JP2011013334A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device capable of intelligibly displaying what part of a reference image or an evaluation image is enlarged when enlarging the reference image or the evaluation image in the image display device provided with an image-comparing tool.SOLUTION: The image display device includes: a difference point detecting part 12 which detects a difference point between a first image and a second image; a comparison image forming part 14 which superimposes an image of presenting the difference point onto the first image and forms a comparison image; a range indicating part 13 which indicates display ranges of the first image and the second image; an image superimposing part 15 which superimposes the image of presenting the range indicated in the comparison image; an image enlarging part 16 which respectively enlarges ranges of the first image and the second image; and a display part 17 which displays the superimposed comparison image and the enlarged image.

Description

  The present invention relates to an image display device that displays a comparison image between a reference image and an evaluation image.

  As a conventional image display device equipped with an image comparison tool, the reference image that is the original image and the evaluation target evaluation are evaluated by evaluation scales such as blurring, block distortion, noise, and flicker, and PSNR (Peak Signal-to-Noise Ratio). There is known an image display device that compares and evaluates image quality of an image and displays a comparison image as a comparison result together with a reference image and an evaluation image (see Non-Patent Document 1).

“Analytical Image Quality Evaluation Tool VQ-1000”, [online], Nikon System, Inc. [Search May 1, 2009], Internet <URL: http://www.nikon-sys.co.jp/products /pdf/VQ-1000.pdf>

  However, the conventional image display apparatus displays the same range of the reference image, the evaluation image, and the comparison image in independent display windows. For this reason, when the user changes the display enlargement ratio of each image, there is a problem that it is difficult to determine which part of the reference image or the evaluation image is the enlarged image.

  The present invention has been made in view of the above-described points, and in an image display apparatus provided with an image comparison tool, when a reference image or an evaluation image is enlarged, it is easy to understand which part is an enlarged image. An object of the present invention is to provide an image display device capable of doing so.

  The present invention has been made in order to solve the above-described problem, and a difference point detection unit that detects a difference point between a first image and a second image, and an image indicating the difference point as the first image. A comparison image generation unit that generates a comparison image by superimposing, a range specification unit that specifies a display range of the first image and the second image, and an image that superimposes an image indicating the specified range on the comparison image A superimposing unit; an image enlarging unit that magnifies each of the ranges of the first image and the second image; and a display unit that displays the superimposed comparative image and the enlarged image. This is an image display device.

  In the present invention, the range specifying unit specifies a first range including a part of the difference, and then specifies a second range including a part of the difference outside the first range. An image display device characterized by the above.

  Further, the present invention is the image display device, wherein the comparison image generation unit superimposes an image showing a range including the difference point on the comparison image.

  Further, the present invention is the image display device characterized in that the comparative image generation unit makes the image showing the difference point an image having a color different from the periphery of the difference point.

  According to the present invention, the image display device displays a comparison image on which an image indicating a display range is superimposed, a reference image, and an evaluation image. As a result, the image display device displays to the user which part of the reference image or the evaluation image is an enlarged image.

It is a block diagram which shows the structure of the image display apparatus in one Embodiment of this invention. It is a figure explaining the reference image, evaluation image, difference image, and comparison image in one Embodiment of this invention. It is a figure which shows the example of the navigator screen in one Embodiment of this invention. It is a figure which shows the example of a display of the reference and evaluation screen in one Embodiment of this invention. It is a flowchart which shows operation | movement of the image display apparatus in one Embodiment of this invention.

  An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an image display apparatus according to an embodiment of the present invention. The image display device 10 includes an input unit 11, a difference point detection unit 12, a range specification unit 13, a comparative image generation unit 14, an image superimposition unit 15, an image enlargement unit 16, and a display unit 17. The difference detection unit 12, the range specification unit 13, the comparison image generation unit 14, the image superimposition unit 15, and the image enlargement unit 16 are configured by a CPU, a ROM, a RAM, and the like. By reading and executing a predetermined program stored in the ROM, the functions of the above units are realized.

  The input unit 11 receives image data of a reference image and image data of an evaluation image. The reference image is an image serving as a reference for comparison, and an example thereof is shown in FIG. The evaluation image is an image to be compared with the reference image, and an example thereof is shown in FIG. The input unit 11 outputs the input image data of the reference image to the difference point detection unit, the comparison image generation unit, and the image enlargement unit, and outputs the image data of the evaluation image to the difference point detection unit and the image enlargement unit.

  In addition, various operation instruction data such as an enlargement range designation position, an enlargement range designation size, an enlargement ratio, and a difference point search instruction are input to the input unit by a user operation. Here, the enlargement range designation position data is a value that designates the position of the range to be enlarged and displayed in the reference image or the evaluation image (for example, the vertex coordinates of the upper left corner of the range), and the enlargement range designation size data is the range. Is the value that specifies the size (number of pixels in the vertical and horizontal directions), and the enlargement ratio data specifies the ratio of expanding the range (for example, when the enlargement ratio is 200%, the range is expanded twice) The value to be

  The difference point search instruction is an instruction for searching and displaying a portion (difference point) where a difference between the reference image and the evaluation image exists. Of these operation instructions, the input unit 11 outputs the operation instruction data of the enlargement range designation position, the enlargement range designation size, and the difference search instruction to the range designation unit, and the operation instruction data of the enlargement ratio is output to the image enlargement unit 16. Output to.

  The difference detection unit 12 acquires the image data of the reference image and the image data of the evaluation image from the input unit 11, and detects the difference between the reference image and each pixel value of the evaluation image. A difference image represented by the detected difference point is generated. Then, the difference point detection unit 12 outputs the generated difference image to the comparison image generation unit 14, and also outputs position data (coordinate values) indicating the position of the difference point in the difference image to the range specification unit 13. .

  This will be specifically described with reference to FIG. FIG. 2 is a diagram illustrating a reference image, an evaluation image, a difference image, and a comparison image according to an embodiment of the present invention. Error locations 31 and 32 that do not exist in the reference image 20 shown in FIG. 2A are included in the upper left portion and the lower center portion of the evaluation image 30 shown in FIG. In this case, by comparing the pixel values of the reference image 20 and the evaluation image 30, these two error points are detected as difference points, and include two difference points 41 and 42 as shown in FIG. A difference image is generated.

  In addition, as a method of detecting the difference between the reference image and the evaluation image, for example, a method of comparing RGB components or YUV components of the image by PSNR, or a difference between pixel values of both images is equal to or greater than a predetermined threshold value. It is possible to apply a method for determining whether or not. Further, when detecting, the presence / absence of a difference is determined not in units of pixels but in units of blocks of, for example, 8 pixels × 8 pixels, and if even one pixel is included in the block, the entire block is determined as a difference. You may make it do.

  The comparison image generation unit 12 acquires the image data and the difference image of the reference image from the input unit 11 and the difference point detection unit 12, respectively, and superimposes the image obtained by converting the color and luminance of the difference image on the acquired reference image. A comparison image is generated, and the obtained comparison image is output to the image superimposing unit 15. As a difference image conversion method, for example, the color of the difference image is different from the peripheral portion of the portion corresponding to the difference point in the reference image so that the difference point exists in the generated comparison image. Or a method of converting the luminance of the difference image into bright luminance, or converting the luminance of the reference image into dark luminance. In this way, a comparison image as shown in FIG. 2D is obtained in which the difference between the reference image and the evaluation image (images 101 and 102 showing the difference points) is expressed.

  When the size of each difference point included in the difference image is small (for example, each difference point is composed of one pixel), when the user views the comparison image generated as described above, It is considered that the size may be too small for the user to find a difference. Therefore, the comparative image generation unit 14 further refers to an image indicating the position of each difference point included in the difference image (for example, images 106 and 107 indicating a range including the difference point shown in FIG. 2E) as a reference image. The image obtained by superimposing the image may be used as a comparative image.

  The range specifying unit 13 is configured to display a reference image and an evaluation image to be displayed on the display unit 17 in accordance with position data indicating the position of the difference point obtained from the difference point detection unit 12 and operation instruction data by the user obtained from the input unit 11. The display range is designated, and the display range is instructed to the image superimposing unit 15 and the image enlarging unit 17. The display range designation method has the following two modes depending on whether the operation instruction data for the enlargement range designation position is acquired from the input unit 11 or the difference point search instruction data is acquired.

  First, when the operation instruction data for the enlargement range designation position is acquired, the range designation unit 13 sets the range determined by the two operation instruction data of the enlargement range designation position and the enlargement range designation size acquired from the input unit 11 as the display range. . For example, if the user designates the vertex coordinates (100, 200) of the upper left corner of the display range as the enlargement range designation position, and designates the number of vertical pixels as 60 and the number of horizontal pixels as 80 as the enlargement range designation size. The display range is a rectangular range surrounded by the following four points (100, 200), (180, 200), (100, 260), and (180, 260). In this mode, the user can arbitrarily determine the display range.

  On the other hand, when the difference point search instruction data is acquired, the range specification unit 13 displays a range determined by the position data of the difference point acquired from the difference point detection unit 12 and the enlarged range specification size data acquired from the input unit 11. Range. For example, assuming that the central coordinates (100, 200) of the difference point are obtained as the position data of the difference point, and the user specifies the number of vertical pixels as 60 and the number of horizontal pixels as 80 as the enlargement range specification size, display The range is a rectangular range surrounded by the following four points (60, 170), (60, 230), (140, 170), and (140, 230). In this mode, the range including the location where the difference exists is automatically selected as the display range.

  In the latter mode, when position data of a plurality of difference points is acquired from the difference point detection unit 12, the range specifying unit 13 sequentially executes the next time the difference point search instruction data is input by the user. The display range is determined using the position data of the difference points. The difference image shown in FIG. 2C will be specifically described as an example.

  FIG. 3 is a diagram showing an example of a navigator screen in one embodiment of the present invention. First, assume that the user inputs difference point search instruction data by operating the Next button 104 in FIG. In response to this, the range specifying unit 13 determines the display range so as to include the difference 41, for example. Next, when the user operates the Next button 104 again, the range specifying unit 13 determines the display range so as to include the next difference 42. Furthermore, when the user inputs difference point search instruction data by operating the Previous button 105 in FIG. 3, the range specifying unit 13 determines the display range so as to include the previous difference point 41. In this way, each time the user inputs the difference point search instruction data, the display range is switched so that different difference points are displayed one after another.

  The image enlarging unit 16 acquires the image data of the reference image, the image data of the evaluation image, and the operation instruction data of the enlargement ratio from the input unit 11, and receives the display range instruction data from the range specifying unit 13. Then, the image enlarging unit 16 cuts out the portion of the display range instructed by the range specifying unit 13 from each of the reference image and the evaluation image, enlarges the cut-out image at the acquired enlargement ratio, and enlarged reference The image data of the image and the image data of the evaluation image are output to the display unit 17 as a reference / evaluation screen. FIG. 4 is a diagram showing a display example of a reference / evaluation screen in one embodiment of the present invention.

  The image superimposing unit 15 superimposes an image indicating the display range instructed by the range specifying unit 13 on the comparison image acquired from the comparative image generating unit 14, and outputs the obtained superimposed image to the display unit as a navigator screen. A rectangular image 103 in FIG. 3 is an image showing the display range instructed by the range specifying unit.

  As can be seen from FIG. 3, the display range of the reference image and the evaluation image displayed on the reference / evaluation screen matches the range of the rectangular image 103 superimposed on the comparison image displayed on the navigator screen. Therefore, the user can easily grasp which part of the entire image (comparison image of the navigator screen) is the reference image and the evaluation image that are enlarged and displayed on the reference / evaluation screen by looking at the navigator screen. Is possible.

  The navigator screen also displays an enlargement range designation position, an enlargement range designation size, an enlargement ratio, a Next button 104, a Previous button 105, and the like.

  Next, the operation of the image display device will be described. FIG. 5 is a flowchart showing the operation of the image display apparatus 10 according to the embodiment of the present invention.

  The input unit 11 acquires the image data of the reference image and the image data of the evaluation image, and outputs these (Step S1). The difference point detection unit 12 detects a difference point between the reference image and the evaluation image, and generates a difference image (step S2). The comparison image generation unit 14 generates a comparison image by superimposing an image indicating a difference point (an image indicating a range including the difference point) on the reference image (step S3).

  The range specifying unit 13 determines whether or not the difference point search instruction data from the user has been input (step S4). When the difference point search instruction data is not input (step S4-NO), the range designating unit 13 displays a range determined by the enlarged display range position designated by the user and the enlarged display range size (enlarged display rate). The range is designated (step S5). On the other hand, when the difference point search instruction data is input (step S4-YES), the range designating unit 13 sets the difference as the enlarged display range position, and sets a range determined by this and the enlarged display range size (enlarged display rate). The display range is designated (step S6).

  The image enlargement unit 16 enlarges the reference image in the display range, and generates an enlarged reference image. Similarly, the image enlarging unit 16 enlarges the evaluation image and generates an enlarged evaluation image. The display unit 17 displays the enlarged reference image and evaluation image on the “reference image and evaluation image screen (window)” as a reference / evaluation screen (step S7).

  Furthermore, the image superimposing unit 15 superimposes an image indicating the display range on the comparison image. The display unit 17 displays the enlarged display rate, the enlarged display range position, the enlarged display range size, the comparison image, the Next button, and the Previous button on the “navigator screen (window)” (step S8).

  Next, the image display device 10 determines whether or not end instruction data has been input (step S9). When the end instruction data is not input (step S9—NO), the image display device 10 returns to step S4. When the end instruction data is input (step S9—YES), the image display device 10 ends the process.

  As described above, according to the embodiment of the present invention, the image display device 10 displays the comparison image in which the image indicating the difference between the reference image and the evaluation image is superimposed, and the reference image and the evaluation image enlarged including the difference. To do. This makes it easy for the user to know which part of the reference image or evaluation image is an enlarged image, and also makes it easy to search for differences between the reference image and the evaluation image.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

  For example, the position and range of the enlarged display range 103 may be changed by a user's mouse operation (dragging, clicking, etc.), “Shift key” pressing operation, and “Up / Down / Left / Right Arrow Key” pressing operation. Further, for example, the user may select an enlarged display rate by operating a mouse from a pull-down menu. Further, for example, when the evaluation image is a moving image, the difference may be searched across the previous and next image frames. Further, for example, the display color of the difference may be changed depending on the number of pixels.

DESCRIPTION OF SYMBOLS 10 ... Image display apparatus 11 ... Input part 12 ... Difference point detection part 13 ... Range designation | designated part 14 ... Comparison image generation part 15 ... Image superimposition part 16 ... Image expansion part 17 ... Display part 20 ... Reference image 30 ... Evaluation image 31 ... Error location 32 ... Error location 40 ... Differential image 41 ... Difference point 42 ... Difference point 100 ... Comparison image 101 ... Difference point image 102 ... Difference point image 103 ... Rectangle image 104 ... Next button 105 ... Previous button 106 ... An image showing a range including a difference point 107... An image showing a range including a difference point 200.

Claims (4)

A difference detection unit for detecting a difference between the first image and the second image;
A comparison image generation unit that generates a comparison image by superimposing an image indicating the difference on the first image;
A range designating unit for designating a display range of the first image and the second image;
An image superimposing unit that superimposes an image indicating the designated range on the comparison image;
An image enlarging unit for enlarging each of the ranges of the first image and the second image;
A display unit for displaying the superimposed comparison image and the enlarged image;
An image display device comprising:   The range specifying unit specifies a first range including a part of the difference, and then specifies a second range including a part of the difference outside the first range. Item 4. The image display device according to Item 1.   The image display device according to claim 1, wherein the comparison image generation unit superimposes an image indicating a range including the difference point on the comparison image.   4. The image display device according to claim 1, wherein the comparison image generation unit sets an image indicating the difference point to an image having a color different from that of the periphery of the difference point. 5. .

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