Android相机预览很暗 [英] Android camera preview is dark
问题描述
我正在尝试创建自定义相机应用.我从这里按照 Android 开发者示例进行了一些小的调整.但是，我的相机预览结果相当暗.另一方面，备用相机提供了更明亮的预览.
I am trying to create a custom camera app. I followed the Android Developer example from here with minor tweaks. However, my camera preview turns out to be rather dark. On the other hand, the stock camera gives a much brighter preview.
我尝试了几种设置以使其更好地工作，但似乎它们都没有任何影响.相关代码贴在这里.
I have tried several settings to make it work better but it seems none of them are having any impact. Relevant code is posted here.
CameraActivity(主)
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
if(CameraHelper.checkCameraHardware(this)) {
mHelper = new CameraHelper(this, getWindowManager().getDefaultDisplay());
}
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
mPreview = new CameraPreview(this, CameraHelper.camera);
mPreview.setLayoutParams(new LayoutParams(CameraHelper.mSize.width, CameraHelper.mSize.height, Gravity.CENTER));
preview.addView(mPreview);
}
CameraHelper类(初始化相机并设置默认参数)
CameraHelper class (initialize the camera and set the default parameters)
public CameraHelper(CameraListener listener, Display display){
mListener = listener;
camera = getCameraInstance();
mParameters = camera.getParameters();
initCameraParameters();
mSize = getPreviewSize(display);
mParameters.setFocusMode(Parameters.FOCUS_MODE_AUTO);
mParameters.setPictureSize(2560, 1920);
mParameters.setAutoExposureLock(false);
mParameters.setAutoWhiteBalanceLock(false);
mParameters.set("iso", "ISO800"); //Tried with 400, 800, 600 (values obtained from flatten())
mParameters.setColorEffect("none");
mParameters.setPictureSize(2560, 1920);
mParameters.setPreviewFrameRate(20);
mParameters.set("scene-mode", "auto");
mParameters.setFocusMode("auto");
mParameters.setExposureCompensation(4);
camera.setParameters(mParameters);
}
相机从上面的开发者页面链接的示例中将帧发送到 SurfaceHolder.Surface.
The Camera sends the frames to SurfaceHolder.Surface from the example linked from developer pages above.
在这里查看区别:库存相机应用我的相机应用
尝试根据此处发布的相机的 upack 参数设置 ISO 等.还是不行.
Tried setting the ISO, etc based on upack parameters from the camera as posted here. It still didn't work.
参数(16369):效果值=无，单色，负片，棕褐色，浅绿色，锐化，紫色，绿色色调，蓝色色调，粉色，黄色，红色色调，单色，古董；曝光补偿步长=0.5；焦距=3.43;focus-areas=(0,0,0,0,0);focus-distances=0.10,1.20,Infinity;focus-mode-values=auto,macro,facedetect;gps-altitude=0;gps-latitude=0;gps-longitude=0;gps-processing-method=GPS;gps-timestamp=0;horizontal-view-angle=51.2;iso=auto;iso-values=auto,ISO50,ISO100,ISO200,ISO400,ISO800,ISO1600;jpeg-quality=1;jpeg-thumbnail-height=480;jpeg-thumbnail-size-values=640x480,0x0;jpeg-thumbnail-width=640;max-exposure-compensation=4;max-num-focus-面积=1；最大缩放=12；最小曝光补偿=-4；图片格式=jpeg；图片格式值=jpeg；图片尺寸值=2560x1920,2560x1536,2048x1536,2048x1232,1600x1200,1600x960,800x480,640x480;preview-format=yuv420sp;preview-format-values=yuv420sp;preview-fps-range=15000,30000;preview-fps-range-values=(15000,30000);preview-frame-rate=30;preview-frame-rate-values=30;preview-size=640x480;preview-size-values=1280x720,800x480,720x480,640x480,352x288;rotation=0;scene-mode=auto;scene-mode-values=auto,肖像,风景,夜晚,海滩,雪景,日落,烟花,运动,派对,烛光,asd,背光，黄昏黎明，文本，秋天颜色；垂直视角=39.4；视频帧格式=yuv422i-yuyv；白平衡值=自动，白炽灯，荧光灯，日光，阴天；缩放=0；zoom-ratio=100,125,150,175,200,225,250,275,300,325,350,375,400;zoom-supported=true;focus-mode=auto;picture-size=2560x1920;exposure-compensation=4;
Parameters(16369): effect-values=none,mono,negative,sepia,aqua,sharpen,purple,green-tint,blue-tint,pink,yellow,red-tint,mono,antique;exposure-compensation-step=0.5;focal-length=3.43;focus-areas=(0,0,0,0,0);focus-distances=0.10,1.20,Infinity;focus-mode-values=auto,macro,facedetect;gps-altitude=0;gps-latitude=0;gps-longitude=0;gps-processing-method=GPS;gps-timestamp=0;horizontal-view-angle=51.2;iso=auto;iso-values=auto,ISO50,ISO100,ISO200,ISO400,ISO800,ISO1600;jpeg-quality=1;jpeg-thumbnail-height=480;jpeg-thumbnail-size-values=640x480,0x0;jpeg-thumbnail-width=640;max-exposure-compensation=4;max-num-focus-areas=1;max-zoom=12;min-exposure-compensation=-4;picture-format=jpeg;picture-format-values=jpeg;picture-size-values=2560x1920,2560x1536,2048x1536,2048x1232,1600x1200,1600x960,800x480,640x480;preview-format=yuv420sp;preview-format-values=yuv420sp;preview-fps-range=15000,30000;preview-fps-range-values=(15000,30000);preview-frame-rate=30;preview-frame-rate-values=30;preview-size=640x480;preview-size-values=1280x720,800x480,720x480,640x480,352x288;rotation=0;scene-mode=auto;scene-mode-values=auto,portrait,landscape,night,beach,snow,sunset,fireworks,sports,party,candlelight,asd,backlight,dusk-dawn,text,fall-color;vertical-view-angle=39.4;video-frame-format=yuv422i-yuyv;whitebalance-values=auto,incandescent,fluorescent,daylight,cloudy-daylight;zoom=0;zoom-ratios=100,125,150,175,200,225,250,275,300,325,350,375,400;zoom-supported=true;focus-mode=auto;picture-size=2560x1920;exposure-compensation=4;
根据下面的评论进一步测试后，看起来它只是预览变得比它应该的更暗.实际拍摄的图像光线充足，曝光补偿似乎工作正常.它只是让我头疼的预览.在运行 CM11 的 i9003 和运行 Stock android 的 Nexus 10 上测试.
Upon further testing based on comments below, it appears that its just the preview that is turning out darker than it should be. The actual captured image is well lit and exposure compensatiion seems to be working fine. Its just the preview that is giving me a headache. Tested on i9003 running CM11 and Nexus 10 running stock android.
推荐答案
根据我的实验，scene-mode 设置可以更改预览(与 ISO 或曝光补偿不同，它们都适用于捕获的图片).不要使用 auto.试试 scene-mode-values=night 或 scene-mode=dusk-dawn.
From my experiments, scene-mode setting can change the preview (unlike ISO or exposure-compensation, which both work for captured pictures). Don't use auto. Try scene-mode-values=night or scene-mode=dusk-dawn.
场景的问题是支持的值没有跨设备标准化.但是通常会出现某种 night.
The problem with scenes is that the supported values are not standardized across devices. But some kind of night is usually present.
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