why imread return empty matrix

asked 2017-02-04 20:57:43 -0600

hanaa
1

l'm work on android app with opencv 2.4.9 and in jni function l try to read images from database l test simple one Mat testSample = imread("/storage/emulated/0/h.jpg"); l search online but can't solve it but imread function return empty so what's problem? and what's debug mode or release mode (Do l face problem because of them if yes how to fix it) sorry l'm beginner

answered 2017-02-06 09:19:03 -0600

RajatGupta
1 ●1

updated 2017-02-06 09:22:12 -0600

This happens when image is not there or path is incorrect. Can you verify if image is at the location or not . If yes try with absolute path . Still having issue share code and image .

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actually it;s just simple code Mat b=(Highgui.imread("E:/h.jpg")); tv.setText(b.rows()+""); there's image in this paths and i can open it with other programs it's return 0

hanaa ( 2017-02-06 10:14:15 -0600 )edit

l thought there's something wrong in configuration because l try it and run right at python

hanaa ( 2017-02-06 10:18:42 -0600 )edit

neither "/storage/emulated/0/h.jpg" , nor "E:/h.jpg" is a valid path on an actual android device.

berak ( 2017-02-07 02:37:46 -0600 )edit

yeah if image is there then maybe path is wrong for accessing the image . Verify that the permission in your androidManifest.xml to read from external storage is correct.

RajatGupta ( 2017-02-07 02:55:46 -0600 )edit

no actually when l read from mobile storage it works but doesn't work from any path in my labtop

hanaa ( 2017-02-11 20:52:00 -0600 )edit

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