Merge pull request #669 from piercus/inv

feat: Mat.inv()

Author: justadudewhohacks

cc/core/coreUtils.h

@@ -89,6 +89,7 @@
 	Nan::SetPrototypeMethod(ctor, "bitwiseXor", BitwiseXor);	\
 	Nan::SetPrototypeMethod(ctor, "abs", Abs);								\
 	Nan::SetPrototypeMethod(ctor, "transpose", Transpose);		\
+	Nan::SetPrototypeMethod(ctor, "inv", Inv);		\
 	Nan::SetPrototypeMethod(ctor, "determinant", Determinant);\
 	Nan::SetPrototypeMethod(ctor, "matMul", MatMul);
 
@@ -157,6 +158,9 @@
 	static NAN_METHOD(Transpose) {																						\
 		FF_SELF_OPERATOR(cv::transpose);									\
 	}																																					\
+	static NAN_METHOD(Inv) {																						\
+		FF_SELF_OPERATOR(cv::invert);									\
+	}																																					\
 	static NAN_METHOD(MatMul) {																								\
 		FF_OPERATOR(*, FF_APPLY_OPERATOR, Mat, "MatMul");					\
 	}																																					

lib/typings/Mat.d.ts

@@ -205,6 +205,7 @@ export class Mat {
   inRangeAsync(lower: Vec3, upper: Vec3): Promise<Mat>;
   integral(sdepth?: number, sqdepth?: number): { sum: Mat, sqsum: Mat, tilted: Mat };
   integralAsync(sdepth?: number, sqdepth?: number): Promise<{ sum: Mat, sqsum: Mat, tilted: Mat }>;
+  inv(): Mat;
   laplacian(ddepth: number, ksize?: number, scale?: number, delta?: number, borderType?: number): Mat;
   laplacianAsync(ddepth: number, ksize?: number, scale?: number, delta?: number, borderType?: number): Promise<Mat>;
   matMul(B: Mat): Mat;

test/tests/core/Mat/operatorTests.js

@@ -5,6 +5,7 @@ module.exports = function ({ cv, utils }) {
   const {
     assertError,
     assertDataDeepEquals,
+    assertDataAlmostDeepEquals,
     assertMetaData
   } = utils;
 
@@ -353,7 +354,25 @@ module.exports = function ({ cv, utils }) {
       assertDataDeepEquals(res.getDataAsArray(), expectedResult);
     });
   });
+  
+  describe('inv', () => {
+    it('apply inverse to matrix', () => {
+      const mat0 = new cv.Mat([
+        [4, 7],
+        [2, 6]
+      ], cv.CV_32F);
+      const expectedResult = [
+        [0.6, -0.7],
+        [-0.2, 0.4]
+      ];
 
+      const res = mat0.inv();
+      assertMetaData(res)(2, 2, cv.CV_32F);
+      
+      assertDataAlmostDeepEquals(res.getDataAsArray(), expectedResult);
+    });
+  });
+  
   describe('matMul', () => {
     operatorRequiresArg('matMul');