Field Detail

• CV_CAP_ANDROID

  public static final int CV_CAP_ANDROID

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  Constant Field Values

• CV_CAP_ANDROID_ANTIBANDING_50HZ

  public static final int CV_CAP_ANDROID_ANTIBANDING_50HZ

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  Constant Field Values

• CV_CAP_ANDROID_ANTIBANDING_60HZ

  public static final int CV_CAP_ANDROID_ANTIBANDING_60HZ

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  Constant Field Values

• CV_CAP_ANDROID_ANTIBANDING_AUTO

  public static final int CV_CAP_ANDROID_ANTIBANDING_AUTO

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  Constant Field Values

• CV_CAP_ANDROID_ANTIBANDING_OFF

  public static final int CV_CAP_ANDROID_ANTIBANDING_OFF

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  Constant Field Values

• CV_CAP_ANDROID_BACK

  public static final int CV_CAP_ANDROID_BACK

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  Constant Field Values

• CV_CAP_ANDROID_COLOR_FRAME

  public static final int CV_CAP_ANDROID_COLOR_FRAME

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• CV_CAP_ANDROID_COLOR_FRAME_BGR

  public static final int CV_CAP_ANDROID_COLOR_FRAME_BGR

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• CV_CAP_ANDROID_COLOR_FRAME_BGRA

  public static final int CV_CAP_ANDROID_COLOR_FRAME_BGRA

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• CV_CAP_ANDROID_COLOR_FRAME_RGB

  public static final int CV_CAP_ANDROID_COLOR_FRAME_RGB

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• CV_CAP_ANDROID_COLOR_FRAME_RGBA

  public static final int CV_CAP_ANDROID_COLOR_FRAME_RGBA

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• CV_CAP_ANDROID_FLASH_MODE_AUTO

  public static final int CV_CAP_ANDROID_FLASH_MODE_AUTO

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  Constant Field Values

• CV_CAP_ANDROID_FLASH_MODE_OFF

  public static final int CV_CAP_ANDROID_FLASH_MODE_OFF

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• CV_CAP_ANDROID_FLASH_MODE_ON

  public static final int CV_CAP_ANDROID_FLASH_MODE_ON

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• CV_CAP_ANDROID_FLASH_MODE_RED_EYE

  public static final int CV_CAP_ANDROID_FLASH_MODE_RED_EYE

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• CV_CAP_ANDROID_FLASH_MODE_TORCH

  public static final int CV_CAP_ANDROID_FLASH_MODE_TORCH

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  Constant Field Values

• CV_CAP_ANDROID_FOCUS_MODE_AUTO

  public static final int CV_CAP_ANDROID_FOCUS_MODE_AUTO

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  Constant Field Values

• CV_CAP_ANDROID_FOCUS_MODE_CONTINUOUS_PICTURE

  public static final int CV_CAP_ANDROID_FOCUS_MODE_CONTINUOUS_PICTURE

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  Constant Field Values

• CV_CAP_ANDROID_FOCUS_MODE_CONTINUOUS_VIDEO

  public static final int CV_CAP_ANDROID_FOCUS_MODE_CONTINUOUS_VIDEO

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  Constant Field Values

• CV_CAP_ANDROID_FOCUS_MODE_EDOF

  public static final int CV_CAP_ANDROID_FOCUS_MODE_EDOF

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  Constant Field Values

• CV_CAP_ANDROID_FOCUS_MODE_FIXED

  public static final int CV_CAP_ANDROID_FOCUS_MODE_FIXED

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• CV_CAP_ANDROID_FOCUS_MODE_INFINITY

  public static final int CV_CAP_ANDROID_FOCUS_MODE_INFINITY

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• CV_CAP_ANDROID_FOCUS_MODE_MACRO

  public static final int CV_CAP_ANDROID_FOCUS_MODE_MACRO

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  Constant Field Values

• CV_CAP_ANDROID_FRONT

  public static final int CV_CAP_ANDROID_FRONT

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  Constant Field Values

• CV_CAP_ANDROID_GREY_FRAME

  public static final int CV_CAP_ANDROID_GREY_FRAME

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  Constant Field Values

• CV_CAP_ANDROID_WHITE_BALANCE_AUTO

  public static final int CV_CAP_ANDROID_WHITE_BALANCE_AUTO

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  Constant Field Values

• CV_CAP_ANDROID_WHITE_BALANCE_CLOUDY_DAYLIGHT

  public static final int CV_CAP_ANDROID_WHITE_BALANCE_CLOUDY_DAYLIGHT

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  Constant Field Values

• CV_CAP_ANDROID_WHITE_BALANCE_DAYLIGHT

  public static final int CV_CAP_ANDROID_WHITE_BALANCE_DAYLIGHT

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  Constant Field Values

• CV_CAP_ANDROID_WHITE_BALANCE_FLUORESCENT

  public static final int CV_CAP_ANDROID_WHITE_BALANCE_FLUORESCENT

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  Constant Field Values

• CV_CAP_ANDROID_WHITE_BALANCE_INCANDESCENT

  public static final int CV_CAP_ANDROID_WHITE_BALANCE_INCANDESCENT

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• CV_CAP_ANDROID_WHITE_BALANCE_SHADE

  public static final int CV_CAP_ANDROID_WHITE_BALANCE_SHADE

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  Constant Field Values

• CV_CAP_ANDROID_WHITE_BALANCE_TWILIGHT

  public static final int CV_CAP_ANDROID_WHITE_BALANCE_TWILIGHT

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  Constant Field Values

• CV_CAP_ANDROID_WHITE_BALANCE_WARM_FLUORESCENT

  public static final int CV_CAP_ANDROID_WHITE_BALANCE_WARM_FLUORESCENT

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  Constant Field Values

• CV_CAP_AVFOUNDATION

  public static final int CV_CAP_AVFOUNDATION

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  Constant Field Values

• CV_CAP_GIGANETIX

  public static final int CV_CAP_GIGANETIX

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  Constant Field Values

• CV_CAP_MSMF

  public static final int CV_CAP_MSMF

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  Constant Field Values

• CV_CAP_PROP_ANDROID_ANTIBANDING

  public static final int CV_CAP_PROP_ANDROID_ANTIBANDING

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  Constant Field Values

• CV_CAP_PROP_ANDROID_EXPOSE_LOCK

  public static final int CV_CAP_PROP_ANDROID_EXPOSE_LOCK

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  Constant Field Values

• CV_CAP_PROP_ANDROID_FLASH_MODE

  public static final int CV_CAP_PROP_ANDROID_FLASH_MODE

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  Constant Field Values

• CV_CAP_PROP_ANDROID_FOCAL_LENGTH

  public static final int CV_CAP_PROP_ANDROID_FOCAL_LENGTH

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  Constant Field Values

• CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_FAR

  public static final int CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_FAR

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  Constant Field Values

• CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_NEAR

  public static final int CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_NEAR

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  Constant Field Values

• CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_OPTIMAL

  public static final int CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_OPTIMAL

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  Constant Field Values

• CV_CAP_PROP_ANDROID_FOCUS_MODE

  public static final int CV_CAP_PROP_ANDROID_FOCUS_MODE

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  Constant Field Values

• CV_CAP_PROP_ANDROID_WHITE_BALANCE

  public static final int CV_CAP_PROP_ANDROID_WHITE_BALANCE

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  Constant Field Values

• CV_CAP_PROP_ANDROID_WHITEBALANCE_LOCK

  public static final int CV_CAP_PROP_ANDROID_WHITEBALANCE_LOCK

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  Constant Field Values

• CV_CAP_PROP_AUTOGRAB

  public static final int CV_CAP_PROP_AUTOGRAB

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  Constant Field Values

• CV_CAP_PROP_BACKLIGHT

  public static final int CV_CAP_PROP_BACKLIGHT

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  Constant Field Values

• CV_CAP_PROP_BUFFERSIZE

  public static final int CV_CAP_PROP_BUFFERSIZE

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  Constant Field Values

• CV_CAP_PROP_FOCUS

  public static final int CV_CAP_PROP_FOCUS

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  Constant Field Values

• CV_CAP_PROP_FRAME_HEIGHT

  public static final int CV_CAP_PROP_FRAME_HEIGHT

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  Constant Field Values

• CV_CAP_PROP_FRAME_WIDTH

  public static final int CV_CAP_PROP_FRAME_WIDTH

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  Constant Field Values

• CV_CAP_PROP_GIGA_FRAME_HEIGH_MAX

  public static final int CV_CAP_PROP_GIGA_FRAME_HEIGH_MAX

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  Constant Field Values

• CV_CAP_PROP_GIGA_FRAME_OFFSET_X

  public static final int CV_CAP_PROP_GIGA_FRAME_OFFSET_X

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  Constant Field Values

• CV_CAP_PROP_GIGA_FRAME_OFFSET_Y

  public static final int CV_CAP_PROP_GIGA_FRAME_OFFSET_Y

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  Constant Field Values

• CV_CAP_PROP_GIGA_FRAME_SENS_HEIGH

  public static final int CV_CAP_PROP_GIGA_FRAME_SENS_HEIGH

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  Constant Field Values

• CV_CAP_PROP_GIGA_FRAME_SENS_WIDTH

  public static final int CV_CAP_PROP_GIGA_FRAME_SENS_WIDTH

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  Constant Field Values

• CV_CAP_PROP_GIGA_FRAME_WIDTH_MAX

  public static final int CV_CAP_PROP_GIGA_FRAME_WIDTH_MAX

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  Constant Field Values

• CV_CAP_PROP_GUID

  public static final int CV_CAP_PROP_GUID

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  Constant Field Values

• CV_CAP_PROP_INTELPERC_DEPTH_CONFIDENCE_THRESHOLD

  public static final int CV_CAP_PROP_INTELPERC_DEPTH_CONFIDENCE_THRESHOLD

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  Constant Field Values

• CV_CAP_PROP_INTELPERC_DEPTH_FOCAL_LENGTH_HORZ

  public static final int CV_CAP_PROP_INTELPERC_DEPTH_FOCAL_LENGTH_HORZ

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  Constant Field Values

• CV_CAP_PROP_INTELPERC_DEPTH_FOCAL_LENGTH_VERT

  public static final int CV_CAP_PROP_INTELPERC_DEPTH_FOCAL_LENGTH_VERT

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  Constant Field Values

• CV_CAP_PROP_INTELPERC_DEPTH_LOW_CONFIDENCE_VALUE

  public static final int CV_CAP_PROP_INTELPERC_DEPTH_LOW_CONFIDENCE_VALUE

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  Constant Field Values

• CV_CAP_PROP_INTELPERC_DEPTH_SATURATION_VALUE

  public static final int CV_CAP_PROP_INTELPERC_DEPTH_SATURATION_VALUE

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  Constant Field Values

• CV_CAP_PROP_INTELPERC_PROFILE_COUNT

  public static final int CV_CAP_PROP_INTELPERC_PROFILE_COUNT

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  Constant Field Values

• CV_CAP_PROP_INTELPERC_PROFILE_IDX

  public static final int CV_CAP_PROP_INTELPERC_PROFILE_IDX

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  Constant Field Values

• CV_CAP_PROP_IOS_DEVICE_EXPOSURE

  public static final int CV_CAP_PROP_IOS_DEVICE_EXPOSURE

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  Constant Field Values

• CV_CAP_PROP_IOS_DEVICE_FLASH

  public static final int CV_CAP_PROP_IOS_DEVICE_FLASH

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  Constant Field Values

• CV_CAP_PROP_IOS_DEVICE_FOCUS

  public static final int CV_CAP_PROP_IOS_DEVICE_FOCUS

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  Constant Field Values

• CV_CAP_PROP_IOS_DEVICE_TORCH

  public static final int CV_CAP_PROP_IOS_DEVICE_TORCH

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  Constant Field Values

• CV_CAP_PROP_IOS_DEVICE_WHITEBALANCE

  public static final int CV_CAP_PROP_IOS_DEVICE_WHITEBALANCE

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  Constant Field Values

• CV_CAP_PROP_IRIS

  public static final int CV_CAP_PROP_IRIS

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  Constant Field Values

• CV_CAP_PROP_ISO_SPEED

  public static final int CV_CAP_PROP_ISO_SPEED

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  Constant Field Values

• CV_CAP_PROP_PAN

  public static final int CV_CAP_PROP_PAN

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  Constant Field Values

• CV_CAP_PROP_PREVIEW_FORMAT

  public static final int CV_CAP_PROP_PREVIEW_FORMAT

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  Constant Field Values

• CV_CAP_PROP_ROLL

  public static final int CV_CAP_PROP_ROLL

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  Constant Field Values

• CV_CAP_PROP_SETTINGS

  public static final int CV_CAP_PROP_SETTINGS

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  Constant Field Values

• CV_CAP_PROP_TILT

  public static final int CV_CAP_PROP_TILT

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  Constant Field Values

• CV_CAP_PROP_XI_AE_MAX_LIMIT

  public static final int CV_CAP_PROP_XI_AE_MAX_LIMIT

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  Constant Field Values

• CV_CAP_PROP_XI_AEAG

  public static final int CV_CAP_PROP_XI_AEAG

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  Constant Field Values

• CV_CAP_PROP_XI_AEAG_LEVEL

  public static final int CV_CAP_PROP_XI_AEAG_LEVEL

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  Constant Field Values

• CV_CAP_PROP_XI_AG_MAX_LIMIT

  public static final int CV_CAP_PROP_XI_AG_MAX_LIMIT

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  Constant Field Values

• CV_CAP_PROP_XI_AUTO_WB

  public static final int CV_CAP_PROP_XI_AUTO_WB

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  Constant Field Values

• CV_CAP_PROP_XI_DATA_FORMAT

  public static final int CV_CAP_PROP_XI_DATA_FORMAT

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  Constant Field Values

• CV_CAP_PROP_XI_DOWNSAMPLING

  public static final int CV_CAP_PROP_XI_DOWNSAMPLING

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  Constant Field Values

• CV_CAP_PROP_XI_EXP_PRIORITY

  public static final int CV_CAP_PROP_XI_EXP_PRIORITY

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  Constant Field Values

• CV_CAP_PROP_XI_GPI_LEVEL

  public static final int CV_CAP_PROP_XI_GPI_LEVEL

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  Constant Field Values

• CV_CAP_PROP_XI_GPI_MODE

  public static final int CV_CAP_PROP_XI_GPI_MODE

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  Constant Field Values

• CV_CAP_PROP_XI_GPI_SELECTOR

  public static final int CV_CAP_PROP_XI_GPI_SELECTOR

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  Constant Field Values

• CV_CAP_PROP_XI_GPO_MODE

  public static final int CV_CAP_PROP_XI_GPO_MODE

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  Constant Field Values

• CV_CAP_PROP_XI_GPO_SELECTOR

  public static final int CV_CAP_PROP_XI_GPO_SELECTOR

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  Constant Field Values

• CV_CAP_PROP_XI_LED_MODE

  public static final int CV_CAP_PROP_XI_LED_MODE

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  Constant Field Values

• CV_CAP_PROP_XI_LED_SELECTOR

  public static final int CV_CAP_PROP_XI_LED_SELECTOR

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  Constant Field Values

• CV_CAP_PROP_XI_MANUAL_WB

  public static final int CV_CAP_PROP_XI_MANUAL_WB

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  Constant Field Values

• CV_CAP_PROP_XI_OFFSET_X

  public static final int CV_CAP_PROP_XI_OFFSET_X

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  Constant Field Values

• CV_CAP_PROP_XI_OFFSET_Y

  public static final int CV_CAP_PROP_XI_OFFSET_Y

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  Constant Field Values

• CV_CAP_PROP_XI_TIMEOUT

  public static final int CV_CAP_PROP_XI_TIMEOUT

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  Constant Field Values

• CV_CAP_PROP_XI_TRG_SOFTWARE

  public static final int CV_CAP_PROP_XI_TRG_SOFTWARE

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  Constant Field Values

• CV_CAP_PROP_XI_TRG_SOURCE

  public static final int CV_CAP_PROP_XI_TRG_SOURCE

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  Constant Field Values

• CV_CAP_PROP_ZOOM

  public static final int CV_CAP_PROP_ZOOM

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  Constant Field Values

• CV_CAP_XIAPI

  public static final int CV_CAP_XIAPI

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  Constant Field Values

• CV_CVTIMG_FLIP

  public static final int CV_CVTIMG_FLIP

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  Constant Field Values

• CV_CVTIMG_SWAP_RB

  public static final int CV_CVTIMG_SWAP_RB

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  Constant Field Values

• CV_FONT_BLACK

  public static final int CV_FONT_BLACK

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  Constant Field Values

• CV_FONT_BOLD

  public static final int CV_FONT_BOLD

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  Constant Field Values

• CV_FONT_DEMIBOLD

  public static final int CV_FONT_DEMIBOLD

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  Constant Field Values

• CV_FONT_LIGHT

  public static final int CV_FONT_LIGHT

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  Constant Field Values

• CV_FONT_NORMAL

  public static final int CV_FONT_NORMAL

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  Constant Field Values

• CV_IMWRITE_JPEG_QUALITY

  public static final int CV_IMWRITE_JPEG_QUALITY

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  Constant Field Values

• CV_IMWRITE_PNG_BILEVEL

  public static final int CV_IMWRITE_PNG_BILEVEL

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  Constant Field Values

• CV_IMWRITE_PNG_COMPRESSION

  public static final int CV_IMWRITE_PNG_COMPRESSION

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  Constant Field Values

• CV_IMWRITE_PNG_STRATEGY

  public static final int CV_IMWRITE_PNG_STRATEGY

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  Constant Field Values

• CV_IMWRITE_PNG_STRATEGY_DEFAULT

  public static final int CV_IMWRITE_PNG_STRATEGY_DEFAULT

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  Constant Field Values

• CV_IMWRITE_PNG_STRATEGY_FILTERED

  public static final int CV_IMWRITE_PNG_STRATEGY_FILTERED

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  Constant Field Values

• CV_IMWRITE_PNG_STRATEGY_FIXED

  public static final int CV_IMWRITE_PNG_STRATEGY_FIXED

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  Constant Field Values

• CV_IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY

  public static final int CV_IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY

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  Constant Field Values

• CV_IMWRITE_PNG_STRATEGY_RLE

  public static final int CV_IMWRITE_PNG_STRATEGY_RLE

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  Constant Field Values

• CV_IMWRITE_PXM_BINARY

  public static final int CV_IMWRITE_PXM_BINARY

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  Constant Field Values

• CV_LOAD_IMAGE_ANYCOLOR

  public static final int CV_LOAD_IMAGE_ANYCOLOR

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  Constant Field Values

• CV_LOAD_IMAGE_ANYDEPTH

  public static final int CV_LOAD_IMAGE_ANYDEPTH

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  Constant Field Values

• CV_LOAD_IMAGE_COLOR

  public static final int CV_LOAD_IMAGE_COLOR

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  Constant Field Values

• CV_LOAD_IMAGE_GRAYSCALE

  public static final int CV_LOAD_IMAGE_GRAYSCALE

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  Constant Field Values

• CV_LOAD_IMAGE_UNCHANGED

  public static final int CV_LOAD_IMAGE_UNCHANGED

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  Constant Field Values

• CV_STYLE_ITALIC

  public static final int CV_STYLE_ITALIC

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  Constant Field Values

• CV_STYLE_NORMAL

  public static final int CV_STYLE_NORMAL

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  Constant Field Values

• CV_STYLE_OBLIQUE

  public static final int CV_STYLE_OBLIQUE

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  Constant Field Values

• IMREAD_ANYCOLOR

  public static final int IMREAD_ANYCOLOR

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  Constant Field Values

• IMREAD_ANYDEPTH

  public static final int IMREAD_ANYDEPTH

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  Constant Field Values

• IMREAD_COLOR

  public static final int IMREAD_COLOR

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  Constant Field Values

• IMREAD_GRAYSCALE

  public static final int IMREAD_GRAYSCALE

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  Constant Field Values

• IMREAD_UNCHANGED

  public static final int IMREAD_UNCHANGED

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  Constant Field Values

• IMWRITE_JPEG_QUALITY

  public static final int IMWRITE_JPEG_QUALITY

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  Constant Field Values

• IMWRITE_PNG_BILEVEL

  public static final int IMWRITE_PNG_BILEVEL

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  Constant Field Values

• IMWRITE_PNG_COMPRESSION

  public static final int IMWRITE_PNG_COMPRESSION

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  Constant Field Values

• IMWRITE_PNG_STRATEGY

  public static final int IMWRITE_PNG_STRATEGY

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  Constant Field Values

• IMWRITE_PNG_STRATEGY_DEFAULT

  public static final int IMWRITE_PNG_STRATEGY_DEFAULT

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  Constant Field Values

• IMWRITE_PNG_STRATEGY_FILTERED

  public static final int IMWRITE_PNG_STRATEGY_FILTERED

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  Constant Field Values

• IMWRITE_PNG_STRATEGY_FIXED

  public static final int IMWRITE_PNG_STRATEGY_FIXED

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  Constant Field Values

• IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY

  public static final int IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY

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  Constant Field Values

• IMWRITE_PNG_STRATEGY_RLE

  public static final int IMWRITE_PNG_STRATEGY_RLE

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  Constant Field Values

• IMWRITE_PXM_BINARY

  public static final int IMWRITE_PXM_BINARY

  See Also:

  Constant Field Values

Constructor Detail

• Highgui

  public Highgui()

Method Detail

• imdecode

  public static Mat imdecode(Mat buf,
             int flags)

  Reads an image from a buffer in memory.

  The function reads an image from the specified buffer in the memory. If the buffer is too short or contains invalid data, the empty matrix/image is returned.

  See "imread" for the list of supported formats and flags description.

  Note: In the case of color images, the decoded images will have the channels stored in B G R order.

  Parameters:

  buf - Input array or vector of bytes.

  flags - The same flags as in "imread".

  See Also:

  org.opencv.highgui.Highgui.imdecode

• imencode

  public static boolean imencode(java.lang.String ext,
                 Mat img,
                 MatOfByte buf)

  Encodes an image into a memory buffer.

  The function compresses the image and stores it in the memory buffer that is resized to fit the result. See "imwrite" for the list of supported formats and flags description.

  Note: cvEncodeImage returns single-row matrix of type CV_8UC1 that contains encoded image as array of bytes.

  Parameters:

  ext - File extension that defines the output format.

  img - Image to be written.

  buf - Output buffer resized to fit the compressed image.

  See Also:

  org.opencv.highgui.Highgui.imencode

• imencode

  public static boolean imencode(java.lang.String ext,
                 Mat img,
                 MatOfByte buf,
                 MatOfInt params)

  Encodes an image into a memory buffer.

  The function compresses the image and stores it in the memory buffer that is resized to fit the result. See "imwrite" for the list of supported formats and flags description.

  Note: cvEncodeImage returns single-row matrix of type CV_8UC1 that contains encoded image as array of bytes.

  Parameters:

  ext - File extension that defines the output format.

  img - Image to be written.

  buf - Output buffer resized to fit the compressed image.

  params - Format-specific parameters. See "imwrite".

  See Also:

  org.opencv.highgui.Highgui.imencode

• imread

  public static Mat imread(java.lang.String filename)

  Loads an image from a file.

  The function imread loads an image from the specified file and returns it. If the image cannot be read (because of missing file, improper permissions, unsupported or invalid format), the function returns an empty matrix (Mat.data==NULL). Currently, the following file formats are supported:

  • Windows bitmaps - *.bmp, *.dib (always supported)
  • JPEG files - *.jpeg, *.jpg, *.jpe (see the *Notes* section)
  • JPEG 2000 files - *.jp2 (see the *Notes* section)
  • Portable Network Graphics - *.png (see the *Notes* section)
  • Portable image format - *.pbm, *.pgm, *.ppm (always supported)
  • Sun rasters - *.sr, *.ras (always supported)
  • TIFF files - *.tiff, *.tif (see the *Notes* section)

  Note:

  • The function determines the type of an image by the content, not by the file extension.
  • On Microsoft Windows* OS and MacOSX*, the codecs shipped with an OpenCV image (libjpeg, libpng, libtiff, and libjasper) are used by default. So, OpenCV can always read JPEGs, PNGs, and TIFFs. On MacOSX, there is also an option to use native MacOSX image readers. But beware that currently these native image loaders give images with different pixel values because of the color management embedded into MacOSX.
  • On Linux*, BSD flavors and other Unix-like open-source operating systems, OpenCV looks for codecs supplied with an OS image. Install the relevant packages (do not forget the development files, for example, "libjpeg-dev", in Debian* and Ubuntu*) to get the codec support or turn on the OPENCV_BUILD_3RDPARTY_LIBS flag in CMake.

  Note: In the case of color images, the decoded images will have the channels stored in B G R order.

  Parameters:

  filename - Name of file to be loaded.

  See Also:

  org.opencv.highgui.Highgui.imread

• imread

  public static Mat imread(java.lang.String filename,
           int flags)

  Loads an image from a file.

  The function imread loads an image from the specified file and returns it. If the image cannot be read (because of missing file, improper permissions, unsupported or invalid format), the function returns an empty matrix (Mat.data==NULL). Currently, the following file formats are supported:

  • Windows bitmaps - *.bmp, *.dib (always supported)
  • JPEG files - *.jpeg, *.jpg, *.jpe (see the *Notes* section)
  • JPEG 2000 files - *.jp2 (see the *Notes* section)
  • Portable Network Graphics - *.png (see the *Notes* section)
  • Portable image format - *.pbm, *.pgm, *.ppm (always supported)
  • Sun rasters - *.sr, *.ras (always supported)
  • TIFF files - *.tiff, *.tif (see the *Notes* section)

  Note:

  • The function determines the type of an image by the content, not by the file extension.
  • On Microsoft Windows* OS and MacOSX*, the codecs shipped with an OpenCV image (libjpeg, libpng, libtiff, and libjasper) are used by default. So, OpenCV can always read JPEGs, PNGs, and TIFFs. On MacOSX, there is also an option to use native MacOSX image readers. But beware that currently these native image loaders give images with different pixel values because of the color management embedded into MacOSX.
  • On Linux*, BSD flavors and other Unix-like open-source operating systems, OpenCV looks for codecs supplied with an OS image. Install the relevant packages (do not forget the development files, for example, "libjpeg-dev", in Debian* and Ubuntu*) to get the codec support or turn on the OPENCV_BUILD_3RDPARTY_LIBS flag in CMake.

  Note: In the case of color images, the decoded images will have the channels stored in B G R order.

  Parameters:

  filename - Name of file to be loaded.

  flags - Flags specifying the color type of a loaded image:

  • CV_LOAD_IMAGE_ANYDEPTH - If set, return 16-bit/32-bit image when the input has the corresponding depth, otherwise convert it to 8-bit.
  • CV_LOAD_IMAGE_COLOR - If set, always convert image to the color one
  • CV_LOAD_IMAGE_GRAYSCALE - If set, always convert image to the grayscale one
  • >0 Return a 3-channel color image.

  Note: In the current implementation the alpha channel, if any, is stripped from the output image. Use negative value if you need the alpha channel.

  • =0 Return a grayscale image.
  • <0 Return the loaded image as is (with alpha channel).

  See Also:

  org.opencv.highgui.Highgui.imread

• imwrite

  public static boolean imwrite(java.lang.String filename,
                Mat img)

  Saves an image to a specified file.

  The function imwrite saves the image to the specified file. The image format is chosen based on the filename extension (see "imread" for the list of extensions). Only 8-bit (or 16-bit unsigned (CV_16U) in case of PNG, JPEG 2000, and TIFF) single-channel or 3-channel (with 'BGR' channel order) images can be saved using this function. If the format, depth or channel order is different, use "Mat.convertTo", and "cvtColor" to convert it before saving. Or, use the universal "FileStorage" I/O functions to save the image to XML or YAML format. It is possible to store PNG images with an alpha channel using this function. To do this, create 8-bit (or 16-bit) 4-channel image BGRA, where the alpha channel goes last. Fully transparent pixels should have alpha set to 0, fully opaque pixels should have alpha set to 255/65535. The sample below shows how to create such a BGRA image and store to PNG file. It also demonstrates how to set custom compression parameters

  // C++ code:

  #include

  #include

  #include

  using namespace cv;

  using namespace std;

  void createAlphaMat(Mat &mat)

  for (int i = 0; i < mat.rows; ++i) {

  for (int j = 0; j < mat.cols; ++j) {

  Vec4b& rgba = mat.at(i, j);

  rgba[0] = UCHAR_MAX;

  rgba[1] = saturate_cast((float (mat.cols - j)) / ((float)mat.cols) * UCHAR_MAX);

  rgba[2] = saturate_cast((float (mat.rows - i)) / ((float)mat.rows) * UCHAR_MAX);

  rgba[3] = saturate_cast(0.5 * (rgba[1] + rgba[2]));

  int main(int argv, char argc)

  // Create mat with alpha channel

  Mat mat(480, 640, CV_8UC4);

  createAlphaMat(mat);

  vector compression_params;

  compression_params.push_back(CV_IMWRITE_PNG_COMPRESSION);

  compression_params.push_back(9);

  try {

  imwrite("alpha.png", mat, compression_params);

  catch (runtime_error& ex) {

  fprintf(stderr, "Exception converting image to PNG format: %sn", ex.what());

  return 1;

  fprintf(stdout, "Saved PNG file with alpha data.n");

  return 0;

  Parameters:

  filename - Name of the file.

  img - a img

  See Also:

  org.opencv.highgui.Highgui.imwrite