org.opencv.highgui
Class Highgui

java.lang.Object
  org.opencv.highgui.Highgui

public class Highgui
extends java.lang.Object

Field Summary

static int	CV_CAP_ANDROID
static int	CV_CAP_ANDROID_ANTIBANDING_50HZ
static int	CV_CAP_ANDROID_ANTIBANDING_60HZ
static int	CV_CAP_ANDROID_ANTIBANDING_AUTO
static int	CV_CAP_ANDROID_ANTIBANDING_OFF
static int	CV_CAP_ANDROID_COLOR_FRAME
static int	CV_CAP_ANDROID_COLOR_FRAME_BGR
static int	CV_CAP_ANDROID_COLOR_FRAME_BGRA
static int	CV_CAP_ANDROID_COLOR_FRAME_RGB
static int	CV_CAP_ANDROID_COLOR_FRAME_RGBA
static int	CV_CAP_ANDROID_FLASH_MODE_AUTO
static int	CV_CAP_ANDROID_FLASH_MODE_OFF
static int	CV_CAP_ANDROID_FLASH_MODE_ON
static int	CV_CAP_ANDROID_FLASH_MODE_RED_EYE
static int	CV_CAP_ANDROID_FLASH_MODE_TORCH
static int	CV_CAP_ANDROID_FOCUS_MODE_AUTO
static int	CV_CAP_ANDROID_FOCUS_MODE_CONTINUOUS_VIDEO
static int	CV_CAP_ANDROID_FOCUS_MODE_EDOF
static int	CV_CAP_ANDROID_FOCUS_MODE_FIXED
static int	CV_CAP_ANDROID_FOCUS_MODE_INFINITY
static int	CV_CAP_ANDROID_FOCUS_MODE_MACRO
static int	CV_CAP_ANDROID_GREY_FRAME
static int	CV_CAP_ANDROID_WHITE_BALANCE_AUTO
static int	CV_CAP_ANDROID_WHITE_BALANCE_CLOUDY_DAYLIGHT
static int	CV_CAP_ANDROID_WHITE_BALANCE_DAYLIGHT
static int	CV_CAP_ANDROID_WHITE_BALANCE_FLUORESCENT
static int	CV_CAP_ANDROID_WHITE_BALANCE_INCANDESCENT
static int	CV_CAP_ANDROID_WHITE_BALANCE_SHADE
static int	CV_CAP_ANDROID_WHITE_BALANCE_TWILIGHT
static int	CV_CAP_ANDROID_WHITE_BALANCE_WARM_FLUORESCENT
static int	CV_CAP_AVFOUNDATION
static int	CV_CAP_PROP_ANDROID_ANTIBANDING
static int	CV_CAP_PROP_ANDROID_FLASH_MODE
static int	CV_CAP_PROP_ANDROID_FOCAL_LENGTH
static int	CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_FAR
static int	CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_NEAR
static int	CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_OPTIMAL
static int	CV_CAP_PROP_ANDROID_FOCUS_MODE
static int	CV_CAP_PROP_ANDROID_WHITE_BALANCE
static int	CV_CAP_PROP_AUTOGRAB
static int	CV_CAP_PROP_BACKLIGHT
static int	CV_CAP_PROP_FOCUS
static int	CV_CAP_PROP_FRAME_HEIGHT
static int	CV_CAP_PROP_FRAME_WIDTH
static int	CV_CAP_PROP_GUID
static int	CV_CAP_PROP_IOS_DEVICE_EXPOSURE
static int	CV_CAP_PROP_IOS_DEVICE_FLASH
static int	CV_CAP_PROP_IOS_DEVICE_FOCUS
static int	CV_CAP_PROP_IOS_DEVICE_TORCH
static int	CV_CAP_PROP_IOS_DEVICE_WHITEBALANCE
static int	CV_CAP_PROP_IRIS
static int	CV_CAP_PROP_ISO_SPEED
static int	CV_CAP_PROP_PAN
static int	CV_CAP_PROP_PREVIEW_FORMAT
static int	CV_CAP_PROP_ROLL
static int	CV_CAP_PROP_SETTINGS
static int	CV_CAP_PROP_TILT
static int	CV_CAP_PROP_XI_AE_MAX_LIMIT
static int	CV_CAP_PROP_XI_AEAG
static int	CV_CAP_PROP_XI_AEAG_LEVEL
static int	CV_CAP_PROP_XI_AG_MAX_LIMIT
static int	CV_CAP_PROP_XI_AUTO_WB
static int	CV_CAP_PROP_XI_DATA_FORMAT
static int	CV_CAP_PROP_XI_DOWNSAMPLING
static int	CV_CAP_PROP_XI_EXP_PRIORITY
static int	CV_CAP_PROP_XI_GPI_LEVEL
static int	CV_CAP_PROP_XI_GPI_MODE
static int	CV_CAP_PROP_XI_GPI_SELECTOR
static int	CV_CAP_PROP_XI_GPO_MODE
static int	CV_CAP_PROP_XI_GPO_SELECTOR
static int	CV_CAP_PROP_XI_LED_MODE
static int	CV_CAP_PROP_XI_LED_SELECTOR
static int	CV_CAP_PROP_XI_MANUAL_WB
static int	CV_CAP_PROP_XI_OFFSET_X
static int	CV_CAP_PROP_XI_OFFSET_Y
static int	CV_CAP_PROP_XI_TIMEOUT
static int	CV_CAP_PROP_XI_TRG_SOFTWARE
static int	CV_CAP_PROP_XI_TRG_SOURCE
static int	CV_CAP_PROP_ZOOM
static int	CV_CAP_XIAPI
static int	CV_CVTIMG_FLIP
static int	CV_CVTIMG_SWAP_RB
static int	CV_FONT_BLACK
static int	CV_FONT_BOLD
static int	CV_FONT_DEMIBOLD
static int	CV_FONT_LIGHT
static int	CV_FONT_NORMAL
static int	CV_IMWRITE_JPEG_QUALITY
static int	CV_IMWRITE_PNG_COMPRESSION
static int	CV_IMWRITE_PNG_STRATEGY
static int	CV_IMWRITE_PNG_STRATEGY_DEFAULT
static int	CV_IMWRITE_PNG_STRATEGY_FILTERED
static int	CV_IMWRITE_PNG_STRATEGY_FIXED
static int	CV_IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY
static int	CV_IMWRITE_PNG_STRATEGY_RLE
static int	CV_IMWRITE_PXM_BINARY
static int	CV_LOAD_IMAGE_ANYCOLOR
static int	CV_LOAD_IMAGE_ANYDEPTH
static int	CV_LOAD_IMAGE_COLOR
static int	CV_LOAD_IMAGE_GRAYSCALE
static int	CV_LOAD_IMAGE_UNCHANGED
static int	CV_STYLE_ITALIC
static int	CV_STYLE_NORMAL
static int	CV_STYLE_OBLIQUE
static int	IMREAD_ANYCOLOR
static int	IMREAD_ANYDEPTH
static int	IMREAD_COLOR
static int	IMREAD_GRAYSCALE
static int	IMREAD_UNCHANGED
static int	IMWRITE_JPEG_QUALITY
static int	IMWRITE_PNG_COMPRESSION
static int	IMWRITE_PNG_STRATEGY
static int	IMWRITE_PNG_STRATEGY_DEFAULT
static int	IMWRITE_PNG_STRATEGY_FILTERED
static int	IMWRITE_PNG_STRATEGY_FIXED
static int	IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY
static int	IMWRITE_PNG_STRATEGY_RLE
static int	IMWRITE_PXM_BINARY

Constructor Summary

Highgui()

Method Summary

static Mat	imdecode(Mat buf, int flags) Reads an image from a buffer in memory.
static boolean	imencode(java.lang.String ext, Mat img, MatOfByte buf) Encodes an image into a memory buffer.
static boolean	imencode(java.lang.String ext, Mat img, MatOfByte buf, MatOfInt params) Encodes an image into a memory buffer.
static Mat	imread(java.lang.String filename) Loads an image from a file.
static Mat	imread(java.lang.String filename, int flags) Loads an image from a file.
static boolean	imwrite(java.lang.String filename, Mat img) Saves an image to a specified file.
static boolean	imwrite(java.lang.String filename, Mat img, MatOfInt params) Saves an image to a specified file.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

CV_CAP_ANDROID

public static final int CV_CAP_ANDROID

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CV_CAP_ANDROID_ANTIBANDING_50HZ

public static final int CV_CAP_ANDROID_ANTIBANDING_50HZ

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CV_CAP_ANDROID_ANTIBANDING_60HZ

public static final int CV_CAP_ANDROID_ANTIBANDING_60HZ

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CV_CAP_ANDROID_ANTIBANDING_AUTO

public static final int CV_CAP_ANDROID_ANTIBANDING_AUTO

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CV_CAP_ANDROID_ANTIBANDING_OFF

public static final int CV_CAP_ANDROID_ANTIBANDING_OFF

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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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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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CV_CAP_ANDROID_FOCUS_MODE_AUTO

public static final int CV_CAP_ANDROID_FOCUS_MODE_AUTO

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CV_CAP_ANDROID_FOCUS_MODE_CONTINUOUS_VIDEO

public static final int CV_CAP_ANDROID_FOCUS_MODE_CONTINUOUS_VIDEO

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CV_CAP_ANDROID_FOCUS_MODE_EDOF

public static final int CV_CAP_ANDROID_FOCUS_MODE_EDOF

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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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CV_CAP_ANDROID_GREY_FRAME

public static final int CV_CAP_ANDROID_GREY_FRAME

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CV_CAP_ANDROID_WHITE_BALANCE_AUTO

public static final int CV_CAP_ANDROID_WHITE_BALANCE_AUTO

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CV_CAP_ANDROID_WHITE_BALANCE_CLOUDY_DAYLIGHT

public static final int CV_CAP_ANDROID_WHITE_BALANCE_CLOUDY_DAYLIGHT

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CV_CAP_ANDROID_WHITE_BALANCE_DAYLIGHT

public static final int CV_CAP_ANDROID_WHITE_BALANCE_DAYLIGHT

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CV_CAP_ANDROID_WHITE_BALANCE_FLUORESCENT

public static final int CV_CAP_ANDROID_WHITE_BALANCE_FLUORESCENT

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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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CV_CAP_ANDROID_WHITE_BALANCE_TWILIGHT

public static final int CV_CAP_ANDROID_WHITE_BALANCE_TWILIGHT

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CV_CAP_ANDROID_WHITE_BALANCE_WARM_FLUORESCENT

public static final int CV_CAP_ANDROID_WHITE_BALANCE_WARM_FLUORESCENT

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CV_CAP_AVFOUNDATION

public static final int CV_CAP_AVFOUNDATION

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CV_CAP_PROP_ANDROID_ANTIBANDING

public static final int CV_CAP_PROP_ANDROID_ANTIBANDING

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CV_CAP_PROP_ANDROID_FLASH_MODE

public static final int CV_CAP_PROP_ANDROID_FLASH_MODE

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CV_CAP_PROP_ANDROID_FOCAL_LENGTH

public static final int CV_CAP_PROP_ANDROID_FOCAL_LENGTH

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CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_FAR

public static final int CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_FAR

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CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_NEAR

public static final int CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_NEAR

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CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_OPTIMAL

public static final int CV_CAP_PROP_ANDROID_FOCUS_DISTANCE_OPTIMAL

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CV_CAP_PROP_ANDROID_FOCUS_MODE

public static final int CV_CAP_PROP_ANDROID_FOCUS_MODE

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CV_CAP_PROP_ANDROID_WHITE_BALANCE

public static final int CV_CAP_PROP_ANDROID_WHITE_BALANCE

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CV_CAP_PROP_AUTOGRAB

public static final int CV_CAP_PROP_AUTOGRAB

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CV_CAP_PROP_BACKLIGHT

public static final int CV_CAP_PROP_BACKLIGHT

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CV_CAP_PROP_FOCUS

public static final int CV_CAP_PROP_FOCUS

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CV_CAP_PROP_FRAME_HEIGHT

public static final int CV_CAP_PROP_FRAME_HEIGHT

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CV_CAP_PROP_FRAME_WIDTH

public static final int CV_CAP_PROP_FRAME_WIDTH

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CV_CAP_PROP_GUID

public static final int CV_CAP_PROP_GUID

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CV_CAP_PROP_IOS_DEVICE_EXPOSURE

public static final int CV_CAP_PROP_IOS_DEVICE_EXPOSURE

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CV_CAP_PROP_IOS_DEVICE_FLASH

public static final int CV_CAP_PROP_IOS_DEVICE_FLASH

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CV_CAP_PROP_IOS_DEVICE_FOCUS

public static final int CV_CAP_PROP_IOS_DEVICE_FOCUS

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CV_CAP_PROP_IOS_DEVICE_TORCH

public static final int CV_CAP_PROP_IOS_DEVICE_TORCH

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CV_CAP_PROP_IOS_DEVICE_WHITEBALANCE

public static final int CV_CAP_PROP_IOS_DEVICE_WHITEBALANCE

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CV_CAP_PROP_IRIS

public static final int CV_CAP_PROP_IRIS

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CV_CAP_PROP_ISO_SPEED

public static final int CV_CAP_PROP_ISO_SPEED

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CV_CAP_PROP_PAN

public static final int CV_CAP_PROP_PAN

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CV_CAP_PROP_PREVIEW_FORMAT

public static final int CV_CAP_PROP_PREVIEW_FORMAT

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CV_CAP_PROP_ROLL

public static final int CV_CAP_PROP_ROLL

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CV_CAP_PROP_SETTINGS

public static final int CV_CAP_PROP_SETTINGS

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CV_CAP_PROP_TILT

public static final int CV_CAP_PROP_TILT

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CV_CAP_PROP_XI_AE_MAX_LIMIT

public static final int CV_CAP_PROP_XI_AE_MAX_LIMIT

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CV_CAP_PROP_XI_AEAG

public static final int CV_CAP_PROP_XI_AEAG

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CV_CAP_PROP_XI_AEAG_LEVEL

public static final int CV_CAP_PROP_XI_AEAG_LEVEL

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CV_CAP_PROP_XI_AG_MAX_LIMIT

public static final int CV_CAP_PROP_XI_AG_MAX_LIMIT

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CV_CAP_PROP_XI_AUTO_WB

public static final int CV_CAP_PROP_XI_AUTO_WB

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CV_CAP_PROP_XI_DATA_FORMAT

public static final int CV_CAP_PROP_XI_DATA_FORMAT

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CV_CAP_PROP_XI_DOWNSAMPLING

public static final int CV_CAP_PROP_XI_DOWNSAMPLING

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CV_CAP_PROP_XI_EXP_PRIORITY

public static final int CV_CAP_PROP_XI_EXP_PRIORITY

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CV_CAP_PROP_XI_GPI_LEVEL

public static final int CV_CAP_PROP_XI_GPI_LEVEL

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CV_CAP_PROP_XI_GPI_MODE

public static final int CV_CAP_PROP_XI_GPI_MODE

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CV_CAP_PROP_XI_GPI_SELECTOR

public static final int CV_CAP_PROP_XI_GPI_SELECTOR

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CV_CAP_PROP_XI_GPO_MODE

public static final int CV_CAP_PROP_XI_GPO_MODE

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CV_CAP_PROP_XI_GPO_SELECTOR

public static final int CV_CAP_PROP_XI_GPO_SELECTOR

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CV_CAP_PROP_XI_LED_MODE

public static final int CV_CAP_PROP_XI_LED_MODE

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CV_CAP_PROP_XI_LED_SELECTOR

public static final int CV_CAP_PROP_XI_LED_SELECTOR

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CV_CAP_PROP_XI_MANUAL_WB

public static final int CV_CAP_PROP_XI_MANUAL_WB

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CV_CAP_PROP_XI_OFFSET_X

public static final int CV_CAP_PROP_XI_OFFSET_X

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CV_CAP_PROP_XI_OFFSET_Y

public static final int CV_CAP_PROP_XI_OFFSET_Y

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CV_CAP_PROP_XI_TIMEOUT

public static final int CV_CAP_PROP_XI_TIMEOUT

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CV_CAP_PROP_XI_TRG_SOFTWARE

public static final int CV_CAP_PROP_XI_TRG_SOFTWARE

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CV_CAP_PROP_XI_TRG_SOURCE

public static final int CV_CAP_PROP_XI_TRG_SOURCE

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CV_CAP_PROP_ZOOM

public static final int CV_CAP_PROP_ZOOM

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CV_CAP_XIAPI

public static final int CV_CAP_XIAPI

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CV_CVTIMG_FLIP

public static final int CV_CVTIMG_FLIP

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CV_CVTIMG_SWAP_RB

public static final int CV_CVTIMG_SWAP_RB

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CV_FONT_BLACK

public static final int CV_FONT_BLACK

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CV_FONT_BOLD

public static final int CV_FONT_BOLD

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CV_FONT_DEMIBOLD

public static final int CV_FONT_DEMIBOLD

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CV_FONT_LIGHT

public static final int CV_FONT_LIGHT

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CV_FONT_NORMAL

public static final int CV_FONT_NORMAL

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CV_IMWRITE_JPEG_QUALITY

public static final int CV_IMWRITE_JPEG_QUALITY

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CV_IMWRITE_PNG_COMPRESSION

public static final int CV_IMWRITE_PNG_COMPRESSION

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CV_IMWRITE_PNG_STRATEGY

public static final int CV_IMWRITE_PNG_STRATEGY

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CV_IMWRITE_PNG_STRATEGY_DEFAULT

public static final int CV_IMWRITE_PNG_STRATEGY_DEFAULT

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CV_IMWRITE_PNG_STRATEGY_FILTERED

public static final int CV_IMWRITE_PNG_STRATEGY_FILTERED

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CV_IMWRITE_PNG_STRATEGY_FIXED

public static final int CV_IMWRITE_PNG_STRATEGY_FIXED

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CV_IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY

public static final int CV_IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY

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CV_IMWRITE_PNG_STRATEGY_RLE

public static final int CV_IMWRITE_PNG_STRATEGY_RLE

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CV_IMWRITE_PXM_BINARY

public static final int CV_IMWRITE_PXM_BINARY

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CV_LOAD_IMAGE_ANYCOLOR

public static final int CV_LOAD_IMAGE_ANYCOLOR

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CV_LOAD_IMAGE_ANYDEPTH

public static final int CV_LOAD_IMAGE_ANYDEPTH

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CV_LOAD_IMAGE_COLOR

public static final int CV_LOAD_IMAGE_COLOR

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CV_LOAD_IMAGE_GRAYSCALE

public static final int CV_LOAD_IMAGE_GRAYSCALE

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CV_LOAD_IMAGE_UNCHANGED

public static final int CV_LOAD_IMAGE_UNCHANGED

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CV_STYLE_ITALIC

public static final int CV_STYLE_ITALIC

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CV_STYLE_NORMAL

public static final int CV_STYLE_NORMAL

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CV_STYLE_OBLIQUE

public static final int CV_STYLE_OBLIQUE

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IMREAD_ANYCOLOR

public static final int IMREAD_ANYCOLOR

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IMREAD_ANYDEPTH

public static final int IMREAD_ANYDEPTH

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IMREAD_COLOR

public static final int IMREAD_COLOR

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IMREAD_GRAYSCALE

public static final int IMREAD_GRAYSCALE

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IMREAD_UNCHANGED

public static final int IMREAD_UNCHANGED

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IMWRITE_JPEG_QUALITY

public static final int IMWRITE_JPEG_QUALITY

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IMWRITE_PNG_COMPRESSION

public static final int IMWRITE_PNG_COMPRESSION

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IMWRITE_PNG_STRATEGY

public static final int IMWRITE_PNG_STRATEGY

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IMWRITE_PNG_STRATEGY_DEFAULT

public static final int IMWRITE_PNG_STRATEGY_DEFAULT

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IMWRITE_PNG_STRATEGY_FILTERED

public static final int IMWRITE_PNG_STRATEGY_FILTERED

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IMWRITE_PNG_STRATEGY_FIXED

public static final int IMWRITE_PNG_STRATEGY_FIXED

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IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY

public static final int IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY

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IMWRITE_PNG_STRATEGY_RLE

public static final int IMWRITE_PNG_STRATEGY_RLE

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IMWRITE_PXM_BINARY

public static final int IMWRITE_PXM_BINARY

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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.

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.

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.

Parameters:

filename - Name of file to be loaded.

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

• >0 Return a 3-channel color image
• =0 Return a grayscale image
• <0 Return the loaded image as is. Note that in the current implementation the alpha channel, if any, is stripped from the output image. For example, a 4-channel RGBA image is loaded as RGB if flags >= 0.

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 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 XML 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

Parameters:

filename - Name of the file.

img - a img

See Also:

org.opencv.highgui.Highgui.imwrite

imwrite

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

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 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 XML 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

Parameters:

filename - Name of the file.

img - a img

params - Format-specific save parameters encoded as pairs paramId_1, paramValue_1, paramId_2, paramValue_2,.... The following parameters are currently supported:

• For JPEG, it can be a quality (CV_IMWRITE_JPEG_QUALITY) from 0 to 100 (the higher is the better). Default value is 95.
• For PNG, it can be the compression level (CV_IMWRITE_PNG_COMPRESSION) from 0 to 9. A higher value means a smaller size and longer compression time. Default value is 3.
• For PPM, PGM, or PBM, it can be a binary format flag (CV_IMWRITE_PXM_BINARY), 0 or 1. Default value is 1.

See Also:

org.opencv.highgui.Highgui.imwrite