JP5316199B2 - Display control apparatus, display control method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve appropriate image display without providing a dedicated circuit configuration for a display device having low display resolution relative to resolution of image data. <P>SOLUTION: An imaging device 100 includes: a first selection circuit 72 for sequentially thinning and selecting data of pixels at different locations of image data according to a predetermined rule to sequentially output selected image data to a display means; an interpolation circuit 73 for combining the data of the pixels at the different locations of the image data with one another to output the combined image data to the display means; and a second selection circuit 76 for executing selective control of output of the selected image data generated by the first selection circuit 72, or output of the combined image data generated by the interpolation circuit 73 when the display resolution of the display means is lower than the resolution of the image data. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

The present invention relates to a display control device, a display control method, and a program.

  Conventionally, as output destinations of image data stored in a device such as a digital camera, there are an LCD provided in the device, TV, HDMI as an external output, and the like. Further, in such a device, when outputting the image data to a display device having a display resolution lower than the resolution of the image data, a technique for performing interlaced display is known (for example, see Patent Document 1). Also, an image processing method is known that can display an image with a wide viewing angle and excellent color reproducibility even when an interlace video signal is input (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 05-289044 Japanese Patent Publication No. 2004-302023

  By the way, although an inexpensive liquid crystal panel can be used as a display device having a display resolution lower than the resolution of image data, the cost of the display device can be reduced, but the control circuit must be customized according to the output destination. That is, when outputting image data to display devices having different display resolutions, there is a problem in that a dedicated control circuit corresponding to each output destination must be individually provided in accordance with the display resolution of each display device.

An object of the present invention is to provide a display control device, a display control method, and a program capable of realizing appropriate image display for a display device having a display resolution lower than the resolution of image data.

In order to solve the above problems, the present invention provides an acquisition means for acquiring image data, and sequentially selects and selects pixel data at different positions in the image data according to a predetermined rule, and sequentially outputs the selected image data to the display means. A first output unit that combines the data of pixels at different positions in the image data and outputs the combined image data to the display unit, and the display unit displays the resolution based on the resolution of the image data. Control means for performing selection control of output of the selected image data by the first output means or output of the composite image data by the second output means when the resolution is lower, and the image data Detecting means for detecting a difference between two adjacent line data among line data of lines composed of a plurality of pixels along a predetermined direction of an image based on The control means selects the output of the composite image data by the second output means when the difference detected by the detection means is greater than or equal to a predetermined value, while the difference detected by the detection means When the value is less than the predetermined value, the output of the selected image data by the first output means is selected, and the display control apparatus, the display control method, and the program are provided.
According to another aspect of the present invention, there is provided an acquisition means for acquiring image data, and a method of sequentially outputting selected image data to a display means by sequentially thinning out and selecting pixel data at different positions of the image data according to a predetermined rule. A first output means, a second output means for synthesizing pixel data at different positions of the image data and outputting the combined image data to the display means, and a display resolution of the display means based on the resolution of the image data. Control means for performing selection control of output of the selected image data by the first output means or output of the composite image data by the second output means when the output is lower. When the display frame rate of the display means is equal to or higher than a predetermined speed, the means selects the output of the selected image data by the first output means while the display means If shows the frame rate is less than the predetermined speed, and a display control device, display control method and a program and selects an output of the synthesized image data by the second output means.

  ADVANTAGE OF THE INVENTION According to this invention, an appropriate image display is realizable with respect to the display apparatus of display resolution lower than the resolution of image data.

It is a block diagram which shows schematic structure of the imaging device to which this invention is applied. It is a block diagram which shows schematic structure of a display control part. 3 is a flowchart illustrating an example of an operation related to an image display process by the imaging apparatus of FIG. 1. FIG. 4 is a flowchart showing a continuation of the image display process of FIG. 3. FIG. It is a figure which shows typically an example of the image for demonstrating the synthetic | combination process of the image based on image data, and the superimposition image based on superimposition image data.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.
FIG. 1 is a block diagram illustrating a schematic configuration of an imaging apparatus 100 according to an embodiment to which the present invention is applied, and FIG. 2 is a block diagram mainly illustrating a configuration of a display control unit 7 in detail.

When the display resolution of the display unit 8 is lower than the resolution of the image data acquired from the memory 5, the imaging apparatus 100 according to the present embodiment sequentially thins out the pixel data at the pixel position of the image data according to a predetermined rule. The display control unit 7 selects whether to select and output the selected image data to the display unit 8 or to combine the pixel data at different pixel positions of the image data and output the combined image data to the display unit 8 To do.
Specifically, as illustrated in FIG. 1, the imaging apparatus 100 includes a lens unit 1, an electronic imaging unit 2, an imaging control unit 3, an image data generation unit 4, a memory 5, and a memory transfer control circuit 6. A display control unit 7, a display unit 8, an external output unit 9, an operation input unit 10, a recording medium 11, and a CPU 12.

The lens unit 1 includes a plurality of lenses and includes a zoom lens, a focus lens, and the like.
Although not shown, the lens unit 1 includes a zoom drive unit that moves the zoom lens in the optical axis direction and a focus drive unit that moves the focus lens in the optical axis direction when imaging a subject. May be.

  The electronic imaging unit 2 is composed of an image sensor such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal-oxide Semiconductor), for example, and converts an optical image that has passed through various lenses of the lens unit 1 into a two-dimensional image signal. To do.

  Although not shown, the imaging control unit 3 includes a timing generator, a driver, and the like. Then, the imaging control unit 3 scans and drives the electronic imaging unit 2 with a timing generator and a driver, converts the optical image into a two-dimensional image signal with the electronic imaging unit 2 every predetermined period, and the electronic imaging unit 2 Image frames are read out from the imaging area for each screen and output to the image data generation unit 4.

The image data generation unit 4 appropriately adjusts the gain for each RGB color component with respect to the analog value signal of the image frame transferred from the electronic imaging unit 2, and then performs sample holding by a sample hold circuit (not shown). The digital signal is converted into digital data by a / D converter (not shown), color processing including pixel interpolation processing and γ correction processing is performed by a color process circuit (not shown), and then a digital luminance signal Y and color difference signal Cb , Cr (YUV data).
The luminance signal Y and the color difference signals Cb and Cr output from the color process circuit are DMA transferred to a memory 5 used as a buffer memory via a DMA controller (not shown).

  The memory 5 is composed of, for example, a DRAM and temporarily stores data processed by the CPU 12 or the like. Specifically, as shown in FIG. 2, the memory 5 includes an image data memory 51 and a superimposed image data memory 52.

  The image data memory 51 temporarily stores the image data transferred from the image data generation unit 4. The image data temporarily stored in the image data memory 51 can be temporarily stored at a resolution corresponding to an external display device having a resolution higher than the display resolution of the display unit 8.

  The superimposed image data memory 52 temporarily stores superimposed image data processed by the CPU 12 and the display control unit 7. Here, the superimposed image refers to an image such as a character or a figure that is displayed superimposed on the image when the image based on the image data is displayed on the display unit 8 or the like. In addition, the superimposed image data memory 52 stores the superimposed image data in association with the designated position data when the superimposed image based on the superimposed image data is superimposed on the image based on the image data.

The memory transfer control circuit 6 performs control to transfer image data or superimposed image data temporarily stored in the memory 5 to the display control unit 7.
Specifically, as shown in FIG. 2, the memory transfer control circuit 6 includes an odd line selection transfer unit 61, an even line selection transfer unit 62, and an all line selection transfer unit 63.

The odd line selection transfer unit 61 performs control to transfer the odd line pixel data among the odd line pixel data and the even line pixel data obtained by scanning the image data temporarily stored in the memory 5 to the display control unit 7. Do.
Specifically, the odd line selection transfer unit 61 transfers the odd line pixel data to the display control unit 7 at the image display timing based on the odd line pixel data, and displays the image based on the even line pixel data. At the timing, the pixel data of the next odd line is transferred to the display control unit 7.

The even line selection / transfer unit 62 performs control to transfer the pixel data of the even line among the pixel data of the odd line and the pixel data of the even line obtained by scanning the image data temporarily stored in the memory 5 to the display control unit 7. Do.
Specifically, the even line selection / transfer unit 62 transfers the pixel data of the even line next to the odd line to the display control unit 7 at the display timing of the image based on the pixel data of the odd line. The pixel data of the next even line is transferred to the display control unit 7 at the image display timing based on the data.

The all-line selection / transfer unit 63 performs control to transfer pixel data of each line obtained by scanning the superimposed image data temporarily stored in the memory 5 to the display control unit 7.
Specifically, the all line selection transfer unit 63 displays pixel data of each line obtained by scanning the superimposed image data temporarily stored in the memory 5 at an image display timing based on the pixel data of each line. Transfer to the control unit 7.

  The display control unit (display control device) 7 transmits image data acquired by being transferred from the memory transfer control circuit 6 to an external display device connected to the display unit 8 or the external output unit 9 as display means. Control the display.

  Specifically, the display control unit 7, as shown in FIG. 2, includes an odd line pixel buffer 70, an even line pixel buffer 71, a first selection circuit 72, an interpolation circuit 73, and a difference detection circuit 74. A frame rate switching circuit 75, a second selection circuit 76, a pixel buffer 77, a color palette conversion circuit 78, and a synthesis circuit 79.

The odd line pixel buffer 70 temporarily stores the pixel data of the odd lines transferred from the odd line selection transfer unit 61. That is, the display control unit 7 temporarily stores the pixel data of the odd lines transferred from the odd line selection transfer unit 61 in the odd line pixel buffer 70, thereby obtaining the pixel data (image data). . The odd-numbered line pixel data may be directly transferred from the image data memory 51 to the odd-numbered line pixel buffer 70 without going through the odd-numbered line selective transfer unit 61.
Here, the display control unit 7 constitutes an acquisition unit that acquires image data.

The even line pixel buffer 71 temporarily stores the even line pixel data transferred from the even line selection transfer unit 62. In other words, the display control unit 7 temporarily stores the even line pixel data transferred from the even line selection transfer unit 62 in the even line pixel buffer 71, thereby obtaining the pixel data (image data). . Alternatively, the even line pixel data may be directly transferred from the image data memory 51 to the even line pixel buffer 71 without going through the even line selection / transfer section 61.
Here, the display control unit 7 constitutes an acquisition unit that acquires image data.

The first selection circuit 72 alternately outputs pixel data of odd lines and pixel data of even lines obtained by scanning image data, and outputs selected image data.
Specifically, the first selection circuit 72 acquires and outputs the odd-line pixel data temporarily stored in the odd-line pixel buffer 70 at the image display timing based on the odd-line pixel data, and outputs the even-number pixel data. The even line pixel data temporarily stored in the even line pixel buffer 71 is acquired and output at the image display timing based on the line pixel data.
Here, the first selection circuit 72 constitutes first output means for sequentially thinning out and selecting data at different positions in the image data according to a predetermined rule and sequentially outputting the selected image data to the display means.

The interpolation circuit 73 outputs pixel data (combined line data) of a combined line obtained by combining pixel data of odd lines and pixel data of even lines in each frame of image data.
Specifically, the interpolation circuit 73 obtains the odd-line pixel data temporarily stored in the odd-line pixel buffer 70 and the even-line pixel data temporarily stored in the even-line pixel buffer 71, respectively. Thus, the synthesized image data corresponding to the resolution of the display unit 8 is generated and output.
Here, the interpolation circuit 73 constitutes a second output unit that combines pixel data at different positions in the image data and outputs the combined image data to the display unit 8.

The difference detection circuit (detection means) 74 detects a difference between two adjacent line data among line data of lines composed of a plurality of pixels along a predetermined direction of the image based on the image data.
Specifically, the difference detection circuit 74 uses the odd line pixel data temporarily stored in the odd line pixel buffer 70 and the even line pixel data temporarily stored in the even line pixel buffer 71, respectively. Obtain and detect the differences sequentially. Then, the difference detection circuit 74 accumulates the detected differences and outputs an average value of the differences within a certain period.

  For example, when a desired operation mode (for example, fast-forward playback or frame-by-frame playback) is instructed based on a predetermined operation of the operation input unit 10 by the user, the frame rate switching circuit 75 is switched according to the operation mode. A predetermined signal indicating the displayed display frame rate is output to the second selection circuit 76.

The second selection circuit 76 selects one of the selected image data output from the first selection circuit 72 and input and the combined image data output from the interpolation circuit 73 and input.
Specifically, the second selection circuit 76 outputs from the difference detection circuit 74 when the display resolution of the second display device (for example, the display unit 8) that is the output destination is lower than the resolution of the image data. If the average value of the differences is equal to or greater than a predetermined value, the combined image data output from the interpolation circuit 73 and input is selected and output to the combining circuit 79.
On the other hand, when the average value of the differences output from the difference detection circuit 74 is less than a predetermined value, the second selection circuit 76 generates a second signal based on the predetermined signal output from the frame rate switching circuit 75 and input. It is determined whether or not the display frame rate of the display device is equal to or higher than a predetermined speed. If the display frame rate of the second display device is equal to or higher than the predetermined speed, the second selection circuit 76 selects the selected image data output from the first selection circuit 72, while displaying the display frame. If the rate is less than the predetermined speed, the combined image data output from the interpolation circuit 73 and input is selected and output to the combining circuit 79.

  As described above, the second selection circuit 76 determines whether the first selection circuit 72 outputs the selected image data when the display resolution of the output destination display device (second display device) is lower than the resolution of the image data. Alternatively, a control means for performing selection control of the output of the composite image data by the interpolation circuit 73 is configured. The second selection circuit 76 selects the selected image data by the first selection circuit 72 based on at least one of the type of display image (for example, the type of image data) and the operation mode (for example, display frame rate). And the output of the composite image data by the interpolation circuit 73 are switched and selected.

  In addition, when the display resolution of the first display device (for example, TV) that is the output destination is equal to or higher than the resolution of the image data, the second selection circuit 76 selects the selection that is output from the first selection circuit 72 and input. Image data is selected and output to the synthesis circuit 79.

The pixel buffer 77 temporarily stores pixel data of each line of the superimposed image data transferred from the all line selection transfer unit 63. In other words, the display control unit 7 temporarily stores the pixel data of each line transferred from the all-line selection transfer unit 63 in the pixel buffer 77, thereby obtaining the pixel data (superimposed image data). Note that the superimposed image data may be directly transferred from the superimposed image data memory 52 to the pixel buffer 77 without going through the all-line selection transfer unit 63.
Here, the display control unit 7 constitutes a superimposed image acquisition unit that acquires superimposed image data of a superimposed image to be superimposed on an image based on the image data.

  The color palette conversion circuit 78 converts a pixel of a portion displaying a character or a figure to be superimposed on an image from pixel data of each line of the superimposed image data input from the pixel buffer 77 to a predetermined color, and the like. These pixels are converted to a transparent color and output.

The combining circuit 79 combines the image based on the image data and the superimposed image based on the superimposed image data.
Specifically, a superimposed image obtained by synthesizing a superimposed image based on the superimposed image data and an image based on the image data is a first display device (first display means; for example, having the same display resolution as the resolution of the image data; In the case of display on a TV or the like, the combining circuit 79 combines the odd line pixel data and the even line pixel data related to the selected image data output from the second selection circuit 76 and input. The combining circuit 79 combines the combined image and the superimposed image based on the superimposed image data output from the color palette conversion circuit 78 and input.
On the other hand, when the superimposed composite image is displayed on a second display device (second display means; for example, the display unit 8) having a display resolution lower than the resolution of the image data, the composition circuit 79 includes a color palette conversion circuit. The superimposed image based on the superimposed image data output from and input from 78 and the image based on the selected image data or the combined image data output from the second selection circuit 76 are combined.

More specifically, as shown in FIG. 5, for example, when the first display device (for example, TV) is designated as the output destination, the resolution of the image data is 480 × 640 pixels in the vertical and horizontal directions. Since the display resolution of the first display device is 480 × 640 pixels in the vertical and horizontal directions, the display resolution of the first display device is the same value as the resolution of the image data. In this case, the synthesis circuit 79 first synthesizes the odd line pixel data and the even line pixel data related to the selected image data output from the second selection circuit 76 and input. The combining circuit 79 combines the combined image and the superimposed image based on the superimposed image data output from the color palette conversion circuit 78 and input.
On the other hand, when the second display device (for example, the display unit 8) is designated as the output destination, the resolution of the image data is 480 × 640 pixels in the vertical × horizontal direction, whereas the resolution of the display unit 8 The display resolution is 240 × 640 pixels (vertical × horizontal) (an integer resolution of the display resolution of the first display device (vertical display resolution is ½)). The vertical display resolution is lower than that of image data. In this case, the composition circuit 79 superimposes the image based on the selected image data or the composite image data output and input from the second selection circuit 76 and the superimposition image data output from the color palette conversion circuit 78 and input. Composite with the image.
At this time, the superimposed image is synthesized at a predetermined designated position based on the designated position data stored together with the superimposed image data, and the portion converted into a transparent color by the color palette conversion circuit 78 at the time of synthesis is converted into image data. A transparent image is displayed. Thereby, since the superimposed image is output without thinning out the superimposed image data, the deformation of the superimposed image can be prevented, and the characters and figures superimposed on the image can be displayed in an easy-to-see manner.

As described above, the composition circuit 79 constitutes a superimposed image composition unit that composes an image based on image data and a superimposed image based on superimposed image data. Specifically, the combining circuit 79, when displaying the superimposed composite image obtained by combining the superimposed image and the image based on the image data on the first display device, the superimposed image data output from the color palette conversion circuit 78, When combining the image data output from the combining circuit 79 (third output means) and displaying the superimposed combined image on the second display device, the superimposed image data output from the color palette conversion circuit 78 and The selected image data output from the first selection circuit 72 or the synthesized image data output from the interpolation circuit 73 is synthesized.
The combining circuit 79 constitutes a third output unit that outputs the image data as it is to a first display device having a display resolution that is the same value as the resolution of the image data.
The color palette conversion circuit 78 and the composition circuit 79 constitute superimposed image output means for outputting the superimposed image data as it is to the first and second display devices that are output destinations.

  The display unit 8 is, for example, a liquid crystal display device, and displays an image captured by the electronic imaging unit 2 on the display screen based on a video signal from the display control unit 7. Specifically, the display unit 8 displays a live view image based on a plurality of image frames generated by imaging the subject by the lens unit 1, the electronic imaging unit 2, and the imaging control unit 3 in the imaging mode. The REC view image captured as the actual captured image is displayed.

  Although not shown, the external output unit 9 includes a video encoder, a digital-analog conversion circuit, an external output terminal, and the like. And the external output part 9 outputs the video signal output from the display control part 7 to external display apparatuses, such as TV, via the communication cable connected to the external output terminal.

  The operation input unit 10 is for performing a predetermined operation of the imaging apparatus 100. Specifically, although not shown, the operation input unit 10 includes a shutter button related to an instruction to shoot a subject, a selection determination button related to an instruction to select an imaging mode and a function, a zoom button related to an instruction to adjust the zoom amount, and the like. And a predetermined operation signal is output to the CPU 12 in accordance with the operation of these buttons.

  The recording medium 11 is composed of, for example, a non-volatile memory (flash memory) or the like, and stores image data generated by the image data generation unit 4, superimposed image data of a superimposed image to be superimposed on an image, and the like.

  The CPU 12 controls each unit of the imaging device 100. Specifically, the CPU 12 performs various control operations in accordance with various processing programs (not shown) for the imaging apparatus 100.

Next, image display processing by the imaging apparatus 100 will be described with reference to FIGS.
3 and 4 are flowcharts illustrating an example of an operation related to the image display process.

  As shown in FIG. 3, first, the CPU 12 designates a display device for displaying an image (step S1). Specifically, based on a predetermined selection instruction operation of the operation input unit 10 by the user, the CPU 12 displays an image on the display unit 8 or displays an image on an external display device connected to the external output unit 9. Specify whether to display.

  Next, the CPU 12 performs a process (step S2) of acquiring image data of an image to be displayed on the designated display device. Specifically, when a desired image is specified based on a predetermined operation of the operation input unit 10 by the user, the CPU 12 determines the image specified from the recording medium 11 or the like based on a predetermined signal related to the specification. The image data is transferred to the memory 5 and temporarily stored in the image data memory 51.

  Then, the CPU 12 scans the image data temporarily stored in the image data memory 51 in the odd line selection transfer unit 61 and the even line selection transfer unit 62 of the memory transfer control circuit 6 for each frame. Data and even-numbered pixel data are selected alternately. Then, the CPU 12 causes the odd line selection transfer unit 61 to transfer the odd line pixel data to the odd line pixel buffer 70 of the display control unit 7. Further, the CPU 12 causes the even line selection / transfer unit 62 to transfer the pixel data of the even line to the even line pixel buffer 71 of the display control unit 7. Then, the CPU 12 alternately selects and selects the odd line pixel data temporarily stored in the odd line pixel buffer 70 and the even line pixel data temporarily stored in the even line pixel buffer 71. The image data is generated by the first selection circuit 72 (step S3).

  Next, the CPU 12 interpolates the synthesized image data obtained by synthesizing the odd-line pixel data output from the odd-line pixel buffer 70 and the even-line pixel data output from the even-line pixel buffer 71. (Step S4).

Then, the CPU 12 determines whether or not the display resolution of the display device (for example, the display unit 8) designated as the display destination is lower than the resolution of the image data transferred to the memory 5 (step S5). .
Here, if it is determined that the display resolution of the display device designated as the display destination is lower than the resolution of the image data (step S5; YES), for example, the display destination is the display unit 8 (second display). CPU 12 determines whether the difference between the pixel data of two lines (odd line and even line) adjacent in the vertical direction is greater than or equal to a predetermined value (step S6). The selection circuit 76 performs this. Specifically, the difference detection circuit 74 uses the odd line pixel data temporarily stored in the odd line pixel buffer 70 and the even line pixel data temporarily stored in the even line pixel buffer 71, respectively. Obtain and detect the differences sequentially. Then, the difference detection circuit 74 accumulates the detected differences and outputs an average value of the differences within a certain period to the second selection circuit 76. The second selection circuit 76 determines whether the average value of the differences output from the difference detection circuit 74 is greater than or equal to a predetermined value.

  If it is determined in step S6 that the difference between the pixel data of two adjacent lines is not greater than or equal to a predetermined value (step S6; NO), the CPU 12 determines whether or not the image display frame rate is greater than or equal to a predetermined speed. (Step S7) is performed by the second selection circuit 76. Specifically, the second selection circuit 76 determines whether or not the display frame rate is equal to or higher than a predetermined speed based on a predetermined signal indicating the display frame rate output from the frame rate switching circuit 75 and input. I do.

  When it is determined in step S7 that the display frame rate is equal to or higher than the predetermined speed (step S7; YES), the CPU 12 causes the second selection circuit 76 to perform the first output process (step S8). . Specifically, the CPU 12 causes the second selection circuit 76 to output the selected image data generated by the first selection circuit 72 as the first output process.

  If it is determined in step S6 that the difference between the pixel data of two adjacent lines is greater than or equal to a predetermined value (step S6; YES), the CPU 12 selects the second output process (step S9) as the second selection. Let the circuit 76 do this. Specifically, the CPU 12 causes the second selection circuit 76 to output the composite image data generated by the interpolation circuit 73.

  If it is determined in step S7 that the display frame rate is not equal to or higher than the predetermined speed (step S7; NO), the CPU 12 shifts the process to step S9 and performs the second output process on the second selection circuit. 76.

  If it is determined in step S5 that the resolution of the display device designated as the display destination is not lower than the resolution of the image data (step S5; NO), for example, the display destination is the first display. In the case of a device (such as a TV), the CPU 12 causes the second selection circuit 76 to output the selected image data generated by the first selection circuit 72 as the third output process. Then, the CPU 12 causes the combining circuit 79 to combine the odd line pixel data and the even line pixel data as the selected image data output from the second selection circuit 76 (step S10).

Next, as shown in FIG. 4, the CPU 12 determines whether or not there is an instruction to display a desired superimposed image based on a predetermined selection instruction operation of the operation input unit 10 by the user (step S <b> 11).
If it is determined that there is an instruction to display a superimposed image (step S11; YES), the CPU 12 superimposes the superimposed image designated from the recording medium 11 or the like based on a predetermined signal related to the display instruction. The data is transferred to the memory 5 and temporarily stored in the superimposed image data memory 52. Then, the CPU 12 transfers the pixel data of each line of predetermined superimposed image data temporarily stored in the superimposed image data memory 52 to the all-line selection transfer unit 63 of the memory transfer control circuit 6. 77. Thereby, the display control part 7 acquires superimposition image data (step S12).

  Then, as the superimposed image output process, the CPU 12 causes the color palette conversion circuit 78 of the display control unit 7 to sequentially output pixel data of each line of the superimposed image data temporarily stored in the pixel buffer 77 (step S13).

Next, the CPU 12 causes the display control unit 7 to display an image based on the image data output from the second selection circuit 76 and input, and a superimposed image based on the superimposed image data output from the color palette conversion circuit 78. The synthesis is performed by the synthesis circuit 79 (step S14). Specifically, as illustrated in FIG. 5, for example, when the display destination is a first display device (for example, a TV), the resolution of the image data is 480 × 640 pixels in length × width, Since the display resolution of the first display device is 480 × 640 pixels in the vertical and horizontal directions, the display resolution of the first display device is the same value as the resolution of the image data. In this case, the CPU 12 first causes the combining circuit 79 to combine the odd line pixel data and the even line pixel data related to the selected image data output from the second selection circuit 76 and input. Then, the CPU 12 causes the synthesis circuit 79 to synthesize the synthesized image and the superimposed image based on the superimposed image data output from the color palette conversion circuit 78 and input.
On the other hand, when the display destination is the display unit 8 (second display device), the resolution of the image data is 480 × 640 pixels in the vertical and horizontal directions, whereas the display resolution of the display unit 8 is the vertical × Since the horizontal is 240 × 640 pixels, the vertical display resolution of the display unit 8 is lower than that of the image data. In this case, the CPU 12 outputs to the synthesis circuit 79 an image based on the selected image data or the synthesized image data output from the second selection circuit 76 and the superimposed image data output from the color palette conversion circuit 78 and input. And a superimposed image based on the above.

Then, the CPU 12 displays the synthesized image on the display device designated as the output destination (step S15), and ends the image display process.
If it is determined in step S11 that there is no instruction to display a superimposed image (step S11; NO), the CPU 12 displays an image based on the image data on the display device designated as the output destination (step S15). ), The image display process is terminated.
The selection method of the image data output by the second selection circuit 76 is automatically selected by output signals from the difference detection circuit 74 and the frame rate switching circuit 75, and is manually selected by a predetermined operation of the operation input unit 10 by the user. You may do it.
Further, automatic selection of the image data output method by the second selection circuit 76 is not limited to the type of image data (output signal of the difference detection circuit 74) and the display frame rate (output signal of the frame rate switching circuit 75). May be performed based on the characteristics of the display device by detecting the characteristics (for example, the difference in the length of afterimages such as CRT and LCD).

As described above, according to the imaging device 100 of the present embodiment, the resolution of the display device (for example, the display unit 8) designated as the display destination is lower than the image data of the desired image designated by the user. In this case, the second selection circuit 76 selects and acquires the odd-line pixel data temporarily stored in the odd-line pixel buffer 70 at the image display timing based on the odd-line pixel data, and obtains the even-line pixels. Output selected image data generated by selecting and obtaining pixel data of even lines temporarily stored in the even line pixel buffer 71 at an image display timing based on the data, or for odd lines The odd line pixel data temporarily stored in the pixel buffer 70 and the even line pixel data temporarily stored in the even line pixel buffer 71. It is possible to select whether the pixel data and outputs the synthesized image data generated by combining.
Therefore, when outputting image data to a display device having a display resolution lower than the resolution of the image data, the second selection circuit 76 can select the output method of the image data. For example, the display destination display device characteristics, Even when the display frame rate, the type of image data, or the user's preference is different, an image can be displayed in an appropriate state.
In addition, since whether or not to change the resolution by alternately selecting or synthesizing the pixel data of the odd lines and the pixel data of the even lines can be switched according to the display resolution of the display device of the output destination, It is not necessary to provide a dedicated circuit configuration corresponding to each display device, and the circuit scale can be reduced.

In addition, if the average value of the differences output from the difference detection circuit 74 is equal to or greater than a predetermined value, the second selection circuit 76 temporarily stores the odd-line pixel data and the even-line data in the odd-line pixel buffer 70. The combined image data generated by causing the interpolation circuit 73 to combine the pixel data of the even lines temporarily stored in the pixel buffer 71 can be output. In other words, if the difference output from the difference detection circuit 74 is greater than or equal to a predetermined value, flickering that occurs when the line data is greatly different can be suitably prevented by outputting the composite image data generated between the line data. can do.
Further, the second selection circuit 76 is configured so that the average value of the differences output from the difference detection circuit 74 is less than a predetermined value and the display frame rate of the image based on the image data is equal to or higher than a predetermined speed, the first selection circuit 76 72, the odd line pixel data temporarily stored in the odd line pixel buffer 70 is selected at the image display timing based on the odd line pixel data, and the image display timing based on the even line pixel data is selected. The selected image data acquired by selecting the pixel data of the even line temporarily stored in the even line pixel buffer 71 can be output. That is, if the difference output from the difference detection circuit 74 is less than the predetermined value and the display frame rate is equal to or higher than the predetermined speed, the pixel data of the odd lines and the pixel data of the even lines are selected and output. , Can improve the apparent resolution visually.
Accordingly, when outputting image data to a display device (second display device) having a display resolution lower than the resolution of the image data, the second selection circuit 76 displays the type of image data, the display frame rate, or the display destination. Since the image data output method is automatically selected according to the characteristics of the apparatus, the image can be displayed easily and surely in an appropriate state. Further, it is not necessary to provide a dedicated circuit configuration for performing such control.

In addition, if the display frame rate of the image based on the image data is less than a predetermined speed, the second selection circuit 76 temporarily stores the odd line pixel data and the even line pixel buffer stored in the odd line pixel buffer 70. The synthesized image data generated by causing the interpolation circuit 73 to synthesize even-numbered pixel data temporarily stored in 71 can be output. In other words, if the display frame rate of the image based on the image data is less than a predetermined speed, flickering that is visible when the display frame rate is slowed by outputting the composite image data generated between the line data. Can be suitably prevented.
Accordingly, when outputting image data to a display device (second display device) having a display resolution lower than the resolution of the image data, the second selection circuit 76 displays the type of image data, the display frame rate, or the display destination. Since the image data output method is automatically selected according to the characteristics of the apparatus, the image can be displayed easily and surely in an appropriate state. Further, it is not necessary to provide a dedicated circuit configuration for performing such control.

  The display control unit 7 sequentially outputs pixel data of each line obtained by scanning the superimposed image data for the superimposed image data temporarily stored in the memory 5, that is, thins out the pixel data of each line. Therefore, the superimposed image can be prevented from being deformed, and the characters and figures superimposed on the image based on the image data can be easily displayed.

Even if the resolution of the display device (second display device) set as the display destination is lower than the image data of the desired image designated by the user, the resolution of the image data and the display device Even when the display resolution of the (first display device) is the same value, both the image data and the superimposed image data are temporarily stored in the image data memory 51 of the memory 5 or the superimposed image data memory 52. In addition, the synthesis circuit 79 of the display control unit 7 can perform synthesis control of the image based on the image data and the superimposed image based on the superimposed image data.
Therefore, it is not necessary to provide a memory (storage means) and a display control unit corresponding to the display device as the display destination.

The present invention is not limited to the above-described embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.
For example, in the above embodiment, in the image display process, it is determined whether or not the difference between adjacent line data is greater than or equal to a predetermined value (step S6), and whether or not the display frame rate is greater than or equal to a predetermined speed. Although the determination (step S7) is performed, the present invention is not limited to this, and any one of these two determination processes may be performed.
In the above embodiment, the first output process is performed under the AND condition of these two determination processes (NO in step S6 and YES in step S7), but the OR condition of these two determination processes You may make it perform a 1st output process by (NO in step S6 or YES in step S7).
That is, in the above-described embodiment, the second selection circuit 76 has the average value of the differences output from the difference detection circuit 74 less than a predetermined value, and the display frame rate of the output destination display device is a predetermined speed. In the above case, the selection image data is output by the first selection circuit 72. If the average value of the differences output from the difference detection circuit 74 is less than a predetermined value, the first selection circuit 72 On the other hand, if the average value of the differences output from the difference detection circuit 74 is greater than or equal to a predetermined value, the output processing of the composite image data by the interpolation circuit 73 may be performed.
In addition, the second selection circuit 76 outputs from the first selection circuit 72 if the display frame rate of the output display device is equal to or higher than a predetermined speed regardless of the average value of the differences output from the difference detection circuit 74. The selected selection image data inputted is selected. On the other hand, if the display frame rate is less than a predetermined speed, the synthesized image data outputted from the interpolation circuit 73 and inputted is outputted to the synthesis circuit 79. Anyway.

  In the above embodiment, the determination of whether the display resolution of the display device designated as the display destination is lower than the resolution of the image data transferred to the memory 5 (step S5). If it is not determined that the display resolution of the display device designated as the display destination is lower than the resolution (step S5; NO), the CPU 12 performs the third output process (step S10). Instead, whether or not to perform the third output process may be arbitrary.

In the above embodiment, if it is determined whether there is an instruction to display a superimposed image (step S11; YES) when it is determined whether there is an instruction to display a predetermined superimposed image (step S11). The image based on the data and the superimposed image based on the superimposed image data are combined. However, the present invention is not limited to this, and whether to combine the image based on the image data and the superimposed image based on the superimposed image data is arbitrary. May be.
Further, in the above embodiment, the resolution is changed by half by selecting or combining odd lines and even lines. However, by selecting or combining three lines, the resolution is reduced to 3 minutes. The resolution may be changed to 1, or an arbitrary resolution may be changed by selecting or combining any other number of lines.

In addition, the configuration of the imaging apparatus 100 is merely an example illustrated in the above embodiment, and is not limited thereto. That is, the display control unit 7 included in the imaging device 100 is illustrated as the display control device. However, the display control unit 7 is not limited to this. A first output unit that sequentially selects and outputs the selected image data to the display unit in accordance with a rule; and a second unit that combines the pixel data at different positions of the image data and outputs the combined image data to the display unit. When the display resolution of the output means and the display means is lower than the resolution of the image data, the selection control of the output of the selected image data by the first output means or the output of the composite image data by the second output means Any configuration may be used as long as it includes at least control means for performing the above.
In addition, instead of the first output unit, the second output unit, and the control unit, the display control unit 7 changes the pixel at a different position in the image data when the display resolution of the display unit is lower than the resolution of the image data. The first output control for sequentially thinning out and selecting the data according to a predetermined rule and selecting and sequentially outputting the selected image data to the display means, or the synthesized image data is displayed by synthesizing the pixel data at different positions of the image data You may make it provide the display control means which performs selection control of the 2nd output control output to a means.
Furthermore, the display device is configured to include the display unit (display unit) 8 that displays an image based on the image data in the imaging device 100. However, the display device is not limited thereto, and the display device includes an acquisition unit and a display unit. Any configuration may be used as long as it includes at least the display unit and the display control unit.

Furthermore, in the above-described embodiment, the functions as the acquisition unit, the first output unit, the second output unit, and the control unit are realized by the display control unit 7 driving under the control of the CPU 12. However, the present invention is not limited to this, and a configuration realized by executing a predetermined program or the like by the CPU 12 may be used.
That is, a program memory (not shown) that stores a program stores a program including an acquisition processing routine, a first output processing routine, a second output processing routine, and a control processing routine. Then, the CPU 12 may be caused to function as an acquisition unit that acquires image data by an acquisition process routine. The first output processing routine causes the CPU 12 to function as a first output unit that sequentially selects and selects pixel data at different positions in the image data according to a predetermined rule and sequentially outputs the selected image data to the display unit. You may do it. Further, the CPU 12 may be caused to function as a second output unit that combines pixel data at different positions in the image data and outputs the combined image data to the display unit by the second output processing routine. Further, the CPU 12 causes the control processing routine to output the selected image data by the first output processing routine or the synthesis by the second output processing routine when the display resolution of the display means is lower than the resolution of the image data. You may make it function as a control means which performs selection control of the output of image data.

DESCRIPTION OF SYMBOLS 100 Imaging device 5 Memory 51 Image data memory 52 Superimposed image data memory 6 Memory transfer control circuit 61 Odd line selection transfer part 62 Even line selection transfer part 63 All line selection transfer part 7 Display control part 70 Odd line pixel buffer 71 Even line pixel buffer 72 First selection circuit 73 Interpolation circuit 74 Difference detection circuit 76 Second selection circuit 77 Pixel buffer 78 Color palette conversion circuit 79 Composition circuit 8 Display unit 9 External output unit 12 CPU

Claims (13)

Acquisition means for acquiring image data;
First output means for sequentially thinning out and selecting pixel data at different positions of the image data according to a predetermined rule and sequentially outputting the selected image data to the display means;
Second output means for combining pixel data at different positions of the image data and outputting the combined image data to the display means;
When the display resolution of the display means is lower than the resolution of the image data, the output of the selected image data by the first output means or the output of the composite image data by the second output means Control means for performing selection control;
Detecting means for detecting a difference between two adjacent line data among line data of lines composed of a plurality of pixels along a predetermined direction of the image based on the image data;
With
The control means selects the output of the composite image data by the second output means when the difference detected by the detection means is equal to or greater than a predetermined value, while the difference detected by the detection means A display control apparatus , wherein if the value is less than a predetermined value, the output of the selected image data by the first output means is selected . Acquisition means for acquiring image data;
First output means for sequentially thinning out and selecting pixel data at different positions of the image data according to a predetermined rule and sequentially outputting the selected image data to the display means;
Second output means for combining pixel data at different positions of the image data and outputting the combined image data to the display means;
When the display resolution of the display means is lower than the resolution of the image data, the output of the selected image data by the first output means or the output of the composite image data by the second output means Control means for performing selection control;
With
When the display frame rate of the display unit is equal to or higher than a predetermined speed, the control unit selects the output of the selected image data by the first output unit, while the display frame rate of the display unit is a predetermined speed. If it is less than 1, the output of the composite image data by the second output means is selected . The control means includes
Based on at least one of the type of display image and the operation mode, the output of the selected image data by the first output means and the output of the composite image data by the second output means are switched and selected. The display control apparatus according to claim 1 , wherein the display control apparatus is a display control apparatus. A detection means for detecting a difference between two adjacent line data among line data of a line composed of a plurality of pixels along a predetermined direction of the image based on the image data;
The control means includes
When the difference detected by the detection means is greater than or equal to a predetermined value, the output of the composite image data by the second output means is selected, while the difference detected by the detection means is less than a predetermined value The display control apparatus according to claim 2 , wherein an output of the selected image data by the first output unit is selected. The control means includes
When the display frame rate of the display means is equal to or higher than a predetermined speed, the output of the selected image data is selected by the first output means, while when the display frame rate of the display means is less than a predetermined speed, The display control apparatus according to claim 1 , wherein output of the composite image data by a second output unit is selected. The first output means includes
As the selected image data, odd line data and even line data obtained by scanning the image data are alternately selected and output,
The second output means includes
The display control apparatus according to claim 1 , wherein composite line data obtained by combining the odd line data and the even line data is output as the composite image data. The display means includes
First display means; and second display means having a display resolution that is an integral number of the display resolution of the first display means;
The resolution of the image data is the same as the display resolution of the first display means,
A third output means for outputting the image data as it is to the first display means;
The control means includes
When displaying the image based on the image data on the first display means, the output of the image data by the third output means is selected, while the image based on the image data is displayed on the second display means. when displaying, the one output of the selected image data by the first output means, or any one of claims 1 to 6, characterized in that selects the output of the synthesized image data by the second output means The display control device according to one item. Superimposed image acquisition means for acquiring superimposed image data of a superimposed image to be superimposed on an image based on the image data;
A superimposed image output means for directly outputting the superimposed image data acquired by the superimposed image acquisition means to the first display means or the second display means;
When displaying the superimposed composite image obtained by combining the superimposed image and the image based on the image data on the first display unit, the superimposed image data output by the superimposed image output unit and the third output unit When combining the output image data and displaying the superimposed composite image on the second display means, the superimposed image data output by the superimposed image output means and the first output means The display control according to claim 7 , further comprising: superimposed image synthesis means for synthesizing the selected image data to be synthesized or the synthesized image data output by the second output means. apparatus. 9. The display control apparatus according to claim 8 , further comprising storage means for storing each image data related to the composition by the superimposed image composition means. A computer of a display control device for controlling display by the display means;
Acquisition means for acquiring image data;
First output means for sequentially selecting and outputting selected image data to the display means by sequentially thinning out and selecting pixel data at different positions in the image data according to a predetermined rule;
Second output means for combining pixel data at different positions of the image data and outputting the combined image data to the display means;
When the display resolution of the display means is lower than the resolution of the image data, the output of the selected image data by the first output means or the output of the composite image data by the second output means Control means for performing selection control;
Detecting means for detecting a difference between two adjacent line data among line data of lines composed of a plurality of pixels along a predetermined direction of the image based on the image data;
To function as,
The control means selects the output of the composite image data by the second output means when the difference detected by the detection means is equal to or greater than a predetermined value, while the difference detected by the detection means A program characterized by selecting output of the selected image data by the first output means when it is less than a predetermined value . A computer of a display control device for controlling display by the display means;
Acquisition means for acquiring image data;
First output means for sequentially selecting and outputting selected image data to a display means by sequentially thinning out and selecting pixel data at different positions in the image data according to a predetermined rule;
Second output means for combining pixel data at different positions of the image data and outputting the combined image data to the display means;
When the display resolution of the display means is lower than the resolution of the image data, the output of the selected image data by the first output means or the output of the composite image data by the second output means Control means for performing selection control;
Function as
When the display frame rate of the display unit is equal to or higher than a predetermined speed, the control unit selects the output of the selected image data by the first output unit, while the display frame rate of the display unit is a predetermined speed. If the number is less than 1, the output of the composite image data by the second output means is selected. A display control method for controlling display by a display means,
Acquisition processing to acquire image data;
First output processing for sequentially selecting and outputting selected image data to a display unit by thinning out and selecting pixel data at different positions in the image data according to a predetermined rule;
A second output process of combining pixel data at different positions of the image data and outputting the combined image data to the display means;
When the display resolution of the display means is lower than the resolution of the image data, output of the selected image data by the first output process or output of the composite image data by the second output process Control processing for performing selection control;
A detection process for detecting a difference between two adjacent line data among line data of lines composed of a plurality of pixels along a predetermined direction of the image based on the image data;
With
When the difference detected by the detection process is greater than or equal to a predetermined value, the control process selects the output of the composite image data by the second output process, while the difference detected by the detection process A display control method comprising: selecting an output of the selected image data by the first output process when less than a predetermined value. A display control method for controlling display by a display means,
Acquisition processing to acquire image data;
First output processing for sequentially selecting and outputting selected image data to a display unit by thinning out and selecting pixel data at different positions in the image data according to a predetermined rule;
A second output process of combining pixel data at different positions of the image data and outputting the combined image data to the display means;
When the display resolution of the display means is lower than the resolution of the image data, output of the selected image data by the first output process or output of the composite image data by the second output process Control processing for performing selection control;
With
When the display frame rate of the display means is equal to or higher than a predetermined speed, the control process selects the output of the selected image data by the first output process, while the display frame rate of the display means is a predetermined speed. If it is less, the display control method of selecting output of the composite image data by the second output processing.

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