A small question about the function -- insertObjectAnnotation.
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The funtion insertObjectAnnotation can be used to insert some annotation and output a RGB image. The usage of this function is not hard. However, the output image is almost white.
The original image and annotated image are shown in http://t1.qpic.cn/mblogpic/4f0c4b6023e0068989ba/460.jpg. The original image, I,is full-disk solar image with the size 256-by- 256 and the intensity vary from 0 to 4726.
Some code:
rgb = insertObjectAnnotation(I, 'rectangle', bbox, 'FI');
figure,subplot(1,2,1),imshow(I,[]),title('original image')
subplot(1,2,2),imshow(rgb,[]),title('Insert Annotation')
bbox is a 30-by-4 matrix.
Why the result is so strange.
2 Kommentare
Jan
am 30 Aug. 2013
Please define "strange" exactly. How do you obtain "the output image"? What is an intensity of -4? What is "I"? Is it an indexed image and the troubles come from an implicit conversion to a double RGB image? The shape of the sun differs between the both pictures. Is this expected?
Antworten (1)
Dima Lisin
am 25 Dez. 2013
What is the data type of your input image? Try converting the image to a double and rescaling it to the range [0,1] before calling insertObjectAnnotation. im2double should do that for you.
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