JP4872801B2 - Imaging apparatus, imaging method, and imaging program - Google Patents

Description

  The present invention relates to an imaging apparatus, for example, an imaging apparatus, an imaging method, and an imaging program capable of displaying in advance the quality related to image recording when a through image being displayed is recorded according to the amount of camera shake.

  Conventionally, for example, a technique described in Patent Document 1 is known as a technique for detecting a camera shake amount and displaying it on a through image.

Patent Document 1 discloses a technique for displaying a through image and displaying the amount of camera shake in a graph at the lower part of a display unit.
JP 2006-180471 A

  However, in the case of the above-mentioned patent document 1, even if the camera shake amount is displayed in a graph, when recording in the state of the camera shake amount, it is recorded at any shooting condition, for example, shutter speed or ISO sensitivity. The user could not confirm. In addition, there is a problem that it is difficult to know how much the camera shake can be recorded with the quality desired by the user unless it is recorded once.

  The present invention has been made in view of the above, and an object thereof is to provide an imaging apparatus, an imaging method, and an imaging program that allow a user to confirm the quality of an image when recording in advance.

The invention of claim 1 of the present application is an imaging means, an imaging condition storage means storing a plurality of types of imaging conditions capable of recording an image that does not shake relative to the camera shake amount in association with the camera shake amount, and a display means. Detecting means for detecting the amount of camera shake, ratio calculating means for calculating a ratio of the amount of camera shake detected by the detecting means to the maximum allowable shake amount stored in advance, and detecting from the photographing condition storage means by the detecting means. A reading unit that reads an image capturing condition capable of recording an image that does not shake with respect to the amount of camera shake, and an image captured by the image capturing unit and the image capturing condition read by the reading unit as the ratio calculating unit. Display control means for controlling the display means so as to be displayed in association with the indexed ratio calculated by the above.

  The invention of claim 2 of the present application is characterized in that, in the invention of claim 1, the photographing condition is a shutter speed at the time of recording the image.

  The invention of claim 3 of the present application is characterized in that, in the invention of claim 1, the photographing condition is ISO sensitivity information at the time of recording the image.

The invention according to claim 4 of the present application estimates the amount of noise when the image is recorded according to the amount of camera shake detected by the detection means in the invention according to any one of claims 1 to 3. and estimating means, further comprising a processing means for processing by adding a guess noise by the estimating means to the image to be captured, the display control unit further image which has been processed by said processing means to said display means It is characterized by displaying.

  The invention of claim 5 of the present application further comprises selection means for selecting a uniform color region from the captured image in the invention of claim 4, and the processing means is selected by the selection means. It is characterized in that noise is added to the processed area for processing.

  The invention according to claim 6 of the present application is the invention according to claim 5, wherein the display control means controls to display the image processed by the processing means and the region to be processed in association with each other. It is characterized by that.

The invention of claim 7 includes a detection step for detecting a shake amount, a ratio calculation step for calculating a ratio of the shake amount detected in the detection step with respect to a preliminarily stored maximum allowable shake amount, and a shake amount in advance. Recording an image that does not shake with respect to the camera shake amount detected in the detection step from a storage unit that stores a plurality of shooting conditions that can record an image that does not shake with respect to the camera shake amount A readout step of reading out imaging conditions that can be performed, and an image captured by the imaging unit and the imaging conditions read out in the readout step as an index of the ratio calculated in the ratio calculation step characterized in that it comprises a display control step of controlling to display on the display unit in association.

The invention of claim 8 of the present application relates to a computer provided in an imaging apparatus having a display unit , a detection means for detecting a shake amount, and a ratio of the shake amount detected by the detection means to a maximum allowable shake amount stored in advance. A ratio calculating means for calculating, with respect to the camera shake amount detected by the detecting means from a storage unit storing a plurality of kinds of photographing conditions capable of recording an image that does not shake in association with the camera shake amount in advance. Reading means for reading out shooting conditions capable of recording images that cannot be shaken, and a captured image read out by the reading means with the ratio calculated by the ratio calculating means as an index It is made to function as a display control means for controlling to display on the display unit in association with each other.

  According to the present invention, the user can confirm the quality of an image when recording in advance.

Embodiments of the present invention will be described below with reference to the drawings.
First Embodiment FIG. 1 is a front view (FIG. 1A) and a rear view (FIG. 1B) showing the appearance of an electronic camera that is a first embodiment of an imaging apparatus according to the present invention. It is.

  As shown in FIG. 1A, the electronic camera has a strobe light emitting unit 1 and a photographing lens (lens group) 2 on the front side. Further, on the back of the electronic camera, as shown in FIG. 1B, a mode dial 3, a display monitor 4, a cursor key 5, a SET key 6, a zoom key 7 (W key 7-1, T key 7-2), A camera shake correction function key 10 and the like are provided. In addition, a shutter key 8 and a power key 9 are provided on the upper surface, and although not shown, a USB terminal connection is used on the side portion when connecting to an external device such as a personal computer (PC) or a modem with a USB cable. Is provided.

  FIG. 2 is a block diagram for explaining the configuration of the electronic camera according to the first embodiment of the present invention.

  The photographing lens 2 includes a zoom lens 2a, a focus lens 2b, and a correction optical system 21. The zoom lens 2a is driven back and forth in the optical axis direction by a zoom control mechanism (not shown). As the zoom lens 1a is driven forward and backward, the shooting angle of view changes. The focus lens 2b is driven back and forth in the optical axis direction by a focus control mechanism. The focus lens 2b is driven back and forth to adjust the focus of the photographing lens 2. The correction optical system 21 is driven (moved) by an actuator provided in the correction optical system drive unit 26 so as to cancel out camera shake in a direction orthogonal to the optical axis. When the correction optical system 21 is driven, the subject image formed on the imaging surface of the imaging element 22 is shifted.

  The image sensor 22 is configured by a CMOS or the like. The imaging element 22 captures a subject image formed on the imaging surface and outputs an imaging signal. The signal processing unit 30 performs predetermined signal processing (for example, color interpolation processing, γ correction processing, white balance processing, shading correction processing, etc.) after converting the analog imaging signal into a digital signal. The timing generation unit 29 generates a read timing signal for an image pickup signal read from the image sensor 22.

  The angular velocity sensor 24 physically and directly detects the movement of the electronic camera, and outputs a motion detection signal indicating the angular velocity to the camera control unit 36.

  The optical shake correction processing unit 25 is provided in the camera control unit 36, has a conversion table that outputs a correction amount corresponding to the magnitude of the detection signal from the angular velocity sensor 24, and corrects from the camera control unit 36. Upon receiving a start command, the system is activated, calculates a correction amount according to a detection signal detected by the angular velocity sensor 24, and drives the correction optical system 21 to the correction optical system driving unit 26.

  The correction optical system driving unit 26 drives the correction optical system 21 in a direction orthogonal to the optical axis of the photographing lens 2 in accordance with the correction amount from the camera control unit 36. The driving amount of the correction optical system 21 is determined by the optical shake correction processing unit 25.

  The image processing unit 31 converts the format of the image data input from the signal processing unit 30 into a predetermined data format, or gives the image data to the display processing unit 32. The display processing unit 32 generates a video signal using the image data and sends it to the display monitor 4.

  The display monitor 4 is configured by a liquid crystal display panel or the like, and displays an image or the like based on a video signal input from the display processing unit 32. The display image is recorded in the recording unit 34, a through image sequentially captured by the image sensor 22 before the still image capturing instruction, a still image captured by the image sensor 22 after the still image capturing instruction, a moving image at the time of moving image capturing. There are playback images based on image data. These images can be displayed on the display monitor 4 by electrically changing the display angle of view (electronic zoom) by operating the operation unit 35.

  The recording unit 34 is configured by a removable memory card or the like. In the shooting mode, the recording unit 34 records the image data whose format has been converted by the image processing unit 31. In the reproduction mode, the image data recorded in the recording unit 34 is read and sent to the image processing unit 31. The image processing unit 31 generates a video signal for displaying a reproduced image. Note that the electronic camera is configured so that each of a still image shooting mode and a moving image shooting mode can be selected, and audio data may be recorded at the time of moving image shooting.

  The operation unit 35 includes the mode dial 3, the cursor key 5, the SET key 6, the zoom key 7, the shutter key 8, the power key 9, the camera shake correction function key 10, and the like shown in FIG. Is transmitted to the camera control unit 36.

  The camera control unit 36 includes a CPU, a ROM in which a control program executed by the CPU is stored, and a work RAM (not shown), and commands each block in accordance with an operation signal input from the operation unit 35. Output and control camera operation. The ROM includes a zoom table in which zoom magnification corresponding to zoom position (number of zoom steps) information is stored. The camera control unit 36 is activated in response to a correction command, calculates an amount of correction in accordance with a detection signal detected by the angular velocity sensor 24, and outputs an optical shake correction processing unit 25 to the correction optical system driving unit 26. A noise amount estimation processing unit 27 that estimates a noise amount at the time of photographing according to a detection signal detected by the angular velocity sensor 24 and outputs the estimated noise amount to the display processing unit 32 is provided. The specific operation of the noise amount estimation processing unit 27 will be described in detail in the second embodiment.

  The device information storage unit 37 is based on a maximum allowable shake amount allowed for the photographing lens 2 and a performance information storage unit 371 for storing performance information of the image sensor 22, ISO sensitivity, shutter speed, f value, and camera shake amount. And a performance information storage unit 372 for storing a table for estimating the noise amount value n.

  FIG. 3 is a flowchart showing a schematic operation of the electronic camera of the present invention, and this flowchart is for explaining a main program of the electronic camera. The processing shown below will be basically described with an example in which the camera control unit 36 executes according to a program stored in advance in a program memory such as a flash memory. Hereinafter, description will be made based on the flowchart shown in FIG. The electronic camera will be described below as having a zoom function and an autofocus function.

  In FIG. 3, when the user operates the power key 9 shown in FIG. 1 to turn on the main power of the electronic camera and operates the mode dial 3 to set the shooting mode, the camera control unit 36 detects this, In step S10, initial values and initial photographing conditions input to each circuit unit are read out and set in each circuit unit.

  Next, in step S15, the camera control unit 36 determines whether or not the through image display is set to ON, that is, the through image display is set in the set shooting mode. If ON is set, the process proceeds to step S20. If ON is not set, the process proceeds to step S30.

  In step S20, the camera control unit 36 starts through image display. That is, the camera control unit 36 outputs a start signal related to the through image display process to the timing generation unit 29. In response to this, the timing generator 29 outputs a timing signal to the image sensor 22 and the signal processor 30. The image sensor 22 outputs the captured image signal to the signal processing unit 30, the signal processing unit 30 generates image data from the image signal and outputs the image data to the image processing unit 31, and the image processing unit 31 formats the image data. The image is converted and output to the display processing unit 32, and the display processing unit 32 generates a video signal from the image data and displays the through image on the display monitor 4. As a result, a through image as shown in FIG. 7 is displayed on the display monitor 4. Note that although the image shown in FIG. 7 looks like a still image due to drawing restrictions, the through image is updated at predetermined time intervals.

  As shown in FIG. 7, the display screen 50 of the display monitor 4 includes a bar graph display area 52 for indicating the current camera shake amount as a bar graph 55, an f value display area 54 for indicating a recommended f value, An imaging condition display area 56 for indicating imaging conditions corresponding to the recommended f value, and a sub display area for indicating imaging conditions corresponding to the second candidate f value when the recommended f value is changed. 58 is provided.

  Next, in step S30, the camera control unit 36 checks whether or not there is a zoom instruction based on the operation unit 35 shown in FIG. 2, more specifically, a signal from the zoom key 7, and if there is a zoom instruction, step S40. If there is no zoom instruction, the process proceeds to step S50.

  Next, if there is a zoom instruction in step S40, the camera control unit 36 controls the photographing lens 2 to perform zoom processing. That is, a control signal is sent to a zoom (ZOOM) driver (not shown), the zoom motor is driven to move the lens to the zoom position corresponding to the designated zoom stage, and the process proceeds to step S50. The camera control unit 36 stores the current zoom position (number of zoom steps) in the work RAM.

  Next, in step S50, the camera control unit 36 checks whether or not a half-press operation of the shutter key 8 has been started based on a signal from the operation unit 35. When the half-pressing operation of the shutter key 8 is started, the process proceeds to step S60, and when the half-pressing operation of the shutter key 8 is not started, the process returns to step S15.

  Next, when the half-press operation of the shutter key 8 is started, in step S60, the camera control unit 36 performs autofocus (AF) at a focal length corresponding to the zoom position (number of zoom steps) selected at that time. Processing, automatic exposure measurement (AE) processing, and automatic white balance (AWB) control processing are executed. Then, the camera control unit 36 reflects the results of the various processes in step S60 on each unit, and again connects the image data acquired through the image sensor 22 and the signal processing unit 30 from the image processing unit 31 to the display processing unit 32. Is displayed on the displayed monitor 4.

  Next, in step S70, the camera control unit 36 checks whether or not the shutter key 8 has been fully pressed. If the shutter key 8 is fully pressed, the process proceeds to step S80, and if the shutter key 8 is not fully pressed, the process proceeds to step S75.

  Next, in step S75, the camera control unit 36 checks whether the half-press operation of the shutter key 8 is released based on the signal from the operation unit 35. If the half-press operation of the shutter key 8 is released, the process returns to step S30, and if the half-press operation of the shutter key 8 is not released, the process returns to step S70.

  Next, when the shutter key 8 is fully pressed, the camera control unit 36 acquires a new image signal used for a still image from the image sensor 22 in step S80. That is, the camera control unit 36 outputs a start signal related to the still image acquisition process to the timing generation unit 29. In response to this, the timing generator 29 outputs a timing signal to the image sensor 22 and the signal processor 30. The imaging element 22 outputs the captured high-definition image signal to the signal processing unit 30, the signal processing unit 30 generates image data from the image signal and outputs the image data to the image processing unit 31, and the image processing unit 31 is 1 The image data (still image data) for the frame is subjected to JPEG compression processing, the compressed still image data is recorded in the recording unit 34, the still image for one frame is photographed, and the process returns to step S15.

  FIG. 4 is a flowchart for explaining camera shake control processing of the electronic camera which is the first embodiment of the imaging apparatus according to the present invention. It is assumed that the camera shake control process shown in FIG. 4 is executed in parallel with the process of the schematic operation of the electronic camera shown in FIG.

  By the way, when the user operates the camera shake correction function key 10, an ON / OFF operation signal corresponding to the user's operation is input to the operation unit 35. At this time, since the operation unit 35 generates an interrupt signal and outputs it to the camera control unit 36, the camera control unit 36 sets a flag indicating the operation content in an ON / OFF setting flag area of a memory (not shown).

  In FIG. 4, in step S110, the camera control unit 36 checks the ON / OFF setting flag area set by the operation unit 35, and determines whether or not the camera shake correction function is set to ON.

  If it can be determined in step S110 that the camera shake correction function is set to ON, in step S113, the camera control unit 36 gives a start signal to the angular velocity sensor 24 to detect the shake amount generated in the electronic camera. To start.

  The shake amount information (detection signal) generated in the electronic camera detected by the angular velocity sensor 24 is input to the camera control unit 36 or the optical shake correction processing unit 25 provided in the camera control unit 36.

  Next, in step S115, the camera control unit 36 checks the ON / OFF setting flag area set by the operation unit 35, and determines whether or not the camera shake correction function is set to OFF.

  When the camera shake correction function is set to OFF, the process proceeds to step S117, and the camera control unit 36 gives a stop signal to the angular velocity sensor 24 to stop detecting the shake amount generated in the electronic camera, and returns to step S110. . Note that, when the camera shake correction function is set to OFF, when the correction optical system 21 is driven, the drive is stopped.

  On the other hand, when the camera shake correction function is not set to OFF in step S115, that is, when the camera shake correction function is continuously set to ON, the process proceeds to step S119.

  Next, in step S119, the camera control unit 36 sends a correction command to the optical shake correction processing unit 25. The optical shake correction processing unit 25 is activated upon receiving a correction command from the camera control unit 36, calculates a correction amount according to the detection signal detected by the angular velocity sensor 24, and sends the correction amount to the correction optical system driving unit 26, step S115. Proceed to At this time, the correction optical system driving unit 26 drives the correction optical system 21 according to the correction amount from the optical shake correction processing unit 25.

  FIG. 5 is a flowchart for explaining a through image display process of the electronic camera which is the first embodiment of the imaging apparatus according to the present invention. It is assumed that the through image display process shown in FIG. 5 is executed in parallel with the outline operation process of the electronic camera shown in FIG.

  As described above, when the user operates the camera shake correction function key 10, an ON / OFF operation signal corresponding to the user's operation is input to the operation unit 35, and the operation unit 35 generates an interrupt signal and the camera control unit 36. Therefore, the camera control unit 36 sets a flag indicating the operation content in an ON / OFF setting flag area of a memory (not shown).

  5, in step S210, the camera control unit 36 checks the ON / OFF setting flag area set by the operation unit 35, and determines whether or not the camera shake correction function is set to ON.

  When it is determined in step S210 that the camera shake correction function is not set to ON, in step S215, the camera control unit 36 outputs a through display command to the image processing unit 31 and inputs it from the signal processing unit 30. The displayed image data is output to the display processing unit 32. The display processing unit 32 generates a video signal using the image data, and the display monitor 4 displays a through image based on the generated video signal.

  Here, in step S220, the camera control unit 36 determines whether or not a certain time has elapsed using a timer (not shown) provided therein, and if the certain time has not elapsed, returns to step S215. If the predetermined time has elapsed, the process returns to step S210.

  On the other hand, if it can be determined in step S210 that the camera shake correction function is set to ON, in step S230, the camera control unit 36 provides a start signal to the angular velocity sensor 24 to detect the amount of camera shake occurring in the electronic camera. Further, shake amount information is input from the angular velocity sensor 24.

  Next, in step S240, the camera control unit 36 calculates the ratio S of the current shake amount to the maximum allowable shake amount allowed for the photographing lens 2 and the correction optical system driving unit 26 read from the performance information storage unit 371. .

  Next, in step S250, the camera control unit 36, based on the current camera shake amount ratio S, the image data of the bar graph 55 corresponding to the ratio S to be displayed in the bar graph display area 52 of the display screen 50 (FIG. 7). And the image data is output to the display processing unit 32, whereby the bar graph 55 is displayed on the display screen 50 of the display monitor 4. The level 53 of the bar graph 55 generated by the camera control unit 36 can be calculated by multiplying the y-coordinate value of the bar graph display area 52 of the display screen 50 (FIG. 7) by the ratio S.

  Next, in step S260, the camera control unit 36 calculates the shutter speed, ISO sensitivity, and f value corresponding to the current camera shake amount. Here, the relationship between the camera shake amount and the shutter speed will be described.

  If the time during which the shutter of the electronic camera is open (shutter speed) is short, an image can be captured from the image sensor 22 before camera shake, so that an image that does not shake can be recorded. Therefore, the minimum value of the shutter speed at which a non-shake image can be recorded with respect to the camera shake amount is stored in the internal table of the camera control unit 36. First, the camera control unit 36 first sets the minimum shutter speed with respect to the camera shake amount. The value is read from the internal table to obtain the shutter speed, and then the ISO sensitivity and f value corresponding to the shutter speed are obtained with reference to the multi-program diagram.

  Here, the multi-program diagram stored in the performance information storage unit 371 will be described with reference to FIG.

  The vertical axis of the multi-program chart indicates the f value (aperture value) of the photographing lens 2, the horizontal axis indicates the shutter speed, and the diagonal line in the figure indicates the EV (Exposure Value) value. If the brightness of the subject is simply considered, it means that the smaller the EV value is, the darker the brightness is, and the brighter the EV value is. That is, the upper left in FIG. 6 indicates the darkest subject, and the bright subject whose EV value increases as it moves to the lower right.

  The EV value = 0 means the brightness of the subject that is properly exposed when the f value = 1 and the shutter speed = 1 second. In FIG. 6, the EV value increases or decreases by 1 each time the f value or the shutter speed is increased or decreased by one step.

  For example, if the f value = 1 is changed to the f value = 1.4 and the shutter speed = 1 second is set to 1/2 second, that is, if the f value and the shutter speed are increased by one step, the EV value = 0 + 1 + 1 = 2. It becomes. For example, in the case of an ISO100 film, the EV value = 15 in sunny daylight, the EV value = 12 in cloudy weather, the EV value = 7 in a room with sunlight, and the EV value = 5 in a room with artificial lighting. .

  The ISO sensitivity is assumed to be ISO sensitivity = 100 in FIG. When the ISO sensitivity is doubled, the value obtained by adding +1 to the EV value becomes equivalent. When the ISO sensitivity is increased, the shutter speed can be set faster or the f-value can be reduced, but the noise tends to increase.

  The f value indicates the aperture of the lens, and the smaller the value, the larger the aperture. When the aperture is large, the depth of field of the subject becomes shallow, and an image in which the subject in focus stands out, for example, a portrait-like image is obtained. On the other hand, when the aperture is small, the depth of focus is widened. Exposure is performed by combining the above three parameters according to the imaging situation and subject.

  In an electronic camera, the above three parameters are generally set automatically, but can be set manually according to the user's request. In the case of manual setting, exposure (EV value) is set with three parameters of ISO sensitivity, shutter speed, and F value using a program diagram.

  Returning to FIG. 5, in step S <b> 270, the camera control unit 36 converts the calculated shutter speed, ISO sensitivity, f value, and other text codes related to the shooting conditions, and further converts the text code to the text image to be applied. The text image is output to the display processing unit 32. As a result, the text image related to the imaging condition is displayed on the display screen 50 of the display monitor 4 from the display processing unit 32 so as to be superimposed on the through image.

  Next, in step S280, the camera control unit 36 sets the shooting conditions such as the shutter speed and ISO sensitivity when the f value in the zoom range of the shooting lens 2 read from the performance information storage unit 371 is changed. Calculation is performed with reference to the multi-program diagram read from the information storage unit 371.

  Next, in step S290, the camera control unit 36 converts the shutter speed and ISO sensitivity when the f value is changed into a text code, and further converts the text code into a text image to be applied. Is output to the display processing unit 32. As a result, as shown in FIG. 7, the set of imaging conditions is displayed superimposed on the through image in the sub display area 58 of the display screen 50 of the display monitor 4.

  In FIG. 7, when the camera shake amount is level 53 indicated by the bar graph 55, it is shown that photographing with the electronic camera is performed with “ISO: 200” and “shutter: 1/400” as photographing conditions. Yes.

  A bar graph 55 shown in FIG. 7 indicates that the longer the amount of camera shake, the longer the graph. In order to obtain the same exposure when the f value = 2.7, a combination of shooting conditions of ISO sensitivity and shutter speed is displayed. I am doing so.

  Here, in step S295, the camera control unit 36 determines whether or not a predetermined time has elapsed using a timer provided therein, and if the predetermined time has not elapsed, the process returns to step S290 and the predetermined time has elapsed. If so, the process returns to step S230.

  As described above, when the electronic camera is set to the through image display mode and the camera shake correction function key is set to ON, the camera shake level is displayed as a bar graph, and is optimal for shooting with the current camera shake amount. The photographing conditions indicating the quality relating to the image recording such as the shutter speed, ISO sensitivity, and F value can be displayed in advance prior to photographing. For this reason, the user can visually recognize the information of the imaging condition corresponding to the shake amount displayed graphically, and by holding the electronic camera so that the ISO sensitivity corresponding to the bar graph of the shake amount is lowered, the ISO It is possible to prepare for recording an image with less noise by lowering the sensitivity and slowing down the shutter speed. At this time, since the amount of camera shake is detected and the bar graph indicating the amount of camera shake is changed in real time, an image with less noise can be recorded while visually recognizing the bar graph.

  Further, the shutter speed value changes depending on the EV value of the subject. Further, when the f value is changed, as shown in FIG. 7, the combination of the shooting conditions of the ISO sensitivity and the shutter speed corresponding to the changed f value is displayed in the sub display area 58. Another corresponding shooting condition can be referred to in advance prior to shooting.

Second Embodiment FIG. 8 is a flowchart showing a schematic operation of an electronic camera which is a second embodiment of the imaging apparatus according to the present invention. This flowchart is for explaining a main program of the electronic camera. It is. The flowchart shown in FIG. 8 is characterized in that steps S340 to S360 are incorporated between steps S50 and S60 with respect to the flowchart shown in FIG. 3, so that the characteristic part of the second embodiment will be described below. Only the description is omitted, and the description of the same parts as those of the first embodiment is omitted.

  In step S50 shown in FIG. 8, the camera control unit 36 checks whether or not a half-press operation of the shutter key 8 has been started based on a signal from the operation unit 35. When the half-press operation of the shutter key 8 is started, the process proceeds to step S60.

  In step S340, the noise amount estimation processing unit 27 provided in the camera control unit 36 reads the f value (performance information) specific to the photographing lens 2 read from the performance information storage unit 371 and the ISO sensitivity specific to the image sensor 22. (Performance information) and the current amount of camera shake input from the angular velocity sensor 24, referring to a table stored in the performance information storage unit 372, the noise amount corresponding to the performance information and the amount of camera shake. This is estimated by reading the value n (0 <n <1).

  In other words, the relationship of noise to individual parameters is as follows: an inverse proportional relationship in which the noise decreases as the ISO sensitivity increases, an inverse proportional relationship in which the noise increases as the shutter speed increases, an inverse proportional relationship in which the noise decreases as the f value increases, and the amount of camera shake. As the value increases, the noise tends to increase. By storing a table showing this relationship in a specific numerical value in the performance information storage unit 372, on the contrary, based on the ISO sensitivity, shutter speed, f value, and camera shake amount, the performance information storage unit 372 generates noise. This is estimated by reading the value n (0 <n <1) of the quantity.

  Next, in step S350, the noise amount estimation processing unit 27 provided in the camera control unit 36 multiplies the white noise image data by the noise amount value n estimated in step S340, thereby obtaining the noise amount value n. Is converted into a noise image corresponding to.

  Next, in step S360, the camera control unit 36 outputs, to the image sensor 22, an area address in a range that can be specified by a small area in the address (x, y) assigned to the pixel plane of the image sensor 22. When the color components of the image data obtained from the area address obtained from the image processing unit 31 are uniform, the area address and the sensitivity amplification control value (noise amount value n) are output to the signal processing unit 30. The sensitivity of the image area designated by this area address is increased according to the sensitivity amplification control value. As a result, the sensitivity of the image area in which the color component of the image data is uniform increases, so that the noise of the image in which the color component of the image data is uniform is enlarged and further displayed from the display processing unit 32. The noise component can be relatively increased only for the image of the region output to the monitor 4. As a result, an image (noise image) processed so that the noise component is increased by the signal processing unit 30 is displayed in association with the region to be processed, and it is easy for the user to visually recognize the amount of noise generated by camera shake. .

  In step S360, the noise amount estimation processing unit 27 provided in the camera control unit 36 includes an address of a uniform color component in the through image currently processed in the image processing unit 31, and Image data may be extracted, and the result of multiplying the image data of that area by the noise image converted in step S350 may be output to the display processing unit 32 by designating the address of this area. As a result, the image (noise image) processed so that the noise component is increased by the display processing unit 32 is displayed in association with the region to be processed, and the amount of noise added to the region is visually recognized and reduced.

  As a result, as shown in FIG. 9, when a region having a uniform color component in the screen of the display monitor 4 is defined as a region 61, the region 61 is enclosed in a rectangle and displayed in a differentiated manner, and the region 61 is displayed as a noise image. The converted data is displayed in the noise display area 62.

  As described above, when the electronic camera is set to the through image display mode and the camera shake correction function key is set to ON, the ISO sensitivity, shutter speed, f value, and camera shake amount that can be currently set for the electronic camera are set. The estimated noise image can be displayed on the display screen prior to recording. For this reason, the user can visually recognize the noise image displayed graphically, and as a result, the electronic camera is gripped so that the amount of noise in the noise image is low, so that it is possible to prepare for recording an image with less noise.

  In the present embodiment, the case where the present invention is applied to an electronic camera has been described in detail. However, the present invention is not limited to this, and it is needless to say that the present invention can be applied to any electronic device including an image sensor.

1A and 1B are a front view (FIG. 1A) and a rear view (FIG. 1B) showing an appearance of an electronic camera that is a first embodiment of an imaging apparatus according to the present invention. It is a block diagram for demonstrating the structure of the electronic camera of the 1st Embodiment of this invention. It is a flowchart which shows schematic operation | movement of the electronic camera of this invention. 3 is a flowchart for explaining camera shake control processing of the electronic camera that is the first embodiment of the imaging apparatus according to the present invention; It is a flowchart for demonstrating the through image display process of the electronic camera which is 1st Embodiment of the imaging device which concerns on this invention. It is a figure which shows a multiprogram diagram. It is a figure which shows the imaging condition added on the screen at the time of the through image display process of the electronic camera which is 1st Embodiment of the imaging device which concerns on this invention. It is a flowchart which shows schematic operation | movement of the electronic camera which is 2nd Embodiment of the imaging device which concerns on this invention. It is a figure which shows the imaging condition added on the screen at the time of the through image display process of the electronic camera which is 2nd Embodiment of the imaging device which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 4 ... Display monitor, 21 ... Correction optical system, 22 ... Imaging device, 24 ... Angular velocity sensor, 25 ... Optical shake correction processing part, 26 ... Correction optical system drive part, 29 ... Timing generation part, 30 ... Signal processing part, 31 ... Image processing unit, 32 ... Display processing unit, 34 ... Recording unit, 35 ... Operation unit, 36 ... Camera control unit, 37 ... Device information storage unit

Claims (8)

Imaging means;
An imaging condition storage means that stores a plurality of types of imaging conditions capable of recording an image that does not shake relative to the camera shake amount in association with the camera shake amount;
Display means;
Detection means for detecting the amount of camera shake;
A ratio calculating means for calculating a ratio of the amount of camera shake detected by the detecting means with respect to a maximum allowable shake amount stored in advance;
Reading means for reading out imaging conditions capable of recording an image that does not shake with respect to the amount of camera shake detected by the detection means from the imaging condition storage means;
A display for controlling the display means to display the photographing conditions read by the reading means in association with the indexed ratio calculated by the ratio calculating means together with the image captured by the imaging means. Control means;
An imaging apparatus comprising:   The imaging apparatus according to claim 1, wherein the photographing condition is a shutter speed when the image is recorded.   The imaging apparatus according to claim 1, wherein the photographing condition is ISO sensitivity information when the image is recorded. Inferring means for estimating the amount of noise when the image is recorded according to the amount of camera shake detected by the detecting means;
Processing means for adding and processing the noise estimated by the estimation means to the image to be captured;
The imaging apparatus according to claim 1, wherein the display control unit further displays an image processed by the processing unit on the display unit. Further comprising selection means for selecting a region of uniform color from the captured image;
The imaging apparatus according to claim 4, wherein the processing unit performs processing by adding noise to the region selected by the selection unit.   The imaging apparatus according to claim 4, wherein the display control unit controls to display the image processed by the processing unit in association with the region to be processed. A detection step for detecting a shake amount ;
A ratio calculating step for calculating a ratio of the camera shake amount detected in the detection step with respect to the maximum allowable shake amount stored in advance;
An image that does not shake with respect to the amount of camera shake detected in the detection step is stored from a storage unit that stores a plurality of types of shooting conditions that can be recorded in advance in association with the amount of camera shake. A reading step for reading out the photographing conditions that can be recorded;
Control is performed so that the shooting conditions read in the reading step are displayed on the display unit in association with the index calculated in the ratio calculation step together with the image captured by the imaging unit. Display control step and
An imaging method comprising : A computer included in an imaging apparatus including a display unit ,
Detection means for detecting the amount of camera shake ;
A ratio calculating means for calculating the ratio of the amount of camera shake detected by the detecting means to the maximum allowable shake amount stored in advance;
An image that does not shake with respect to the amount of camera shake detected by the detecting means is recorded from a storage unit that stores a plurality of types of photographing conditions that can be recorded in advance in association with the amount of camera shake. Reading means for reading imaging conditions that can be performed;
Display control means for controlling the image capturing condition read by the reading means together with the imaged image to be displayed on the display unit in association with an index of the ratio calculated by the ratio calculating means;
An imaging program that functions as a computer program.

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