not able to run "Calculate Histogram", algorithm successfully on DM6446

Hello all,

I have DM6446 based custom board. On that board, I am trying to run pre-compiled VLIB and IMGLIB functions.

I have successfully integrated IMGLIB and VLIB algorithms as codecs, and now I am using them from my linux/arm application.

What I am trying to do is, 

1. Convert an YUV 4:2:2(U,Y,V,Y) image to HSL planes using VLIB algorithm, 

VLIB_convertUYVYint_to_HSLpl(yc, width, pitch, height, vlibcoeff, div_table, hue, s, v); 

where, yc -> input YUV 4:2:2 buffer (memory aligned to 64 bit)

             width -> 1024

   pitch -> 1024

   height -> 768

   vlibcoeff -> { 0x2000, 0x2BDD, -0x0AC5, -0x1658, 0x3770 };

   div_table [510] -> { 0, 32768, 16384, 10922, 8192, 6553, 5461, 4681,

4096, 3640, 3276, 2978, 2730, 2520, 2340, 2184, 2048, 1927, 1820, 1724, 1638,
1560, 1489, 1424, 1365, 1310, 1260, 1213, 1170, 1129, 1092, 1057,
1024, 992, 963, 936, 910, 885, 862, 840, 819, 799, 780, 762, 744, 728, 712, 697,
682, 668, 655, 642, 630, 618, 606, 595, 585, 574, 564, 555, 546, 537, 528, 520,
512, 504, 496, 489, 481, 474, 468, 461, 455, 448, 442, 436, 431, 425, 420, 414,
409, 404, 399, 394, 390, 385, 381, 376, 372, 368, 364, 360, 356, 352, 348, 344,
341, 337, 334, 330, 327, 324, 321, 318, 315, 312, 309, 306, 303, 300, 297, 295,
292, 289, 287, 284, 282, 280, 277, 275, 273, 270, 268, 266, 264, 262, 260, 258,
256, 254, 252, 250, 248, 246, 244, 242, 240, 239, 237, 235, 234, 232, 230, 229,
227, 225, 224, 222, 221, 219, 218, 217, 215, 214, 212, 211, 210, 208, 207, 206,
204, 203, 202, 201, 199, 198, 197, 196, 195, 193, 192, 191, 190, 189, 188, 187,
186, 185, 184, 183, 182, 181, 180, 179, 178, 177, 176, 175, 174, 173, 172, 171,
170, 169, 168, 168, 167, 166, 165, 164, 163, 163, 162, 161, 160, 159, 159, 158,
157, 156, 156, 155, 154, 153, 153, 152, 151, 151, 150, 149, 148, 148, 147, 146,
146, 145, 144, 144, 143, 143, 142, 141, 141, 140, 140, 139, 138, 138, 137, 137,
136, 135, 135, 134, 134, 133, 133, 132, 132, 131, 131, 130, 130, 129, 129, 128,
128, 127, 127, 126, 126, 125, 125, 124, 124, 123, 123, 122, 122, 121, 121, 120,
120, 120, 119, 119, 118, 118, 117, 117, 117, 116, 116, 115, 115, 114, 114, 114,
113, 113, 112, 112, 112, 111, 111, 111, 110, 110, 109, 109, 109, 108, 108, 108,
107, 107, 107, 106, 106, 106, 105, 105, 105, 104, 104, 104, 103, 103, 103, 102,
102, 102, 101, 101, 101, 100, 100, 100, 99, 99, 99, 98, 98, 98, 98, 97,
97, 97, 96, 96, 96, 96, 95, 95, 95, 94, 94, 94, 94, 93, 93, 93,
93, 92, 92, 92, 92, 91, 91, 91, 91, 90, 90, 90, 90, 89, 89, 89,
89, 88, 88, 88, 88, 87, 87, 87, 87, 86, 86, 86, 86, 86, 85, 85,
85, 85, 84, 84, 84, 84, 84, 83, 83, 83, 83, 82, 82, 82, 82, 82,
81, 81, 81, 81, 81, 80, 80, 80, 80, 80, 79, 79, 79, 79, 79, 78,
78, 78, 78, 78, 78, 77, 77, 77, 77, 77, 76, 76, 76, 76, 76, 76,
75, 75, 75, 75, 75, 74, 74, 74, 74, 74, 74, 73, 73, 73, 73, 73,
73, 72, 72, 72, 72, 72, 72, 72, 71, 71, 71, 71, 71, 71, 70, 70,
70, 70, 70, 70, 70, 69, 69, 69, 69, 69, 69, 68, 68, 68, 68, 68,
68, 68, 67, 67, 67, 67, 67, 67, 67, 67, 66, 66, 66, 66, 66, 66,
66, 65, 65, 65, 65, 65, 65, 65, 65, 64, 64, 64, 64, 64 };

hue -> Pointer to H plane (16-bit) (64 bit aligned)

s -> Pointer to S plane (8-bit) (64 bit aligned)

v -> Pointer to V plane (8-bit) (64 bit aligned)

2.  Now, I want to calculate histogram of "Lightness/Brightness" plane,

So I am using function from IMGLIB,

IMG_histogram_8 ((const unsigned char *)v, in_size, 1, temp_hist, hist);

v -> Input buffer (which is gray value buffer from HSV function)

in_size -> number of pixels (1024*768)

1 -> accumulation

temp_hist[1024] -> I have ensured that buffer is clear before sending it to a function

hist[256] -> output buffer

But the problem is, I am getting error nous output. As my image resolution is (1024*768), total no. of pixel in a frame is 786432.

When I sum up, total no. of pixels in each bin (ie, hist[0].....hist[255]), it shows me 12259457, instead of  786432.

What is wrong with the above logic?

Please guide me on this issue. 

Any help would be highly appreciated.

Thanks,

Krinali Shah