TypeError: cv.warpPerspective is not a function

Hi
this is my code

```
const cv = require('opencv4nodejs');
var image = cv.imread('/public/staictest/cc.jpg');

var dstTri = [];
var srcTri = [];

srcTri[0] = new cv.Point2(70, 73);
srcTri[1] = new cv.Point2(312, 70);
srcTri[2] = new cv.Point2(323, 223);
srcTri[3] = new cv.Point2(63, 230);

dstTri[0] = new cv.Point2(0, 0);
dstTri[1] = new cv.Point2(260,0);
dstTri[2] = new cv.Point2(260,160);
dstTri[3] = new cv.Point2(0,160);
console.log(dstTri,srcTri);

var transform = cv.getPerspectiveTransform(srcTri, dstTri);
var drcimage;
var size = new cv.Size(160,260);
drcimage = cv.warpPerspective(transform, size);

cv.imwrite('/public/staictest/1111.jpg', drcimage);
cv.waitKey();

```

when i run the code

```

drcimage = cv.warpPerspective(transform, size);
^

TypeError: cv.warpPerspective is not a function
at Object. (/home/test/nodejs/helloworld.js:25:15)
at Module._compile (module.js:577:32)
at Object.Module._extensions..js (module.js:586:10)
at Module.load (module.js:494:32)
at tryModuleLoad (module.js:453:12)
at Function.Module._load (module.js:445:3)
at Module.runMain (module.js:611:10)
at run (bootstrap_node.js:394:7)
at startup (bootstrap_node.js:160:9)
at bootstrap_node.js:507:3

```
What should I do?

Read the opencv4nodejs warpPerspective API and compare it with the call in helloworld.js at line 25. Confirm the call produces an image suitable for cv.imwrite, then rerun the example and verify 1111.jpg is written without the TypeError.

Written by the indexing model from the issue text.