from the editing target specified by the editing start point and the editing end point as described above by the primary processing unit 37 and performs the secondary processing. Display as the previous still image. Further, when the editing operator variously changes the processing conditions via the condition setting screen, the central processing unit 11 sequentially updates the contents of the lookup table of the secondary processing unit 38 according to the conditions, The secondary processing result based on the updated content is displayed as a still image after the primary processing.

  As a result, the editing apparatus 100 can set various processing conditions while visually confirming the processing result, and can perform the processing of the color corrector with a high degree of freedom by a simple operation. Yes.

  Further, in the image confirmation unit AR1 of the condition setting screen for the secondary process, a display switching button FB is arranged above the still image before the secondary process and after the secondary process. When the button FB is clicked with the mouse, the central processing unit 11 displays the still image before or after the secondary processing on the dedicated monitor device by executing the event registered in the button FB. Switches the overall operation. As a result, the processing results can be examined in detail as necessary, and processing with higher accuracy can be executed accordingly.

  Further, when the editing operator clicks the mouse 17 on the still image before the secondary processing displayed in the primary video display window, the central processing unit 11 acquires the coordinate data of the clicked position, and this coordinate Image data at a position clicked from the data is acquired from the primary processing unit 37 of the image processing apparatus 20. Further, the central processing unit 11 displays the marker M on the adjacent vector scope part AR2 in accordance with the luminance Y and hue U and V of the image data as indicated by an arrow A in FIG. The vector scope part AR2 is a display part formed so that the relationship between the hue of each pixel and the processing range can be visually confirmed. This makes it possible to easily and reliably confirm the relationship between the hue and the processing range of the location to be changed as necessary, and the relationship between the hue and the processing range of the location to be excluded from the change processing. Color collector processing can be executed with a high degree of freedom by simple operations.

  Here, the vector selection unit AR3 and the system setting unit AR4 of the secondary processing condition setting screen are schematically shown in FIG. 42 together with a part of the vector parameter setting unit AR5. As shown in FIG. 42, in the vector selection unit AR3, ten buttons B0 to B9 for selecting a source vector are arranged side by side in the horizontal direction, and on both sides of these buttons B0 to B9, a switching button BL, BR is arranged. Further, following the switching button BR on the right side, a button B11 for selecting all the preselected source vectors is arranged, and subsequently, a display portion A1 for displaying the number of the selected source vector is formed.

  When the central processing unit 11 displays this condition setting screen, it sequentially displays the source vector numbers of the numbers 1 to 10 on the ten buttons B0 to B9. Further, when the switching buttons BL and BR are clicked by the mouse 17, the buttons B0 to B9 are displayed in the direction of the triangular display displayed on the buttons BL and BR by executing the events of the buttons BL and BR. Scroll sequentially.

  Further, when any of the buttons B0 to B9 is clicked with the mouse 17, the central processing unit 11 displays the number set for each button by the execution of the event registered in the buttons B0 to B9. To display. Further, the central processing unit 11 displays the source vector of this number on the vector scope unit AR2 and the vector parameter setting unit AR5, and further accepts the operation of the vector scope unit AR2 and the vector parameter setting unit AR5 for the source vector of this number, Thereby, the input of parameters is accepted for the source vector of this number. Incidentally, at the start of the operation, the central processing unit 11 displays the source vector of this number on the vector scope unit AR2 and the vector parameter setting unit AR5 from the default values, and further inputs the parameters by changing the default values. Accept.

  Further, the central processing unit 11 sets the lookup table of the secondary processing unit 38 by executing the above-described arithmetic processing only for the source vector of the selected number, and the image confirmation unit AR1 according to the set contents. Update the secondary video display window display. On the other hand, when the button B11 for selecting all source vectors is clicked with the mouse 17, the operation of the selection / non-selection button B12 arranged in the system setting unit AR4 among the first to 100th source vectors is performed. For all the source vectors selected by the above, the above-described arithmetic processing is executed according to the parameters set in these selected source vectors to set the lookup table of the secondary processing unit 38, and the image confirmation is performed according to the set contents. The display of the part AR1 is updated.

  As a result, the editing apparatus 100 sets the processing conditions while confirming the processing results for the individual source vectors, and selects all the source vectors by operating the selection / non-selection button B12 as necessary. By operating a button B11 for selecting the source vector, the overall processing result can be confirmed. Therefore, even when individual source vectors are freely set, and the parameters of a plurality of source vectors are variously set and the color corrector process is executed with a high degree of freedom, the overall processing result is visually checked, The parameters can be changed as appropriate, and the source vector can be selected again, so that a desired process can be executed with a simple operation.

  The vector parameter setting unit AR5 is provided with a button B12 that constitutes the above-described selection / non-selection toggle switch, and the system setting unit AR4 is provided with a button Ok that instructs completion of all settings. When the selection / non-selection button B12 is clicked with the mouse 17, the central processing unit 11 switches the selection / non-selection of the source vector of the number displayed on the display unit A1, and the source vector corresponding to this number Under the button (the first button B0 in FIG. 42), an Act character indicating the selected state is displayed, and this display is stopped. Further, when the button Ok for instructing the completion of all settings is clicked with the mouse, the central processing unit 11 executes the above-described arithmetic processing with the parameters set for all the selected source vectors to execute the secondary processing. The lookup table of the unit 38 is set, and the display of the condition setting screen is ended. Note that a button Cancel for canceling the operation of the button Ok is arranged in the system setting unit AR4.

  FIG. 43 is a diagram schematically showing the vector parameter setting unit AR5 on the condition setting screen for the secondary process. The central processing unit 11 accepts parameter settings for the source vector selected via the vector selection unit AR3 by operating the control bar arranged in the vector parameter setting unit AR5.

  That is, in the vector parameter setting unit AR5, a default button B13 is arranged adjacent to the selection / non-selection button B12. When the button B13 is operated, the central processing unit 11 displays the vector selection unit AR3. Reset the parameters of the source vector selected via the default values. Here, the central processing unit 11 uses the hue, saturation, and luminance of each source vector, the hue, saturation, luminance, and weighting function K (θ) of the corresponding destination vector as parameters of each source vector. W, gain G, brightness level multiplication value and offset value are accepted. Of these, for the hue, saturation, and luminance of the source vector, the values set corresponding to the numbers of the respective source vectors are set as default values. The set hue is set as the default value. As a result, in this editing processing apparatus 100, even an editing operator who is familiar with the conventional color corrector can operate without any discomfort.

  On the other hand, for the hue, saturation, and luminance of the destination vector, the same hue, saturation, and luminance as the corresponding source vector are set as default values, the range W of the weighting function K (θ), and the gain G, respectively. For, a predetermined value is set as a default value. Further, the value 1 is set as the default value as the multiplication value of the luminance level, and the value 0 is set as the offset value of the luminance level.

  The central processing unit 11 accepts parameter settings from such default values for each source vector, changes these values, switches the display of the image confirmation unit AR1, and operates the button B13. The parameter changed in this way is returned to the default value, and the display of the image confirmation unit AR1 is switched.

  Here, a scroll bar C1 and scroll buttons C2 and C3 are arranged at the right end of the vector parameter setting unit AR5. The central processing unit 11 is configured so that the scroll bar C1 or the scroll buttons C2 and C3 are moved by the mouse 17. Scrolls the control bar display when operated.

  As shown in FIG. 43, nine control bars are assigned to the vector parameter setting unit AR5, and the central processing unit 11 responds to the operation of the scroll bar C1 or the scroll buttons C2 and C3. Six of the nine control bars are displayed on the vector parameter setting unit AR5.

  The relationship between these control bars and color correction processing is shown in FIG.

  Of the nine control bars, the three control bars from the top are assigned the hue (Scr Hue), saturation (Scr Sat), and luminance (Scr Lum) of the source vector, respectively. When the buttons 17 arranged on these control bars are grasped by the mouse, the display of this button is moved left and right in response to the operation of the mouse 17. Further, the hue, saturation, and luminance of the source vector are updated according to the position of this button, and the hue, saturation, and luminance values arranged on each button are updated. Further, the display of the image confirmation unit AR1 is switched in conjunction with these processes.

  The following three control bars are assigned the destination vector hue (Dst Hue), saturation (Dst sat), and luminance (Dst Lum), respectively. The central processing unit 11 has buttons arranged on these control bars. When the mouse 17 is grabbed and operated, the button display is moved to the left and right in the same manner, and the hue, saturation, and luminance of the destination vector are updated, and the hue, saturation, Update the brightness value. Further, the display of the image confirmation unit AR1 is switched in conjunction with these processes.

  Further, as shown in FIG. 45, the subsequent control bar is assigned a range W (Win) of the weighting function K (θ), and the central processing unit 11 is a button arranged on the control bar. When the button is grasped and operated by the mouse 17, the button display is moved to the left and right in the same manner, and the range W of the weighting function K (θ) and the value of the range W arranged on the button are updated. Further, the display of the image confirmation unit AR1 is switched in conjunction with these processes.

  Further, the following two control bars are assigned a brightness level multiplication value (Mul Lum) and an offset value (Add Lum), and the central processing unit 11 is operated by the buttons arranged on the control bar being grasped by the mouse. Then, similarly, the button display is moved to the left and right, and the multiplication value and the offset value of the luminance level are updated. Further, the display of the image confirmation unit AR1 is switched in conjunction with these processes.

  On the other hand, a control bar for operating the gain G (Gain) of the weighting function K (θ) is arranged below the vector scope part AR2, and the central processing unit 11 has buttons arranged on these control bars. When the button is grasped and operated by the mouse, the display of the button is moved to the left and right in the same manner, and the gain G of the weighting function K (θ) is updated. Further, the display of the image confirmation unit AR1 is switched in conjunction with these processes.

  In the vector parameter setting unit AR5, a display unit A3 for the weighting function K (θ) is formed on the right side of the control bar for the gain G (Gain). When the control bar is operated for the range W and the gain G of the weighting function K (θ) and the range W and the gain G are changed, the central processing unit 11 similarly applies these ranges by the operation of the vector scope unit AR2 described later. When W and gain G are changed, the display of this display portion A3 is switched.

  In the display unit A3, the central processing unit 11 displays the vertical line VL1 at the center of the weighting function K (θ) in the same color as the cursor display of the source vector in the vector scope unit AR2, and similarly, the weighting function A vertical line VL2 is displayed where the weighting function K (θ) falls to 0 with the same color as the cursor display in the range W of K (θ). Further, a horizontal line corresponding to the value 1 and value 0 of the weighting function K (θ) is also displayed. As a result, in this embodiment, the setting of the range W and the gain G can be visually grasped, so that processing with a high degree of freedom can be executed with a simple operation.

  Note that the central processing unit 11 switches the entire operation even when numerical values are input via the keyboard 16 as in the case where these control bars are operated by the mouse 17, and thereby, as necessary. Parameters can be set by various operations.

  FIG. 46 is a schematic diagram showing the vector scope part AR2. The vector scope part AR2 displays a color distribution display part D1 indicating the color distribution of a still image to be subjected to secondary processing, and a hue ring R1 and a hue ring showing the hue of the color sample so as to surround the color distribution display part D1. R2 is displayed twice.

  The central processing unit 11 displays, on the color distribution display unit D1, a black and white image formed by projecting each pixel of a still image distributed in a three-dimensional color space onto the UV plane, as indicated by reference numeral F. The source vector, the destination vector, and the range W of the weighting function K (θ) are displayed on the color distribution display unit D1, and parameter settings are received via the color distribution display unit D1.

  That is, the rgb color system and the yuv color system used for displaying a still image in the image confirmation unit AR1 are:

It is represented by As shown in FIG. 47, colors that can be displayed in the rgb color system are limited to a rectangular area that is arranged to be inclined to the yuv color system.

  If each pixel of a still image distributed in a three-dimensional color space composed of this yuv color system is projected onto the UV plane, the color of the still image can be expressed by hue and saturation without brightness. Specifically, if the hue and saturation are expressed on the UV plane for each color of the color bar that is the color standard of the video equipment, it can be expressed as shown in FIG. 48, and black and white are displayed on the origin where the UV axes intersect. Will be expressed.

  Here, the color corrector process changes the hue in response to the operation of the editing operator, thus expressing the color distribution on the UV plane and displaying the source vector, the destination vector, etc. The editing operator can visually grasp the relationship between the color to be changed and the color that is not desired to be changed, thereby improving the usability. In addition, regarding pixels that are projected and overlapped at this time, the color distribution can be visually grasped by setting the brightness of the pixels on the uv plane according to the number of overlapping pixels.

  Therefore, when displaying the condition setting screen, the central processing unit 11 executes the processing procedure shown in FIG. 49 to form a basic display image of the color distribution display unit D1.

  That is, in the processing procedure shown in FIG. 49, in step SP1, the area of the image memory corresponding to this color distribution display unit D1 is set to black, and in step SP2, u and v values are acquired for one pixel of the still image. . The central processing unit 11 selectively inputs the image data U and V output from the primary processing unit 37 and acquires the u and v values of the still image.

  In the following step SP3, the brightness level (brightness) is increased by a predetermined value for the contents of the image memory corresponding to the acquired u and v values. Then, in the next step SP4, it is determined whether or not the processing has been completed for all the pixels. If a negative result is obtained here, the central processing unit 11 returns to step SP2.

As a result, the central processing unit 11 repeats the processing of step SP2 to step SP3, and sequentially updates the contents of the image memory corresponding to the color distribution display unit D1 for each pixel constituting the still image. Pixels are sequentially projected onto the UV plane, and the brightness of the projected pixels is set according to the number of overlapping pixels. Further, when the central processing unit 11 completes the projection for all the pixels and displays the contents of the image memory on the color distribution display unit D1, an affirmative result is obtained in step SP5, thereby ending this processing procedure.

  Then, the central processing unit 11 displays the hue rings R1 and R2 before and after displaying the basic image shown in FIG. 46, for example, on the color distribution display unit D1.

  Here, the hue ring R1 and the hue ring R2 are rings that display the hue in the color distribution display unit D1 with actual colors, and the ring R2 on the outer peripheral side shows a state before the hue correction. In contrast, the inner ring R2 shows a state after hue correction. When one of the source vectors is selected by the vector selection unit AR2, the central processing unit 11 changes the display color of the hue ring R1 on the inner circumference side according to the parameters set for the selected source vector. .

  As described above, the central processing unit 11 sensuously grasps what color is corrected to what color by comparing the hue ring R2 on the outer peripheral side and the hue ring R1 on the inner peripheral side, and sets the parameters. Has been made so that it can be set. In particular, the editing apparatus 100 can select a large number of source vectors as necessary, and thus, by comparing the outer hue ring R2 and the inner hue ring R1, what color is what color. By making it possible to grasp sensuously whether or not the correction is made, the processing result can be confirmed visually and correctly, and the usability can be improved.

  Further, when any source vector is selected in the vector selection unit AR2, the central processing unit 11 displays the selected source vector and the corresponding destination vector on the color distribution display unit D1. Here, the central processing unit 11 displays a circular marker MSV at a position corresponding to the hue, saturation, and luminance set by the vector parameter setting unit AR5 and the like, thereby expressing the source vector. Further, a straight cursor connecting the circular marker MSV and the origin is displayed.

  Furthermore, the central processing unit 11 determines the same circular marker MW1 and marker MW2 around the circular marker MSV according to the width W of the weighting function K (θ) set by the vector parameter setting unit AR5 or the like. The image is displayed close to the hue ring R1. Further, a straight cursor that connects each marker MW1 and marker MW2 to the origin is displayed. Thereby, the central processing unit 11 can easily and reliably grasp which color is centered and in which range the hue is corrected by comparing the hue ring R1 and the hue ring R2 with these markers MSV to MW2. Thus, the vector scope part AR2 is formed. On the other hand, a vector is provided so that it is possible to easily and reliably grasp in which range the hue is corrected by comparing the color distribution displayed on the color distribution display unit D1 with the markers MSV to MW2. The scope part AR2 is formed.

  At this time, the central processing unit 11 sets the straight cursors connecting the markers MSV to MW2 and the origin to the center of the weighting function K (θ) in the display unit A3 of the vector parameter setting unit AR5, and the cursors VL1, VL2 at both ends. Display with the same color. Thereby, the central processing unit 11 forms a display image so that the correspondence between the vector scope part AR2 and the display part A3 can be easily grasped.

  Further, the central processing unit 11 similarly displays a destination vector corresponding to the source vector on the color distribution display unit D1. Here, the central processing unit 11 displays a circular marker MDV at a position corresponding to the hue, saturation, and luminance of the destination vector set by the vector parameter setting unit AR5 and the like, thereby expressing the destination vector. To do. Further, according to the width W of the weighting function K (θ), similar circular markers M1 and M2 are displayed around the circular marker MDV. At this time, the central processing unit 11 arranges the marker M1 and the marker M2 so that the distance from the origin to the marker M1 and the marker M2 is equal to the distance from the origin to the marker MDV.

  As a result, the central processing unit 11 can easily and reliably grasp which color to be corrected by the color specified by the source vector SV or the like by comparing the hue rings R1 and R2 with these markers MDV to M2. The vector scope part AR2 is formed. On the contrary, the vector scope part AR2 is formed so that the pixel distribution in the processing result can be easily and reliably grasped by comparing the color distribution displayed on the color distribution display part D1 with the markers MDV to M2. To do.

  At this time, the central processing unit 11 displays the origin, the marker M1 and the marker M2 connected by a straight line, and the marker M1 and the marker M2 connected by an arc, for example, by correction with a cursor on the source vector side. The vector scope part AR2 is formed so that how the degree of saturation changes can be sensibly grasped.

  Further, when the central processing unit 11 displays the markers M1 to MDV in this manner, when the parameter is changed by operating the vector parameter setting unit AR5 or by keyboard input, the markers M1 to M1 correspond to the change. The MDV display is updated, and the hue ring R1 is updated.

  Further, when the editing operator clicks the mouse 17 on the still image before the secondary processing, the central processing unit 11 displays the marker M at a position corresponding to the pixel at the clicked position. As a result, the central processing unit 11 can easily and reliably relate the relationship between the hue and the processing range of the portion to be changed as necessary, and further the relationship between the hue of the portion to be excluded from the changing process and the processing range. The vector scope part AR2 is formed so that it can be confirmed, and the color corrector process can be executed with a high degree of freedom by a simple operation.

  Further, when the markers M1 to MDV related to the source vector and the destination vector are grasped by the mouse, the central processing unit 11 changes the display positions of the markers M1 to MDV according to the movement of the mouse 17, and further The parameter is changed according to the change of the display position, and the display of the hue ring R2 and the display of the image confirmation unit AR1 are changed.

  That is, as shown in FIG. 50, when the marker MSV of the source vector is grasped by the mouse 17, and the mouse 17 is operated along the cursor connecting the marker MSV and the origin, the source vector marker MSV is indicated as indicated by an arrow F1. Change the saturation. Similarly, when the mouse 17 is operated along the hue ring R1, as shown by the arrow F2, the hue by the marker MSV is changed while maintaining the relative relationship between the marker MSV and the markers MW1 and MW2, Correspondingly, the hue of the source vector is changed.

  On the other hand, as shown in FIG. 51, when the marker MW1 or the marker MW2 corresponding to the range W of the weighting function K (θ) is grasped by the mouse 17, as shown by arrows F3A and F3B, In accordance with the movement, the display positions of the markers MW1 and MW2 are changed along the hue ring R1, and the range W is changed in conjunction therewith. Further, according to the range W, as indicated by the arrows F3C and F3D, the position of the marker M1 or the marker M2 on the destination vector side corresponding to the marker MW1 and the marker MW2 is changed along the hue ring R1.

  Similarly, on the destination vector side, when the marker M1 or the marker M2 corresponding to the marker MW1 and the marker MW2 is operated by the mouse 17, the display positions of the marker M1 and the marker M2 are changed, and the weighting function K (θ ) Range W is changed. In conjunction with this, the marker MW1 and the marker MW2 on the source vector side are changed.

  On the other hand, as shown in FIG. 52, when the marker MDV of the destination vector is grasped by the mouse 17, and the mouse 17 is operated along the cursor connecting the marker MDV and the origin, as shown by the arrow F4. , Change the saturation of the destination vector. Similarly, when the mouse 17 is operated along the hue ring R1, as shown by the arrow F5, the hue by the marker MDV is changed while maintaining the relative relationship between the marker MDV and the markers M1 and M2. Correspondingly, the hue of the destination vector is changed.

  The central processing unit 11 determines the source vector and the destination vector when the source vector of the selected number is held at the default value, or when the source vector is reset to the default value by the operation of the default button B13. By setting the hue, saturation degree, and luminance to coincide with each other, the markers MSV to MW2 related to the source vector are displayed on the upper side of the display on the markers MDV to M2 related to the destination vector. When the mouse 17 is operated in the color distribution display unit D1 in a state where the display of the color distribution display unit D1 is formed in this way, the marker display related to the destination vector and the marker display related to the source vector are displayed. In response to the operation of the mouse 17, the upper and lower relations are sequentially switched cyclically. Further, when the above-described parameter change mouse 17 operation is executed at the marker display location, the central processing unit 11 changes the degree of saturation of the marker displayed on the upper side in response to the mouse 17 operation. To do.

  Accordingly, in the editing apparatus 100, various conditions for color correction processing are set by operating the mouse 17 on the color distribution display unit D1 while visually confirming the processing target and the still image of the processing result in the image checking unit AR1. It has been made possible.

  When the color correction process is performed, the editing operator selects this condition setting screen, and then, as shown in FIG. 53, in step SP11, the color to be corrected from the still image displayed on the image confirmation unit AR1 and the correction thereof. Determine the later color. Subsequently, the process proceeds to step SP12, and after selecting a source vector having a number not yet selected by the operation of the vector selection unit AR3, in step SP13, on the original image (consisting of a primary processed still image) in the image confirmation unit AR1. The position to be corrected is clicked with the mouse 17. Thereby, the position of the color to be corrected is confirmed by displaying the marker M in the color distribution display part D1 of the vector scope part AR2.

  Subsequently, the process proceeds to step SP14, where the source vector and the range W of the weighting function K (θ) are set so as to surround the marker M, and the gain is set by the operation of the vector parameter setting unit AR5. Subsequently, the process proceeds to step SP15, where a destination vector is set with the target color of the correction target as a target. Then, the process proceeds to step SP16, and it is determined whether or not an expected processing result is obtained via the image confirmation unit AR1. If a negative result is obtained here, the editing operator performs the operation of step SP17.

  Here, when the part to be corrected is not corrected, the editing operator clicks the part to be corrected again on the original image with the mouse 17, and conversely, the part to be corrected is corrected. Clicks again on the original image with the mouse 17 to check the relationship with the range to be corrected by displaying the marker M in the color distribution display section D1. Thus, the parameter is changed by changing the position of the marker relating to the source vector again. On the other hand, if the color is different from the desired color, the marker related to the destination vector, the gain G of the weighting function K (θ), the range W, and the like are changed.

  When the gain or the like is finely adjusted in this way, the editing operator moves to step SP16 and determines whether or not the expected processing result has been obtained again. As a result, the editing operator repeats the processing procedure of steps SP16 and SP17 by operating the marker in the color distribution display unit D1 and by operating the button in the vector parameter setting unit AR5, and can change the colors of various original images with a high degree of freedom. Even in the case of changing, when a desired process can be executed by a simple operation and an expected process result is obtained, the process proceeds from step SP16 to step SP18.

  Here, the editing operator determines whether or not the color correction has been completed for all desired portions, and if a negative result is obtained here, the editing operator returns to step SP12. As a result, the editing operator again sets the source vector and the like, changes the weighting function K (θ) and the like in various ways, and when the setting is completed for all the desired portions, the process moves from step SP18 to step SP19. End the procedure.

  Thus, in this editing apparatus 100, the editing operator can set various processing conditions with a high degree of freedom with a simple operation.

It is a block diagram which shows the whole structure of the editing apparatus to which this invention is applied. It is a block diagram which shows the specific structure of the primary process part of the image processing apparatus in the said editing apparatus. It is a basic diagram with which it uses for description of the setting of the said primary process part. It is a photograph showing an example of a source video image that is primary processed by the primary processing unit. 5 is a photograph showing a result of primary processing performed by the primary processing unit with the gamma value set to 2.51 for the source video image shown in FIG. 5 is a photograph showing a result of primary processing performed by the primary processing unit with a gamma value of 0.79 set for the source video image shown in FIG. FIG. 5 is a photograph showing a result of primary processing performed by the primary processing unit with the gamma value set to 0.32 for the source video image shown in FIG. 4. FIG. 5 is a photograph showing a result of primary processing performed on the source video image shown in FIG. 4 by setting the white level to 127 gradations and using the primary processing unit. FIG. 5 is a photograph showing a result of primary processing performed by the primary processing unit with the black level set to 127 gradations for the source video image shown in FIG. 4. FIG. FIG. 5 is a photograph showing a result of primary processing performed by the primary processing unit with the white level and black level set to 0 gradation and 255 gradation for the source video image shown in FIG. 4. FIG. 5 is a photograph showing a result of primary processing performed by the primary processing unit with the white level and black level set to 0 gradation only for red color data with respect to the source video image shown in FIG. 4. It is a block diagram which shows the specific structure of the secondary process part of the image processing apparatus in the said editing apparatus. It is a characteristic curve figure with which it uses for description of the weighting function in the secondary process by the said secondary process part. It is a basic diagram which shows the relationship between the weighting function and correction amount in the said secondary process. It is a photograph which shows an example of the source video image secondary-processed by the said secondary process part. For the source video image shown in FIG. 15, saturation 71 and hue 115 ° (luminance level 107 gradation) are designated as the source vector, hue 87 ° is set as the destination vector, and the secondary processing unit performs secondary processing. It is a photograph which shows the result of processing. 16 is a photograph showing a result of secondary processing by the secondary processing unit with the hue 308 ° set as a destination vector for the source video image shown in FIG. 15. 16 is a photograph showing a result of secondary processing by the secondary processing unit with the hue 222 ° set as a destination vector for the source video image shown in FIG. It is a block diagram which shows the other specific structural example of the secondary process part of the image processing apparatus in the said editing apparatus. It is a characteristic curve figure with which it uses for description of the weighting function in the secondary process by the secondary process part shown in FIG. It is a figure where it uses for description of the resolution in the said secondary process. FIG. 20 is a photograph showing an example of a source video image subjected to secondary processing by the secondary processing unit shown in FIG. 19. FIG. For the source video image shown in FIG. 19, saturation 71 and hue 115 ° (luminance level 107 gradation) are designated as the source vector, and hue 87 ° is set as the destination vector and the secondary shown in FIG. 19. It is a photograph which shows the result of having carried out the secondary process by the process part. FIG. 20 is a photograph showing a result of secondary processing performed on the source video image shown in FIG. 19 by setting the hue 308 ° as a destination vector and performing the secondary processing by the secondary processing unit shown in FIG. 19. FIG. 20 is a photograph showing a result of performing a secondary process on the source video image shown in FIG. 19 by setting a hue of 222 ° as a destination vector and using a secondary processing unit shown in FIG. 19. FIG. 20 is a photograph showing another example of a source video image subjected to secondary processing by the secondary processing unit shown in FIG. 19. FIG. FIG. 27 is a photograph showing the result of secondary processing performed by the secondary processing unit shown in FIG. 19 with red as the source vector and green as the destination vector for the source video image shown in FIG. 26. For the source video image shown in FIG. 26, red is designated as the source vector, green is designated as the destination vector, green is designated as the source vector, and red is designated as the destination vector. It is a photograph which shows the result of having carried out the secondary process by the secondary process part shown in FIG. Results of secondary processing by the secondary processing unit shown in FIG. 19 with red, green, and blue designated as source vectors and green, red, and yellow set as destination vectors for the source video image shown in FIG. It is a photograph which shows. FIG. 20 is a photograph showing another example of a source video image subjected to secondary processing by the secondary processing unit shown in FIG. 19. FIG. FIG. 30 is a photograph showing a result of performing secondary processing on the source video image shown in FIG. 30 while emphasizing the saturation of blue, yellow and red components by the secondary processing unit shown in FIG. 19. It is a photograph which shows the result of having reduced the yellow component on the said conditions by the secondary process part shown in FIG. 19 with respect to the source video image shown in FIG. 30, and performing the secondary process. It is a block diagram which shows the other specific structural example of the secondary process part of the image processing apparatus in the said editing apparatus. It is a photograph which shows an example of the source video image which carries out the secondary process by the secondary process part shown in FIG. For the source video image shown in FIG. 34, saturation 71 and hue 115 ° (luminance level 107 gradation) are designated as the source vector, and hue 87 ° is set as the destination vector and the secondary shown in FIG. It is a photograph which shows the result of having carried out the secondary process by the process part. FIG. 35 is a photograph showing a result of secondary processing performed on the source video image shown in FIG. 34 by setting the hue 308 ° as the destination vector and performing the secondary processing by the secondary processing unit shown in FIG. 33. FIG. 35 is a photograph showing a result of secondary processing performed by the secondary processing unit illustrated in FIG. 33 with the hue 222 ° set as a destination vector for the source video image illustrated in FIG. 34. It is a figure where it uses for description of correction | amendment of the hue by the secondary process part shown in FIG. It is a figure where it uses for description of correction | amendment of the hue by the secondary process part shown in FIG. 10 is a photograph showing an actual example of a condition setting screen for secondary processing displayed on the screen of the monitor device in the editing device. It is a figure which shows typically the condition setting screen of the said secondary process. It is a figure which shows typically the vector selection part and system setting part in the condition setting screen of the said secondary process with a part of vector parameter setting part. It is a figure which shows typically the vector parameter setting part of the condition setting screen of the said secondary process. It is a figure which shows typically the relationship between the control bar of the condition setting screen of the said secondary process, and a color correction process. It is a figure with which it uses for description of the setting of the weighting function in the condition setting screen of the said secondary process. It is a figure which shows the vector scope part of the condition setting screen of the said secondary process in detail. It is a figure where it uses for description of a color space. It is a figure which shows the relationship between the reference | standard color of a color bar, and uv plane. It is a flowchart which shows the preparation procedure of a color distribution image. It is a figure where it uses for description of operation of the source vector in the said vector scope part. It is a figure where it uses for description of operation of the range of the weighting function in the said vector scope part. It is a figure where it uses for description of operation of the target vector in the said vector scope part. It is a flowchart which shows the operation procedure in the said editing apparatus.

Explanation of symbols

10 Computer, 11 Central processing unit, 12 Random access memory, 13 Read only memory, 14 Monitor device, 15 Interface, 16 Keyboard, 17 Mouse, 20 Hard disk device, 21 Disk unit controller, 22 Hard disk array, 30 Image processing device, 31 Image processing unit controller, 32 cross point switch, 33 special effect processing unit, 34 mixer unit, 35 color collector unit, 36 demultiplexer, 37 primary processing unit, 38, 50, 60, 70 secondary processing unit, 39 multiplexer, 41U, 41V oversampling circuit, 42, 44 matrix circuit, 43R, 43G, 43B, 52, 62, 63, 72, 73 lookup table, 51, 61, 71, 78 Coordinate conversion circuit, 54Y, 54U, 54V, 68, 77 addition circuit, 64, 65, 66, 67, 64, 65, 66, 67, 74, 75, 76 multiplication circuit, 100 editing device

Claims (3)

A primary processing unit that performs processing for correcting the signal level of the video signal centered on the luminance level to the luminance data and color difference data of the input video signal;
A first lookup table for holding correction data corresponding to the color difference signal of the source vector of the video signal; and a second lookup table for holding correction data corresponding to the luminance level of the source vector of the video signal. A secondary processing unit that performs processing for correcting the signal level of the video signal centered on the hue on the luminance data and color difference data that have been processed by the primary processing unit;
A control unit that updates the contents of the first and second lookup tables of the secondary processing unit,
The secondary processing unit converts the color difference data sequentially input from the primary processing unit into hue and saturation data, and expresses a video signal in a polar coordinate format on a color plane, and the coordinate conversion circuit The first look-up table for outputting hue data and saturation correction data of the video signal as correction data corresponding to a color difference signal of a source vector of the video signal, using the generated hue data as an address, and A first multiplication circuit for multiplying saturation data generated by the coordinate conversion circuit by saturation correction data output from the first lookup table; and a hue output from the first lookup table. Correction data consisting of one axis component in the orthogonal coordinate system is multiplied by the correction data from the first multiplication circuit. A second multiplication circuit that multiplies the data of the sum and outputs the multiplication output as one hue data of the destination vector; and the other axis in the orthogonal coordinate system of the hue output from the first lookup table. A third multiplication circuit that multiplies the correction data composed of the component by the saturation data multiplied by the correction data from the first multiplication circuit and outputs the multiplication output as the other hue data of the destination vector; The second look-up table for outputting gain and offset amount data as correction data corresponding to the luminance level of the source vector of the video signal using the hue generated by the coordinate conversion circuit as an address, and the primary processing Gain output from the second look-up table to luminance data sequentially input from the unit A fourth multiplying circuit for multiplying the data, and adding the offset amount data output from the second look-up table to the luminance data multiplied by the gain data by the fourth multiplying circuit; An image processing apparatus comprising: an addition circuit that outputs as brightness data of a destination vector . The image processing apparatus according to claim 1 , wherein the coordinate conversion circuit of the secondary processing unit outputs the angle data with a larger number of bits than the color difference signal . The control unit inputs at least a hue and saturation level to be processed, and a hue and saturation level to be processed, a hue and saturation level to be processed, and a hue and saturation level to be processed. Data generating means for generating data to be stored in the first look-up table so as to correct the hue and saturation of the processing target in the video signal to the hue and saturation of the processing target with reference to the image processing apparatus according to claim 1, characterized in that it has.

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