Merge pull request #24415 from thewoz:imread

Add imread #24415

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- [X] I agree to contribute to the project under Apache 2 License.
- [X] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [X] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

Hello everyone,
I created this new version of the imread function and I think it can be very useful in several cases.
It is actually passed to it object on which you want to upload the image.
The advantages can be different like in case one needs to open several large images all the same in sequence.
one can use the same pointer and the system would not allocate memory each time.

modules/python/test/test_imread.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+
+'''
+Test for imread
+'''
+
+# Python 2/3 compatibility
+from __future__ import print_function
+
+import cv2 as cv
+import numpy as np
+import sys
+
+from tests_common import NewOpenCVTests
+
+class imread_test(NewOpenCVTests):
+    def test_imread_to_buffer(self):
+        path = self.extraTestDataPath + '/cv/shared/lena.png'
+        ref = cv.imread(path)
+
+        img = np.zeros_like(ref)
+        cv.imread(path, img)
+        self.assertEqual(cv.norm(ref, img, cv.NORM_INF), 0.0)
+
+
+if __name__ == '__main__':
+    NewOpenCVTests.bootstrap()