WO2012056684A1 - 画像信号処理装置、画像信号処理方法およびプログラム - Google Patents
画像信号処理装置、画像信号処理方法およびプログラム Download PDFInfo
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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- H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
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- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
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- H04N25/135—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements based on four or more different wavelength filter elements
- H04N25/136—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements based on four or more different wavelength filter elements using complementary colours
Definitions
- the present invention relates to an apparatus that performs image signal processing, and more particularly, to an image signal processing apparatus that corrects distortion aberration of image data obtained from a single-chip color complementary color field color difference sequential imaging device.
- Surveillance cameras are being used in a variety of scenes, with higher image quality / lower costs. Surveillance cameras are used indoors such as banks, convenience stores, and pachinko machines, and outdoors such as station, road, river / dam monitoring. The field of application of surveillance cameras will continue to expand.
- a lens with a wide viewing angle causes the image to be distorted into a barrel shape.
- the distorted image is very different from the scenery actually seen by human eyes.
- a straight line does not appear in a straight line, or the size of an object differs between the screen center and the screen edge. For this reason, the distorted image has a great sense of incongruity and affects the degree of fatigue of the camera image observer. It is desirable to correct the distortion.
- FIG. 12 is a block diagram of the image signal processing apparatus disclosed in the publication.
- the image signal processing apparatus includes a coordinate conversion unit 102 that calculates a corresponding sampling coordinate on a color mosaic image corresponding to a pixel position of a color image when a deformation process is performed from a pixel position of the color image, and a color mosaic.
- a sampling unit 104 that interpolates and generates pixel values at sampling coordinates for each of a plurality of color planes obtained by decomposing an image, and a color generation unit 106 that generates a color image by synthesizing the interpolation values of the color planes.
- This image signal processing device obtains each pixel value of a color image subjected to deformation processing from a color mosaic image by interpolation calculation as a pixel value of sampling coordinates. Thereby, the color interpolation process for generating a color image from the color mosaic image and the deformation process for the color image can be realized by a single interpolation calculation.
- a color filter array having a complementary color array may be used.
- the complementary color field color difference sequential data is a processing target
- the resolution is greatly degraded.
- the horizontal resolution tends to deteriorate due to the horizontal interpolation before the luminance data generation.
- interlace data is processed for each color filter plane. That is, since linear interpolation is performed for each interlaced scan data, the frequency component in the vertical direction is likely to be folded back and the image is deteriorated.
- An object of the present invention is to provide an image processing apparatus capable of appropriately correcting a distortion of a complementary color field color difference sequential signal image.
- One aspect of the present invention is an image signal processing apparatus, which should display based on a frame memory that stores field color difference sequential complementary color format image data and distortion information given in advance.
- An address generation unit that generates an address indicating each position on the frame memory corresponding to the position of each pixel in the screen, and color data of a point specified by the address are included in a predetermined number of lines above and below the same line
- a color data generating unit that interpolates and generates color data of pixels of the same color series as the color series to be generated by interpolation, and first luminance data at a point specified by an address above and below Color data generated by interpolating luminance data of pixels in the same row included in a certain number of lines and the same color sequence as the color sequence to be generated by interpolation
- An adaptive luminance data generation unit, and a luminance base data generation unit that generates second luminance data at a point specified by an address by interpolating luminance data of pixels in the same row included in a predetermined number of lines above and below the luminance
- the image signal processing method includes a step of storing image data in a field color difference sequential complementary format in a frame memory, and a display based on distortion information given in advance.
- Another aspect of the present invention is a program, which is a program for correcting distortion of image data in a field chrominance sequential complementary color format, and storing image data in a frame memory in a computer; A step of generating an address indicating each position on the frame memory corresponding to the position of each pixel in the screen to be displayed based on distortion information given in advance, and color data of a point specified by the address, A step of interpolating and generating color data of pixels in the same row included in a predetermined number of lines above and below the color sequence to be generated by interpolation, and a point specified by an address
- the color to be generated by interpolation which is the same row of pixels included in a predetermined number of lines above and below the luminance data of 1 Interpolating luminance data of pixels of the same color series as the column, second luminance data of the point specified by the address, luminance data of pixels of the same column included in a predetermined number of lines above and below it
- FIG. 1 is a block diagram showing an image signal processing apparatus according to an embodiment of the present invention.
- FIG. 2 is a diagram showing camera signal processing having the image signal processing apparatus according to the embodiment of the present invention.
- 3A is a diagram showing an example of a complementary color field color difference sequential data sequence
- FIG. 3B is a diagram showing an example of an A field of interlace scanning
- FIG. 3C is a diagram of an B field of interlace scanning. Illustration showing an example
- FIG. 4 is a diagram showing a complementary color field color difference sequential data string and correction coordinate points.
- FIG. 5 is a diagram showing a vertical optical center position depending on a field difference.
- FIG. 6 is a diagram showing complementary color field color difference sequential data strings and correction coordinate points (details).
- FIG. 7A is a diagram showing an image before correction
- FIG. 7B is a diagram showing an ideal distortion correction image
- FIG. 7C is an image quality deterioration due to interpolation for each color plane of interlace data.
- Figure showing FIG. 8 is a diagram showing an outline of interpolation processing.
- FIG. 9A is a diagram showing an example in which color data is not deteriorated when luminance data is generated
- FIG. 9B is a diagram showing an example in which color data is deteriorated when luminance data is generated.
- 10A shows a luminance data generation filter and an image after luminance color signal processing
- FIG. 10B shows a luminance data generation filter and an image after luminance color signal processing
- FIG. 10A shows a luminance data generation filter and an image after luminance color signal processing
- FIG. 10B shows a luminance data generation filter and an image after luminance color signal processing
- FIG. 11A shows a luminance data vertical interpolation filter and an image after luminance color signal processing
- FIG. 11B shows a luminance data vertical interpolation filter and an image after luminance color signal processing
- FIG. ) Is a diagram showing the luminance data vertical interpolation filter and the luminance color signal processed image
- FIG. 11D is a diagram showing the luminance data vertical interpolation filter and the luminance color signal processed image.
- FIG. 12 shows an example of a conventional image signal processing apparatus.
- An image signal processing apparatus includes a frame memory for storing field color difference sequential complementary color format image data, and a frame memory corresponding to the position of each pixel in the screen to be displayed based on distortion information given in advance.
- An address generation unit that generates an address indicating each position in the color sequence, and a color series that is to be generated by interpolation in the same row of pixels included in a predetermined number of lines above and below the color data of the point specified by the address
- the color data generation unit that interpolates the color data of the pixels of the same color series and the first luminance data at the point specified by the address are the pixels in the same column included in a predetermined number of lines above and below it.
- Color data corresponding luminance data generation unit that interpolates luminance data of pixels of the same color series as the color series to be generated by interpolation, and by address
- a luminance base data generating unit that generates second luminance data of a specified point by interpolating luminance data of pixels in the same column included in a predetermined number of lines above and below the complementary luminance data of the point specified by the address
- a complementary color data generation unit that generates data based on the color data, the first luminance data, and the second luminance data.
- An image signal processing apparatus includes a luminance color signal generation unit that generates a luminance color signal based on the complementary color data generated by the complementary color data generation unit, and a luminance color signal generated by the luminance color signal generation unit And a correction processing unit that corrects distortion in the horizontal direction.
- the distortion correction processing in the horizontal direction can be configured without using a frame memory.
- the image signal processing method includes a step of storing field color difference sequential complementary color format image data in a frame memory, and a frame corresponding to the position of each pixel in the screen to be displayed based on distortion information given in advance.
- the color data having a far spatial phase and the second brightness data having a spatial phase close to the first brightness data corresponding to the color data are generated.
- FIG. 1 is a diagram showing an image signal processing apparatus 1 according to an embodiment of the present invention.
- the image signal processing apparatus 1 includes a frame memory 12 that stores an image signal, a pre-processing unit 10 that performs preprocessing of the image signal stored in the frame memory 12, and a cyclic type for the image signal stored in the frame memory 12.
- a cyclic noise suppression unit 14 that performs noise suppression, and a first distortion correction processing unit that corrects distortion in the vertical direction of the image signal stored in the frame memory 12 (hereinafter referred to as a “first correction processing unit”).
- a luminance color signal generation unit 18 that generates a luminance color signal from the corrected image signal
- a second distortion aberration correction processing unit (hereinafter referred to as “second”) that corrects distortion in the horizontal direction of the luminance color signal.
- 20 a second distortion aberration correction processing unit that corrects distortion in the horizontal direction of the luminance color signal.
- 20 a post-processing unit 22 that performs post-processing on the corrected luminance color signal.
- the first correction processing unit 16 includes an address generation unit 24 that generates an address indicating each position on the frame memory corresponding to the position of each pixel in the screen to be displayed based on distortion information given in advance. ing. Since the vertical distortion is corrected by performing screen display based on the complementary color data of the point specified by this address, the point specified by this address is hereinafter referred to as a “correction coordinate point”.
- the image signal processing apparatus 1 has distortion amount information.
- the actual image height relative to the ideal image height can be given by a curve or a polygonal line.
- a distortion aberration with a viewing angle of 90 degrees or less can be approximated relatively well with a polynomial of the order of several orders.
- the image signal processing apparatus 1 has distortion amount information in the form of a polynomial, for example.
- FIG. 4 is a diagram showing correction coordinate points.
- the right side of FIG. 4 is an overall view of the image.
- a distorted horizontal line indicates that a straight line in the real space is distorted.
- correction is made so that the distorted horizontal line becomes a straight line.
- the address generation unit 24 identifies the distorted horizontal line based on the amount of distortion.
- a distorted horizontal line can be represented.
- a coefficient for adjusting the distortion aberration correction amount may be provided for a coefficient of a polynomial representing the number of pixels from the optical center of the image and the distortion amount.
- the first correction processing unit 16 can correct distortion by reading the complementary color data on the horizontal line and displaying the read data on the same line.
- FIG. 4 The left side of FIG. 4 is an enlarged view of the upper left area in the entire right image.
- correction coordinate points P1 to P6 are generated at positions where the distorted line and the pixel column intersect.
- the first correction processing unit 16 reads the complementary color data of the correction coordinate point.
- the correction coordinate points P1 to P6 do not necessarily coincide with the pixel positions on the frame memory 12
- the correction coordinate points that do not coincide with the pixel positions on the frame memory 12 It is necessary to generate complementary color data of the correction coordinate point by interpolating the above data.
- the first correction processing unit 16 has a color data selection unit 26, a color data generation unit 28, a luminance data generation unit 30, and a color data corresponding luminance data selection unit 32 as a configuration for performing a process of interpolating pixel values.
- the complementary color data generation unit 38 includes the color data generated by the color data generation unit 28, the color data corresponding luminance data generated by the color data corresponding luminance data generation unit 34, and the luminance base data. Based on the luminance base data generated by the generation unit 36, complementary color data in which the distortion in the vertical direction is corrected is generated.
- each configuration of the first correction processing unit 16 will be described.
- the color data selection unit 26 selects a line having desired color data from the upper and lower lines, and inputs information for specifying the selected line to the color data generation unit 28.
- the color data generation unit 28 performs color data interpolation processing based on the positional relationship between the correction coordinate points generated by the address generation unit 24 and the pixels above and below the correction coordinate points.
- the color data generation unit 28 inputs the interpolated color data to the complementary color data generation unit 38.
- the luminance data generation unit 30 generates luminance data from the image data read from the frame memory 12 and inputs the generated luminance data to the color-corresponding luminance data selection unit 32 and the luminance base data generation unit 36.
- the color data corresponding luminance data selection unit 32 selects pixel luminance data corresponding to desired color data from the input luminance data, and inputs the selected luminance data to the color data corresponding luminance data generation unit 34.
- the color data corresponding luminance data generation unit 34 performs interpolation processing of luminance data corresponding to the color data based on the positional relationship between the correction coordinate points generated by the address generation unit 24 and the pixels above and below the correction coordinate point.
- the color data corresponding luminance data generation unit 34 inputs the luminance data subjected to the interpolation processing to the complementary color data generation unit 38.
- the luminance data generated here corresponds to “first luminance data” in the claims.
- the luminance base data generation unit 36 performs luminance data interpolation processing based on the positional relationship between the correction coordinate points generated by the address generation unit 24 and the pixels above and below the correction coordinate points.
- the luminance base data generation unit 36 inputs the interpolated luminance data to the complementary color data generation unit 38.
- the luminance data generated here corresponds to “second luminance data” in the claims.
- the complementary color data generation unit 38 receives the color data input from the color data generation unit 28, the luminance data (first luminance data) input from the color data corresponding luminance data generation unit 34, and the luminance base data generation unit 36. Complementary color data in which distortion in the vertical direction is corrected is generated based on the input luminance data (second luminance data).
- FIG. 2 is a diagram illustrating an operation of camera signal processing of the image signal processing apparatus 1 according to the embodiment of the present invention.
- the operation of the image signal processing apparatus 1 will be described with reference to FIG.
- the image signal processing apparatus 1 performs pre-processing of a complementary color field color difference sequential format color image signal (S10). It is assumed that the image signal is digitized.
- the image data may be obtained from an image sensor, or data stored in a storage device may be input.
- pre-processing (S10) gain addition, optical black adjustment, and the like are performed.
- the image signal processing apparatus 1 stores the image signal after the previous stage processing in the frame memory 12.
- the image signal processing apparatus 1 performs frame cyclic noise suppression processing (S12), electronic zoom, upside down, image update stop (freeze), etc. as camera signal processing using the frame memory 12.
- the frame cyclic noise suppression processing (S12) is processing for forming an infinite impulse response filter in the time direction using the frame memory 12.
- This frame cyclic noise suppression processing (S12) has high noise suppression. For this reason, the case where the frame memory 12 is mounted in the image signal processing apparatus 1 is increasing.
- the image signal processing apparatus 1 performs a first distortion correction process (hereinafter referred to as “first correction process”) on the image signal stored in the frame memory 12 (S14).
- the first correction process is a process for correcting distortion in the vertical direction.
- the first correction process will be described in detail with reference to FIG.
- the complementary color image data stored in the frame memory 12 is field color difference sequential, the RG system and the BG system appear alternately in line units.
- the RG system and the BG system are alternately read in line units by raster scan and input to the luminance color signal generation unit 18.
- the luminance color signal generation unit 18 generates a luminance color signal from the complementary color data by switching the color generation processing between the RG system and the BG system.
- data of an arbitrary line is read along the distortion, and data that can be processed by the luminance color signal generation unit 18 is generated.
- the correspondence relationship between the complementary color data series and the RGB series will be described with reference to FIG.
- FIG. 3A is a diagram showing an example of a data string in a complementary color field color difference sequential format
- FIG. 3B is a diagram showing an A field for interlace scanning
- FIG. 3B is a diagram showing a B field for interlace scanning.
- the color data is described as follows.
- CM Cyan + Magenta
- YG or “YeGr” represents Yellow + Green
- CG or “CyGr” represents Cyan + Green.
- YM” or “YeMg” represents Yellow + Magenta.
- CM Cyan and Magenta
- YG is obtained by adding Yellow and Green.
- Cyan consists of Blue (B) and Green (G).
- Magenta consists of Red (R) and Blue (B).
- Yellow (Y) consists of Green (G) and Red (R).
- CG Cyan and Green
- YM Yellow and Magenta
- CM in the 0th row and 0b column and the YG in the 1st row and 0b column in FIG. 3C.
- CG in the 0th row and 1b column in FIG. The same applies to the column YM. That is, the CMYG line is a BG system, and the YMCG line is an RG system.
- FIG. 4 is a diagram showing correction coordinate points. Based on the distortion aberration information and the distance from the optical center, the address generation unit 24 sets correction coordinate points P1 to P1 as the positions on the frame memory 12 corresponding to the positions of the pixels on a certain line in the screen to be displayed. Get P6.
- FIG. 4 illustrates one field. Actually, as shown in FIGS. 3B and 3C, the A field (see FIG. 3B) and the B field (see FIG. 3C) are 0.5 lines in the vertical direction. It's off. The address generation unit 24 can shift the optical center position in the vertical direction by 0.5 lines by a field signal (not shown) in response to this line shift.
- FIG. 5 is a diagram showing the vertical optical center position depending on the field. The vertical center is 4 lines for the A field and 3.5 lines for the B field. Thereby, the vertical center can be aligned between the A field and the B field.
- data of the required number of lines may be read from the frame memory 12, or the fact that the vertical coordinates change continuously is used. Then, data read from the frame memory 12 per unit time may be reduced by providing a buffer for each line.
- the four lines of vertical coordinates required for the coordinate 2 interpolation process are Y (2n-1), Y (2n), Y (2n + 1), Y (2n + 2) It is.
- the four lines of vertical coordinates required for the coordinate 3 interpolation process are Y (2n-1), Y (2n), Y (2n + 1), Y (2n + 2) It is.
- the difference between the data required for the processing of coordinate 1 and the data required for the processing of coordinate 2 is the data of the line indicated by the vertical coordinates Y (2n ⁇ 1) and Y (2n + 3).
- the data of the line indicated by Y (2n + 3) is not used in the process of coordinate 2 and is discarded, and the data of the line indicated by Y (2n ⁇ 1) is newly read from the frame memory 12.
- only the data of the line indicated by the vertical coordinate Y (2n ⁇ 1) may be newly read from the frame memory 12.
- FIG. 6 is a diagram for explaining the correction coordinate point P3 shown in FIG. 4 in more detail.
- data is selected from the YMCG line which is the RG system. It is necessary to calculate CG as RG data at the corrected coordinate point P3, and interpolation is performed from 2 rows and 1 column data and 2 rows and 3 columns data (both are CG).
- color data consisting of the same color filter appears only every two lines, and in the case of interlaced readout as in the present embodiment, if linear interpolation is performed for each color plane, aliasing in the frequency band is performed. Occurrence and deterioration of vertical resolution due to interpolation calculation are inevitable. In particular, when the band is not optically limited in the vertical direction as in a surveillance camera, the degree of deterioration increases.
- FIG. 7A shows an image before correction
- FIG. 7B shows an ideal distortion corrected image
- FIG. 7C shows a distortion corrected image by linear interpolation for each interlace same color plane.
- complementary color data is calculated based on the following three components in order to prevent the image quality from being deteriorated as much as possible (smoothing or adding a false signal).
- Color data Tgt_H 2.
- Luminance data corresponding to color data (first luminance data) yl_compre 3.
- Color data Tgt_H As described above, in the present embodiment, correction is performed using a total of four lines including two lines above and below the correction coordinate point.
- the color data selection unit 26 selects two lines of data of the same color difference system as the calculation target (here, the RG system) from the four lines read from the frame memory 12.
- the color data selection unit 26 selects the data of the first line and the third line as shown by (A) in FIG.
- the calculation target is a BG system
- the data of the second line and the fourth line are selected as shown in FIG. 6B.
- the color data generation unit 28 weights the selected two lines of data based on the position of the correction coordinate point, and performs interpolation processing.
- the correction coordinate point is not on the line, and the coordinate value includes an integer part and a decimal part.
- the vertical coordinate in FIG. 6 is 2.5
- the distance from the first line is 1.5
- the distance from the third line is 0.5.
- the complement of the total distance may be used as the weighting factor.
- the color data interpolation calculation method is linear interpolation. It should be noted that the interpolation of color data needs to use data with a far spatial phase. That is, in order to obtain the RG system data of the coordinate P, it is necessary to use the data of the first line far from the adjacent second line.
- Brightness data corresponding to color data yl_compre will be described. It should be noted that the interpolation of the color-corresponding luminance data needs to use data having a spatial phase that is far from the color data similarly to the color data. As described above, in the present embodiment, a total of four lines including the upper and lower two lines of the correction coordinate point are used.
- the luminance data generation unit 30 generates luminance data for each line from the four lines of data.
- the color data-corresponding luminance data selection unit 32 selects, from the generated four lines of luminance data, two lines of data that are the same color difference system lines as the calculation target (here, the RG system).
- the color data corresponding luminance data generation unit 34 performs interpolation processing by weighting the selected two lines of data based on the position of the correction coordinate point.
- the correction coordinate point is composed of an integer part and a decimal part, but weighting similar to that of the color data generation part 28 may be used.
- FIG. 8 shows four lines of luminance generation by the luminance data generation unit 30, selection of two lines by the color data corresponding luminance data selection unit 32, and interpolation of luminance data from the two lines by the color data corresponding luminance data generation unit 34. It is a figure which shows the outline
- the luminance data generation unit 30 can obtain luminance data by applying a low-pass filter (Low Pass Filter: LPF).
- LPF Low Pass Filter
- an odd tap finite impulse response (FIR) LPF is used because it is digital signal processing, intra-frame processing, and a linear phase filter can be configured.
- the luminance data generation FIRLPF needs to consider the following items. (1) Frame memory bandwidth and number of taps (2) Attenuation amount (3) Pass bandwidth
- Digital filters generally have a higher degree of design freedom such as pass bandwidth, cutoff frequency, and attenuation as the number of taps increases. In this case, as the number of taps increases, the amount of data that must be read from the frame memory 12 per unit time increases. To widen the frame memory bandwidth, it is necessary to increase the reading speed or widen the data bus. Since both speed and bus width can be cost-increasing factors, it is necessary to balance the conditions shown in (2) and (3).
- the luminance data corresponding to color data needs to sufficiently attenuate the color data (color carrier component) existing as a high frequency component. If the color carrier component remains, the color data calculated in the subsequent luminance color signal generation (S16) may deteriorate.
- FIG. 9A shows an example of an image with the correct color component when the color carrier attenuation is 65 dB
- FIG. 9B shows an example of a deteriorated image when the attenuation is 14 dB.
- luminance data generation has insufficient color carrier component attenuation
- color data after luminance color signal processing has a symptom of spreading in the Mg-Gr direction on the vector scope as shown in the right diagram of FIG. 9B.
- the color carrier component attenuation amount must be set so that such a phenomenon does not occur after the luminance color signal processing.
- FIG. 10A shows an example of an image using 2TAP (1,1) for luminance data generation
- FIG. 10B shows an example of an image using 3TAP (1,2,1) for luminance data generation
- FIG. 2TAP (1,1) and 3TAP (1,2,1) have no problem in the color carrier attenuation amount, but 2TAP (1,1) has a spatial phase shift from the color data, and image quality degradation occurs ( The diagonal line is locally thicker). Although the spatial phase of 3TAP (1, 2, 1) matches the color data, the diagonal line becomes thick overall as the pass frequency bandwidth is relatively narrow. In order to avoid image quality degradation as much as possible, it is better to construct an LPF with a wide passband.
- the luminance data generation unit 30 configures 11TAPFIRLPF from the trade-off between the frame memory band and the filter performance.
- FIG. 10C is a diagram illustrating an example of an image using 11TAPFIRLPF for luminance data generation.
- the luminance data corresponding to color data is generated by interpolation using luminance data of a line in which complementary color filter data of the same color series as the target color series to be calculated exists, looking at the top and bottom of the same column. Used to replace luminance base data (close to spatial phase) described later.
- Luminance base data YLc Since the luminance base data can be generated using data of adjacent pixels, the spatial phase is close.
- the luminance base data generation unit 36 generates luminance base data using a total of four lines, ie, two upper and lower lines of the processing target vertical coordinate. In this embodiment, BiCubic interpolation is used.
- FIG. 11 is a diagram showing a difference in image data after luminance color signal processing by the vertical interpolation method.
- BiLinear the thickness of the diagonal line changes.
- B-Spline there is almost no change in the thickness of the diagonal line, but the overall rounding of the signal is large as the calculation performed on the data before luminance color processing.
- BiCubic is not without the change in the thickness of the diagonal lines and the rounding of the waveform, but generally good processing results can be obtained.
- the complementary color data generation unit 38 replaces the luminance data corresponding to the spatially distant color data with the spatially close luminance base data, thereby calculating the desired complementary color filter data out.
- the image signal processing apparatus 1 processes the obtained complementary color field color difference sequential data in the luminance color signal generation unit 18 to obtain luminance data and color data (S16).
- the image signal processing apparatus performs a second distortion correction process (hereinafter referred to as “second correction process”) on the generated luminance color signal (S18).
- the second correction process is a distortion correction process in the horizontal direction. Since the memory required for distortion correction in the horizontal method is in units of lines, the degree of freedom of the place where the second correction process is performed is high. Note that the distortion amount may be defined in the same manner as the vertical processing (S14).
- the image signal processing apparatus 1 performs post-processing on the luminance color signal after the second correction processing (S20). The configuration and operation of the image signal processing device 1 according to the present embodiment have been described above.
- the image signal processing apparatus 1 corrects distortion aberration of a complementary color field color difference sequential signal image, and in the vertical direction, with respect to the complementary color field color difference sequential signal, Complementary color data is calculated using color data with a spatial phase far away, luminance data corresponding to the color data, and luminance base data with a spatial phase close to each other.
- a luminance data having a close spatial phase and a color data having the same color filter having a far spatial phase are used to obtain a complementary color field color difference sequential color image signal with good image quality.
- interpolation calculation for correcting distortion can be performed after luminance generation.
- the function of the image signal processing apparatus 1 can be recorded as a program on a recording medium such as a magnetic disk, a magneto-optical disk, or a ROM. Therefore, the function of the image signal processing apparatus 1 can be realized by reading this recording medium with a computer and executing it with an MPU, DSP, or the like.
- the first correction process (vertical distortion correction process) has been described by taking complementary color field color difference sequential format input and complementary color field color difference sequential output as an example. This is to clarify the excellent functions and effects realized by the present case by clarifying the process breaks and explaining the configuration to enhance the separation of the functional blocks.
- a configuration in which the last of the first correction processing is the front stage of the luminance color signal generation unit 18 may be employed. Further, if integrated, luminance data may be used as it is in luminance color signal processing, and the color data may be separately input to the color difference generation unit.
- the image signal processing apparatus corrects the distortion aberration of the complementary color field color difference sequential signal image
- the vertical direction color data, color data having a spatial phase far from the complementary color field color difference sequential signal is obtained.
- a complementary color field color difference sequential color image signal with good image quality can be obtained by using luminance data corresponding to the data and luminance base data having a spatial phase close to each other, which is useful as a distortion correction processing device such as a surveillance camera.
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Abstract
Description
以下、本発明の実施の形態の画像信号処理装置について、図面を用いて説明する。
図1は、本発明の実施の形態の画像信号処理装置1を示す図である。画像信号処理装置1は、画像信号を格納するフレームメモリ12と、フレームメモリ12に格納する画像信号の前処理を行う前段処理部10と、フレームメモリ12に格納された画像信号に対して巡回型ノイズ抑圧を行う巡回型ノイズ抑圧部14と、フレームメモリ12に格納された画像信号の垂直方向における歪曲収差を補正する第1の歪曲収差補正処理部(以下、「第1補正処理部」という)16と、補正処理された画像信号から輝度色信号を生成する輝度色信号生成部18と、輝度色信号の水平方向における歪曲収差を補正する第2の歪曲収差補正処理部(以下、「第2補正処理部」という)20と、補正処理された輝度色信号に対して後処理を行う後段処理部22とを有している。
CM-YG=B+G+R+B-(G+R+G)=2B-G
YM-CG=G+R+R+B-(B+G+G)=2R-G
図4の座標1の補間処理に必要な4ラインの垂直座標は、
Y(2n)、Y(2n+1)、Y(2n+2)、Y(2n+3)
である。座標2の補間処理に必要な4ラインの垂直座標は、
Y(2n-1)、Y(2n)、Y(2n+1)、Y(2n+2)
である。座標3の補間処理に必要な4ラインの垂直座標は、
Y(2n-1)、Y(2n)、Y(2n+1)、Y(2n+2)
である。
ライン単位で考えれば、座標1の処理に必要なデータと座標2の処理に必要なデータとの差分は、垂直座標Y(2n-1)とY(2n+3)で示すラインのデータである。座標2の処理でY(2n+3)で示すラインのデータは使用しないので廃棄し、新たにY(2n-1)で示すラインのデータをフレームメモリ12から読み出す。同様にライン単位で考えれば、座標2の処理と座標3の処理に必要なデータの差分はない。座標1の処理から座標2の処理に移る際には、垂直座標Y(2n-1)で示すラインのデータのみを新たにフレームメモリ12から読み出せば良い。座標2の処理から座標3の処理に移る際には、ライン単位で言えば、フレームメモリ12からデータを読み出す必要はなくなる。
1.色データ Tgt_H
2.色データ対応輝度データ(第1の輝度データ) yl_compre
3.輝度ベースデータ(第2の輝度データ) YLc
第1ラインの重み:(1.5+0.5)-1.5=0.5
第3ラインの重み:(1.5+0.5)-0.5=1.5
本実施の形態では、色データの補間演算方法は線形補間である。
なお、色データの補間は、空間位相が遠いデータを利用する必要がある。すなわち、座標PのR-G系のデータを求めるためには、隣接する第2ラインより遠い第1ラインのデータを用いる必要がある。
(1)フレームメモリ帯域とタップ数
(2)減衰量
(3)通過帯域幅
・B-Spline:
(3*t*t*t-6*t*t+4)/6 : (0<=t<1)
-(t-2)*(t-2)*(t-2)/6 : (1<=t<2)
t:補正座標点と補間計算に用いる画素との距離
・BiCubic:
(a+2)*t*t*t-(a+3)*t*t+1 : (0<=t<1)
a*t*t*t-5*a*t*t+8*a*t-4*a : (1<=t<2)
t:補正座標点と補間計算に用いる画素との距離
out = YLc + (Tgt_H - yl_compre)
10 前段処理部
12 フレームメモリ
16 第1の歪曲補正処理部
18 輝度色信号生成部
20 第2の歪曲補正処理部
22 後段処理部
24 アドレス生成部
26 色データ選択部
28 色データ生成部
30 輝度データ生成部
32 色データ対応輝度データ選択部
34 色データ対応輝度データ生成部
36 輝度ベースデータ生成部
38 補色データ生成部
100 色プレーン分解部
102 座標変換部
104 サンプリング部
106 色生成部
Claims (5)
- フィールド色差順次補色形式の画像データを格納するフレームメモリと、
予め与えられた歪曲情報に基づいて、表示すべき画面内の各画素の位置に対応する前記フレームメモリ上における各位置を示すアドレスを生成するアドレス生成部と、
前記アドレスによって特定される点の色データを、その上下にある所定数のラインに含まれる同列の画素であって補間により生成しようとする色系列と同色系列の画素の色データを補間して生成する色データ生成部と、
前記アドレスによって特定される点の第1の輝度データを、その上下にある所定数のラインに含まれる同列の画素であって補間により生成しようとする色系列と同色系列の画素の輝度データを補間して生成する色データ対応輝度データ生成部と、
前記アドレスによって特定される点の第2の輝度データを、その上下にある所定数のラインに含まれる同列の画素の輝度データを補間して生成する輝度ベースデータ生成部と、
前記アドレスによって特定される点の補色データを、前記色データと前記第1の輝度データと前記第2の輝度データとに基づいて生成する補色データ生成部と、
を備える画像信号処理装置。 - 前記補色データ生成部にて生成された補色データに基づいて、輝度色信号を生成する輝度色信号生成部と、
前記輝度色信号生成部にて生成された輝度色信号の水平方向における歪曲収差を補正する補正処理部と、
を備える請求項1に記載の画像信号処理装置。 - フレームメモリにフィールド色差順次補色形式の画像データを格納するステップと、
予め与えられた歪曲情報に基づいて、表示すべき画面内の各画素の位置に対応する前記フレームメモリ上における各位置を示すアドレスを生成するステップと、
前記アドレスによって特定される点の色データを、その上下にある所定数のラインに含まれる同列の画素であって補間により生成しようとする色系列と同色系列の画素の色データを補間して生成するステップと、
前記アドレスによって特定される点の第1の輝度データを、その上下にある所定数のラインに含まれる同列の画素であって補間により生成しようとする色系列と同色系列の画素の輝度データを補間して生成するステップと、
前記アドレスによって特定される点の第2の輝度データを、その上下にある所定数のラインに含まれる同列の画素の輝度データを補間して生成するステップと、
前記アドレスによって特定される点の補色データを、前記色データと前記第1の輝度データと前記第2の輝度データとに基づいて生成するステップと、
を備える画像信号処理方法。 - フィールド色差順次補色形式の画像データの歪曲収差を補正するためのプログラムであって、コンピュータに、
フレームメモリに前記画像データを格納するステップと、
予め与えられた歪曲情報に基づいて、表示すべき画面内の各画素の位置に対応する前記フレームメモリ上における各位置を示すアドレスを生成するステップと、
前記アドレスによって特定される点の色データを、その上下にある所定数のラインに含まれる同列の画素であって補間により生成しようとする色系列と同色系列の画素の色データを補間して生成するステップと、
前記アドレスによって特定される点の第1の輝度データを、その上下にある所定数のラインに含まれる同列の画素であって補間により生成しようとする色系列と同色系列の画素の輝度データを補間して生成するステップと、
前記アドレスによって特定される点の第2の輝度データを、その上下にある所定数のラインに含まれる同列の画素の輝度データを補間して生成するステップと、
前記アドレスによって特定される点の補色データを、前記色データと前記第1の輝度データと前記第2の輝度データとに基づいて生成するステップと、
を実行させるプログラム。 - 請求項4に記載のプログラムを記録したコンピュータ読み取り可能な記録媒体。
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