AM62A7: LDC module LUT inquiry

peng qiang

Part Number: AM62A7

Tool/software:

Hi experts

Can setting appropriate LUT in the LDC module achieve a 90 degree rotation of the screen.

for example，Images with a resolution of 1920 * 1280 can be displayed at a resolution of 1280 * 1920 after passing through the LDC module.

9 months ago

0 peng qiang 9 months ago

Prodigy 250 points

In addition, does the MSC module have the function of rotating the screen in addition to the zoom function?

0 Jianzhong Xu 9 months ago in reply to peng qiang

TI__Guru 52205 points

Hello Qiang,

Yes, LDC can rotate images by 90 degree, but MSC doesn't do that.

Regards,

Jianzhong

0 Gang Hua 9 months ago in reply to Jianzhong Xu

TI__Guru 52315 points

Hi peng,

peng qiang said:
Can setting appropriate LUT in the LDC module achieve a 90 degree rotation of the screen.

For these in-plane 2D transform, it is easier to use the 2D matrix in LDC (no need to use the LUT).

0 peng qiang 9 months ago in reply to Gang Hua

Prodigy 250 points

Gang Hua said:
For these in-plane 2D transform, it is easier to use the 2D matrix in LDC (no need to use the LUT)

Hi Gang

Does the two-dimensional matrix of LDC you mentioned refer to the parameters in the following figure。

I have consulted the manual. The first six parameters are affine transform coefficient.

The last two parameters are perspective warp transform coefficient.

Is there a more detailed introduction about two-dimensional matrices.

0 Gang Hua 9 months ago in reply to peng qiang

TI__Guru 52315 points

Hi Peng,

Yes, that is the one.

For 2D affine transform, you only need to use A,B,C,D,E,F.

It is a simple transform as below (you can ignore z, g, h).

(h_u, v_u) starts from (0,0) to output image (width-1, height-1).
Same for (h_afff, v_aff) for input image location.

You shall be able to find some previous discussion on e2e for this topic.

0 peng qiang 9 months ago in reply to Gang Hua

Prodigy 250 points

Hi Gang

I made modifications to the XML file;

a = 0;b= 4096;c = 0

d = 4096;e = 0;f = 0

The image has not changed.

Is there a problem with setting up where to use it?

0 peng qiang 9 months ago in reply to peng qiang

Prodigy 250 points

x3c_mesh_ldc_dcc.xml

<?xml version="1.0" encoding="utf-8"?>
<LDC_ODC xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <!--this is comment-->
  <dcc_name>ldc_odc</dcc_name>
  <dcc_header>
    <camera_module_id>     233</camera_module_id>
    <dcc_descriptor_id>   5</dcc_descriptor_id>
    <algorithm_vendor_id>   1</algorithm_vendor_id>
    <tunning_tool_version>       0</tunning_tool_version>
  </dcc_header>
  <!--=======================================================================-->
      <typedef>
      <cfg_ldc_vars type="struct"> 
                      <ldc_en type="uint16"> </ldc_en>
                      <ldc_ldmapen type="uint16"> </ldc_ldmapen>
                      <ldc_datamode type="uint16"> </ldc_datamode>
                      <ldc_opdatamode type="uint16"> </ldc_opdatamode>
                      <ldc_ip_dfmt type="uint16"> </ldc_ip_dfmt>
                      <ldc_pwarpen type="uint16"> </ldc_pwarpen>
                      <ldc_yint_typ type="uint16"> </ldc_yint_typ>
                      <ldc_regmode_en type="uint16"> </ldc_regmode_en>
                      <ldc_meshtable_m type="uint16"> </ldc_meshtable_m>
                      <ldc_mesh_frsz_w type="uint16"> </ldc_mesh_frsz_w>
                      <ldc_mesh_frsz_h type="uint16"> </ldc_mesh_frsz_h>
                      <ldc_compute_frsz_w type="uint16"> </ldc_compute_frsz_w>
                      <ldc_compute_frsz_h type="uint16"> </ldc_compute_frsz_h>
                      <ldc_initx type="uint16"> </ldc_initx>
                      <ldc_inity type="uint16"> </ldc_inity>
                      <ldc_input_frsz_w type="uint16"> </ldc_input_frsz_w>
                      <ldc_input_frsz_h type="uint16"> </ldc_input_frsz_h>
                      <ldc_obw type="uint16"> </ldc_obw>
                      <ldc_obh type="uint16"> </ldc_obh>
                      <ldc_pixpad type="uint16"> </ldc_pixpad>
                      <ldc_a type="int16"> </ldc_a>
                      <ldc_b type="int16"> </ldc_b>
                      <ldc_c type="int16"> </ldc_c>
                      <ldc_d type="int16"> </ldc_d>
                      <ldc_e type="int16"> </ldc_e>
                      <ldc_f type="int16"> </ldc_f>
                      <ldc_g type="int16"> </ldc_g>
                      <ldc_h type="int16"> </ldc_h>
                      <ldc_sf_width type="uint16[3]"> </ldc_sf_width>
                      <ldc_sf_height type="uint16[3]"> </ldc_sf_height>
                      <ldc_sf_en  type="uint16[3][3]"> </ldc_sf_en>
                      <ldc_sf_obw type="uint16[3][3]"> </ldc_sf_obw>
                      <ldc_sf_obh type="uint16[3][3]"> </ldc_sf_obh>
                      <ldc_sf_pad type="uint16[3][3]"> </ldc_sf_pad>
                      <ldc_ylut_en type="uint16"> </ldc_ylut_en>
                      <ldc_yin_bitdpth type="uint16"> </ldc_yin_bitdpth>
                      <ldc_yout_bitdpth type="uint16"> </ldc_yout_bitdpth>
                      <ldc_clut_en type="uint16"> </ldc_clut_en>
                      <ldc_cin_bitdpth type="uint16"> </ldc_cin_bitdpth>
                      <ldc_cout_bitdpth type="uint16"> </ldc_cout_bitdpth>
                      <ldc_y_lut type="uint16[513]"> </ldc_y_lut>
                      <ldc_c_lut type="uint16[513]"> </ldc_c_lut>
              		<mesh_table_pitch_in_bytes type="uint32"> </mesh_table_pitch_in_bytes>
              		<mesh_table_size type="uint32"> </mesh_table_size>
              		<mesh_lut type="uint16*"> </mesh_lut>
      </cfg_ldc_vars> 
   </typedef>
  <!--=======================================================================-->
		<use_case val="65535"> 
        <usecase_general>
            <ldc_dcc type="cfg_ldc_vars" main="general">
            {
                1     // LDC_CTRL  LDC_EN(0)         LDC Enable, 0: Disable,  1: Enable
                1     // LDC_CTRL  LDMAPEN(1)        LD Mapping enable, 0: disable, 1: enable
                2     // LDC_CTRL  DATAMODE(4:3)     Input data mode, 0:YUV422, 1:Y only, 2:YUV420, 3:YUV420 UV
                1     // LDC_CTRL  OP_DATAMODE  Output data mode, 0: keep UYVY; 1: convert to 420
                0     // LDC_CTRL  IP_DFMT(6:5) Input pixel format, 0:8b, 1:12b packed, 2:12b unpacked
                1     // LDC_CTRL  PWARPEN(7)   Perspective warp 0: Disable . 1: Enable
                1     // LDC_CFG   YINT_TYP(6)  Interpolation type for Y .  0: Bicubic,  1: Bilinear
                0     // LDC_CFG   REGMODE_EN           Region mode, 0: disable, 1: enable
                3     // LDC_MESHTABLE_CFG     M(2:0)   Mesh table subsampling factor (0-7)
                1920  // LDC_MESH_FRSZ       W(13:0)  Mesh frame width (0-8192)
                1080  // LDC_MESH_FRSZ       H(29:16)             Mesh frame height (0-8192)
                1920   // LDC_COMPUTE_FRSZ      W(13:0)  Compute width (0-8192)
                1080   // LDC_COMPUTE_FRSZ      H(29:16)             Compute height (0-8192)
                  0     // LDC_INITXY    INITX(13:0)  Output starting horizontal coordinate (0-8192)
                  0     // LDC_INITXY    INITY(29:16) Output starting vertical coordinate (0-8192)
                1920  // LDC_INPUT_FRSZ        W(29:16)             Input frame width
                1080  // LDC_INPUT_FRSZ        H(13:0)  Input frame height
                128    // LDC_BLOCK_SIZE        OBW(7:0)             Output block width (0-255)
                64    // LDC_BLOCK_SIZE        OBH(15:8)            Output block height (0-255)
                1     // LDC_BLOCK_SIZE        PIXPAD(19:16)        Pixel pad (0-15)
                0  // LDC_AB    A(15:0)  Affine Transform warp, A S16Q12
                4096     // LDC_AB    B(31:16)             Affine Transform warp, B S16Q12
                0     // LDC_CD    C(15:0)  Affine Transform warp, C S16Q3
                -4096     // LDC_CD    D(31:16)             Affine Transform warp, D S16Q12
                0  // LDC_EF    E(15:0)  Affine Transform warp, E S16Q12
                0     // LDC_EF    F(31:16)             Affine Transform warp, F S16Q3
                0     // LDC_GH    G(15:0)  Affine Transform warp, G S16Q23
                0     // LDC_GH    H(31:16)             Affine Transform warp, H S16Q23
                {0, 0, 0}     //ldc_sf_width [3]
                {0, 0, 0}     //ldc_sf_height[3]
                {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}}     //ldc_sf_en [3][3]
                {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}}     //ldc_sf_obw[3][3]
                {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}}     //ldc_sf_obh[3][3]
                {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}}     //ldc_sf_pad[3][3]
                0     // LDC_DUALOUT_CFG       YLUT_EN  Luma LUT enable (0-1)
                8     // LDC_DUALOUT_CFG       YIN_BITDPTH          Luma input bit depth (8-12)
                8     // LDC_DUALOUT_CFG       YOUT_BITDPTH         Luma output bit depth (8-12)
                0     // LDC_DUALOUT_CFG       CLUT_EN  Chroma LUT enable (0-1)
                8     // LDC_DUALOUT_CFG       CIN_BITDPTH          Chroma input bit depth (8-12)
                8     // LDC_DUALOUT_CFG       COUT_BITDPTH         Chroma output bit depth (8-12)
                {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,},
                {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,},
                1,
                1,
                {0}
            }
            </ldc_dcc>
        </usecase_general>
		</use_case> 
</LDC_ODC>

this is an xml file.

0 Gang Hua 9 months ago in reply to peng qiang

TI__Guru 52315 points

peng qiang said:
The image has not changed.

Hi peng,

You may try it out in tuning tool first to get the correct parameters.

+1 Gang Hua 9 months ago in reply to Gang Hua

TI__Guru 52315 points

Please refer to this link for more details.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1324990/tda4vh-q1-ldc-affine-rotate?tisearch=e2e-sitesearch&keymatch=LDC%20matrix%20rotation#

0 peng qiang 9 months ago in reply to Gang Hua

Prodigy 250 points

Gang Hua said:
(h_u, v_u) starts from (0,0) to output image (width-1, height-1).
Same for (h_afff, v_aff) for input image location.

Hi Gang

Is the input to LDC on the left side of the formula?
Normally, it's easier to understand input on the right side

0 Gang Hua 9 months ago in reply to peng qiang

TI__Guru 52315 points

Hi peng,

peng qiang said:
Is the input to LDC on the left side of the formula?

It is the normal y = f(x) notation with x for input and y for output.

0 peng qiang 9 months ago in reply to Gang Hua

Prodigy 250 points

Hi Gang

I asked a question unrelated to this case.

What is the use of this parameter in ae？

1586.gsttiovxisp.c

0 peng qiang 9 months ago in reply to Gang Hua

Prodigy 250 points

What is the coordinate system for affine transformation in the LDC module?Is it shown in the following picture？

0 Gang Hua 9 months ago in reply to peng qiang

TI__Guru 52315 points

Hi Peng,

peng qiang said:
What is the use of this parameter in ae？

This is for changing exposure time in steps.

0 Gang Hua 9 months ago in reply to peng qiang

TI__Guru 52315 points

peng qiang said:
I asked a question unrelated to this case.

BTW, please feel free to open a new thread with proper title for any new questions.
That is better for tracking.

0 Gang Hua 9 months ago in reply to peng qiang

TI__Guru 52315 points

Hi Peng,

peng qiang said:
What is the coordinate system for affine transformation in the LDC module?Is it shown in the following picture？

Yes, that is the right one.
LDC uses integer pixel counters starting from 0.

0 peng qiang 8 months ago in reply to Gang Hua

Prodigy 250 points

After rotating clockwise by 90 °, the position relationship should be as shown in the diagram。

The corresponding affine transformation matrix is

At this time, the x-coordinate should be shifted 1280（1920*1280） pixels in the positive direction。The corresponding radiative transformation matrix is.