US20120236181A1 - Generating a zoomed image - Google Patents

Generating a zoomed image Download PDF

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Publication number
US20120236181A1
US20120236181A1 US13/049,088 US201113049088A US2012236181A1 US 20120236181 A1 US20120236181 A1 US 20120236181A1 US 201113049088 A US201113049088 A US 201113049088A US 2012236181 A1 US2012236181 A1 US 2012236181A1
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United States
Prior art keywords
image data
image
image sensor
zoomed
cropped
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US13/049,088
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English (en)
Inventor
Ying X. Noyes
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Qualcomm Inc
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Qualcomm Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Priority to US13/049,088 priority Critical patent/US20120236181A1/en
Assigned to QUALCOMM INCORPORATED reassignment QUALCOMM INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NOYES, YING X.
Priority to PCT/US2012/029287 priority patent/WO2012125862A1/en
Priority to EP12713454.2A priority patent/EP2687007A1/de
Priority to KR1020137027292A priority patent/KR101532861B1/ko
Priority to JP2013558185A priority patent/JP2014511071A/ja
Priority to CN201280013156.2A priority patent/CN103430532B/zh
Publication of US20120236181A1 publication Critical patent/US20120236181A1/en
Priority to US14/215,792 priority patent/US9325905B2/en
Priority to JP2015204876A priority patent/JP2016042712A/ja
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • 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
    • H04N23/69—Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming
    • 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
    • H04N23/62—Control of parameters via user interfaces
    • 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
    • H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/40—Extracting pixel data from image sensors by controlling scanning circuits, e.g. by modifying the number of pixels sampled or to be sampled
    • H04N25/44—Extracting pixel data from image sensors by controlling scanning circuits, e.g. by modifying the number of pixels sampled or to be sampled by partially reading an SSIS array
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/40—Extracting pixel data from image sensors by controlling scanning circuits, e.g. by modifying the number of pixels sampled or to be sampled
    • H04N25/44—Extracting pixel data from image sensors by controlling scanning circuits, e.g. by modifying the number of pixels sampled or to be sampled by partially reading an SSIS array
    • H04N25/443—Extracting pixel data from image sensors by controlling scanning circuits, e.g. by modifying the number of pixels sampled or to be sampled by partially reading an SSIS array by reading pixels from selected 2D regions of the array, e.g. for windowing or digital zooming

Definitions

  • the present disclosure is generally related to generating a zoomed image.
  • wireless computing devices such as portable wireless telephones, personal digital assistants (PDAs), and paging devices that are small, lightweight, and easily carried by users.
  • portable wireless telephones such as cellular telephones and internet protocol (IP) telephones
  • IP internet protocol
  • wireless telephones can communicate voice and data packets over wireless networks.
  • many such wireless telephones include other types of devices that are incorporated therein.
  • a wireless telephone can also include a digital still camera, a digital video camera, a digital recorder, and an audio file player.
  • such wireless telephones can process executable instructions, including software applications, such as a web browser application, that can be used to access the Internet. As such, these wireless telephones can include significant computing capabilities.
  • Certain portable electronic devices include image sensors to capture images.
  • digital cameras, mobile telephones, digital video cameras, portable computing devices, and so forth may include image sensors. These portable electronic devices may be able to perform zoom operations to provide a larger (or zoomed) view of a portion of an image.
  • optics associated with an image sensor may be changed in order to generate an image at the image sensor that includes more detail of a particular area.
  • a portion of the image data captured by the image sensor may be upscaled in order to extrapolate or interpolate additional pixel data between pixels that are actually captured by the image sensor.
  • Such upscaling processes may increase latency of image processing, may use additional bandwidth, may increase a pixel clock rate to an unacceptable level, may cause other issues with image quality or processing, or any combination thereof.
  • a zoomed image can be generated by sending window information to an image sensor.
  • the window information indicates a portion of the image sensor from which image data is to be output as cropped image data.
  • a pixel clock rate of the image sensor may also be reduced.
  • the cropped image data may be upscaled and processed to generate the zoomed image.
  • a method of generating a zoomed image includes receiving an instruction to perform a zoom operation and sending window information and a pixel rate reduction request to an image sensor based on the instruction.
  • the pixel clock rate reduction request causes a rate at which frames of image data are captured by the image sensor to remain substantially constant or unchanged.
  • the window information corresponds to a portion of the image sensor.
  • the method also includes receiving cropped image data corresponding to the portion from the image sensor and upscaling the cropped image data to generate a zoomed image.
  • an apparatus in another particular embodiment, includes means to send window information to an image sensor in response to an instruction to perform a zoom operation.
  • the window information corresponds to a portion of the image sensor.
  • the apparatus also includes means to receive cropped image data corresponding to the portion and means to upscale the cropped image data to generate a zoomed image.
  • a tangible computer readable medium stores processor-executable instructions that, when executed by a processor, cause the processor to send window information to an image sensor in response to an instruction to perform a zoom operation.
  • the window information corresponds to a portion of the image sensor.
  • the instructions are further executable by the processor to receive cropped image data corresponding to the portion from the image sensor and to upscale the cropped image data to generate a zoomed image.
  • a method in another particular embodiment, includes receiving first image data from an image sensor at a first pixel clock rate. The method also includes receiving an instruction to perform a zoom operation and sending window information to the image sensor in response to the instruction. The method further includes receiving cropped image data corresponding to a portion of the image sensor that is associated with the zoom operation. The cropped image data is received at a second pixel clock rate that is slower than the first pixel clock rate. The method also includes upscaling the cropped image data to generate a zoomed image.
  • a system in another particular embodiment, includes a processor and a memory accessible to the processor.
  • the memory includes instructions that are executable by the processor to send window information to an image sensor in response to an instruction to implement a zoom operation.
  • the instructions are also executable by the processor to cause a pixel clock rate of the image sensor to be reduced from a first pixel clock rate to a second pixel clock rate that is less than the first pixel clock rate.
  • the instructions are also executable by the processor to receive cropped image data corresponding to a portion of the image sensor that is associated with the zoom operation. The cropped image data is received from the image sensor at the second pixel clock rate.
  • the instructions are also executable by the processor to upscale the cropped image data to generate a zoomed image.
  • One particular advantage provided by at least one of the disclosed embodiments is that a zoomed image may be generated without increasing a pixel clock rate of an image processing system. Another particular advantage that is provided by at least one of the disclosed embodiments is that improved image quality for zoomed images may be achieved.
  • FIG. 1 is a block diagram of a particular illustrative embodiment of a system to generate a zoomed image
  • FIG. 2 is a flow chart of a first particular embodiment of a method of generating a zoomed image
  • FIG. 3 is a flow chart of a second particular embodiment of a method of generating a zoomed image
  • FIG. 4 is a flow chart of a third particular embodiment of a method of generating a zoomed image
  • FIG. 5 is a flow chart of a fourth particular embodiment of a method of generating a zoomed image
  • FIG. 6 is a diagram illustrating distinctions in methods of generating a zoomed image
  • FIG. 7 is a diagram illustrating distinctions in methods of generating a preview display.
  • FIG. 8 is a block diagram of a particular embodiment of a portable device including an apparatus to generate a zoomed image.
  • FIG. 1 is a block diagram of a particular illustrative embodiment of a system to generate a zoomed image, the system designated 100 .
  • the system 100 may be a portable electronic device, such as a digital camera, a mobile telephone, a portable computing device, or another portable electronic device or apparatus that includes a camera.
  • the system 100 includes an image sensor 104 coupled to an image processing system 102 .
  • the system 100 may also include other components that are not illustrated, such as autofocus components, lenses, aperture control components, and so forth.
  • image is used herein to refer to a moving image (e.g., a movie or video image) or to a still image (e.g., a photograph or picture).
  • the system 100 includes a camera interface 108 to connect the image sensor 104 to the image processing system 102 .
  • the system 100 may also include an input device 142 (such as a switch, a soft switch, touch screen, or a button) that is adapted to receive user input to implement a zoom operation.
  • the system 100 may also include a display 128 that is adapted to display images captured by the image sensor 104 , images stored in a memory 120 , or both.
  • the display 128 may include a viewfinder, and a viewfinder module 126 of the image processing system 102 may generate a preview image for display at the display 128 .
  • the image processing system 102 may include an image processing pipeline 110 that is configured to perform various image processing functions (illustrated as processing modules 111 - 114 ) to generate an image from image data captured by the image sensor 104 .
  • the image processing pipeline 110 may include an upscaler 111 to upscale the image data to generate upscaled image data.
  • the upscaler 111 may interpolate or extrapolate additional pixels between pixels in the image data captured by the image sensor 104 .
  • the image processing pipeline 110 may also include an image sharpening module 112 to perform one or more image sharpening functions on the image data or the upscaled image data, an adaptive spatial filtering module 113 to perform spatial filtering on the image data or the upscaled image data, other pipeline functions 114 (e.g., demosaicing, gamma correction, white balance, compression, color space conversion, etc.), or any combination thereof.
  • image sharpening module 112 to perform one or more image sharpening functions on the image data or the upscaled image data
  • an adaptive spatial filtering module 113 to perform spatial filtering on the image data or the upscaled image data
  • other pipeline functions 114 e.g., demosaicing, gamma correction, white balance, compression, color space conversion, etc.
  • the image processing system 102 may also include a line buffer 116 that is used to store lines of image data during processing by modules of the image processing pipeline 110 , a processor 118 , or both.
  • the processor 118 may be adapted to execute instructions 122 stored in the memory 120 to process, store or display the image.
  • the processor 118 , the image processing pipeline 110 , or any combination thereof, may store processed image data 124 at the memory 120 .
  • the processed image data 124 may be compressed data (e.g., joint picture expert group (JPEG) image data) or uncompressed data.
  • JPEG joint picture expert group
  • the image processing system 102 includes a zoom controller 140 .
  • the zoom controller 140 is adapted to implement a zoom operation in response to user input received via the input device 142 .
  • the zoom controller 140 is illustrated in FIG. 1 as a separate module; however, in certain embodiments, functionality of the zoom controller 140 may be performed by several modules of the image processing system 102 , by instructions 122 executed by the processor 118 , or by any combination thereof.
  • the zoom controller 140 may send instructions to the image sensor 104 , the image processing pipeline 110 , the processor 118 , the view finder module 126 or any combination thereof, to implement the zoom operation.
  • the instructions sent by the zoom controller 140 may include, for example, window information 144 that may be sent to the image sensor 104 to indicate a portion of the image sensor 104 that is to provide image data for the zoom operation.
  • the instructions sent by the zoom controller 140 may cause a pixel clock rate 132 of the image sensor 104 to be changed to implement the zoom operation.
  • the zoom controller 140 may cause a master clock rate 130 that is provided to the image sensor 104 to be modified, which may result in the pixel clock rate 132 being modified.
  • the image sensor 104 may be adapted to change from a first pixel clock rate to a second pixel clock rate without causing an interruption in a frame rate at which image data is captured or output by the image sensor 104 .
  • the image sensor 104 may continue to output the image data at 30 frames per second after the pixel clock rate 132 is changed.
  • the image sensor 104 may further be adapted to change from the first pixel clock rate to the second pixel clock rate without entering a non-active mode (e.g., a standby mode) and without missing any frames (e.g., while maintaining a frame rate of the image sensor).
  • a non-active mode e.g., a standby mode
  • the system 100 may be used to capture images and to store the processed image data 124 at the memory 120 .
  • a user may indicate that a zoom operation is to be performed by providing an input via the input device 142 .
  • the zoom controller 140 may send the window information 144 to the image sensor 104 .
  • the image sensor 104 may generate cropped image data that corresponds to the portion of the image sensor 104 that is identified by the window information 144 .
  • the window information 144 may specify a set of pixels of the image sensor 104 that are to generate the cropped image data, and the image sensor 104 may send the image data associated with pixels of the set of pixels.
  • the zoom controller 140 may also cause the pixel clock rate 132 of the image sensor 104 to be reduced. For example, the zoom controller 140 may reduce the master clock rate 130 resulting in the pixel clock rate 132 of the image sensor 104 being reduced.
  • the cropped image data may be sent to the upscaler 111 via the camera interface 108 .
  • the upscaler 111 may upscale the cropped image data to generate zoomed image data. Upscaling the cropped image data causes the image data to include more pixels.
  • the zoomed image data may be provided to other functions of the image processing pipeline 110 , such as the image sharpening module 112 , the adaptive spatial filtering module 113 , the other pipeline functions 114 , or any combination thereof.
  • the cropped image data may be upscaled before other image processing pipeline functions are performed, which may provide improved image quality relative to upscaling image data after the image processing pipeline functions have been performed. Additionally, since the pixel clock rate 132 is reduced in order to output the cropped image data, the pixel clock rate of the image processing pipeline 110 does not become excessive when the number of pixels of the image data is increased by the upscaler 111 .
  • the cropped image data may be provided to the upscaler 111 without first being stored in the line buffer 116 , which may reduce latency in generating the zoomed image. Further, since the cropped image data is received from the image sensor 104 rather than being generated in the image processing system 102 by cropping image data from the entire image sensor 104 , no additional bus bandwidth is used to process or upscale the image data. Thus, power and bus bandwidth that would be used to write image data to the line buffer and to read the image date from the line buffer may be conserved.
  • the view finder module 126 may generate a preview display at the display 128 using sub-sampled image data from the image sensor 104 .
  • Sub-sampling refers to removing or omitting certain pixels or combining certain pixels in order to reduce a number of pixels represented in the sub-sampled image data. The number of pixels may be reduced in a relatively uniform manner (e.g., in a manner that retains the entire image but at a lower resolution), in contrast to cropping the image data, which refers to removing entire sections of the image.
  • the view finder module 126 may generate a zoomed preview display using the cropped image data.
  • the cropped image data may not be sub-sampled.
  • the zoomed preview display may be generated based on data that is not sub-sampled.
  • FIG. 2 is a flow chart of a first particular embodiment of a method of generating a zoomed image.
  • the method illustrated in FIG. 2 includes, at 202 , receiving an instruction to perform a zoom operation.
  • a user may provide a user input via an input device of an apparatus, such as the system 100 of FIG. 1 , to indicate that a zoom operation is to be performed.
  • the apparatus may generate the instruction to perform the zoom operation in response to the user input.
  • the method may also include, at 204 , sending window information to an image sensor based on the instruction.
  • the window information may correspond to a portion of the image sensor.
  • the zoom controller 140 of FIG. 1 may send the window information 144 to the image sensor 104 .
  • the window information 144 may indicate a particular portion of the image sensor 104 from which image data is to be output by the image sensor 104 .
  • the method may also include, at 206 , receiving cropped image data corresponding to the portion from the image sensor.
  • the image sensor 104 of FIG. 1 may output the cropped image data in response to the window information 144 .
  • the method may also include, at 208 , upscaling the cropped image data to generate a zoomed image.
  • the upscaler 111 of FIG. 1 may receive the cropped image data and may upscale the cropped image data to generated zoomed image data corresponding to a zoomed image.
  • the method of FIG. 2 may be implemented using a field-programmable gate array (FPGA) device, an application-specific integrated circuit (ASIC), a processing unit such as a central processing unit (CPU), a digital signal processor (DSP), a controller, another hardware device, firmware device, or any combination thereof.
  • FPGA field-programmable gate array
  • ASIC application-specific integrated circuit
  • CPU central processing unit
  • DSP digital signal processor
  • controller another hardware device, firmware device, or any combination thereof.
  • the method of FIG. 2 can be performed by a processor that executes instructions.
  • FIG. 3 is a flow chart of a second particular embodiment of a method of generating a zoomed image.
  • the method illustrated in FIG. 3 includes, at 302 , generating a display at a display device using sub-sampled image data from an image sensor.
  • the view finder module 126 of FIG. 1 may generate a view finder display at the display 128 using sub-sampled image data.
  • the image sensor 104 may output sub-sampled image data or the image processing pipeline 110 may include a functional module that sub-samples the image data provided by the image sensor 104 to generate the sub-sampled image data.
  • the sub-sampled image data may be processed for display at the display 128 .
  • the method may also include, at 304 , receiving an instruction to perform a zoom operation.
  • a user may provide a user input via an input device of an apparatus, such as the system 100 of FIG. 1 , to indicate that a zoom operation is to be performed.
  • the system 100 may generate the instruction to perform the zoom operation in response to the user input.
  • the method may also include, at 306 , sending window information to the image sensor based on the instruction.
  • the window information may correspond to a portion of the image sensor.
  • the zoom controller 140 of FIG. 1 may send the window information 144 to the image sensor 104 .
  • the window information 144 may indicate a particular portion of the image sensor 104 from which image data is to be output by the image sensor 104 .
  • the method may also include, at 308 , reducing a pixel clock rate of the image sensor in response to the instruction to perform the zoom operation.
  • the image processing system 102 of FIG. 1 may provide the master clock signal to the image sensor 104 .
  • the master clock signal may be specify the master clock rate 130 , which may be used to determine the pixel clock rate 132 of the image sensor 104 .
  • the pixel clock rate 132 may be reduced.
  • the method may also include, at 310 , receiving cropped image data corresponding to the portion from the image sensor.
  • the image sensor 104 of FIG. 1 may output cropped image data in response to the window information 144 .
  • the method may also include, at 312 , upscaling the cropped image data to generate a zoomed image.
  • the upscaler 111 of FIG. 1 may receive the cropped image data and may upscale the cropped image data to generate zoomed image data corresponding to a zoomed image.
  • the cropped image data is not stored in a line buffer before the cropped image data is upscaled. Thus, power and bus bandwidth that would be used to write image data to the line buffer and to read the image date from the line buffer may be conserved.
  • the method may also include, at 314 , generating a zoomed display at the display device in response to the instruction.
  • the view finder module 126 of FIG. 1 may generate a view finder display of the zoomed image at the display 128 .
  • the view finder module 126 may generate the view finder display using sub-sampled image data.
  • the view finder module 126 may use cropped image data from the image sensor 104 that is not sub-sampled.
  • the method may also include performing additional image processing using zoomed image data corresponding to the zoomed image.
  • the method may include performing an image sharpening operation on the zoomed image, at 316 , performing spatial filtering of the zoomed image, at 318 , or both.
  • Other image processing operations may be performed as well or in the alternative.
  • the method may also include storing the zoomed image data at a memory device, at 320 , displaying the zoomed image at a display device, at 322 , or any combination thereof.
  • the method of FIG. 3 may be implemented using a field-programmable gate array (FPGA) device, an application-specific integrated circuit (ASIC), a processing unit such as a central processing unit (CPU), a digital signal processor (DSP), a controller, another hardware device, firmware device, or any combination thereof.
  • FPGA field-programmable gate array
  • ASIC application-specific integrated circuit
  • CPU central processing unit
  • DSP digital signal processor
  • controller another hardware device, firmware device, or any combination thereof.
  • the method of FIG. 3 can be performed by a processor that executes instructions.
  • FIG. 4 is a flow chart of a third particular embodiment of a method of generating a zoomed image.
  • the method illustrated in FIG. 4 includes, at 402 , receiving first image data from an image sensor at a first pixel clock rate. For example, before an instruction to perform a zoom operation is received at the system 100 of FIG. 1 , the image sensor 104 may output the first image data at a first pixel clock rate.
  • the method may also include, at 404 , receiving an instruction to perform a zoom operation. For example, a user may provide a user input to indicate that a zoom operation is to be performed via the input device 142 of the system 100 of FIG. 1 .
  • the system 100 may generate the instruction to perform the zoom operation in response to the user input.
  • the method may also include, at 406 , sending window information to an image sensor based on the instruction.
  • the window information may correspond to a portion of the image sensor.
  • the zoom controller 140 of FIG. 1 may send the window information 144 to the image sensor 104 .
  • the window information 144 may indicate a particular portion of the image sensor 104 from which image data is to be output by the image sensor 104 .
  • the method may also include, at 406 , sending a pixel clock rate reduction request. In response to the pixel clock rate reduction request, a pixel clock rate of the image sensor may be reduced such that a frame rate of image data captured by the image sensor is maintained.
  • the method may also include, at 408 , receiving cropped image data corresponding to the portion from the image sensor.
  • the cropped image data may be received at a second pixel clock rate that is slower than the first pixel clock rate.
  • the image sensor 104 of FIG. 1 may output cropped image data in response to the window information 144 .
  • the master clock rate 130 may be reduced, causing the pixel clock rate 132 to be reduced.
  • the method may also include, at 410 , upscaling the cropped image data to generate a zoomed image.
  • the upscaler 111 of FIG. 1 may receive the cropped image data and may upscale the cropped image data to generated zoomed image data corresponding to a zoomed image.
  • the method of FIG. 4 may be implemented using a field-programmable gate array (FPGA) device, an application-specific integrated circuit (ASIC), a processing unit such as a central processing unit (CPU), a digital signal processor (DSP), a controller, another hardware device, firmware device, or any combination thereof.
  • FPGA field-programmable gate array
  • ASIC application-specific integrated circuit
  • CPU central processing unit
  • DSP digital signal processor
  • controller another hardware device, firmware device, or any combination thereof.
  • the method of FIG. 4 can be performed by a processor that executes instructions.
  • FIG. 5 is a flow chart of a fourth particular embodiment of a method of generating a zoomed image.
  • the method illustrated in FIG. 5 includes, at 502 , generating a display at a display device using sub-sampled image data from the image sensor.
  • the view finder module 126 of FIG. 1 may generate a view finder display at the display 128 using sub-sampled image data.
  • the image sensor 104 may output sub-sampled image data or the image processing pipeline 110 may include a functional module that sub-samples the image data provided by the image sensor 104 to generate the sub-sampled image data.
  • the sub-sampled image data may be processed for display at the display 128 .
  • the method may also include, at 504 , receiving first image data from an image sensor at a first pixel clock rate. For example, before an instruction to perform a zoom operation is received at the system 100 of FIG. 1 , the image sensor 104 may output the first image data at a first pixel clock rate.
  • the method may also include, at 506 , receiving the instruction to perform the zoom operation. For example, a user may provide a user input to indicate that the zoom operation is to be performed via the input device 142 of the system 100 of FIG. 1 .
  • the system 100 may generate the instruction to perform the zoom operation in response to the user input.
  • the method may also include, at 508 , sending window information to the image sensor based on the instruction and sending a pixel clock rate reduction request.
  • the window information may correspond to a portion of the image sensor.
  • the zoom controller 140 of FIG. 1 may send the window information 144 to the image sensor 104 .
  • the window information 144 may indicate a particular portion of the image sensor 104 from which image data is to be output by the image sensor 104 .
  • the method may also include, at 510 , receiving cropped image data corresponding to the portion from the image sensor. In response to the pixel clock rate reduction request, the cropped image data may be received at a second pixel clock rate that is slower than the first pixel clock rate.
  • the image sensor 104 of FIG. 1 may output cropped image data in response to the window information 144 .
  • the master clock rate 130 may be reduced, causing the pixel clock rate 132 to be reduced.
  • the method may include, at 514 , upscaling the cropped image data to generate a zoomed image.
  • the upscaler 111 of FIG. 1 may receive the cropped image data and may upscale the cropped image data to generate zoomed image data corresponding to a zoomed image.
  • the method may also include performing additional image processing using the zoomed image data.
  • the method may include performing an image sharpening operation on the zoomed image, at 516 , and performing spatial filtering of the zoomed image, at 518 .
  • Other image processing operations may be performed as well or in the alternative.
  • the method of FIG. 5 may be implemented using a field-programmable gate array (FPGA) device, an application-specific integrated circuit (ASIC), a processing unit such as a central processing unit (CPU), a digital signal processor (DSP), a controller, another hardware device, firmware device, or any combination thereof.
  • FPGA field-programmable gate array
  • ASIC application-specific integrated circuit
  • CPU central processing unit
  • DSP digital signal processor
  • controller another hardware device, firmware device, or any combination thereof.
  • the method of FIG. 5 can be performed by a processor that executes instructions.
  • FIG. 6 is a diagram illustrating distinctions between methods of generating a zoomed image.
  • a first method of generating the zoomed image is designated 600 and a second method of generating the zoomed image is designated 650 .
  • an image sensor 602 generates image data 614 at a first pixel clock rate.
  • the image sensor 602 may include an array of pixels, such as an array including approximately 2608 ⁇ 1950 pixels.
  • the first pixel clock rate of the image sensor 602 may be about 120 Mhz.
  • the image data 614 may be sent to an image processing pipeline 604 to have various image processing operations performed, e.g., demosaicing, color domain conversion, image sharpening, spatial filtering, etc.
  • the image processing pipeline 604 may process the image data 614 and write the image data 614 to one or more line buffers 606 .
  • the processed image data may be cropped by a crop processing module 608 to generate cropped image data 616 .
  • the cropped image data 616 may be upscaled by an upscaler 610 to generate upscaled image data 618 .
  • the upscaled image data 618 may be provided to other processing or storage modules 612 for further processing and storage.
  • the cropped image data 616 may be increased sixteen fold (i.e., 4 ⁇ vertical resolution and 4 ⁇ horizontal resolution).
  • the upscaled image data 618 may include approximately 16 times as many pixels as the cropped image data 616 . Since the cropped image data 616 is processed at the first pixel clock rate (e.g., about 120 Mhz), the upscaling results in the upscaled image data 618 being generated at pixel clock rate (e.g., about 1920 Mhz) that is sixteen times larger than the first pixel clock rate.
  • the first method 600 may result in a significant increase in the pixel clock rate when a zoomed image is generated.
  • first method 600 and the second method 650 certain characteristics of the systems and modules that perform the methods are described as common between the two methods. For example, images may be generated at the same frame rate between the two methods (e.g., 12 frames per second). Additionally, the zoom operation described for the second method 650 may be similar in magnitude to the zoom operation that is described for the first method 600 (e.g., a 4 ⁇ zoom). These similarities are merely for convenience of describing and comparing the two methods 600 , 650 and are not intended as limitations. For example, the first method 600 or the second method 650 may operate at frame rates greater than 12 frames per second or less than 12 frames per second. Additionally, the frame rate in either of the methods 600 , 650 may be changed to implement a zoom operation. Further, either of the methods 600 , 650 may be used to perform zoom operations greater than 4 ⁇ or less than 4 ⁇ . Additionally, the image sensor 602 may include more than 5M pixels or fewer than 5M pixels.
  • a zoom controller 652 provides window information 654 to the image sensor 602 .
  • the window information 654 includes information that identifies a portion of the image sensor 602 from which data is to be output as cropped image data 656 .
  • the window information 654 may identify a portion that corresponds to approximately one sixteenth of the pixels of the image sensor 602 (e.g., an area of the image sensor 602 including approximately 664 ⁇ 492 pixels).
  • the zoom controller 652 may also cause the image sensor 602 to reduce the image sensor's pixel clock rate to a second pixel clock rate.
  • the zoom controller 652 may send a signal to the image sensor 602 that causes the image sensor 602 to reduce the pixel clock rate.
  • the zoom controller 652 may cause a master clock signal sent to the image sensor 602 to be reduced, resulting in the pixel clock rate of the image sensor 602 being reduced.
  • the image sensor 602 may output the cropped image data 656 at the second pixel clock rate.
  • the second pixel clock rate may be approximately 12 Mhz.
  • the image processing pipeline 604 may receive the cropped image data 656 .
  • the upscaler 610 may be part of the image processing pipeline 604 .
  • the upscaler 610 may precede other pipeline processing modules 658 of the image processing pipeline 604 . That is, the upscaler 610 may process the cropped image data 656 before the other pipeline processing modules 658 .
  • the upscaler 610 may upscale the cropped image data 656 to generate zoomed image data 670 .
  • the number of pixels of the cropped image data 656 may be increased sixteen fold by the upscaler 610 . Accordingly, when the cropped image data 656 includes 664 ⁇ 492 pixels, the zoomed image data 670 may include 2656 ⁇ 1968 pixels.
  • the pixel clock rate may be increased sixteen fold.
  • the increased pixel clock rate in the image processing pipeline 604 after upscaling the cropped image data 656 may be approximately 192 Hz, which may be an acceptable pixel clock rate for certain image processing systems.
  • the image processing pipeline 604 may perform the other pipeline processing functions 658 , such as demosaicing, image sharpening, spatial filtering, color space transformation, etc. Additionally, the other processing or storage functions 612 may be performed using the zoomed image data 670 .
  • a zoomed image can be generated without increasing a pixel clock rate of an image processing system to an unacceptable level.
  • other image processing pipeline functions such as spatial filtering and image sharpening
  • image data is upscaled, which may provide improved image quality relative to performing image upscaling after the image processing functions.
  • the above referenced improvements can be achieved without increasing latency in the image processing system or bandwidth used by the image processing system.
  • FIG. 7 is a diagram illustrating methods of generating a preview display.
  • a first method of generating the preview display is designated 700 and a second method of generating the preview display is designated 750 .
  • the first method 700 may be used to generate the preview display before a zoom operation is implemented
  • the second method 750 may be used to generate the preview display when the zoom operation is implemented.
  • an image sensor 702 generates image data 710 .
  • the image data 710 is sub-sampled, either by the image sensor 702 or by a separate sub-sampling module 704 to generate sub-sampled image data 712 .
  • the sub-sampling may include removing certain pixels or combining certain pixels to reduce a number of pixels represented in the sub-sampled image data 712 .
  • the number of pixels may be reduced in a relatively uniform manner (e.g., in a manner that retains the entire image but at a lower resolution), in contrast to cropping the image data 710 which refers to removing entire sections of the image.
  • a view finder module 706 uses the sub-sampled image data 712 to generate a preview image 714 that is sent to a display device 708 .
  • the image sensor 702 generates the image data 710 .
  • the image data 710 is sent to a cropping module 752 without being sub-sampled.
  • the image data 710 may be sent at full resolution to the cropping module 752 .
  • the cropping module 752 may crop the image data 710 to generate cropped image data 754 .
  • the cropped image data 754 may be sent to the view finder module 706 , which uses the cropped image data 754 to generate a preview image 756 that is sent to a display device 708 .
  • the image data 710 is generated by the image sensor 702 in response to an instruction to perform a zoom operation.
  • window information may be sent to the image sensor 702 (as described with reference to FIG. 1 ).
  • the image sensor 702 may generate the cropped image data 754 , which may be sent to the view finder module 706 .
  • the second method 750 may generate a higher resolution preview display than the first method 700 , since the preview image 756 is not generated from sub-sampled image data 712 .
  • a system may include means for sending window information to an image sensor in response to an instruction to perform a zoom operation, such as the processor 118 of FIG. 1 executing the instructions 122 , the zoom controller 140 of FIG. 1 , one or more other devices or circuits configured to send window information to an image sensor, or any combination thereof.
  • the system may also include means to receive cropped image data corresponding to the portion from the image sensor, such as the camera interface 108 , or the image processing pipeline 110 of FIG. 1 , one or more other devices or circuits configured to receive cropped image data, or any combination thereof.
  • the system may also include means to upscale the cropped image data to generate a zoomed image, such as the upscaler 111 of FIG. 1 , one or more other devices or circuits configured to upscale the cropped image data, or any combination thereof.
  • FIG. 8 a block diagram of a particular illustrative embodiment of an electronic device 800 including a camera 824 and a zoom controller 820 that can implement a zoom command to generate a zoomed image is depicted.
  • the device 800 includes a processor 802 , such as a general purpose processor, an image processor, a digital signal processor, or any combination thereof, coupled to a memory 804 storing program instructions 836 that may be executable to implement the zoom controller 820 .
  • the processor 802 is also coupled to a camera controller 818 and a display controller 808 .
  • the display controller 808 is coupled to a display 810 .
  • a speaker 814 and a microphone 816 can be coupled to the processor 802 via a coder/decoder (CODEC) 812 .
  • CDEC coder/decoder
  • the electronic device 800 includes or is included within the system 100 of FIG. 1 , and the electronic device 800 operates in accordance with any of FIGS. 2-7 , or any combination thereof, to implement a zoom operation to generate a zoomed image using image data captured by the camera 824 .
  • FIG. 8 also indicates that a wireless interface 826 can be coupled to the processor 802 and to an antenna 828 .
  • the processor 802 , the display controller 808 , the camera controller 818 , the CODEC 812 , the memory 804 , and the wireless interface 826 are included in a system-in-package or system-on-chip device 830 .
  • a power supply 834 , the camera 824 , the speaker 814 , and the microphone 816 are coupled to the system-on-chip device 830 .
  • FIG. 8 illustrates that a wireless interface 826 can be coupled to the processor 802 and to an antenna 828 .
  • a power supply 834 , the camera 824 , the speaker 814 , and the microphone 816 are coupled to the system-on-chip device 830 .
  • FIG. 8 illustrates
  • the display 810 , the input device 832 , the speaker 814 , the microphone 816 , the antenna 828 , and the power supply 834 are external to the system-on-chip device 830 .
  • each of the display 810 , the input device 832 , the speaker 814 , the microphone 816 , the antenna 828 , the camera 824 , and the power supply 834 can be coupled to a component of the system-on-chip device 830 , such as to an interface or to a controller.
  • a software module may reside in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disk, a removable disk, a compact disc read-only memory (CD-ROM), or any other form of tangible storage medium known in the art.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium.
  • the storage medium may be integral to the processor.
  • the processor and the storage medium may reside in an application-specific integrated circuit (ASIC).
  • the ASIC may reside in a computing device or a user terminal.
  • the processor and the storage medium may reside as discrete components in a computing device or user terminal.

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US13/049,088 US20120236181A1 (en) 2011-03-16 2011-03-16 Generating a zoomed image
PCT/US2012/029287 WO2012125862A1 (en) 2011-03-16 2012-03-15 Generating a zoomed image
EP12713454.2A EP2687007A1 (de) 2011-03-16 2012-03-15 Erzeugung eines gezoomten bildes
KR1020137027292A KR101532861B1 (ko) 2011-03-16 2012-03-15 줌 이미지의 생성
JP2013558185A JP2014511071A (ja) 2011-03-16 2012-03-15 ズームされた画像の生成
CN201280013156.2A CN103430532B (zh) 2011-03-16 2012-03-15 产生经缩放图像的方法、设备及系统
US14/215,792 US9325905B2 (en) 2011-03-16 2014-03-17 Generating a zoomed image
JP2015204876A JP2016042712A (ja) 2011-03-16 2015-10-16 ズームされた画像の生成

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US20140198237A1 (en) 2014-07-17
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US9325905B2 (en) 2016-04-26
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