问题描述
我的目标是使用HSV颜色空间以只显示黄色对象的方式显示一个脱粒图像。我使用这个代码(基于由openCV 2.3.1 android示例给出的代码):
protected Bitmap processFrame(VideoCapture capture ){
//capture.retrieve(mGray,Highgui.CV_CAP_ANDROID_GREY_FRAME);
//Imgproc.cvtColor(mGray,mRgba,Imgproc.COLOR_GRAY2RGBA,4);
capture.retrieve(mHSV,Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGBA);
Imgproc.cvtColor(mHSV,mRgba,Imgproc.COLOR_RGB2HSV,4);
//Core.inRange(mRgba,new Scalar(20,100,100),new Scalar(30,255,255),mRgba);
Bitmap bmp = Bitmap.createBitmap(mRgba.cols(),mRgba.rows(),Bitmap.Config.ARGB_8888);
if(Utils.matToBitmap(mRgba,bmp))
return bmp;
bmp.recycle();
return null;
}
基本(抽象)类包含run方法:
protected abstract Bitmap processFrame(VideoCapture capture);
public void run(){
...
bmp = processFrame(mCamera);
...
canvas.drawBitmap(bmp,(canvas.getWidth() - bmp.getWidth())/ 2,(canvas.getHeight() - bmp.getHeight())/ 2,null );
...
}
我得到这个扭曲的预览,我想我可以理解(HSV格式),但为什么它重复自己(我画一条绿线来强调它)4次?什么是黑色水平线?
我做错了什么?
最后一件事,后面的逻辑是什么:
Imgproc.cvtColor(mHSV,mRgba ,Imgproc.COLOR_RGB2HSV,4);
为什么是COLOR_RGB2HSV?应该是COLOR_HSV2RGB?
假设我传递了这个问题,我如何使用原始颜色的黄色对象创建一个灰度级图像?我想使用Core.inRange()方法,但是当我这样做,我得到黑屏。
是的,我想我看起来像一个总的急动,但我需要开始
更新1:
i尝试以这种方式执行RGB-> HSV-> RGB:
@覆盖
protected Bitmap processFrame(VideoCapture capture){
//capture.retrieve(mGray,Highgui.CV_CAP_ANDROID_GREY_FRAME);
//Imgproc.cvtColor(mGray,mRgba,Imgproc.COLOR_GRAY2RGBA,4);
capture.retrieve(mRgba,Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGB);
Imgproc.cvtColor(mRgba,mHSV,Imgproc.COLOR_RGB2HSV,0);
//Imgproc.cvtColor(mRgba,mRgba,Imgproc.COLOR_BGR2RGB,4);
//Core.inRange(mRgba,new Scalar(20,100,100),new Scalar(30,255,255),mRgba);
Imgproc.cvtColor(mHSV,mRgba,Imgproc.COLOR_HSV2RGB,0);
Bitmap bmp = Bitmap.createBitmap(mRgba.cols(),mRgba.rows(),Bitmap.Config.ARGB_8888);
if(Utils.matToBitmap(mRgba,bmp))
return bmp;
bmp.recycle();
return null;
}
我得到:
?
更新2:
我终于明白,在设置框架之前,必须将其转换为RGB A 空格。
所以我现在尝试阈值与代码如下:
capture.retrieve(mRgba,Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGBA) ;
Imgproc.cvtColor(mRgba,mHSV,Imgproc.COLOR_RGB2HSV,0);
Core.inRange(mHSV,new Scalar(20,100,100),new Scalar(30,255,255),mHSVThreshed);
Imgproc.cvtColor(mHSVThreshed,mRgba,Imgproc.COLOR_HSV2RGB,0);
Imgproc.cvtColor(mRgba,mRgba,Imgproc.COLOR_RGB2RGBA,0);
Bitmap bmp = Bitmap.createBitmap(mRgba.cols(),mRgba.rows(),Bitmap.Config.ARGB_8888);
但现在它让我强制关闭...任何想法?
我认为mHSVThreshed是一个二进制mat
所以也许这行:
Imgproc.cvtColor(mHSVThreshed,mRgba,Imgproc.COLOR_HSV2RGB,0);
应更改为:
Imgproc.cvtColor(mHSVThreshed,mRgba,Imgproc.COLOR_GRAY2RGB,0);
我花了很多时间处理显示问题...
希望这个帮助...
my goal is to display a threshed image using the HSV color space in a way that only yellow objects will be shown. i use this code (based on a code given by the openCV 2.3.1 android samples):
protected Bitmap processFrame(VideoCapture capture) {
//capture.retrieve(mGray, Highgui.CV_CAP_ANDROID_GREY_FRAME);
//Imgproc.cvtColor(mGray, mRgba, Imgproc.COLOR_GRAY2RGBA, 4);
capture.retrieve(mHSV, Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGBA);
Imgproc.cvtColor(mHSV, mRgba, Imgproc.COLOR_RGB2HSV, 4);
//Core.inRange(mRgba, new Scalar(20, 100, 100), new Scalar(30, 255, 255), mRgba);
Bitmap bmp = Bitmap.createBitmap(mRgba.cols(), mRgba.rows(), Bitmap.Config.ARGB_8888);
if (Utils.matToBitmap(mRgba, bmp))
return bmp;
bmp.recycle();
return null;
}
the base (Abstract)class contains the "run" method:
protected abstract Bitmap processFrame(VideoCapture capture);
public void run() {
...
bmp = processFrame(mCamera);
...
canvas.drawBitmap(bmp, (canvas.getWidth() - bmp.getWidth()) / 2, (canvas.getHeight() - bmp.getHeight()) / 2, null);
...
}
i get this distorted preview which i think i can understand (HSV format) but why is it repeating itself (i`v draw a green line to emphasize it) 4 time? and what is the black horizontal line?what am i doing wrong?
one last thing, what is the logic behind:
Imgproc.cvtColor(mHSV, mRgba, Imgproc.COLOR_RGB2HSV, 4);
why is it COLOR_RGB2HSV? shouldnt it be COLOR_HSV2RGB?
Let's say i'v passed this problem, how can i make a gray level image with the yellow objects in their native color? i thought using the Core.inRange() method but when i do this i get black screen.
yes, i guess i look like a total jerk but i need to start from somewhere, don't i?
10x!
Update 1:i tried to do RGB->HSV->RGB this way:
@Override
protected Bitmap processFrame(VideoCapture capture) {
//capture.retrieve(mGray, Highgui.CV_CAP_ANDROID_GREY_FRAME);
//Imgproc.cvtColor(mGray, mRgba, Imgproc.COLOR_GRAY2RGBA, 4);
capture.retrieve(mRgba, Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGB);
Imgproc.cvtColor(mRgba, mHSV, Imgproc.COLOR_RGB2HSV,0);
//Imgproc.cvtColor(mRgba, mRgba, Imgproc.COLOR_BGR2RGB, 4);
//Core.inRange(mRgba, new Scalar(20, 100, 100), new Scalar(30, 255, 255), mRgba);
Imgproc.cvtColor(mHSV,mRgba , Imgproc.COLOR_HSV2RGB,0);
Bitmap bmp = Bitmap.createBitmap(mRgba.cols(), mRgba.rows(), Bitmap.Config.ARGB_8888);
if (Utils.matToBitmap(mRgba, bmp))
return bmp;
bmp.recycle();
return null;
}
and i got:
?
Update 2:
i finally understand that before setting a frame, it must be converted into RGBA space.so i now tried the threshold with the code as follow:
capture.retrieve(mRgba, Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGBA);
Imgproc.cvtColor(mRgba, mHSV, Imgproc.COLOR_RGB2HSV,0);
Core.inRange(mHSV, new Scalar(20, 100, 100), new Scalar(30, 255, 255), mHSVThreshed);
Imgproc.cvtColor(mHSVThreshed, mRgba, Imgproc.COLOR_HSV2RGB, 0);
Imgproc.cvtColor(mRgba, mRgba, Imgproc.COLOR_RGB2RGBA, 0);
Bitmap bmp = Bitmap.createBitmap(mRgba.cols(), mRgba.rows(), Bitmap.Config.ARGB_8888);
but now it gives me force shutdown... any ideas?
I think mHSVThreshed is a binary mat
so maybe this line :
Imgproc.cvtColor(mHSVThreshed, mRgba, Imgproc.COLOR_HSV2RGB, 0);
should change to :
Imgproc.cvtColor(mHSVThreshed, mRgba, Imgproc.COLOR_GRAY2RGB, 0);
I spent a lot of time dealing with the "showing" problem too...
hope this help...
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