fix: fix description of resolution in docs and examples

Author: WangYuxin-esp

README.md

@@ -152,10 +152,10 @@ static camera_config_t camera_config = {
     .ledc_channel = LEDC_CHANNEL_0,
 
     .pixel_format = PIXFORMAT_JPEG,//YUV422,GRAYSCALE,RGB565,JPEG
-    .frame_size = FRAMESIZE_UXGA,//QQVGA-QXGA Do not use sizes above QVGA when not JPEG
+    .frame_size = FRAMESIZE_UXGA,//QQVGA-UXGA, For ESP32, do not use sizes above QVGA when not JPEG. The performance of the ESP32-S series has improved a lot, but JPEG mode always gives better frame rates.
 
-    .jpeg_quality = 12, //0-63 lower number means higher quality
-    .fb_count = 1, //if more than one, i2s runs in continuous mode. Use only with JPEG
+    .jpeg_quality = 12, //0-63, for OV series camera sensors, lower number means higher quality
+    .fb_count = 1, //When jpeg mode is used, if fb_count more than one, the driver will work in continuous mode.
     .grab_mode = CAMERA_GRAB_WHEN_EMPTY//CAMERA_GRAB_LATEST. Sets when buffers should be filled
 };
 

examples/main/take_picture.c

@@ -120,10 +120,10 @@ static camera_config_t camera_config = {
     .ledc_channel = LEDC_CHANNEL_0,
 
     .pixel_format = PIXFORMAT_RGB565, //YUV422,GRAYSCALE,RGB565,JPEG
-    .frame_size = FRAMESIZE_QVGA,    //QQVGA-UXGA Do not use sizes above QVGA when not JPEG
+    .frame_size = FRAMESIZE_QVGA,    //QQVGA-UXGA, For ESP32, do not use sizes above QVGA when not JPEG. The performance of the ESP32-S series has improved a lot, but JPEG mode always gives better frame rates.
 
-    .jpeg_quality = 12, //0-63 lower number means higher quality
-    .fb_count = 1,       //if more than one, i2s runs in continuous mode. Use only with JPEG
+    .jpeg_quality = 12, //0-63, for OV series camera sensors, lower number means higher quality
+    .fb_count = 1,       //When jpeg mode is used, if fb_count more than one, the driver will work in continuous mode.
     .grab_mode = CAMERA_GRAB_WHEN_EMPTY,
 };
 

test/test_camera.c

@@ -147,10 +147,10 @@ static esp_err_t init_camera(uint32_t xclk_freq_hz, pixformat_t pixel_format, fr
         .ledc_channel = LEDC_CHANNEL_0,
 
         .pixel_format = pixel_format, //YUV422,GRAYSCALE,RGB565,JPEG
-        .frame_size = frame_size,    //QQVGA-UXGA Do not use sizes above QVGA when not JPEG
+        .frame_size = frame_size,    //QQVGA-UXGAQQVGA-UXGA, For ESP32, do not use sizes above QVGA when not JPEG. The performance of the ESP32-S series has improved a lot, but JPEG mode always gives better frame rates.
 
-        .jpeg_quality = 12, //0-63 lower number means higher quality
-        .fb_count = fb_count,       //if more than one, i2s runs in continuous mode. Use only with JPEG
+        .jpeg_quality = 12, //0-63, for OV series camera sensors, lower number means higher quality
+        .fb_count = fb_count,       //When jpeg mode is used, if fb_count more than one, the driver will work in continuous mode.
         .grab_mode = CAMERA_GRAB_WHEN_EMPTY
     };