JP4396562B2 - Imaging apparatus and image quality display method - Google Patents

Description

  The present invention relates to an imaging device having an electronic zoom function and an image quality display method thereof.

  2. Description of the Related Art Conventionally, in a digital camera that captures and records a subject image with an image pickup device such as a CCD, as a zoom function, an optical zoom function that optically changes a focal length by a zoom lens, and the captured image data are electronically enlarged. In general, a device equipped with a so-called “electronic zoom function” is stored.

  In the optical zoom, the image size is optically enlarged or reduced, so that distortion specific to the lens appears in the image, but the image data itself does not deteriorate. On the other hand, in the electronic zoom, a part of the captured image data is cut out in a size corresponding to the zoom magnification, and is enlarged and recorded into image data of a predetermined size by interpolation processing (pixel interpolation). Therefore, although the image data size is the same as when the electronic zoom is not used, the size of the pixel area (hereinafter referred to as “substantially”) that is actually used as image data to be recorded within the entire pixel area (effective pixel area) of the image sensor. When the effective pixel size is smaller than the recorded image size, it is inevitable that the image data is substantially degraded.

In this regard, for example, Patent Document 1 described below describes an electronic camera that can be used to set / cancel the use of the electronic zoom function as necessary, or that provides notification for notifying deterioration of the image. Yes.
JP 2002-305678 A

  However, even if the electronic zoom function can be set / released as described above, or the notification for notifying the deterioration of the image is performed, the substantial effect as described above in the case where the electronic zoom is used. Deterioration of the image data cannot be avoided, and even if the size of the recorded image is displayed on the monitor, the size displayed on the screen is different between when the electronic zoom is used and when it is not used. It is the same regardless.

  Therefore, the user cannot know whether or not the image data with the required resolution (image size) and no deterioration can actually be obtained. In other words, when it is set to take an image with the number of pixels of horizontal 2560 × vertical 1920, when the electronic zoom is used, “2560 × 1920” is displayed on the monitor and the recorded image size is also set. Although it is 2560 × 1920, it is impossible to know how much the effective pixel size is. For example, when a user takes a picture for printing, and the required image size is 1600 × 1200 corresponding to 2L size, the image is actually deteriorated when printing at 2L size by using the electronic zoom. I couldn't know if it would happen.

  Therefore, there has been a problem that the usability at the time of using the electronic zoom cannot be said to be satisfactory yet.

  The present invention has been made in view of such conventional problems, and an object thereof is to provide an imaging apparatus capable of improving convenience when using an electronic zoom function and an image quality display method thereof. To do.

  In order to solve the above-mentioned problem, in the invention of claim 1, in an imaging apparatus having an electronic zoom function, an imaging means for imaging a subject image, and image data of the subject image captured by the imaging means are electronically stored. An electronic zoom means for electrically enlarging at a zoom ratio determined by a zoom function and a preset recording image size, and a substantially effective pixel size that is a size of image data to be enlarged by the electronic zoom means. Display means for displaying the resolution information shown.

  In such a configuration, during use of the electronic zoom function, the display means informs the user of the substantially effective pixel size of the image data acquired by the imaging operation with the current zoom magnification.

  In the invention of claim 2, the resolution information displayed by the display means is the effective pixel size itself.

  In the invention of claim 3, the resolution information displayed by the display means is application information indicating an application example of image data suitable for the substantial effective pixel size.

  According to a fourth aspect of the present invention, the display means displays the resolution information together with the recorded image size.

  According to a fifth aspect of the present invention, there is provided a size changing unit that changes the recorded image size to the effective effective pixel size when the effective effective pixel size is smaller than the recorded image size. did.

  In such a configuration, the upper limit of the size of the image data for the recorded image acquired by the imaging operation using the electronic zoom function is restricted to a size corresponding to the zoom magnification by the electronic zoom function.

  In the invention of claim 6, the image data of the subject image captured by the imaging means for capturing the subject image is stored in the computer of the imaging apparatus having the electronic zoom function. And a process for electrically enlarging at an enlargement ratio determined by a preset recording image size, and a process for causing the display means to display resolution information indicating a substantial effective pixel size that is the size of the image data to be enlarged. It was set as the program for running.

  According to a seventh aspect of the present invention, there is provided an image quality display method in an image pickup apparatus having an electronic zoom function, in which image data of a subject image picked up by an image pickup means is converted into a zoom magnification by an electronic zoom function and in advance. A method comprising: electrically enlarging at an enlargement ratio determined by a set recording image size; and displaying resolution information indicating a substantially effective pixel size, which is the size of image data to be enlarged, on a display unit; did.

  According to such a method, during use of the electronic zoom function, the display unit notifies the user of the substantially effective pixel size of the image data acquired by the imaging operation with the current zoom magnification.

  As described above, according to the imaging apparatus and the image quality display method of the present invention, during use of the electronic zoom function, the effective effective pixel size of the image data acquired by the imaging operation with the current zoom magnification is used by the display unit. To be informed by the person. Therefore, when using the electronic zoom function, it is possible to notify the user whether or not image data corresponding to the purpose of use can be obtained, and to improve convenience when using the electronic zoom function. It becomes possible.

  In particular, according to the fifth aspect of the present invention, the upper limit of the size of the image data for the recorded image acquired by the imaging operation using the electronic zoom function is restricted to a size corresponding to the zoom magnification by the electronic zoom function. I made it. Therefore, it is possible to reliably prevent the deterioration of the image data for the recorded image accompanying the use of the electronic zoom function.

(Embodiment 1)
1A and 1B are views showing the external appearance of a digital camera 1 according to the present embodiment. FIG. 1A is a perspective view as viewed from the front upper side, and FIG. This digital camera 1 is provided with a still image / moving image recording / reproducing function and a zoom function including an optical zoom and an electronic zoom, and has the following configuration. The zoom magnification is 3 times for both optical zoom and electronic zoom (9 times when used in combination).

  As shown in FIG. 1A, a photographing lens 3, an optical viewfinder 4, and a strobe light emitting unit 5 are arranged on the front surface of a substantially rectangular thin camera body 2, and on the right end side (for the user) of the upper surface thereof. A power key 6 and a shutter key 7 are arranged. The photographing lens 3 is a collapsible type including a zoom lens and a focus lens, and is stored in the camera body 2 when the power is turned off and the playback mode is set. The shutter key 7 can be operated in two stages, a half-pressed position and a fully-pressed position.

  As shown in FIG. 1B, on the back of the digital camera 1, the optical viewfinder 4, the recording mode setting switch 8, the playback mode setting switch 9, the zoom operation key 10, the menu key 11, and the four-direction key 12 are provided. The switches of the set key 13 and the display key 14 inside the liquid crystal monitor 15 are disposed. The liquid crystal monitor 15 is composed of, for example, a color liquid crystal display panel with a backlight, and displays a subject image (through image) and various shooting information described later during shooting standby in a recording mode. The display means of the present invention displays a menu screen and various setting screens for setting the recording image size.

Here, there are the following five image sizes (resolutions) that can be set when taking a still image in the digital camera 1. The parenthesized parentheses are general uses suitable for each image size (horizontal x vertical).
・ 2560 × 1920 ≒ 4.9 megapixel (A3 printing)
・ 2048 × 1536 ≒ 3.1 megapixel (A4 printing)
・ 1600 × 1200 ≒ 1.9 megapixel (2L size printing)
・ 1280 × 960 ≒ 1.2 megapixel (L size printing)
・ 640 × 480 ≒ 0.3 megapixel (website, e-mail)

  Although not shown, the digital camera 1 is provided with a memory card slot or the like on the bottom surface of the digital camera 1 for attaching / detaching a memory card as a recording medium for image recording.

  FIG. 2 is a block diagram showing an electrical configuration of the digital camera 1. The lens optical system 21 constituting the photographing lens 3 described above is driven by a lens motor 22 to adjust the zoom magnification and focus position. Although not shown in the drawing, the lens motor (M) 22 is actually provided for a zoom lens and a focus lens, respectively. A diaphragm 23 is disposed behind the optical axis of the lens optical system 21, and the degree of opening of the diaphragm 23 is adjusted by an actuator (A) 24. Further, a CCD 25 as an image pickup means is disposed behind the optical axis. In the photographing mode, the CCD 25 is scan-driven by a vertical driver 27 at a driving timing generated by a timing generator (TG) 26, and outputs one photoelectric conversion output corresponding to a light image formed on the exposure surface at a constant cycle. Output minutes.

  The output of the CCD 25, that is, the imaging signal is sampled and held by a sample and hold circuit (S / H) 28, and converted to digital data (imaging signal) for each RGB primary color component by an A / D converter 29. The converted image signal is subjected to color process processing including pixel interpolation processing and γ correction processing in the color process circuit 30, and then converted into a digital luminance signal Y and color difference signals Cb, Cr as DMA (Direct Memory Access). It is output to the controller 31.

  The DMA controller 31 temporarily transmits the luminance signal Y and the color difference signals Cb and Cr output from the color process circuit 30 to an internal buffer using the composite synchronization signal, memory write enable signal, and clock signal from the color process circuit 30. The DMA transfer is performed to the DRAM 33 used as a buffer memory via the writing and DRAM interface (I / F) 32. The luminance and color difference signals for one screen transferred to the DRAM 33 are read from the DRAM 33 by the control unit 34 via the DRAM interface 32 and written to the VRAM 36 via the VRAM controller 35.

  The control unit 34 includes a CPU, a ROM storing an operation program necessary for controlling each unit by the CPU, a RAM used as a work memory, and the like, and controls the entire digital camera 1. The ROM causes the CPU to perform AF control, AE control, and AWB control in the shooting mode, and causes the CPU to function as the electronic zoom unit of the present invention by performing processing described later in the shooting mode. A program is also stored.

  The digital video encoder 37 periodically reads the luminance and color difference signals from the VRAM 36 via the VRAM controller 35, generates a video signal based on these data, and outputs the video signal to the display unit 38. The display unit 38 is composed of the liquid crystal monitor 15 and its driving circuit. In the shooting mode, the display unit 38 displays in real time an image captured at that time, that is, a through image by a display operation based on a video signal from the digital video encoder 37. indicate. The through image is updated at the slew rate of the CCD 25 (for example, 30 sheets / second), whereby the liquid crystal monitor 15 functions as an electronic viewfinder.

  The key input unit 39 is composed of each switch such as the shutter key 7 described above, and a signal accompanying the key operation is sent to the control unit 39. When the through image is displayed on the display unit 38, when the user fully presses the shutter key 7, a trigger signal is output from the key input unit 39 accordingly. In response to this trigger signal, the control unit 34 temporarily stops the flow of signals from the CCD 25 to the DRAM 33 immediately after the completion of the DMA transfer of the luminance and color difference signals for one screen captured from the CCD 25 to the DRAM 33 at that time. , Transition to the record storage state.

  In this recording and storage state, the control unit 34 transmits the luminance and color difference signals for one frame written in the DRAM 33 to the basic 8 pixels × 8 pixels for each of Y, Cb, and Cr components via the DRAM interface 32. The data is read out in units called blocks, and written into a JPEG (Joint Photographic Coding Experts Group) circuit 40. In the JPEG circuit 40, data compression is performed by a process such as ADCT (Adaptive Discrete Cosine Transform), Huffman coding which is an entropy coding method, or the like.

  The compressed code data is read as a data file of one image by the control unit 34, and a memory card 41 that is detachably attached to the digital camera 1 or a built-in memory 42 that is fixedly built in the digital camera 1. It is written in either one of When the writing operation is completed, the control unit 34 resumes the signal flow from the CCD 25 to the DRAM 33.

  In addition, a strobe driving unit 43 is connected to the control unit 34. The strobe driving unit 43 includes a strobe capacitor (not shown), a charging circuit thereof, a boosting circuit, and the like, and flash-drives the strobe light emitting unit 5 based on the control from the control unit 34 when taking a still image.

  On the other hand, in the playback mode, the control unit 34 selectively reads out image data recorded in the memory card 41 or the built-in memory 42 according to a key operation by the user, and the JPEG circuit 40 compresses the data in the shooting mode. The compressed image data is decompressed in the reverse procedure. The decompressed image data is held in the DRAM 33 via the DRAM interface 32, and the held contents are stored in the VRAM 36 via the VRAM controller 35, and a video signal is generated based on the image data periodically read therefrom. As a result, the recorded image is reproduced and output on the display unit 38.

  Next, the operation at the time of still image shooting when the shooting mode is set in the digital camera 1 having the above configuration will be described. First, basic operations during still image shooting will be described first. That is, the digital camera 1 locks the focus state by the AF operation when the shutter key 7 is half-pressed, and simultaneously locks the exposure control state by the AE control and the white balance state by the AWB control, and then the shutter key. When 7 is fully pressed (when a shooting operation is performed), shooting is performed in the previously locked focus state, exposure control state, and white balance state. The AF control is control by a contrast detection method using a predetermined focus area as an evaluation area.

  FIG. 3 is a flowchart showing the contents of the shooting process according to the present invention other than the basic operation described above, which is executed by the control unit 34 when shooting a still image.

  The control unit 34 immediately starts imaging at a predetermined slew rate by the CCD 25 and display of a through image by the display unit 38 of the captured subject as the imaging process starts (step SA1). Next, if there is no zoom operation with the zoom operation key 10 (NO in step SA2), immediately after performing a shooting information display process described later (step SA6), there is no shooting instruction by fully pressing the shutter key 7 (step SA6). If NO in SA7), the process returns to Step SA2.

  When there is a zoom operation (YES in step SA2), it is further confirmed whether or not the zoom magnification after the change associated with the operation is an electronic zoom region, and is not an electronic zoom region (in step SA3). NO), after driving the zoom lens to the tele side or wide side (step SA4), the photographing information display process is performed (step SA6). If the zoom magnification after the change is the electronic zoom area (YES in step SA3), the readout area of the imaging data from the CCD 25 at the time of imaging at the slew rate is set according to the electronic zoom magnification (already the electronic zoom After the change is made (step SA5), photographing information display processing is performed (step SA6).

  FIG. 4 is a flowchart showing the contents of the photographing information display process described above. First, when the zoom is not in use at the beginning of the operation (NO in step SB1), the zoom gauge for indicating the zoom magnification and the effective pixel size are set to non-display (step SB2), and then immediately the memory card 41. The remaining number of images that can be captured is calculated based on the available space and the recorded image size set at that time, that is, any one of the five sizes described above (step SB8), and various types of imaging information are stored. The process is superposed on the through image and displayed on the liquid crystal monitor 15 (step SB9), and the process returns to FIG.

  FIG. 5 is a diagram showing various types of shooting information displayed on the liquid crystal monitor 15 in step SB9 when the zoom is not in use. That is, in the shooting information display process, as shown in the figure, the set recording image size 101, the remaining recordable number 102 calculated in step SB8, and the shooting mode type (here, still image) (Image shooting mode) 103, AF area 104, battery remaining amount 105, shutter speed 106, aperture value 107, and date / time 108 are displayed. FIG. 5 shows a case where the recorded image size 101 is “2560 × 1920”.

  On the other hand, if the zoom is in use during the shooting information display process (YES in step SB1), after setting the display of the zoom gauge to indicate the zoom magnification (step SB3), the zoom magnification is the electronic zoom area. (Step SB4). If it is not the electronic zoom area (NO in step SB4), the remaining number of shootable images is calculated (step SB8), and various types of shooting information are superimposed on the through image and displayed on the liquid crystal monitor 15 (step SB9).

  FIG. 6A is a diagram corresponding to FIG. 5 showing various types of shooting information displayed on the liquid crystal monitor 15 in the above case. In such a case, in addition to the shooting information shown in FIG. 5, a zoom gauge 109 indicating the zoom magnification is displayed superimposed on the through image. In the present embodiment, the zoom gauge 109 has a scale bar that has a left end at the wide end (W) and a right end at the tele end (T) as shown in the drawing and indicates an optical zoom area and an electronic zoom area, and an upper side thereof. The cursor is an inverted triangle that moves along the line, and indicates the zoom magnification at the cursor position.

  If the determination result in step SB4 is YES and the zoom magnification at that time is the electronic zoom region, the effective pixel size corresponding to the electronic zoom magnification is equal to or larger than the recording image size set at that time. It is confirmed whether or not there is (step SB5). If it is equal to or larger than the recording image size (YES in step SB5), the display method of the effective effective pixel size is set to normal display (step SB6), and conversely if it is smaller than the recording image size (NO in step SB5). The display method of the effective effective pixel size is set to blinking display (step SB7). Thereafter, as described above, the remaining number of shootable images is calculated and various types of shooting information are displayed (steps SB8 and SB9).

  FIG. 6B shows a case where the zoom magnification is 6 times (the electronic zoom magnification is 2 times) and the actual effective pixel size is smaller than the recorded image size, that is, the actual effective pixel size is the recorded image size “2560 ×. FIG. 6 is a diagram corresponding to FIG. 5 showing various types of shooting information displayed on the liquid crystal monitor 15 when “1810 × 1357”, which is 1/2 of “1920”. In such a case, in addition to the other photographing information described above, the effective effective pixel size 110 (“1810 × 1357”) is displayed in blinking in parentheses below the recording image size “2560 × 1920”. Although not shown, when the recorded image size is set to “1600 × 1200”, “1810 × 1357” is displayed as the effective pixel size 110 without blinking.

  Then, after the above-described shooting information display process is completed, the control unit 34 returns to the process of FIG. 3 to check whether there is a shooting instruction by fully pressing the shutter key 7, and if there is no shooting instruction (in step SA7). NO), it returns to step SA2 as it is and repeats the process described above.

  Eventually, if there is a shooting instruction (YES in step SA7), the CCD 25 is exposed and an image having a substantially effective pixel size corresponding to the electronic zoom magnification at that time (1x when the electronic zoom is not used). Data is read (step SA8). If the effective pixel size is equal to or larger than the recording image size (YES in step SA9), the read image data is thinned out and reduced to the recording image size (step SA10), and the reduced image data is stored in the memory. Recording is performed on the card 41 (step SA12). If the effective pixel size is smaller than the recorded image size (NO in step SA9), the image data read in step SA8 is interpolated and enlarged to the recorded image size (step SA11). Image data is recorded in the memory card 41 (step SA12). Note that the image data read in step SA8 is recorded even when the electronic zoom is not used.

  As described above, in the present embodiment, when the electronic zoom is used, the effective effective pixel size 110 is displayed on the through image together with the recorded image size 101. It is possible to make the user confirm whether an image having a recording image size 101) or an image having a resolution suitable for a desired application can be obtained. It is also possible to teach the user how much zoom-in can be performed while obtaining an image with a desired resolution, that is, within a range that does not cause image degradation. Therefore, the convenience when using the electronic zoom function can be improved.

  In the present embodiment, the effective effective pixel size 110 that changes depending on the electronic zoom magnification is displayed together with the set recording image size 101 in the shooting information display processing in step SA6. It may be.

  In other words, the ROM of the control unit 34 has five types of image sizes (resolutions) that can be set when taking a still image with the digital camera 1 described above, and general uses (A3 printing, A4) in which each image size (horizontal × vertical) is suitable. Correspondence information indicating a correspondence relationship with the printing etc. is stored. In the above-described photographing information display process (FIG. 4), for example, immediately after step SB5, based on the correspondence information, a use capable of obtaining the original resolution based on the actual effective pixel size at that time is determined. In SB6 and SB7, the display method of the determined use may be set, and in the subsequent step SB9, the use may be displayed on the through image according to the set setting method.

  That is, FIG. 7 is a diagram corresponding to FIG. 6B in that case. In this example, since the effective pixel size is “1810 × 1357”, the character “2L size” indicating 2L size printing is used as the usage information 201 indicating the general usage by which the original resolution can be obtained. Is displayed together with the recorded image size 101.

  According to such a modification, it is possible to directly tell the user how much an image suitable for the application can be recorded without causing deterioration at the current zoom magnification, and thus the convenience is improved. Further improvement can be achieved. In particular, the above effect is significant for a user who does not know the relationship between the recorded image size 101 and a general application suitable for it.

  Furthermore, although the description has been given here of the case where the effective effective pixel size 110 or the usage information 201 is displayed on the through image together with the recording image size 101, the effective effective pixel size 110 or the usage is not displayed without displaying the recording image size 101. Only the information 201 may be displayed on the through image.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. In this embodiment, in the digital camera 1 configured as shown in FIGS. 1 and 2, the ROM of the control unit 34 causes the control unit 34 (CPU) to function as the electronic zoom unit and the size changing unit of the present invention. If the effective effective pixel size is smaller than the recorded image size when shooting using electronic zoom, the recorded image size is automatically reduced to the effective effective pixel size, that is, enlargement processing by pixel interpolation The image capturing process for recording the captured image data is performed without performing the above.

  FIG. 8 shows the details of the photographing process executed by the control unit 34 when photographing a still image in the present embodiment. As is apparent from the figure, the processing from step SC1 to step SC8 is the same as the processing from step SA1 to step SA8 described in FIG. 3 in the first embodiment, and the photographing information display processing in step SC6. The process shown in FIG. Also in this embodiment, if the effective pixel size is equal to or larger than the recording image size (YES in step SC9), the read image data is thinned and reduced to the recording image size (step SC10), and then reduced. The subsequent image data is recorded on the memory card 41 (step SC11). However, in this embodiment, when the effective pixel size is smaller than the recording image size (NO in step SC9), the image data read in step SC8 is recorded in the memory card 41 with the same size (step S9). SC11).

  According to the second embodiment described above, when the effective effective pixel size is smaller than the recorded image size, the recorded image size is automatically changed to the effective effective pixel size. Therefore, it is possible to reliably prevent the deterioration of the image data for the recorded image accompanying the use of the electronic zoom function. In addition, for example, when the pre-selected recorded image size is larger than the originally required image size, the size of the recorded image does not become unnecessarily large. It is possible to reliably prevent the storage capacity of the memory 41 from being wasted.

  Further, in the shooting information display process of step SC6, as in the first embodiment, the shooting calculated based on the free space of the memory card 41 and the recorded image size (2560 × 1920 etc.) set at that time. Although the possible remaining number is displayed, the remaining shootable number is calculated based on the free space of the memory card 41 and the actual effective pixel size (actual recorded image size) corresponding to the electronic zoom magnification at that time. , It may be displayed.

  In the above description, the case where the present invention is applied to a general digital camera having a zoom function including an optical zoom and an electronic zoom has been described. However, the present invention is not limited to an optical zoom but only an electronic zoom. It can also be adopted for a digital camera having Further, in addition to a general digital camera, the present invention can be applied to other imaging apparatuses incorporated in an information processing apparatus with a camera such as a mobile phone with a camera and a PDA.

It is a figure which shows the external appearance of the digital camera common to each embodiment of this invention. FIG. 2 is a block diagram showing an electrical configuration of the digital camera. It is a flowchart which shows the imaging | photography process which concerns on this invention in 1st Embodiment. It is a flowchart which shows the content of the imaging | photography information processing common to 1st and 2nd embodiment. It is a figure which shows the example of a display screen of a liquid crystal monitor in the state where the zoom function is not used which is common to 1st and 2nd embodiment. FIG. 6 is a diagram illustrating an example of a display screen of a liquid crystal monitor in a state where a zoom function is used, which is common to the first and second embodiments, where (a) is a state where only an optical zoom is used; b) is a diagram showing a state in which optical zoom and electronic zoom are used. It is a figure which shows the other example of a display screen of a liquid crystal monitor in the state in which the optical zoom and the electronic zoom are used. It is a flowchart which shows the imaging | photography process which concerns on this invention in 2nd Embodiment.

Explanation of symbols

3 Shooting Lens 7 Shutter Key 10 Zoom Operation Key 15 LCD Monitor 25 CCD
33 DRAM
34 Control unit 38 Display unit 39 Key input unit 40 JPEG circuit 41 Memory card 42 Built-in memory

Claims (7)

In an imaging device having an electronic zoom function,
An imaging means for imaging a subject image;
Electronic zoom means for electrically enlarging the image data of the subject image picked up by this image pickup means at a zoom magnification by an electronic zoom function and a magnification determined by a preset recording image size;
An image pickup apparatus comprising: display means for displaying resolution information indicating a substantially effective pixel size that is a size of image data to be enlarged by the electronic zoom means.   2. The imaging apparatus according to claim 1, wherein the resolution information displayed by the display means is the effective pixel size itself.   The imaging apparatus according to claim 1, wherein the resolution information displayed by the display unit is application information indicating an application example of image data suitable for the effective pixel size.   The imaging apparatus according to claim 1, wherein the display unit displays the resolution information together with the recorded image size.   5. The apparatus according to claim 1, further comprising a size changing unit configured to change the recorded image size to the substantially effective pixel size when the substantially effective pixel size is smaller than the recorded image size. The imaging device according to item. In the computer that the imaging device having the electronic zoom function has,
Processing for electrically enlarging the image data of the subject image picked up by the image pickup means for picking up the subject image at a zoom magnification by the electronic zoom function and an enlargement ratio determined by a preset recording image size;
A program for causing the display means to display resolution information indicating the effective pixel size that is the size of the image data to be enlarged. An image quality display method in an imaging device having an electronic zoom function,
Electrically enlarging the image data of the subject image captured by the imaging means with a zoom magnification by an electronic zoom function and a magnification that is determined by a preset recording image size;
And displaying the resolution information indicating the effective pixel size, which is the size of the image data to be enlarged, on the display means.

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