US20030122952A1 - Electronic camera for producing quickview images - Google Patents

Electronic camera for producing quickview images Download PDF

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Publication number
US20030122952A1
US20030122952A1 US10/320,661 US32066102A US2003122952A1 US 20030122952 A1 US20030122952 A1 US 20030122952A1 US 32066102 A US32066102 A US 32066102A US 2003122952 A1 US2003122952 A1 US 2003122952A1
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Prior art keywords
image
quickview
image data
record
data
Prior art date
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Abandoned
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US10/320,661
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English (en)
Inventor
Toshihisa Kuroiwa
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Nikon Corp
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Nikon Corp
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Assigned to NIKON CORPORATION reassignment NIKON CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KUROIWA, TOSHIHISA
Publication of US20030122952A1 publication Critical patent/US20030122952A1/en
Priority to US11/882,521 priority Critical patent/US20070268391A1/en
Priority to US12/805,558 priority patent/US20100309360A1/en
Priority to US13/605,572 priority patent/US8908079B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/21—Intermediate information storage
    • H04N1/2104—Intermediate information storage for one or a few pictures
    • H04N1/2112—Intermediate information storage for one or a few pictures using still video cameras
    • H04N1/2137—Intermediate information storage for one or a few pictures using still video cameras with temporary storage before final recording, e.g. in a frame buffer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/21—Intermediate information storage
    • H04N1/2104—Intermediate information storage for one or a few pictures
    • H04N1/2112—Intermediate information storage for one or a few pictures using still video cameras
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/63—Control of cameras or camera modules by using electronic viewfinders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/10—Circuitry of solid-state image sensors [SSIS]; Control thereof for transforming different wavelengths into image signals
    • H04N25/11—Arrangement of colour filter arrays [CFA]; Filter mosaics
    • H04N25/13—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2101/00—Still video cameras
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/0077—Types of the still picture apparatus
    • H04N2201/0084—Digital still camera

Definitions

  • the present invention relates to an electronic camera that internally processes image data obtained by picking up subject images. More particularly, the present invention relates to an electronic camera that produces image data for record to be recorded on a recording medium and quickview images for monitor display.
  • An electronic camera reads image data from its internal image sensor.
  • the electronic camera implements signal processings on the image data, such as A/D conversion, defective pixel correction, optical black-level correction, gain adjustment, white balance adjustment, tone correction and so on.
  • the signal-processed image data are stored in a buffer memory within the electronic camera.
  • the electronic camera implements image processings on the signal-processed image data, such as color interpolation, color coordinate transformation, color correction, special frequency filtering and so on, and thereby produce image data for record.
  • the electronic camera reduces the image size of the image data for record to produce a quickview image.
  • the electronic camera reduces the image size of the image data for record to generate a thumbnail image for a display list.
  • the electronic camera compresses the thumbnail image by use of a hardware or software processing.
  • the electronic camera implements file recording of the image-compressed resultants on a recording medium.
  • the inventor of the present invention recognizes the following problems existent in the above-described processings.
  • a user or operator of the electronic camera displays a quickview image on its monitor screen after capturing a subject image. He or she may use this quickview image on the photo-taking spot to determine whether the captured result is good or not. It is preferable that the user or operator can check the quickview without delay at the time of photographing. It is, therefore, desirable that the quickview image be produced as soon as possible after the capturing of the subject image.
  • the electronic camera must additionally compress and recode the quickview image after completing the image compression of preceding image data for record. This elongates the time required for photographing by a time needed for performing the additional processings accordingly. Consequently, disadvantages such as a reduction in the speed of a continuous shooting are likely to arise.
  • An electronic camera includes: an image pickup part for picking up a subject image to produce image data; a processing part for processing the image data outputted from the image pickup part to produce a quickview image and image data for record, the quickview image being used for monitor display, the image data for record being to be recorded on a recording medium; and a monitor part for displaying the quickview image.
  • the processing part commences displaying the quickview image on the monitor part before the production of the image data for record is completed.
  • the display of the quickview image is commenced before the image data for record is generated.
  • the quickview image can be quickly displayed without waiting for the completion of production of the image data for record.
  • the time lag occurring at displaying the quickview image can be reduced, so that the user can review the captured image significantly smoothly.
  • the processing part of the electronic camera according to the present invention includes an image processing part and a quickview producing part.
  • the image processing part image-processes the image data to produce the image data for record.
  • the quickview producing part upon receiving the image data outputted from the image pickup part, reduces the number of the pixels of the image data to produce the quickview image, and then commences the display of the quickview image before the image data for record is produced.
  • the quickview image is produced from the output of the image pickup part.
  • the production processing of the quickview image is almost irreverent of the image processing of the image data for record. This lessens the time loss occurring due to the processings on the image data for record, thereby enabling quick production of the quickview image.
  • the time lag occurring at displaying the quickview image can be reduced, so that the user can check the captured image significantly smoothly.
  • the processing part of the electronic camera according to the present invention includes a buffer part, a reducing part and an image processing part.
  • the buffer part temporarily stores the image data outputted from the image pickup part.
  • the reducing part reduces the number of the pixels of the image data to produce slimmed-down intermediate data (which will be referred to simply as “intermediate data” hereinafter).
  • the image processing part firstly image-processes the intermediate data to produce the quickview image and thereafter image-processes the image data temporarily stored in the buffer part to produce the image data for record.
  • the slimmed-down intermediate data are produced first in this processing.
  • the image processing part preferentially image-processes the intermediate data, thereby producing the quickview image.
  • the intermediate image can be produced at a high speed because it is produced by a relatively simple processing such as reducing the pixel number.
  • the production of the quickview image from the intermediate image can be completed at a high speed because the number of the pixels of the intermediate image to be processed is small. As a result, the time lag occurring at displaying the quickview image can be decreased, so that the user can review the captured image significantly smoothly.
  • the reducing part produces the intermediate image
  • the number of the pixels which the image processing part processes for production of the quickview image is small, resulting in substantially lessening the amount of the processings by the image processing part.
  • the image processing part has a margin to perform other processings in addition to the production processing of the quickview image. This margin of the image processing part is efficiently utilized. By utilizing this margin, the image processing part produces the image data for record after producing the quickview image. This eliminates the need to provide any independent image processing parts dedicated to the quickview images and to the image data for record, thereby simplifying the structure of the electronic camera.
  • the electronic camera according to the present invention further includes an image compressing part and a recording part.
  • the image compressing part first image-compresses the quickview image and the image data for record next to produce their respective compressed data.
  • the recording part first records the compressed data of the quickview image and the compressed data of the image data for record next.
  • the quickview image and image data for record are compressed and recorded in the same order which is the quickview image first, the image data for record second.
  • the electronic camera according to the present invention changes the processings on the image data in the following manner when the image pickup part continuously picks up the subject image to produce a plurality of sets of image data. That is, the buffer part temporarily stores the plurality of sets of image data in order in which the sets of image data are outputted from the image pickup part.
  • the image processing part reads the image data temporarily stored in the buffer part and produces image data for record. Then, the reducing part reduces the number of the pixels of the image data for record to produce quickview images.
  • each set of image data for record is produced with priority to a respective quickview image.
  • Each quickview image is produced by reducing the number of the pixels of a respective set of image data for record.
  • the buffer part can release the corresponding memory space. This increases the usage efficiency of the buffer part, by which further increases the number of the frames to be continuously shot at one time.
  • the memory capacity required for the buffer part may be reduced.
  • each quickview image is produced later than its respective set of image data for record.
  • the user scarcely checks the quickview images so that the delay in producing the quickview images causes no significant problems.
  • the production of the quickview images may be omitted, or the quickview images may be compressed or recorded after the continuous shooting. In such a case, it is possible to shorten the time required to process the image data of each frame, which makes it easier to increase the speed of the continuous shooting.
  • the electronic camera according to the present invention further includes an image compressing part for image-compressing the quickview images and the image data for record.
  • an image compressing part for image-compressing the quickview images and the image data for record.
  • the quickview images which are sequentially generated by the continuous shooting, are temporarily stored in the buffer part.
  • the image compressing part receives the quickview images from the buffer part to implement image compression thereon. Therefore, in a case where the image compressing part alone performs most of data processings such as in the continuous shooting mode, the quickview images may be compressed at appropriate times (by utilizing, for example, free times of the image compressing part).
  • the quickview images are relatively small in content, and hence occupy small regions of the buffer part.
  • the regions of the buffer part are less occupied when compression is performed at appropriate times than when a processing sequence where image data for record are stored in the buffer is performed. This results in easily securing extraneous regions of the buffer part for the buffering in the continuous shooting mode, and in increasing the possible number of frames to be continuously shot.
  • the electronic camera according to the present invention includes an image compressing part for image-compressing the image data for record to produce compressed data thereof and a recording part for recording the compressed data of the image data for record.
  • the image pickup part continuously picks up the subject image to produce a plurality of sets of image data
  • the electronic camera implements processings as follows. That is, the buffer part temporarily stores the compressed data of the image data for record which are successively produced by the image compressing part.
  • the recording part receives the compressed data of the image data for record from the buffer part and records them.
  • the compressed data of the image data for record are temporarily stored in the buffer part.
  • the recording part Upon receiving the compressed data of the image data for record from the buffer part, the recording part records them. Therefore, in a case where the image compressing part alone performs most of data processings such as in the continuous shooting mode, the quickview images may be compressed at appropriate times (by utilizing, for example, free times of the recording part).
  • the regions of the buffer part are less occupied when compression is performed at appropriate times than when a processing sequence where not-yet-compressed image data for record are stored in the buffer is performed. This results in easily securing extraneous regions of the buffer part for the buffering in the continuous shooting mode, and in increasing the possible number of frames to be continuously shot.
  • the foregoing processing part of the electronic camera according to the present invention further reduces the number of the pixels of the quickview image to produce a thumbnail image for a display list.
  • the pixels of the quickview image are reduced in number to produce the thumbnail image for the display list.
  • processing slimmed-down quickview images realizes quick creation of so that the thumbnail image.
  • the image compression of the thumbnail image be performed by using image compressing means that is different from the image compressing part (for example, by software compression using an internal microprocessor or the like). This allows the image compression of the thumbnail image to be implemented without interfering with the image compressions of the image data for record and of the quickview image.
  • FIG. 1 is a block diagram showing the structure of an electronic camera 1 according to a first embodiment of the present invention.
  • FIG. 2 is a timing chart showing operations of the electronic camera 1 .
  • FIG. 3 is a block diagram showing the structure of an electronic camera 11 according to a second embodiment of the present invention.
  • FIG. 4 is a diagram showing signal processing paths of the electronic camera 11 in a single shooting mode.
  • FIG. 5 is a timing chart of the electronic camera 11 in the single shooting mode.
  • FIG. 6 is a diagram showing signal processing paths of the electronic camera 11 in a continuous shooting mode.
  • FIG. 7 is a timing chart of the electronic camera 11 in the continuous shooting mode.
  • FIG. 1 is a block diagram showing the structure of an electronic camera 1 according to a first embodiment of the present invention. The structure of the electronic camera 1 will be described below with reference to FIG. 1.
  • the electronic camera 1 has lenses 2 mounted thereon, and also has an image sensor 3 whose image plane is located in the image space of the lenses 2 .
  • An output of the image sensor 3 is supplied through an A/D converting part 4 to a signal processing part 5 , an output of which is supplied to an image processing part 6 and also supplied to a quickview producing part 7 .
  • the image processing part 6 implements image processings on the output supplied from the signal processing part 5 to produce image data for record, which are then supplied to an image compressing part 8 .
  • the quickview producing part 7 produces a quickview image based on the output supplied from the signal processing part 5 .
  • the quickview image is supplied to the image compressing part 8 , and also supplied to a monitor display part 7 a and displayed thereon for monitoring.
  • the quickview producing part 7 also produces a thumbnail image that is small in image size.
  • the thumbnail image is outputted to a thumbnail compressing part 9 .
  • the image compressing part 8 image-compresses the quickview image first and image data for record next to output their respective compressed data to a recording part 10 .
  • the thumbnail compressing part 9 implements image compression of the thumbnail image to output the compressed data thereof to the recording part 10 .
  • the recording part 10 records these compressed data onto a recording medium such as a memory card or the like.
  • the image pickup part recited in the Claims corresponds to the image sensor 3 , A/D converting part 4 and signal processing part 5 .
  • the processing part recited in the Claims corresponds to the image processing part 6 and quickview producing part 7 .
  • the monitor part recited in the Claims corresponds to the monitor display part 7 a.
  • the image processing part recited in the Claims corresponds to the image processing part 6 .
  • the quickview producing part recited in the Claims corresponds to the quickview producing part 7 .
  • the image compressing part recited in the Claims corresponds to the image compressing part 8 .
  • the recording part recited in the Claims corresponds to the recording part 10 .
  • FIG. 2 is a timing chart showing operations of the electronic camera 1 .
  • the lenses 2 focus a subject image onto the image plane of the image sensor 3 .
  • the image plane of the image sensor 3 includes a color filter array of a Bayer pattern or the like, which provides optical color separation of the subject image.
  • the image sensor 3 implements photoelectric conversion of the thus separated color components (RGB or the like) pixel by pixel, and stores them as signal charges.
  • the image sensor 3 stores the signal charges for a predetermined exposure time period under a known electronic shutter control or with a mechanical shutter. Thereafter, the image sensor 3 outputs an image signal in accordance with a driving pulse supplied from a timing generator (not shown).
  • the A/D converting part 4 A/D converts the image signal in real time to output digital image data.
  • the digital converted image data are inputted to the signal processing part 5 , which executes processings on the image data in real time, such as defective pixel correction, optical black-level correction, gain correction, white balance correction, gamma correction and so on.
  • the image processing part 6 sequentially receives the real-time-processed image data from the signal processing part 5 , and implements image processings on the image data, such as color interpolation processing, color correction processing, filter processing and so on, thereby producing image data for record.
  • image processings on the image data such as color interpolation processing, color correction processing, filter processing and so on, thereby producing image data for record.
  • the image data for record are temporarily stored in an image memory (not shown) within the image processing part 6 .
  • the quickview producing part 7 sequentially receives the real-time-processed image data from the signal processing part 5 .
  • the quickview producing part 7 equally partitions the pixel pattern of the image data in accordance with the numbers of the vertical and horizontal pixels of a quickview image to be produced, thereby providing pixel blocks that are equal in number to the pixels of the quickview image.
  • the quickview producing part 7 averages each sort of color components in each of the pixel blocks to provide the signal components of the quickview image.
  • the monitor display part 7 a displays the quickview image for monitoring. A user or operator can quickly review the last picked-up or captured image by viewing this monitor display.
  • a quickview image may be produced by thinning out the image data.
  • the quickview producing part 7 thins out the pixels of the produced quickview image, thereby further reducing the image size to produce a thumbnail image for a display list.
  • the thumbnail compressing part 9 receives the thumbnail image from the quickview producing part 7 and implements image compression thereof.
  • the small compressed data are temporality held within the thumbnail compressing part 9 and outputted to the recording part 10 at a time when the recording part 10 is ready for recording.
  • the image compressing part 8 receives the quickview image from the quickview producing part 7 and implements image compression thereof.
  • the recording part 10 receives the compressed data of the quickview image from the image compressing part 8 and sequentially records them.
  • the image compressing part 8 receives, after completing the image compression of the quickview image, the image data for record from the image processing part 6 , and implements image compression thereof.
  • the recording part 10 receives, after completing the recording of the compressed data of the quickview images, the compressed data of the thumbnail images from the thumbnail compressing part 9 , and records them in sequence.
  • the recording part 10 receives, after completing the recording of the compressed data of the thumbnail image, the compressed data of the image data for record from the image compressing part 8 , and sequentially records them.
  • the outputting of the quickview image is commenced prior to that of the image data for record. Therefore, the quickview image can be quickly displayed, so that the user can review the captured image quite smoothly.
  • the quickview producing part 7 directly receives the image data from the signal processing part 5 to produce the quickview image. This allows the production of the quickview image to be commenced quickly without waiting for a completion of the time-consuming processings implemented by the image processing part 6 . As a result, the time lag occurring at displaying the quickview image can be significantly reduced.
  • the production of the quickview image and that of the image data for record are performed in parallel.
  • the production of the image data for record does not delay since the production of the image data for record starts nearly at the same time as that of the quickview image.
  • the outputting of the quickview image and that of the image data for record are commenced in the order named.
  • the image compressing part 8 implements image compressions on them in this order. This allows the image compression of the quickview image to advance to some degree in parallel with the production of the image data for record, so that the whole processing time can be efficiently shortened.
  • the compressed data of the quickview image and that of the image data for record are produced in the order named.
  • the recording part 10 implements the recordings of the compressed data in this order. This allows the recording of the compressed data of the quickview image to advance to some degree in parallel with the production of the image data for record, so that the whole processing time can be efficiently shortened.
  • the quickview image is processed to produce the thumbnail image.
  • the slimmed-down quickview image needs to be processed, which enables quick production of the thumbnail image through a simple processing.
  • FIG. 3 is a block diagram showing the structure of an electronic camera 11 according to a second embodiment.
  • FIG. 3 shows a control IC 99 surrounded with dashed lines.
  • the signal processing system of the electronic camera 11 is constituted of the control IC 99 and peripheral components.
  • the electronic camera 11 has a lens 12 mounted thereon, and also has an image sensor 13 whose image plane is located in the image space of the lens 12 .
  • Image data outputted from the image sensor 13 are supplied to an A/D converting part 14 to be digitalized thereby.
  • the digitalized image data are then inputted to a signal processing engine 99 a.
  • the signal processing engine 99 a is constituted of processing blocks a signal processing part 15 , a thinning part 16 , an image processing part 17 , a resolution converting part 18 , an image compressing part 19 and so on. These processing blocks 15 through 19 are connected with one another via direct signal paths and via a picture bus 20 .
  • a video controller 31 , a video encoder 32 and so on are also connected to the picture bus 20 via a FIFO 30 .
  • a video signal outputted from the video encoder 32 is displayed on a liquid crystal monitor 32 a provided on the back surface of the electronic camera 11 .
  • the picture bus 20 is also connected to a system bus 24 and to an external bus 25 via bus interfaces 21 and 22 that switch bus connections. These bus interfaces 21 and 22 are controlled by a microprocessor 50 that will be described later.
  • the external bus 25 is connected to external components: a SDRAM (synchronous DRAM) 26 , a ROM 27 , an I/O device 28 and so on.
  • a SDRAM controller 26 a is provided in the control IC 99 .
  • a DMA controller 26 b is also provided in the control IC 99 .
  • the system bus 24 is connected to a serial port 41 , a USB (Universal Serial Bus) 42 and a card interface 43 .
  • Port terminals of the serial port 41 are extended to the exterior to the control IC 99 and connected to an audio LSI 45 , a timing generator 44 that drives the image sensor 13 , and so on.
  • a terminal of the USB 42 is also extended to the exterior to the control IC 99 and may be connected to an external host computer 46 if necessary.
  • the card interface 43 writes data into a memory card 47 for data storage.
  • the control IC 99 also incorporates the microprocessor 50 for system control.
  • the microprocessor 50 is constituted of a data cache 51 , a RISC (Reduced Instruction Set Computer) core 52 that is an instruction executing unit, and an instruction cache 53 .
  • RISC Reduced Instruction Set Computer
  • the image pickup part recited in the Claims corresponds to the image sensor 13 , A/D converting part 14 and signal processing part 15 .
  • the processing part recited in the Claims corresponds to the thinning part 16 , image processing part 17 , resolution converting part 18 , image compressing part 19 , video controller 31 and microprocessor 50 .
  • the monitor part recited in the Claims corresponds to the liquid crystal monitor 32 a.
  • the buffer part recited in the Claims corresponds to the SDRAM 26 .
  • the reducing part recited in the Claims corresponds to the thinning part 16 and resolution converting part 18 .
  • the image processing part recited in the Claims corresponds to the image processing part 17 .
  • the image compressing part recited in the Claims corresponds to the image compressing part 19 .
  • the recording part recited in the Claims corresponds to the card interface 43 and microprocessor 50 .
  • the electronic camera 11 described above has two shooting modes: a single shooting mode and a continuous shooting mode. An operation of the single shooting mode will be explained below first.
  • FIG. 4 is a diagram showing signal processing paths of the electronic camera 11 in the single shooting mode.
  • FIG. 5 is a timing chart of the electronic camera 11 in the single shooting mode.
  • the image plane of the image sensor 13 includes a color filter array of a Bayer pattern or the like.
  • the image sensor 13 performs, pixel by pixel, photoelectric conversion on color-separated lights through the color filter array, and stores them as signal charges.
  • the image sensor 13 stores the signal charges for a predetermined exposure time period, and thereafter outputs an image signal in accordance with a driving pulse supplied from the timing generator 44 .
  • the A/D converting part 14 A/D converts the image signal in real time to output digital image data.
  • the digital-converted image data are inputted to the signal processing part 15 , which performing processings on those image data-in real time, such as defective pixel correction, optical black-level (OB) correction, gain adjustment, white balance (WB) adjustment, gamma correction and so on.
  • processings on those image data-in real time such as defective pixel correction, optical black-level (OB) correction, gain adjustment, white balance (WB) adjustment, gamma correction and so on.
  • the image data outputted in real time from the signal processing part 15 are supplied to the thinning part 16 , while they are temporarily stored in the SDRAM 26 via the picture bus 20 and external bus 25 .
  • the thinning part 16 sequentially receives image data outputted in real time by the signal processing part 15 .
  • the thinning part 16 implements pixel number reduction (pixel thinning, pixel averaging or the like) on the image data to produce intermediate data in which the pixels have been reduced in number.
  • the intermediate data be subjected to a color interpolation equivalent to the color interpolation of image data for record that will be described later. Therefore, the thinning part 16 of the present embodiment implements pixel number reduction such that the color pattern of the image data and that of the intermediate data will coincide with each other.
  • the image data of the first field are temporarily stored in the SDRAM 26 , and subsequently the image data of the second field are outputted from the signal processing part 15 .
  • the thinning part 16 preferably implements pixel number reduction each time a predetermined unit of data becomes available for the pixel number reduction.
  • the image processing part 17 sequentially receives the intermediate data from the thinning part 16 .
  • the image processing part 17 sequentially implements the color interpolation processing, color correction processing and filter processing on the intermediate data.
  • the resolution converting part 18 receives the intermediate data image-processed by the image processing part 17 .
  • the resolution converting part 18 implements resolution conversion of the image-processed intermediate data to produce a quickview Image that has been adjusted in image size in accordance with the monitor resolution.
  • the video controller 31 uses the SDRAM 26 or the like as a video memory to cause the quickview Image to be monitor-displayed. The user may view this monitor display to quickly review the last captured image.
  • the resolution converting part 18 reduces the number of the pixels of the produced quickview image to produce a thumbnail image for a display list.
  • the microprocessor 50 receives the thumbnail image from the resolution converting part 18 to implement compression of the thumbnail image based on a software processing.
  • the compressed data of the thumbnail image are transferred to the SDRAM 26 to be temporarily stored therein.
  • the microprocessor 50 may use the SDRAM 26 as an input buffer to receive the thumbnail image.
  • the microprocessor 50 may receive the thumbnail image from the SDRAM 26 to implement the compression thereon independently of the timing at which the thumbnail image is produced by the resolution converting part 18 .
  • the microprocessor 50 may efficiently implement the compression on the thumbnail image, for example, during an interval between system controls such as switch monitoring and the like.
  • the image compressing part 19 receives the quickview Image from the resolution converting part 18 to implement the image compression thereof.
  • the image compressing part 19 transfers the compressed data of the quickview Image to the SDRAM 26 , which temporarily stores them therein.
  • the microprocessor 50 (or DMA controller 26 b ) derives the compressed data of the quickview image from the SDRAM 26 , and transfers them to the card interface 43 to sequentially record them in the memory card 47 .
  • the microprocessor 50 (or DMA controller 26 b ) derives the compressed data of the thumbnail image from the SDRAM 26 , and transfers them to the card interface 43 , which sequentially records them in the memory card 47 .
  • the image processing part 17 After completing the image processings on the intermediate data, the image processing part 17 reads the image data buffer-stored in the SDRAM 26 . The image processing part 17 then implements image processings on the image data, such as color interpolation processing, color correction processing, filter processing and so on, to produce the image data for record.
  • image processings on the image data such as color interpolation processing, color correction processing, filter processing and so on
  • the image compressing part 19 receives the image data for record from the image processing part 17 to implement image compression thereof.
  • the image compressing part 19 transfers the compressed data of the image data for record to the SDRAM 26 , which temporarily stores them therein.
  • the microprocessor 50 (or DMA controller 26 b ) derives the compressed data of the image data for record from the SDRAM 26 , and transfers them to the card interface 43 to sequentially record them in the memory card 47 .
  • FIG. 6 is a diagram showing signal processing paths of the electronic camera 11 in the continuous shooting mode.
  • FIG. 7 is a timing chart of the electronic camera 11 in the continuous shooting mode.
  • the electronic camera 11 With its shutter release button (not shown) being pressed on, the electronic camera 11 continuously exposes and scans/reads the image sensor 13 .
  • the signal processing part 15 implements processings in real time on the data of the images continuously picked up, such as defective pixel correction, optical black-level (OB) correction, gain adjustment, white balance adjustment, gamma correction and so on.
  • processings in real time such as defective pixel correction, optical black-level (OB) correction, gain adjustment, white balance adjustment, gamma correction and so on.
  • OB optical black-level
  • the image data continuously outputted from the signal processing part 15 are supplied through the picture bus 20 and external bus 25 to the SDRAM 26 to be sequentially stored in continuous shooting buffer regions of the SDRAM 26 .
  • the image processing part 17 reads the image data from the continuous shooting buffer regions of the SDRAM 26 in the picking-up order.
  • the image processing part 17 then implements image processings on the image data, such as color interpolation processing, color correction processing, filter processing and so on, to produce the image data for record. It should be noted that in order to increase the number of the frames to be continuously shot at one time, the continuous shooting buffer regions from which the image data have been read for those image processings are immediately released and become usable as the latest continuous shooting buffer regions.
  • the image processing part 17 preferably implements the above described image processings each time a predetermined unit of data becomes available for those image processings.
  • the image sensor 13 may receive the image data directly from the signal processing part 15 as long as the image processing part 17 has no delay in processings.
  • the image compressing part 19 receives the image data for record from the image processing part 17 to implement image compression thereof.
  • the image compressing part 19 transfers the compressed data of the image data for record to the SDRAM 26 , which temporarily stores them therein.
  • the microprocessor 50 (or DMA controller 26 b ) derives the compressed data of the image data for record from the SDRAM 26 , and transfers them to the card interface 43 to sequentially record them in the memory card 47 .
  • the resolution converting part 18 receives the image data for record from the image processing part 17 , and implements resolution conversion of the image data for record to produce a quickview Image, which is then transferred to the SDRAM 26 and temporarily stored in the processing buffer regions thereof.
  • the thinning part 16 receives the quickview image from the resolution converting part 18 , and implements pixel number reduction (pixel thinning, pixel averaging or the like) of the quickview image to produce a thumbnail image for a display list.
  • the microprocessor 50 sequentially receives the thumbnail image from the thinning part 16 to implement image compression thereof based on a software processing.
  • the microprocessor 50 (or DMA controller 26 b ) transfers the compressed data of the thumbnail image to the SDRAM 26 , which temporarily stores them therein.
  • the microprocessor 50 may use the SDRAM 26 as an input buffer to receive the thumbnail image.
  • the microprocessor 50 may receive the thumbnail image from the SDRAM 26 to implement the compression thereof, independently of the timing at which the thumbnail image is produced by the resolution converting part 18 .
  • microprocessor 50 may efficiently implement the compression of the thumbnail image, for example, during an interval between system controls such as a switch monitoring and the like.
  • the image compressing part 19 after completing the image compression of the image data for record, reads the quickview Image from the SDRAM 26 to implement the image compression thereof.
  • the image compressing part 19 transfers the compressed data of the quickview Image to the SDRAM 26 , which temporarily stores them therein.
  • the microprocessor 50 (or DMA controller 26 b ) derives the compressed data of the thumbnail image from the SDRAM 26 , and transfers them to the card interface 43 , which records them in the memory card 47 .
  • the microprocessor 50 (or DMA controller 26 b ) derives the compressed data of the quickview image from the SDRAM 26 , and transfers them to the card interface 43 , which records them in the memory card 47 .
  • the outputting of the quickview image is commenced prior to that of the image data for record. Therefore, the quickview image can be quickly displayed, so that the user can review the captured image quite smoothly.
  • the electronic camera 11 when producing the quickview image, the electronic camera 11 produces first the intermediate data where the number of the pixels has been reduced. As a result, the electronic camera 11 only needs to implement image processings on the slimmed-down intermediate data so as to produce the quickview image. Thus, the quickview image can be quickly completed.
  • the quickview image and the image data for record are generated at different timings from each other. Therefore, using the single image processing part 17 the quickview image and image data for record are smoothly image-processed. This eliminates the necessity for providing separate image processing parts respectively dedicated to the quickview image and the image data for record. As a result, the structure of the electronic camera 11 is simplified.
  • the outputting of the quickview image and that of the image data for record are commenced in the order named.
  • the image compressing part 19 implements image compression on them in this order. Therefore, the quickview image can be compressed to some degree in parallel with the production of the image data for record. As a result, the whole processing time can be efficiently shortened.
  • the compressed data of the quickview image and that of the image data for record are produced in the order named.
  • the card interface 43 records their compressed data in this order. Therefore, while the image data for record are being produced, the recording of the compressed data of the quickview image can be advanced to some degree. As a result, the whole processing time can be efficiently shortened.
  • the image data for record is preferentially generated, and the quickview images are generated by processing the image data for record.
  • the image data for record are generated earlier, whereby the continuous shooting buffer regions of the SDRAM 26 can be released quickly one after another, resulting in increasing the possible number of frames in the continuous shooting.
  • performing the operations (6), (10) and (11) after the continuous shooting can further increase the speed of the continuous shooting because these operations are time-consuming. (This is because the quickview images cannot be compressed during compression of the image data for record so that these three operations are likely to have to be sequential.)
  • the operations (7), (8) and (9) can be implemented concurrently with the compression of the image data for record, performing these operations (7), (8) and (9) for each frame will not significantly reduce the speed of the continuous shooting.
  • the operation (9) be implemented after the completion of the continuous shooting so as not to reduce the speed of the continuous shooting.
  • the processing sequences are different between the single and continuous shootings. Consequently, the quickview image can be quickly displayed at the time of the single shooting, while the speed of the continuous shooting can be increased in the continuous shooting.
  • the present invention is not limited thereto.
  • the above-described processing sequence of the continuous shooting mode may be performed in the single shooting mode.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Television Signal Processing For Recording (AREA)
  • Studio Devices (AREA)
US10/320,661 2001-12-28 2002-12-17 Electronic camera for producing quickview images Abandoned US20030122952A1 (en)

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US11/882,521 US20070268391A1 (en) 2001-12-28 2007-08-02 Electronic camera for producing quickview images
US12/805,558 US20100309360A1 (en) 2001-12-28 2010-08-05 Electronic camera for producing quickview images
US13/605,572 US8908079B2 (en) 2001-12-28 2012-09-06 Electronic camera for producing quickview images

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JP2001400744A JP3988461B2 (ja) 2001-12-28 2001-12-28 電子カメラ
JP2001-400744 2001-12-28

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US11/882,521 Abandoned US20070268391A1 (en) 2001-12-28 2007-08-02 Electronic camera for producing quickview images
US12/805,558 Abandoned US20100309360A1 (en) 2001-12-28 2010-08-05 Electronic camera for producing quickview images
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US13/605,572 Expired - Fee Related US8908079B2 (en) 2001-12-28 2012-09-06 Electronic camera for producing quickview images

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US20120327285A1 (en) 2012-12-27
TW200301649A (en) 2003-07-01
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TW595201B (en) 2004-06-21
US20070268391A1 (en) 2007-11-22

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