JP2018067893A - Image processing apparatus and image processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image processing apparatus which reduces the amount of data relating to transmissivity information of an information image to be superimposed, to reduce memory consumption.SOLUTION: A function unit which generates an information image to be superimposed on an input image, and transmissivity information of the information image superimposed on the input image includes: an OSD image generation unit which adds transmissivity information to some pixels in a luminance signal of the information image, and stores the information image including the luminance signal with the transmissivity information added to the pixels and the transmissivity information on a memory; and an image superimposing unit which superimposes the information image on the input image, on the basis of the transmissivity information read from the memory. The image superimposing unit superimposes pixels having no transmissivity information added thereto, of the luminance signal in the information image read from the memory, on the input image, on the basis of the transmissivity information added to the some pixels, to reduce the amount of data relating to the transmissivity information, thereby reducing memory consumption.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image processing apparatus and an image processing method.

  Digital cameras and digital video cameras are equipped with a display unit (such as a liquid crystal panel) for checking images during shooting. The display unit can display not only a captured image but also information for assisting shooting by an information image using figures, numbers, characters, or the like (hereinafter also referred to as an “OSD (On Screen Display) image”). It is. When displaying an OSD image, it is possible to set the transmissivity of the OSD image so that the OSD image does not become completely invisible due to the OSD image being hidden so that the background captured image can be seen through. There are also products.

  The transmittance of the OSD image is specified by transmittance information called alpha blending data (hereinafter also referred to as “α data”). When α data exists for each pixel of the OSD image, fine blend gradation expression is possible by controlling the transmittance for each pixel, but the image processing time and memory usage increase as the data amount increases. . As one means for solving this problem, there has been proposed an image processing apparatus that suppresses an increase in the amount of data by storing α data after run-length encoding (see, for example, Patent Document 1).

JP 2008-228168 A

  However, when alpha data is run-length encoded and held, alpha data compression processing and expansion processing are required. In addition, the α data value may not be a data value suitable for run-length encoding, and the amount of data cannot always be effectively reduced. The present invention has been made in view of such a problem, and an object of the present invention is to provide an image processing apparatus capable of reducing the amount of α data related to transmittance information and reducing the amount of memory used. To do.

  An image processing apparatus according to the present invention includes an input unit that inputs an image, a memory, an information image that is superimposed on the input image that is input by the input unit, and an information image that is superimposed on the input image. Generation means for generating transmittance information relating to a ratio, wherein the transmittance information is added to some pixels in the luminance signal of the information image, and the transmittance information is added to the some pixels; Generating means for storing the information image including the luminance signal and the transmittance information in the memory; and based on the transmittance information read from the memory, the input image input by the input means to the memory A superimposing unit that superimposes the information image read out from the memory, and the superimposing unit adds the transmittance information among luminance signals in the information image read out from the memory. Pixels not, characterized in that superimposed on the input image based on said added to a portion of the pixels the transmittance information.

  According to the present invention, an information image is generated by adding transmittance information to a smaller number of pixels than the number of luminance pixels of an image, thereby reducing the amount of data related to the transmittance information and reducing the amount of memory used. Can be reduced.

It is a figure which shows the structural example of the image processing apparatus in 1st Embodiment. It is a figure which shows the example of the data format of the image in 1st Embodiment. It is a figure which shows the addition example of the transmittance | permeability information of the image in 1st Embodiment. It is a figure which shows the addition example of the transmittance | permeability information of the image in 1st Embodiment. It is a figure which shows the addition example of the transmittance | permeability information of the image in 1st Embodiment. It is a figure which shows the structural example of the image processing apparatus in 2nd Embodiment. It is a figure which shows the structural example of the electronic device which has an image processing apparatus in this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
A first embodiment of the present invention will be described. FIG. 1 is a block diagram illustrating a configuration example of an image processing apparatus according to the first embodiment. In the first embodiment, an image processing apparatus capable of generating and outputting an image in which an information image (OSD image) using characters, graphics, or the like is superimposed on an input image will be described as an example. As illustrated in FIG. 1, the image processing apparatus according to the first embodiment includes a control unit 101, an information image (OSD image) generation unit 102, a memory 103, and an image superimposing unit 104.

  The control unit 101 controls each functional unit included in the image processing apparatus. For example, the control unit 101 instructs the OSD image generation unit 102 to generate an OSD image or to write or read the generated OSD image. In addition, the control unit 101 instructs the image superimposing unit 104 to generate a superimposed image, for example.

  The OSD image generation unit 102 performs OSD image generation processing and the like in accordance with instructions from the control unit 101. The OSD image generation unit 102 generates an OSD image such as a character or a graphic, and further generates an OSD image to which alpha blending data (α data) that is transmittance information indicating the transmittance of the OSD image is added. Write. That is, the α data is transmittance information regarding the ratio when the OSD image is superimposed. In addition, the OSD image generation unit 102 reads the luminance signal (Y), color difference signal (C), and α data of the OSD image with α data written in the memory 103 from the memory 103 and outputs it to the image superimposing unit 104.

  The image superimposing unit 104 superimposes the input image 105 and the OSD image with α data output from the OSD image generating unit 102 by compositing for each pixel according to the instruction from the control unit 101 and the value of the α data. An output image (superimposed image) 106 having no image is generated and output. The output image (superimposed image) 106 can also be an image with α data.

  The input image 105 is an image in any one of general data formats, for example, an image in a data format as shown in FIG. FIG. 2 is a diagram illustrating an example of the data format of the input image 105. Note that FIG. 2 illustrates some pixels in the input image 105, and illustrates the 0th to 7th pixels in the 0th to 3rd lines, respectively (FIGS. 3 to 5). The same). 2A to 2C, Yij represents the luminance signal (luminance component, luminance information) of the j-th pixel in the i-th line, and Cij represents the j-th pixel in the i-th line. The color difference signal (color difference component, color difference information) is shown. As shown in FIGS. 2A to 2C, the existence ratio and the center of gravity position of the luminance signal (Y) and the color difference signal (C) are different for each format.

  The data format shown in FIG. 2A halves the number of pixels (chrominance pixels) having a color difference signal (C) in both the horizontal direction and the vertical direction, and has four pixels (luminance pixels) having a luminance signal (Y). On the other hand, the YCC 4: 2: 0 format has one color difference pixel. For example, one pixel of the color difference signal C00 is provided for four luminance pixels of the luminance signals Y00, Y01, Y10, and Y11.

  The data format shown in FIG. 2B is a YCC 4: 2: 2 format in which the number of color difference pixels in the horizontal direction is halved and two color difference pixels are present for four luminance pixels. For example, one pixel of the color difference signal C00 is provided for two luminance pixels of the luminance signals Y00 and Y01, and one pixel of the color difference signal C10 is provided for two luminance pixels of the luminance signals Y10 and Y11. The data format shown in FIG. 2C is a YCC 4: 4: 4 format in which four color-difference pixels exist for four luminance pixels. For example, color difference signals C00, C01, C10, and C11 are provided for the luminance pixels Y00, Y01, Y10, and Y11, respectively.

  Next, an OSD image generation method according to this embodiment will be described with reference to FIGS. 3 to 5 are diagrams illustrating examples of OSD images with α data generated by the OSD image generation unit 102. 3 to 5, Yij represents the luminance signal (luminance component, luminance information) of the j-th pixel of the i-th line, and Cij represents the color-difference signal (color-difference component) of the j-th pixel of the i-line. , Color difference information). Aij represents α data (transmittance information) added to the j-th pixel on the i-th line.

  FIGS. 3A to 3E show examples of OSD images with α data in the YCC 4: 2: 0 format in which the data format is 4 pixels in luminance and one chrominance pixel is present. FIGS. 4A to 4E show examples of OSD images with α data in the YCC4: 2: 2 format in which the data format has four luminance pixels and two color difference pixels. FIGS. 5A to 5E show examples of OSD images with α data in the YCC4: 4: 4 format in which the data format has four luminance pixels and four color-difference pixels. Yes.

  The OSD image generation unit 102 has a function of drawing characters, graphics, and the like in accordance with instructions from the control unit 101. For characters, font data may be read, or drawing information for characters may be instructed from the control unit 101. In addition, already prepared data may be read as a graphic, or drawing information about the graphic may be instructed from the control unit 101. The OSD image generation unit 102 generates an OSD image in accordance with an instruction from the control unit 101, and then adds α data to the addition target pixel. In order to superimpose the OSD image so that it does not pass through the input image 105, it is only necessary to specify α data that makes the entire surface of the image uniformly have a transmittance of 0%.

  Here, for example, as shown in FIGS. 3B, 4B, and 5B, α data corresponding to the same number of pixels as the number of luminance pixels is added at the same center of gravity as the luminance pixels. For example, it is assumed that α data of transmittance information A00, A01, A10, and A11 is added to the luminance pixels of the luminance signals Y00, Y01, Y10, and Y11. In this way, by adding α data for the same number of pixels as the number of luminance pixels at the same centroid position as the luminance pixels, the transmittance can be controlled in a fine area and high gradation expression can be achieved. However, the amount of α data increases, and the load of image processing of the OSD image generation unit 102 that generates α data and writes it in the memory 103 is large.

  Therefore, in the present embodiment, the OSD image generation unit 102 is provided for each two luminance pixels in the horizontal direction at the same centroid position as the luminance pixels as shown in FIGS. 3 (A), 4 (A), and 5 (A). An OSD image with α data is generated by adding α data. For example, the OSD image generation unit 102 adds the α data of the transmittance information A00 to the luminance pixel of the luminance signal Y00, and adds the α data of the transmittance information A10 to the luminance pixel of the luminance signal Y10. Is generated. Thus, in the horizontal direction of the image, the transmittance information is added at a ratio of 1 pixel to 2 pixels of luminance to generate an OSD image, so that the data amount of α data is halved. Therefore, the amount of α data can be reduced, and the amount of memory used for OSD images can be reduced.

  Further, depending on the thickness (pixel width) and data value of a line or a point drawn as an OSD image, the OSD image generation unit 102 controls the pixel to which α data is added based on the OSD image, and the OSD with α data. An image may be generated. For example, when the thickness of the image element of the OSD image is 4 pixels or more and has a uniform luminance value and color difference value, the OSD image generation unit 102 performs the processes shown in FIGS. 3C, 4C, and 5C. ), Α data may be added for every four luminance pixels in the horizontal direction at the same center of gravity as the luminance pixels. For example, the OSD image generation unit 102 does not add the α data to the luminance pixels of the luminance signals Y01, Y02, and Y03, but adds the α data of the transmittance information A00 to the luminance pixels of the luminance signal Y00. An OSD image is generated.

  Further, for example, the OSD image generation unit 102, as shown in FIG. 3E, FIG. 4E, and FIG. Α data may be added every two lines. For example, the OSD image generation unit 102 does not add α data to the luminance pixels of the luminance signals Y01, Y02, Y03, Y10, Y11, Y12, and Y13, and transmits the luminance to the luminance pixels of the luminance signal Y00. An OSD image to which α data of information A00 is added is generated. In this way, when the thickness of the image element of the OSD image is 4 pixels or more and has uniform luminance values and color difference values, transmittance information is added at a ratio of 1 pixel to 4 pixels in the horizontal direction of the image. An OSD image may be generated.

  Further, for example, when the thickness is 2 pixels or more, the OSD image generation unit 102 performs the horizontal direction at the same centroid position as that of the luminance pixel as illustrated in FIGS. 3D, 4D, and 5D. The α data may be added for every two luminance pixels and every two lines in the vertical direction. For example, the OSD image generation unit 102 does not add the α data to the luminance pixels of the luminance signals Y01, Y10, and Y11, but adds the α data of the transmittance information A00 to the luminance pixels of the luminance signal Y00. An OSD image is generated. In this way, when the thickness of the image element of the OSD image is 2 pixels or more and has uniform luminance values and color difference values, the transmittance is in a ratio of 1 pixel to 2 pixels in the horizontal direction and the vertical direction of the image. An OSD image to which information is added may be generated.

  As described above, the pixel to which α data is added is controlled based on the thickness and data value of a line or a point drawn as an OSD image, and the OSD image generation unit 102 adds α data, whereby the data amount of α data is set. Can be further reduced, and the amount of memory used can be reduced. For example, the data amount of the α data and the memory usage amount are two minutes when the α data is added as shown in FIGS. 3C and 3D, as compared with FIG. 1 and when α data is added as shown in FIG. 3E, it becomes a quarter. That is, in the horizontal direction, α data is added at a ratio of one pixel to n pixels of luminance pixels. Further, in the vertical direction, α data is added at a ratio of one pixel to m pixels of luminance pixels. In this way, α data is added to a predetermined part of the luminance pixels of the OSD image, and α data is not added to other pixels. Further, α data is not added to the color difference pixels.

  Next, a method for generating a superimposed image in the present embodiment will be described. The image superimposing unit 104 superimposes the input image 105 and the OSD image for each pixel according to the following formula according to the transmittance information of the α data for each pixel, and outputs the obtained superimposed image as the output image 106. Assuming that the pixel value of the input image 105 is X0, the pixel value of the OSD image is X1, α data is A, and the pixel value of the output image 106 is Z, the image superimposing unit 104 is Z = X0 × A + X1 × (1-A) To generate a superimposed image. The superimposed image output as the output image 106 may be displayed as it is on a display unit such as a liquid crystal panel or may be further subjected to image processing.

  Here, for example, when α data is added as shown in FIG. 3A, since α data does not exist for all pixels, α data A00 is commonly used for signals Y00, Y01, and C00. That is, a pixel to which no α data is added is superimposed using the α data of an adjacent pixel or the nearest pixel among the pixels to which α data is added. Alternatively, α data A00 is used for the signals Y00 and C00. On the other hand, for the signal Y01, α data is obtained by interpolating (linear interpolation) α data A00 and α data A02 of two pixels Y00 and Y02 that are adjacent in the horizontal direction among the pixels to which α data is added. And the value of the generated α data can be used. It is also possible to switch according to the contents of the OSD image.

  Similarly, for example, when α data is added as shown in FIG. 3C, α data A00 is commonly used for the six elements Y00, Y01, Y02, Y03, C00, and C02. Alternatively, the α data A00 can be used for the signals Y00 and C00, and the α data value calculated by linear interpolation between the α data A00 and the α data A04 can be used for the others.

  According to the first embodiment, α data is added to some luminance pixels in an OSD image to generate an OSD image with α data, thereby reducing the data amount of α data and The amount of memory used can be reduced. Further, according to the present embodiment, it is possible to reduce the data amount without performing the α data compression processing and decompression processing. Note that the amount of α data may be further reduced by reducing the amount of information (number of bits) of α data to be added.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 6 is a block diagram illustrating a configuration example of an image processing apparatus according to the second embodiment. In the second embodiment, an image processing apparatus capable of generating and outputting an image in which a plurality of input images and a plurality of information images (OSD images) are superimposed will be described as an example. As shown in FIG. 6, the image processing apparatus according to the second embodiment includes a control unit 601, an information image (OSD image) generation unit 602, a memory 603, an input image selection unit 604, an image superimposition unit 606, and a storage unit 608. Have

  The control unit 601 controls each functional unit included in the image processing apparatus. Similar to the control unit 101, the control unit 601 instructs the OSD image generation unit 102 to generate an OSD image or the like, or instructs the image superimposition unit 104 to generate a superimposed image or the like. The control unit 601 controls an image selection operation in the input image selection unit 604, for example.

  The OSD image generation unit 602 generates an OSD image such as characters and graphics in accordance with an instruction from the control unit 601, generates an OSD image to which α data is added, and writes the OSD image in the memory 603. In addition, the OSD image generation unit 602 reads the OSD image with α data written in the memory 603 from the memory 603 and outputs it to the input image selection unit 604. The input image selection unit 604 selects one image from the two images of the input image 605 and the OSD image with α data output from the OSD image generation unit 602 in accordance with an instruction from the control unit 601, and sends the selected image to the image superimposing unit 606. Output. The input image 605 is an image in any one of general data formats, for example, an image in a data format as shown in FIG.

  The image superimposing unit 606 superimposes the image selected by the input image selecting unit 604 and the image output from the storage unit 608 by combining each image according to the instruction from the control unit 601 and the value of α data, and α A superimposed image having no data is generated. The superimposed image generated by the image superimposing unit 606 can be output as the output image 607 as it is, but can also be stored in the storage unit 608 and used again in the superimposing process.

  The OSD image generation method in the second embodiment is the same as that in the first embodiment. When the input image selection unit 604 selects the input image 605, the control unit 601 sets α data having the same value for all the pixels of the luminance signal in one screen of the input image 605 and performs image superimposition. To the unit 606. Further, the α data of the color difference signal of the input image 605 is set to the same value as the α data of the luminance signal, but may be set to a different value. Hereinafter, a method for generating a superimposed image in the second embodiment will be described. The image superimposing unit 606 generates a superimposed image by superimposing the output image of the input image selecting unit 604 and the output image of the storage unit 608 on a pixel-by-pixel basis according to the following formula according to the transmittance information of α data for each pixel. If the pixel value of the output image of the input image selection unit 604 is X0, the pixel value of the output image of the storage unit 608 is X1, α data is A, and the pixel value of the superimposed image is Z, Z = X0 × A + X1 × ( In 1-A), a superimposed image is generated. The superimposed image output from the image superimposing unit 606 is stored in the storage unit 608 and may be output as an output image 607 and displayed as it is on a display unit such as a liquid crystal panel, or by performing image processing. Also good.

  When the input image selection unit 604 selects the OSD image from the OSD image generation unit 602, the OSD image generation unit 602 reads the OSD image and α data from the memory 603 and outputs them. Here, as in the first embodiment, when α data is added as shown in FIG. 3A, for example, α data does not exist for all the pixels, and therefore, for signals Y00, Y01, and C00, The α data A00 is commonly used. Alternatively, the α data A00 can be used for the signals Y00 and C00, and the α data value calculated by linear interpolation between the α data A00 and the α data A02 can be used for the signal Y01. . It is also possible to switch according to the contents of the OSD image.

  Similarly, for example, when α data is added as shown in FIG. 3C, α data A00 is commonly used for the six elements Y00, Y01, Y02, Y03, C00, and C02. Alternatively, the α data A00 can be used for the signals Y00 and C00, and the α data value calculated by linear interpolation between the α data A00 and the α data A04 can be used for the others.

  In the configuration of this embodiment, the input image 605 can be generated and output without superimposing the input image 605 and only a plurality of OSD images. In that case, the input image selection unit 604 selects an OSD image and outputs the output image of the image superimposing unit 606 with the calculated α data. Then, the α data is also stored in the storage unit 608, and the α data can be updated by the arithmetic processing. For example, if the α data of the output image of the input image selection unit 604 is A0, the α data of the storage unit 608 is A1, and the α data of the output image of the image superimposing unit 606 is A2, A2 = A0 + A1 × (1−A0). It is possible to update α data by calculation. In the first calculation when a plurality of images are overlapped, the value of the α data A1 in the storage unit 608 is 0, and A2 = A0.

  According to the second embodiment, as in the first embodiment, the α data is generated by adding the α data to some luminance pixels in the OSD image to generate the OSD image with α data. The amount can be reduced and the amount of memory used for OSD images can be reduced. In addition, the amount of data can be reduced without performing compression processing and decompression processing of α data. Further, according to the present embodiment, it is possible to generate and output an image in which a plurality of input images and a plurality of OSD images are superimposed. Note that the amount of α data may be further reduced by reducing the amount of information (number of bits) of α data to be added.

  An electronic apparatus having the image processing apparatus in the above-described embodiment will be described. In the following, an imaging apparatus such as a digital camera or a video camera will be described as an example of the electronic apparatus having the image processing apparatus described above, but the present invention is not limited to this. The present invention is not limited to an imaging apparatus such as a digital camera or a video camera, and can be applied to various portable devices such as a smartphone and a tablet.

  FIG. 7 is a block diagram illustrating a configuration example of an electronic apparatus 700 having the image processing apparatus according to the present embodiment. The optical system 701 is an optical system composed of lenses and the like. The imaging element 702 has a photoelectric conversion element such as a CCD image sensor or a CMOS image sensor, photoelectrically converts the optical image formed by the optical system 701, and outputs the obtained image data. The image processing unit 703 performs various image processing related to the image data. The image processing unit 703 has, for example, the function of the image processing apparatus in the above-described embodiment, and performs a process of generating a superimposed image by superimposing a captured image and an information image (OSD image).

  A CPU (Central Processing Unit) 704 controls the operation of each block included in the electronic device 700 by reading out and executing an operation program of each block (functional unit) included in the electronic device 700 from the memory 705. Further, the CPU 704 controls part or all of the control unit 101 in FIG. 1 or the control unit 601 in FIG. 6. The memory 705 stores, for example, an operation program of each block included in the electronic device 700, and parameters necessary for the operation of each block included in the electronic device 700. The memory 705 is used as a temporary storage area for data output in the operation of each block of the electronic device 700, for example. The memory 705 is used as the memory 103 in FIG. 1 or the memory 603 in FIG.

  The operation unit 706 has switches, buttons, and the like, and sends instructions to the electronic device 700 according to user operations on them. The display unit 707 is configured by a liquid crystal panel or the like, and displays an image related to image data, or displays an image obtained by superimposing an image and an OSD image. Note that the operation unit 706 and the display unit 707 may be mounted by a touch panel or the like. The recording medium 708 is a detachable memory card or the like, for example, image data stored in the memory 705 is recorded. A bus 709 is used to exchange signals and data among the image processing unit 703, the CPU 704, the memory 705, the operation unit 706, the display unit 707, and the recording medium 708.

(Other embodiments of the present invention)
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in the computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

  The above-described embodiments are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

101, 601: Control unit 102, 602: Information image (OSD image) generation unit 103, 603: Memory 104, 606: Image superimposing unit 105, 605: Input image 106, 607: Output image (superimposed image) 604: Input image Selection unit 608: storage unit

Claims (12)

An input means for inputting an image;
Memory,
A generating unit configured to generate an information image superimposed on an input image input by the input unit and transmittance information relating to a ratio when the information image is superimposed on the input image; The transmittance information is added to some pixels in the signal, and the information image including the luminance signal in which the transmittance information is added to the some pixels and the transmittance information are stored in the memory. Generating means;
Superimposing means for superimposing the information image read from the memory on the input image input by the input means based on the transmittance information read from the memory;
The superimposing means adds pixels, to which the transmittance information is not added, among luminance signals in the information image read from the memory to the input image based on the transmittance information added to the partial pixels. An image processing apparatus characterized by superimposing.   The superimposing means uses the transmittance information added to the pixel closest to the pixel to which the transmittance information is not added among the some pixels, and the information to which the transmittance information is not added The image processing apparatus according to claim 1, wherein the images are superimposed.   The superimposing means adds the transmittance information by interpolating the transmittance information added to two pixels adjacent to the pixel to which the transmittance information is not added among the some pixels. The transmittance information for a pixel that has not been generated is generated, and the information image without the transmittance information is superimposed using the generated transmittance information. Image processing device. The input image further includes a color difference signal;
The image processing apparatus according to claim 1, wherein the generation unit does not add the transmittance information to a pixel of a color difference signal of the information image.   The generation unit adds the transmittance information to a predetermined part of pixels in the luminance signal of the information image, and does not add the transmittance information to other pixels. The image processing apparatus according to claim 1.   The image processing apparatus according to claim 4, wherein the generation unit adds the transmittance information at a ratio of 1 pixel to n pixels in a horizontal direction in a luminance signal of the information image.   The image processing apparatus according to claim 4, wherein the generation unit adds the transmittance information at a ratio of 1 pixel to m pixels in a vertical direction in a luminance signal of the information image.   The image processing apparatus according to claim 4, wherein the generation unit determines a pixel to which the transmittance information is added according to a pixel width of the information image. An input means for inputting an image;
Memory,
A generation unit that generates an information image and transmittance information related to a ratio when the information image is superimposed, the transmittance information being added to some pixels in a luminance signal of the information image, Generating means for storing the information image including the luminance signal in which the transmittance information is added to the partial pixels and the transmittance information in the memory;
A selection means for selecting one of the input image input by the input means and the information image stored in the memory;
A superimposing unit that superimposes the image selected by the selecting unit on the output image output from the superimposing unit and outputs the image as the output image;
When the selecting unit selects the information image stored in the memory, the superimposing unit converts the information image output from the selecting unit based on the transmittance information read from the memory to the output image. And superimposing pixels to which the transmittance information is not added among luminance signals in the information image read from the memory on the output image based on the transmittance information added to the partial pixels. An image processing apparatus.   The image processing apparatus according to claim 9, further comprising a control unit that generates the transmittance information for the input image and adds the transmission information to the input image when the selection unit selects the input image. An input process for inputting an image;
A generation step of generating an information image to be superimposed on the input image input in the input step and transmittance information relating to a ratio when the information image is superimposed on the input image; The transmittance information is added to some pixels in the luminance signal, and the information image including the luminance signal in which the transmittance information is added to the some pixels and the transmittance information are stored in a memory. Generation process;
A superimposition step of superimposing the information image read from the memory on the input image input in the input step based on the transmittance information read from the memory;
In the superimposing step, a pixel to which the transmittance information is not added among luminance signals in the information image read from the memory is added to the input image based on the transmittance information added to the partial pixels. An image processing method characterized by superimposing. An input process for inputting an image;
A generation step of generating an information image and transmittance information relating to a ratio when the information image is superimposed, the transmittance information being added to some pixels in a luminance signal of the information image; Generating the information image including the luminance signal in which the transmittance information is added to the some pixels and the transmittance information in a memory;
A selection step of selecting one of the input image input in the input step and the information image stored in the memory;
A superimposing step of superimposing the image selected in the selecting step on the output image output in the superimposing step and outputting the output image as the output image,
In the superimposing step, when the information image stored in the memory in the selection step is selected, the information image output in the selection step is output based on the transmittance information read from the memory. Pixels to which the transmittance information is not added among the luminance signals in the information image that are superimposed on the image and read from the memory are added to the output image based on the transmittance information added to the partial pixels. An image processing method characterized by superimposing.

Images