Y422 Color Capture support for Aravis in OpenCV

opencv_patch_aravis_y422_color.patch

From ceb9d548a6ed86e5f20f3f0605872145097bfbb6 Mon Sep 17 00:00:00 2001
From: Alexander Tarasikov <[email protected]>
Date: Fri, 2 Mar 2018 21:32:01 +0100
Subject: [PATCH] NOMERGE: Add Y422 color format support to Aravis

---
 modules/videoio/src/cap_aravis.cpp | 12 ++++++++++++
 samples/cpp/videocapture_basic.cpp | 15 +++++++++++----
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/modules/videoio/src/cap_aravis.cpp b/modules/videoio/src/cap_aravis.cpp
index f2fc9da77..8ed77048e 100644
--- a/modules/videoio/src/cap_aravis.cpp
+++ b/modules/videoio/src/cap_aravis.cpp
@@ -77,6 +77,7 @@
 //  Supported types of data:
 //      video/x-raw, fourcc:'GREY'  -> 8bit, 1 channel
 //      video/x-raw, fourcc:'Y800'  -> 8bit, 1 channel
+//      video/x-raw, fourcc:'Y422'  -> 8bit, 2 channel
 //      video/x-raw, fourcc:'Y12 '  -> 12bit, 1 channel
 //      video/x-raw, fourcc:'Y16 '  -> 16bit, 1 channel
 //      video/x-raw, fourcc:'GRBG'  -> 8bit, 1 channel
@@ -84,6 +85,7 @@
 
 #define MODE_GREY   CV_FOURCC_MACRO('G','R','E','Y')
 #define MODE_Y800   CV_FOURCC_MACRO('Y','8','0','0')
+#define MODE_Y422   CV_FOURCC_MACRO('Y','4','2','2')
 #define MODE_Y12    CV_FOURCC_MACRO('Y','1','2',' ')
 #define MODE_Y16    CV_FOURCC_MACRO('Y','1','6',' ')
 #define MODE_GRBG   CV_FOURCC_MACRO('G','R','B','G')
@@ -326,6 +328,10 @@ IplImage* CvCaptureCAM_Aravis::retrieveFrame(int)
                 depth = IPL_DEPTH_16U;
                 channels = 1;
                 break;
+            case ARV_PIXEL_FORMAT_YUV_422_PACKED:
+                depth = IPL_DEPTH_8U;
+                channels = 2;
+                break;
         }
         if(depth && channels) {
             IplImage src;
@@ -480,6 +486,8 @@ double CvCaptureCAM_Aravis::getProperty( int property_id ) const
                         return MODE_Y16;
                     case ARV_PIXEL_FORMAT_BAYER_GR_8:
                         return MODE_GRBG;
+                    case ARV_PIXEL_FORMAT_YUV_422_PACKED:
+                        return MODE_Y422;
                 }
             }
             break;
@@ -556,6 +564,10 @@ bool CvCaptureCAM_Aravis::setProperty( int property_id, double value )
                         newFormat = ARV_PIXEL_FORMAT_BAYER_GR_8;
                         targetGrey = 128;
                         break;
+                    case MODE_Y422:
+                        newFormat = ARV_PIXEL_FORMAT_YUV_422_PACKED;
+                        targetGrey = 128;
+                        break;
                 }
                 if(newFormat != pixelFormat) {
                     stopCapture();
diff --git a/samples/cpp/videocapture_basic.cpp b/samples/cpp/videocapture_basic.cpp
index 6f4671545..400187519 100644
--- a/samples/cpp/videocapture_basic.cpp
+++ b/samples/cpp/videocapture_basic.cpp
@@ -23,9 +23,11 @@ int main(int, char**)
     cap.open(0);
     // OR advance usage: select any API backend
     int deviceID = 0;             // 0 = open default camera
-    int apiID = cv::CAP_ANY;      // 0 = autodetect default API
+    int apiID = cv::CAP_ARAVIS;      // 0 = autodetect default API
     // open selected camera using selected API
     cap.open(deviceID + apiID);
+    //cap.set(CV_CAP_PROP_FOURCC, CV_FOURCC_MACRO('G', 'R', 'E', 'Y'));
+    cap.set(CV_CAP_PROP_FOURCC, CV_FOURCC_MACRO('Y', '4', '2', '2'));
     // check if we succeeded
     if (!cap.isOpened()) {
         cerr << "ERROR! Unable to open camera\n";
@@ -42,12 +44,17 @@ int main(int, char**)
         // check if we succeeded
         if (frame.empty()) {
             cerr << "ERROR! blank frame grabbed\n";
-            break;
+            continue;
+            //break;
         }
+        Mat rgb = Mat::zeros(frame.size(), CV_8UC3);
+        cvtColor(frame, rgb, COLOR_YUV2RGB_UYVY);
+        cvtColor(rgb, rgb, COLOR_RGB2BGR);
         // show live and wait for a key with timeout long enough to show images
-        imshow("Live", frame);
+        //imshow("Live", frame);
+        imshow("Live", rgb);
         if (waitKey(5) >= 0)
-            break;
+            continue;
     }
     // the camera will be deinitialized automatically in VideoCapture destructor
     return 0;
-- 
2.12.2