Change frame size for verilated Sobel

new file:   tut05/imgs/sobel_horizontal_640x480.jpg
modified:   tut05/readme.md tut05/rtl/edge_proc.v  tut05/src/main.cpp

sim_fpga/tutorial/tut05/readme.md

@@ -6,6 +6,31 @@ The edge processing has been modified from:
 
 * [../../../phys_fpga/alhambra_ii/apio/ov7670_yuv_80x60_sobel/edge_proc.v](../../../phys_fpga/alhambra_ii/apio/ov7670_yuv_80x60_sobel/edge_proc.v)
 
+---
 
+![Screenshot Sobel Horizontal 160x120](imgs/sobel_horizontal_160x120.jpg)
 
+---
 
+![Screenshot Sobel Vertical 160x120](imgs/sobel_vertical_160x120.jpg)
+
+---
+
+## Change image size
+
+To change the image size, you just have to change both src/main.cpp and rtl/edge_proc.v
+
+In src/main.cpp change the following lines to the desired values, here for example to 640x480
+
+    const int IMG_COLS = 640; 
+    const int IMG_ROWS = 480; 
+
+
+In rtl/edge_proc.v change the following lines to the same desired values
+
+    c_img_cols    = 640, // 10 bits
+    c_img_rows    = 480, //  9 bits
+
+The achieved fps are much lower (less than 1fps):
+
+![Screenshot Sobel Horizontal 640x480](imgs/sobel_horizontal_640x480.jpg)

sim_fpga/tutorial/tut05/rtl/edge_proc.v

@@ -12,11 +12,11 @@
 module edge_proc
   # (parameter
       // VGA
-      //c_img_cols    = 640, // 10 bits
-      //c_img_rows    = 480, //  9 bits
+      c_img_cols    = 640, // 10 bits
+      c_img_rows    = 480, //  9 bits
       // QQVGA
-      c_img_cols    = 160, // 8 bits
-      c_img_rows    = 120, //  7 bits
+      //c_img_cols    = 160, // 8 bits
+      //c_img_rows    = 120, //  7 bits
       // QQVGA /2
       //c_img_cols    = 80, // 7 bits
       //c_img_rows    = 60, //  6 bits

sim_fpga/tutorial/tut05/src/main.cpp

@@ -1,9 +1,8 @@
 // Authors:
 //  - Based on original version of David Lobato
 //  - Modified: Felipe Machado, https://github.com/felipe-m
-// Tutorial 3:
-//   - includes centroid and proximity
-//   - the image is larger 160x120
+// Tutorial 5:
+//   - Testing verilated Sobel filter with camera
 
 // imgui headers
 #include <SDL.h>
@@ -53,8 +52,8 @@ typedef cv::Vec<uint8_t, 3> BGRPixel;
 // the processed image has a 4th channel, which is Alpha: transparency
 typedef cv::Vec<uint8_t, 4> BGRAPixel;
 
-const int IMG_COLS = 160;
-const int IMG_ROWS = 120;
+const int IMG_COLS = 640;  // change here frame size
+const int IMG_ROWS = 480;  // change here frame size
 const int IMG_PXLS = IMG_COLS * IMG_ROWS;
 const uint8_t ALPHA_SOLID = 255;