JP2007313148A - Endoscope processor and endoscope system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an endoscope processor generating an image allowing the discrimination of subtle recesses/projections on a subject image. <P>SOLUTION: This endoscope processor displays a part of a subject image (obj) on a monitor. A luminance display row (lrow) is set using an input unit. Luminance values along the luminance display row (lrow) are graphed and displayed on a monitor. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an endoscope processor that displays an image that can easily discriminate subtle unevenness of a subject imaged by an electronic endoscope.

  An electronic endoscope that generates an image signal based on a subject image, an endoscope processor that performs signal processing of the image signal, and a monitor that reproduces the subject image based on the image signal subjected to signal processing. There are known electronic endoscope systems. The electronic endoscope is provided with an image sensor that generates an image signal corresponding to a subject image to be received.

  Unlike conventional fiberscopes, an electronic endoscope system can display an image according to the purpose by a predetermined driving method of an image sensor or predetermined signal processing on an image signal (Patent Document 1, Patent Document 1). Patent Document 2).

In such an electronic endoscope system, it may be required to be able to discriminate subtle unevenness of a subject. However, there has not been an endoscope processor that performs image processing for displaying an image that can distinguish subtle unevenness without changing the color tone of the subject image.
Japanese Patent Laid-Open No. 11-70071 JP 2002-36995 A

  Therefore, an object of the present invention is to provide an endoscope processor that generates an image that can discriminate subtle unevenness of a subject image.

  The endoscope processor according to the present invention corresponds to a subject image in which a plurality of pixels provided on a light receiving surface of an imaging element of an electronic endoscope each generate a plurality of pixel signals generated according to the amount of received light on the light receiving surface. Pixel information for each specific pixel based on a receiving unit that receives the received image signal, a specific line specifying unit that specifies a specific line that is a specific line on the light receiving surface, and a pixel signal of a pixel that is a pixel on the specific line And a pixel information generating unit that generates a composite image signal corresponding to a composite image that displays pixel information together with the subject image on a monitor for displaying the subject image.

  In addition, it is preferable that the pixel information in the composite image is information graphed.

  Further, it is preferable that the pixel information is graphed at the same position as the first coordinate of the specific pixel corresponding to the first coordinate in the two-dimensional coordinates in the composite image.

  Further, the pixel information is preferably the luminance in the pixel.

  The specific line is preferably a straight line extending in the vertical direction or the horizontal direction of the light receiving surface.

  In addition, it is preferable that the image signal generation unit displays pixel information in a region where a part of the subject image is not displayed and is not displayed in the composite image.

  The specific line is preferably displayed on the subject image. Furthermore, it is preferable that the specific line is displayed in a dotted line shape on the subject image displayed on the monitor. Furthermore, the dotted line preferably has a white point and a black point.

  The endoscope system of the present invention is an imaging device that generates a plurality of pixel signals generated according to the amount of light received by each of a plurality of pixels provided on a light receiving surface as an image signal corresponding to a subject image received on the light receiving surface. A pixel that creates pixel information of each specific pixel based on a pixel signal in a pixel that is a pixel on the specific line, an electronic endoscope having a specific line that specifies a specific line that is a specific line on the light receiving surface An information creating unit, a monitor for displaying a subject image, and an image signal generating unit for generating a composite image signal corresponding to a composite image for displaying pixel information together with the subject image on the monitor are provided.

  According to the present invention, it is possible to display pixel information such as luminance in a specific linear shape of a subject image captured by an endoscope. Therefore, it becomes easy to discriminate subtle unevenness in the subject image based on the pixel information.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram schematically showing an internal configuration of an endoscope system having an endoscope processor to which an embodiment of the present invention is applied.

  The endoscope system 10 includes an endoscope processor 20, an electronic endoscope 11, and a monitor 12. The endoscope processor 20 is connected to the electronic endoscope 11 and the monitor 12 via a connector (not shown).

  A lamp 21 for illuminating a subject (not shown) is provided inside the endoscope processor 20. Light emitted from the lamp 21 is irradiated to the subject via a light guide 13 provided inside the electronic endoscope 11.

  The irradiated subject is imaged by an imaging element 14 such as a CCD provided in the electronic endoscope 11. Pixels (not shown) are arranged in a matrix of 480 rows and 1000 columns in the effective pixel region on the light receiving surface of the image sensor 14. Each pixel is covered with a complementary color filter (not shown), and a pixel signal corresponding to the amount of received light of the complementary color component is generated.

  One frame of video signal is formed by an ODD field video signal and an EVEN field video signal. That is, the video signal in the ODD field is formed by pixel signals generated by the pixels arranged in odd rows. The video signal in the EVEN field is formed by pixel signals generated by pixels arranged in even rows.

  In the ODD field, pixel signals generated from the pixels in the first, third, fifth,..., 479th rows from the top in the image sensor 14 are 1, 2, 3, ..., recognized as a pixel signal in the pixels of the 240th row.

  In the EVEN field, the pixel signals generated from the pixels in the second, fourth, sixth,..., 480th rows in the image sensor 14 are 1, 2, 3,. It is recognized as a pixel signal in the pixels of the 240th row.

  An image signal generated by the image sensor 14 is transmitted to the endoscope processor 20. The endoscope processor 20 includes a CCD process circuit 22, an A / D converter 23, a luminance value display circuit 30, a primary color signal generation circuit 24, an RGB memory 25, a D / A converter 26, a video process circuit 27, and the like. . The A / D converter 23, the luminance value display circuit 30, the primary color signal generation circuit 24, and the like are 10-bit digital arithmetic units, and can calculate 1024 gradation data.

  First, the image signal is received by the CCD process circuit 22. In the CCD process circuit 22, an image signal composed of a complementary color signal component is converted into an image signal composed of a luminance signal component and a color difference signal component. In the CCD process circuit 22, predetermined signal processing such as white balance processing and γ correction processing is performed on the image signal. The image signal subjected to the predetermined signal processing is output to the A / D converter 23 and converted from an analog signal to a digital signal.

  The image signal converted into the digital signal is input to the luminance value display circuit 30. The luminance value display circuit 30 performs luminance display processing for generating a luminance value display image for displaying the luminance values of the pixels in the row designated by the user, as will be described later.

  The image signal subjected to the luminance display process is output to the primary color signal generation circuit 24. It is also possible to display only the subject image without displaying the luminance value. When displaying only the subject image, the image signal is output to the primary color signal generation circuit 24 without performing the luminance display processing.

  In the primary color signal generation circuit 24, the luminance signal component and the color difference signal component of the image signal are converted into RGB signal components. The RGB signal component of each pixel is output to the RGB memory 25. The RGB memory 25 is provided with storage areas for signal components for each of R, G, and B. The RGB signal components are stored in the respective storage areas.

  The image signal stored in the RGB memory 25 is output to the D / A converter 26 and converted from a digital signal to an analog signal. The image signal converted into the analog signal is encoded in the video process circuit 27. The encoded video signal is output to the monitor 12 and an image corresponding to the video signal is displayed on the monitor 12. For example, a display device having 525 horizontal scanning lines is used for the monitor 12 of the endoscope system 10.

  As described above, a maximum subject image can be displayed on the monitor 12 as shown in FIG. When displaying the maximum subject image, the subject image obj is displayed between the 1st to 480th horizontal scanning lines. In addition, between the 481-525th horizontal scanning lines, for example, information on a video signal such as a file name and time is displayed.

  Alternatively, as shown in FIG. 3, the monitor 12 can also display the luminance value in the luminance display row lrow, which is a row specified by the user, together with the subject image obj as a graph (see symbol gra). When the luminance value is displayed in a graph, a part of the subject image obj is displayed between the 1st and 250th horizontal scanning lines, and a graph is displayed between the 251st and 480th horizontal scanning lines. The Switching the display of the monitor 12 and specifying the luminance display row lrow, which is a row for displaying the luminance value, can be executed by an operation input to the input unit 28.

  FIG. 4 is a block diagram schematically showing the internal configuration of the luminance value display circuit 30. The luminance value display circuit 30 includes a selection circuit 31, an ODD memory 32, an EVEN memory 33, a timing generator 34, a horizontal counter 35, a vertical counter 36, and the like.

  A subject pixel signal which is a pixel signal input from the A / D converter 23 to the luminance value display circuit 30 has a color difference signal component and a luminance signal component. A subject color difference signal which is a color difference signal component of the subject pixel signal is sent to the selection circuit 31. A subject luminance signal that is a luminance signal component of the subject pixel signal is sent to the selection circuit 31, the ODD memory 32, and the EVEN memory 33.

  Writing and reading of the subject luminance signal to and from the ODD memory 32 and the EVEN memory 33 are controlled by the timing generator 34. Further, by being controlled by the timing generator 34, a luminance signal component and a color difference signal component for displaying a subject image or a luminance value are output from the selection circuit 31 to the primary color signal generation circuit 24.

  The luminance value display circuit 30 is supplied with a pixel clock signal, a horizontal synchronization signal, a vertical synchronization signal, and a field determination signal which are square waves as shown in FIG. 5 from the A / D converter 23 together with the subject pixel signal.

  Pixel signals of pixels arranged in the same row on the light receiving surface of the image sensor 14 are input to the CCD process circuit 22 in order from right to left. When the pixel signal from the pixel in the last column of the row is input, the pixel signal of the pixel arranged in the next row of the same field starts to be input. Pixel signals are input in order from the top to the bottom row.

  The pixel clock signal is a signal that defines the pixel signal of a single pixel, and the subject pixel signal between the HIGH and LOW 1 cycles is input to the luminance value display circuit 30 as a single subject pixel signal.

  The horizontal synchronization signal is a signal that defines a subject pixel signal of pixels arranged in a single row among pixel signals that are continuously input. While the horizontal synchronizing signal is HIGH, HIGH / LOW of the pixel clock signal is switched by the number of times twice the number of columns of pixels arranged in the horizontal direction. Accordingly, the subject pixel signals of all the pixels arranged in the same row are input to the luminance value display circuit 30 while the horizontal synchronization signal is HIGH.

  The vertical synchronization signal is a signal that defines a subject pixel signal input in a single field period among pixel signals input continuously. While the vertical synchronization signal is HIGH, the HIGH / LOW of the horizontal synchronization signal can be switched by the number of times twice the number of rows of pixels in the ODD field or EVEN field. Therefore, the subject pixel signals of all the pixels in the ODD field or EVEN field are input to the luminance value display circuit 30 while the vertical synchronization signal is HIGH.

  The field determination signal is a signal for determining the period of the ODD field and the period of the EVEN field. When the field determination signal is switched from HIGH to LOW and from LOW to HIGH, the vertical synchronization signal is switched to LOW. A period in which the vertical synchronization signal is HIGH when the field determination signal is HIGH is recognized as an ODD field period. The period in which the vertical synchronization signal is HIGH when the field determination signal is LOW is recognized as the period of the EVEN field.

  The pixel clock signal and the horizontal synchronization signal are input to the horizontal counter 35. The number of times that the pixel clock signal becomes HIGH is counted by the horizontal counter 35. The number counted by the horizontal counter 35 is reset to zero when the horizontal synchronizing signal becomes LOW. Accordingly, the horizontal counter 35 detects the column number of the pixel corresponding to the subject pixel signal. The detected column number is sent to the timing generator 34 as a column number signal.

  The horizontal synchronization signal and the vertical synchronization signal are input to the vertical counter 36. The vertical counter 36 counts the number of times that the horizontal synchronization signal becomes HIGH. The number counted by the vertical counter 36 is reset to zero when the vertical synchronizing signal becomes LOW. Accordingly, the vertical counter 36 detects the row number of the pixel corresponding to the subject pixel signal. The detected line number is sent to the timing generator 34 as a line number signal.

  As described above, the field generator signal is input to the timing generator 34 together with the row number signal and the column number signal. Further, the luminance display row lrow specified by the input operation to the input unit 28 is also input to the timing generator 34 as a display row signal.

  Based on the column number signal, the row number signal, the field determination signal, and the display row signal, the timing generator 34 generates an ODD write signal, an ODD read signal, an EVEN write signal, and an EVEN read signal. The ODD write signal and ODD read signal are output to the ODD memory 32, and the EVEN write signal and EVEN read signal are output to the EVEN memory 33. The row number signal is output from the timing generator 34 to the selection circuit 31.

  The timing for storing the subject luminance signal in the ODD memory 32 is determined by the ODD write signal. The timing for outputting the memory luminance signal, which is the subject luminance signal stored in the ODD memory 32, is determined by the ODD read signal.

  The timing for storing the subject luminance signal in the EVEN memory 33 is determined by the EVEN write signal. The timing for outputting the memory luminance signal, which is the subject luminance signal stored in the EVEN memory 33, is determined by the EVEN read signal.

  As shown in FIG. 6, the ODD write signal is generated when the field discrimination signal is HIGH and the row number corresponding to the row number signal matches the luminance display row. The ODD read signal is generated when the field determination signal is LOW and the row number corresponding to the row number signal is greater than or equal to the luminance display row.

  As shown in FIG. 7, the EVEN write signal is generated when the field determination signal is LOW and the row number corresponding to the row number signal matches the luminance display row. The EVEN readout signal is generated when the field determination signal is HIGH and the row number of the pixel signal is greater than or equal to the luminance display row.

  The ODD memory 32 and the EVEN memory 33 are provided with areas for separately storing subject luminance signals of pixels arranged in a single row. The ODD memory 32 is used for storing the subject luminance signal in the ODD field, and the EVEN memory 33 is used for storing the subject luminance signal in the EVEN field.

  The column number signal is also output to the ODD memory 32 while the ODD write signal or ODD read signal is HIGH. Based on the column number signal when the ODD write signal is HIGH, the subject luminance signal is stored in an area corresponding to the column number in the ODD memory 32. Further, a memory luminance signal is output to the selection circuit 31 from an area corresponding to the column number in the ODD memory 32 based on the column number signal when the ODD read signal is HIGH.

  The column number signal is also output to the EVEN memory 33 while the EVEN write signal or EVEN read signal is HIGH. Based on the column number signal when the EVEN write signal is HIGH, the subject luminance signal is stored in an area corresponding to the column number in the EVEN memory 33. Further, a memory luminance signal is output to the selection circuit 31 from an area corresponding to the column number in the EVEN memory 33 based on the column number signal when the EVEN read signal is HIGH.

  A detailed configuration of the selection circuit 31 will be described with reference to FIG. FIG. 8 is a block diagram showing a schematic configuration of the selection circuit 31. The selection circuit 31 includes a selector 31s, a discriminator 31j, a calculator 31a, and a ROM 31m.

  The row number signal input to the selection circuit 31 is input to the calculator 31a and the discriminator 31j. In the calculator 31a, a display signal used for displaying the luminance value is generated based on the row number signal. The display signal is output to the discriminator 31j and the selector 31s. The display signal is generated by calculating (480−line number corresponding to line number signal) × {1024 ÷ (480−250)}.

  The memory luminance signal sent from the ODD memory 32 and the EVEN memory 33 to the selection circuit 31 is input to the discriminator 31j. Further, the row number signal and the display signal are input to the discriminator 31j as described above. Further, a field discrimination signal input to the luminance value display circuit 30 is also input to the discriminator 31j.

  In the discriminator 31j, based on the row number signal and the field discrimination signal, a graphed luminance value indicating whether the number of horizontal scanning lines corresponding to the subject pixel signal is 1 to 250 rows displaying the subject image. It is determined which of the 251 to 480 lines displays the brightness or the brightness display line.

  When the number of horizontal scanning lines is between 251 and 480, the discriminator 31j further discriminates the magnitude relationship between the signal intensity of the display signal and the signal intensity of the memory luminance signal.

  Based on the discrimination result, a control signal corresponding to the discrimination result is output from the discriminator 31j to the selector 31s. Further, the subject luminance signal and the subject color difference signal are input to the selector 31s. Furthermore, a display signal is also input from the calculator 31a to the selector 31s.

  A ROM 31m is connected to the selector 31s. The ROM 31m stores a black luminance signal with a signal intensity of zero, a white luminance signal with a signal intensity of 1024, and an achromatic color difference signal with a signal intensity of 512. The black luminance signal, the white luminance signal, and the achromatic color difference signal stored in the ROM 31m are input to the selector 31s.

  The selector 31s selects the luminance signal component of each pixel to be displayed on the monitor 12 based on the control signal from the subject luminance signal, black luminance signal, white luminance signal, and display signal. The selector 31s selects either the subject color difference signal or the achromatic color difference based on the control signal as the color difference signal component of each pixel to be displayed on the monitor 12. The selected signal is output from the selector 31s to the primary color signal generation circuit 24.

  When the number of horizontal scanning lines corresponding to the subject pixel signal is other than the luminance display row and is any one of 1 to 250, the subject luminance signal and the subject color difference signal are the luminance of the pixel in the monitor 12. The signal component and the color difference signal component are output. Therefore, the subject image captured by the image sensor 14 is displayed as it is in the 1st to 250th lines other than the luminance display line (see FIG. 3).

  When the number of horizontal scanning lines corresponding to the subject pixel signal is a luminance display row, a white luminance signal and an achromatic color difference signal are output as a luminance signal component and a color difference signal component for each pixel every four pixels. The In addition, a black luminance signal and an achromatic color difference signal are output as a luminance signal component and a color difference signal component of each pixel to a pixel adjacent to one side of the pixel that has output the white luminance signal. A subject luminance signal and a subject color difference signal are output as a luminance signal component and a color difference signal component of each pixel with respect to a pixel sandwiched between a pixel that has output a black luminance signal and a pixel that has output a white luminance signal. Therefore, a dotted line that repeats the black point bp and the white point wp is displayed on the subject image in the luminance display row (see FIG. 9).

  When the number of horizontal scanning lines corresponding to the subject pixel signal is any one of 251 to 480 and the signal intensity of the display signal exceeds the signal intensity of the memory luminance signal, the black luminance signal and the achromatic color difference signal Are output as a luminance signal component and a color difference signal component in the pixel.

  When the number of horizontal scanning lines corresponding to the subject pixel signal is any one of 251 to 480 and the signal intensity of the display signal is less than or equal to the signal intensity of the memory luminance signal, the display signal and the achromatic color difference signal Are output as a luminance signal component and a color difference signal component in the pixel.

  As described above, the luminance values in the luminance display row are displayed in a graph between the 251 to 480 horizontal scanning lines of the monitor 12. The luminance value is set so that the 480th line is at a zero level and the 251st line is at a 1024 level. Therefore, the level of the luminance value of the graph displayed on the nth row (251 ≦ n ≦ 480) horizontal scanning line is (480−n) × {1024 ÷ (480−250)}, and the row number is n. It agrees with the signal strength of the display signal.

  Pixels whose signal intensity of the display signal on the horizontal scanning line of the nth row (251 ≦ n ≦ 480) is higher than the memory luminance signal, that is, the luminance signal component in the luminance display row, are displayed in black (see FIG. 3). . Further, an achromatic color having the display signal as a luminance value is displayed on a pixel whose signal intensity of the display signal on the horizontal scanning line of the same nth row is equal to or lower than the luminance signal component in the luminance display row (FIG. 3). reference).

  According to the endoscope processor of the present embodiment as described above, it is possible to graph and display the luminance in the row designated in the subject image. Therefore, it is possible to discriminate subtle unevenness of the subject image that can be read out due to the difference in luminance. Further, since the graphed luminance is displayed together with the subject image, comparison of the subject images is facilitated.

  In the present embodiment, the luminance values of the pixels arranged in a specific row are displayed in a graph, but the intensity of any RGB light component, the intensity of the color difference signal, or the surrounding pixels in each pixel The numerical information corresponding to each pixel such as a difference value such as the luminance of the image may be displayed.

  In the present embodiment, the luminance value of the pixels arranged in a specific row is displayed. However, the luminance value of the pixels arranged in a specific column may be displayed. Furthermore, the configuration is not limited to the row direction and the column direction, and may be configured to display luminance values of pixels arranged on a curved line as well as a straight line.

  In the present embodiment, the luminance value is graphed. However, any display method may be used as long as the luminance level according to the pixel position is displayed.

  Further, in the present embodiment, a part of the subject image is hidden, and the luminance value graphed is displayed in the hidden region. However, the subject image is not hidden and the upper portion of the subject image is not displayed. The brightness value graphed may be displayed on the screen.

  Further, in the present embodiment, the luminance value graphed between the 251st to 480th lines of the monitor 12 is displayed, but it may be displayed between the subject images, and displayed between any lines. May be. For example, the subject image may be displayed in the 1st to 100th lines and the 331 to 480th lines, and the luminance values graphed in the 101st to 330th lines may be displayed.

  In the present embodiment, the luminance display row is displayed on the monitor 12, but it may not be displayed. However, the displayed configuration is preferable for comparing with the subject image.

  In the present embodiment, the luminance display row is displayed as a dotted line, but it may be a solid line or any other line. However, a configuration in which a subject image is also displayed in a dotted line shape is preferable for comparison with the subject image.

  In this embodiment, a white point and a black point are used for the dotted line for indicating the luminance display row. However, any other color point or a single color point may be used. However, the configuration using two color points improves the visibility. This is because even when the color of one point is the same color as the subject, it is easy to visually recognize the point of the other color.

  Further, in the present embodiment, the display signal is a signal calculated by the above formula, but any formula may be used as long as the intensity is changed according to the row of the monitor 12. However, it is preferable to use an expression that matches the maximum value of the luminance level in the upper part of the area displaying the graph and the lowest value of the luminance level in the lower part of the area displaying the graph.

  In the present embodiment, the image sensor 14 is configured to be provided with pixels of 480 rows and 1000 columns, but any number of pixels may be arranged in any manner as long as the pixels are arranged in a two-dimensional manner. .

  In the present embodiment, each pixel of the image sensor 14 is covered with a complementary color filter, but may be covered with a primary color filter.

  In the present embodiment, the monitor 12 having 525 horizontal scanning lines is used. However, any number of horizontal scanning lines may be used.

  In the present embodiment, the video signal information is displayed on lines 481 to 525 of the monitor 12, but the entire screen may be used for displaying a subject image and a graph without being displayed. Good.

1 is a block diagram schematically showing an internal configuration of an endoscope system having an endoscope processor to which an embodiment of the present invention is applied. FIG. It is a figure which shows the display surface of the monitor which displayed the to-be-photographed image at the maximum. It is a figure which shows the display surface of the monitor which displayed the graph of a to-be-photographed image and a luminance value. It is a block diagram which shows roughly the internal structure of a luminance value display circuit. It is a timing chart which shows the output timing of a pixel clock signal, a horizontal synchronizing signal, a vertical synchronizing signal, and a field discrimination signal. It is a timing chart which shows the generation timing of an ODD write signal and an ODD read signal. It is a timing chart which shows the generation timing of an EVEN write signal and an EVEN read signal. It is a block diagram which shows the schematic structure of a selection circuit. It is the enlarged view which expanded and displayed the dotted line in a brightness | luminance display line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Endoscope system 12 Monitor 14 Image pick-up element 20 Endoscope processor 22 CCD process circuit 23 A / D converter 27 Video process circuit 28 Input unit 30 Luminance value display circuit 31 Selection circuit 31a Calculator 31j Discriminator 31m ROM
31s selector 32 ODD memory 33 EVEN memory 34 timing generator 35 horizontal counter 36 vertical counter gra graph display llow luminance display line obj subject image

Claims (10)

Reception that receives a plurality of pixel signals generated according to the amount of light received by each of a plurality of pixels provided on a light receiving surface of an imaging element of an electronic endoscope as an image signal corresponding to a subject image received on the light receiving surface. And
A specific line designating unit for designating a specific line that is a specific line on the light receiving surface;
A pixel information creation unit that creates pixel information of each specific pixel based on the pixel signal in the specific pixel that is the pixel on the specific line;
An endoscope processor, comprising: a monitor for displaying the subject image; and an image signal generation unit that generates a composite image signal corresponding to a composite image that displays the pixel information together with the subject image.   The endoscope processor according to claim 1, wherein the pixel information is graphed information in the composite image.   3. The internal view according to claim 2, wherein the pixel information is graphed at the same position as the first coordinate of the specific pixel to which the first coordinate in the two-dimensional coordinate in the composite image corresponds. Mirror processor.   The endoscope processor according to any one of claims 1 to 3, wherein the pixel information is luminance in the pixel.   The endoscope processor according to any one of claims 1 to 4, wherein the specific line is a straight line extending in a vertical direction or a horizontal direction of the light receiving surface.   6. The image signal generation unit according to claim 1, wherein a part of the subject image is not displayed in the composite image, and the pixel information is displayed in the non-displayed area. The endoscope processor according to item 1.   The endoscope processor according to any one of claims 1 to 6, wherein the specific line is displayed on the subject image.   The endoscope processor according to claim 7, wherein the specific line is displayed in a dotted line shape on the subject image displayed on the monitor.   The endoscope processor according to claim 8, wherein the dotted line has a white point and a black point. An electronic endoscope having an imaging element that generates a plurality of pixel signals generated by each of the plurality of pixels provided on the light receiving surface according to the amount of received light as an image signal corresponding to a subject image received on the light receiving surface; ,
A specific line designating unit for designating a specific line that is a specific line on the light receiving surface;
A pixel information creation unit that creates pixel information of each specific pixel based on the pixel signal in the specific pixel that is the pixel on the specific line;
A monitor for displaying the subject image;
An endoscope system comprising: an image signal generation unit that generates a composite image signal corresponding to a composite image that displays the pixel information together with the subject image on the monitor.

Images