diff --git a/hgdriver/hgdev/hg_scanner.cpp b/hgdriver/hgdev/hg_scanner.cpp
index 8f2de91..eb2f866 100644
--- a/hgdriver/hgdev/hg_scanner.cpp
+++ b/hgdriver/hgdev/hg_scanner.cpp
@@ -395,10 +395,10 @@ int hg_scanner::read_image_data(uint8_t* buf, size_t* len)
 {
 	return SCANNER_ERR_OK;
 }
-int hg_scanner::status(EP0REPLYSTATUS* ds)
+int hg_scanner::status(EP0REPLYSTATUS* ds, bool en_dev_log)
 {
 	if (ds)
-		scanner_->get_scanner_status(ds);
+		scanner_->get_scanner_status(ds, en_dev_log);
 
 	return status_;
 }
diff --git a/hgdriver/hgdev/hg_scanner.h b/hgdriver/hgdev/hg_scanner.h
index c379aa2..2efb1c2 100644
--- a/hgdriver/hgdev/hg_scanner.h
+++ b/hgdriver/hgdev/hg_scanner.h
@@ -118,7 +118,7 @@ public:
 	int re_connect(void);
 	int get_image_info(SANE_Parameters* pii);
 	int read_image_data(uint8_t* buf, size_t* len);
-	int status(EP0REPLYSTATUS* ds = nullptr);
+	int status(EP0REPLYSTATUS* ds = nullptr, bool en_dev_log = false/*enable device write log of this status*/);
 	std::string status_message(void);
 	bool is_online(void);
 
diff --git a/hgdriver/hgdev/scanner/async_usb_host.cpp b/hgdriver/hgdev/scanner/async_usb_host.cpp
index a6095de..835bf78 100644
--- a/hgdriver/hgdev/scanner/async_usb_host.cpp
+++ b/hgdriver/hgdev/scanner/async_usb_host.cpp
@@ -601,10 +601,22 @@ int async_usb_host::get_peer_config(LPPEERCFG cfg)
 {
 	SIMPLE_LOCK(io_lock_);
 	PEERCFG		v = { 0 };
-	int			err = libusb_control_transfer(usb_handle_, LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_IN
-											, USB_REQ_EP0_GET_PEER_CONFIG, 0, 0
-											, (unsigned char*)&v, sizeof(v)
-											, 1000);
+	int			err = 0;
+
+	v.pid = GetCurrentProcessId();
+	v.io_size = utils::get_page_size();
+	v.ver = PROTOCOL_VER;
+	err = libusb_control_transfer(usb_handle_, LIBUSB_REQUEST_TYPE_VENDOR/* | LIBUSB_ENDPOINT_IN*/
+								, USB_REQ_EP0_HAND_SHAKE, 0, 0
+								, (unsigned char*)&v, sizeof(v)
+								, 1000);
+	if (err == sizeof(v))
+	{
+		err = libusb_control_transfer(usb_handle_, LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_IN
+			, USB_REQ_EP0_HAND_SHAKE, 0, 0
+			, (unsigned char*)&v, sizeof(v)
+			, 1000);
+	}
 
 	if (cfg)
 		*cfg = v;
@@ -619,12 +631,12 @@ uint32_t async_usb_host::get_io_buffer_size(void)
 {
 	return peer_cfg_.io_size;
 }
-int async_usb_host::get_peer_status(LPEP0REPLYSTATUS status)
+int async_usb_host::get_peer_status(LPEP0REPLYSTATUS status, bool en_dev_log)
 {
 	SIMPLE_LOCK(io_lock_);
 
 	return libusb_control_transfer(usb_handle_, LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_IN
-		, USB_REQ_EP0_GET_STATUS, 0, 0
+		, USB_REQ_EP0_GET_STATUS, 0, en_dev_log
 		, (unsigned char*)status, sizeof(*status)
 		, 1000) == sizeof(*status) ? 0 : EFAULT;
 }
@@ -653,7 +665,7 @@ int async_usb_host::reset_peer(uint32_t timeout)
 		empty->release();
 
 		tc.reset();
-		while ((err = get_peer_status(&status)) == 0)
+		while ((err = get_peer_status(&status, false)) == 0)
 		{
 			if (status.in_status == WORKER_STATUS_IDLE && status.out_status == WORKER_STATUS_IDLE && status.task_cnt == 0
 				&& status.task_required_bytes == 0 && status.packets_to_sent == 0)
diff --git a/hgdriver/hgdev/scanner/async_usb_host.h b/hgdriver/hgdev/scanner/async_usb_host.h
index b1d9371..7f18921 100644
--- a/hgdriver/hgdev/scanner/async_usb_host.h
+++ b/hgdriver/hgdev/scanner/async_usb_host.h
@@ -93,7 +93,7 @@ public:
 	int get_peer_config(LPPEERCFG cfg);
 	uint16_t get_protocol_version(void);
 	uint32_t get_io_buffer_size(void);
-	int get_peer_status(LPEP0REPLYSTATUS status);
+	int get_peer_status(LPEP0REPLYSTATUS status, bool en_dev_log);
 	int reset_peer(uint32_t timeout = 2000/*ms*/);
 	int set_gadget_encrypting_method(uint32_t cmd_enc = ENCRYPT_CMD_NONE, uint32_t payload_enc = ENCRYPT_NONE, uint8_t enc_data = 0);
 
diff --git a/hgdriver/hgdev/scanner/scanner_handler.cpp b/hgdriver/hgdev/scanner/scanner_handler.cpp
index 5cb9c16..15d6a14 100644
--- a/hgdriver/hgdev/scanner/scanner_handler.cpp
+++ b/hgdriver/hgdev/scanner/scanner_handler.cpp
@@ -324,12 +324,12 @@ int scanner_handler::get_peer_config(LPPEERCFG cfg)
 
 	return 0;
 }
-int scanner_handler::get_scanner_status(LPEP0REPLYSTATUS status)
+int scanner_handler::get_scanner_status(LPEP0REPLYSTATUS status, bool en_dev_log)
 {
 	if (!is_scanner_available())
 		return ENODEV;
 
-	return usb_->get_peer_status(status);
+	return usb_->get_peer_status(status, en_dev_log);
 }
 int scanner_handler::restart_peer_bulk(uint32_t timeout)
 {
diff --git a/hgdriver/hgdev/scanner/scanner_handler.h b/hgdriver/hgdev/scanner/scanner_handler.h
index c67e753..0cce736 100644
--- a/hgdriver/hgdev/scanner/scanner_handler.h
+++ b/hgdriver/hgdev/scanner/scanner_handler.h
@@ -99,7 +99,7 @@ protected:
 public:
 	// following methods transferred by EP0
 	int get_peer_config(LPPEERCFG cfg);
-	int get_scanner_status(LPEP0REPLYSTATUS status);
+	int get_scanner_status(LPEP0REPLYSTATUS status, bool en_dev_log);
 	int restart_peer_bulk(uint32_t timeout = 1000/*ms*/);
 
 	// following methods transferred by Bulk, blocked ...
diff --git a/sdk/base/data.cpp b/sdk/base/data.cpp
index 2af22e5..c13c361 100644
--- a/sdk/base/data.cpp
+++ b/sdk/base/data.cpp
@@ -486,7 +486,7 @@ file_reader::~file_reader()
 	if (map_)
 		map_->release();
 	notify_progress(len_, len_, 0);	// ensure 100%
-	utils::to_log(LOG_LEVEL_DEBUG, "Read over of file(%s) at(%p/%p).\n", path_.c_str(), consume_, len_);
+	utils::to_log(LOG_LEVEL_DEBUG, "Read over of file(%s) at(%llu/%llu).\n", path_.c_str(), consume_, len_);
 }
 
 int file_reader::open(const char* file, bool in_mem, size_t off)
diff --git a/sdk/base/packet.h b/sdk/base/packet.h
index 50ea2d0..cb89e61 100644
--- a/sdk/base/packet.h
+++ b/sdk/base/packet.h
@@ -46,8 +46,8 @@ enum cancel_io
 };
 enum ep0_req
 {
-	USB_REQ_EP0_GET_PEER_CONFIG = 100,	// get protocol version (PROTOCOL_VER), req = me, ind = 0, val = 0, len = sizeof(PEERCFG)
-	USB_REQ_EP0_GET_STATUS,				// 获取各工作线程状态, return EP0REPLYSTATUS. req = me, ind = 0, val = 0, len = sizeof(EP0REPLYSTATUS)
+	USB_REQ_EP0_HAND_SHAKE = 100,		// hand-shake[in/out] with data LPPEERCFG, req = me, ind = 0, val = 0, len = sizeof(PEERCFG)
+	USB_REQ_EP0_GET_STATUS,				// 获取各工作线程状态, return EP0REPLYSTATUS. req = me, ind = 0, val = bool: whether write log, len = sizeof(EP0REPLYSTATUS)
 	USB_REQ_EP0_CANCEL_IO,				// 设置当前IO数据的有效性. req = me, ind = 0, val = 0, len = sizeof(uint32_t), discard IO data when data is CANCEL_IO_CANCEL
 										// work-flow: write control with 'CANCEL_IO_CANCEL', write bulk with 1 byte, write control with not 'CANCEL_IO_CANCEL' to restore
 	USB_REQ_EP0_SET_ENCRYPT,			// 设置加密方式， req = me, ind = 0, val = 0, len = sizeof(PACK_BASE)
@@ -258,9 +258,10 @@ typedef struct _ep0_reply
 
 typedef struct _peer_config
 {
-	uint16_t	ver;					// protocol version
+	uint64_t	pid;					// [in] - host pc process id; [out] - usb service process id
 	uint32_t	io_size;				// IO buffer size
-}PEERCFG, *LPPEERCFG;
+	uint16_t	ver;					// protocol version
+}PEERCFG, * LPPEERCFG;
 
 typedef struct _pack_base				// A piece of data has only one header
 {
diff --git a/sdk/base/plat_types.h b/sdk/base/plat_types.h
index 17f31ce..354fe72 100644
--- a/sdk/base/plat_types.h
+++ b/sdk/base/plat_types.h
@@ -16,6 +16,7 @@
 
 #define ALIGN_TO(v, align)          (((v) + (align) - 1) / (align) * (align))
 #define ALIGN_INT(v)                ALIGN_TO(v, sizeof(int))
+#define CLEAN_ARRAY(a)              memset(a, 0, sizeof(a))
 
 #define RETURN_ENUM_STR(v, e)       \
     if(v == e)                      \
diff --git a/sdk/base/utils.h b/sdk/base/utils.h
index 52c53af..f01aef7 100644
--- a/sdk/base/utils.h
+++ b/sdk/base/utils.h
@@ -94,6 +94,17 @@ namespace utils
 	bool run_get_message(HWND hwnd, UINT filter_min = 0, UINT filter_max = 0, std::function<bool(MSG*, bool*)> msghandler = std::function<bool(MSG*, bool*)>());
 #endif
 
+	template<typename ... Args>
+	std::string format_string(const char* fmt, Args ... args)
+	{
+		size_t 		size = snprintf(nullptr, 0, fmt, args ...) + 2;
+		std::unique_ptr<char[]> buf(new char[size]);
+
+		snprintf(buf.get(), size, fmt, args ...);
+
+		return buf.get();
+	}
+	
 	template<typename ... Args>
 	void to_log(int level, const char* fmt, Args ... args)
 	{
diff --git a/sdk/imgprc/img_processor.h b/sdk/imgprc/img_processor.h
index df3193c..2f48463 100644
--- a/sdk/imgprc/img_processor.h
+++ b/sdk/imgprc/img_processor.h
@@ -31,6 +31,7 @@ typedef struct _proc_img_info_
 {
 	HGIMGINFO	info;
 	cv::Mat		img;
+	std::string	ext_info;				// 图片扩展信息（图像处理过程中可以保存各算法间的共有信息；处理完后为向用户提供的扩展信息）
 }PROCIMGINFO, *LPPROCIMGINFO;
 
 typedef struct _proc_img_info_modules	// 跨模块参数
diff --git a/sdk/sane_opt_json/base_opt.cpp b/sdk/sane_opt_json/base_opt.cpp
index 70ae256..63069d2 100644
--- a/sdk/sane_opt_json/base_opt.cpp
+++ b/sdk/sane_opt_json/base_opt.cpp
@@ -2,6 +2,8 @@
 
 #include <json/gb_json.h>
 #include <huagao/hgscanner_error.h>
+#include <sane/sane_ex.h>
+#include <string.h>
 
 
 sane_opt_provider::sane_opt_provider()
@@ -16,6 +18,20 @@ sane_opt_provider::~sane_opt_provider()
 	following_.clear();
 }
 
+std::string sane_opt_provider::sane_value_2_text(const char* type, void* value)
+{
+	if(strcmp(type, JSON_SANE_TYPE_BOOL) == 0)
+		return *(bool*)value ? "true" : "false";
+	else if(strcmp(type, JSON_SANE_TYPE_INT) == 0)
+		return std::to_string(*(int*)value);
+	else if(strcmp(type, JSON_SANE_TYPE_FIXED) == 0)
+		return std::to_string(*(double*)value);
+	else if(strcmp(type, JSON_SANE_TYPE_STRING) == 0)
+		return (char*)value;
+	else
+		return "";
+}
+
 bool sane_opt_provider::set_opt_json_text(char* txt)
 {
 	gb_json* jsn = new gb_json();
diff --git a/sdk/sane_opt_json/base_opt.h b/sdk/sane_opt_json/base_opt.h
index 6f163cd..cb87518 100644
--- a/sdk/sane_opt_json/base_opt.h
+++ b/sdk/sane_opt_json/base_opt.h
@@ -22,6 +22,8 @@ protected:
 public:
 	sane_opt_provider();
 
+	static std::string sane_value_2_text(const char* type, void* value);	// convert to readable text. e.g. bool to "true" or "false", ...
+
 protected:
 	virtual ~sane_opt_provider();
 
diff --git a/sdk/sane_opt_json/device_opt.cpp b/sdk/sane_opt_json/device_opt.cpp
index 59aa556..54f2ed0 100644
--- a/sdk/sane_opt_json/device_opt.cpp
+++ b/sdk/sane_opt_json/device_opt.cpp
@@ -1207,7 +1207,11 @@ void device_option::insert_option(gb_json* opt, sane_opt_provider* from, const c
 
 		if (!opt->get_value("auto", can_auto) || can_auto)
 		{
+			std::string type("");
+			opt->get_value("type", type);
 			val.resize(size);
+			type = sane_opt_provider::sane_value_2_text(type.c_str(), &val[0]);
+			utils::to_log(LOG_LEVEL_ALL, "Set option '%s' to default value: '%s'\n", opt->key().c_str(), type.c_str());
 			from->set_value(opt->key().c_str(), &val[0]);
 		}
 	}
@@ -1716,8 +1720,9 @@ bool device_option::refine_data(const char* name, void* value)
 	now_->get_value(name, child);
 	if (child)
 	{
-		std::string type("");
+		std::string type(""), org(""), result("");
 		child->get_value("type", type);
+		org = sane_opt_provider::sane_value_2_text(type.c_str(), value);
 		if (type == JSON_SANE_TYPE_BOOL)
 		{
 			refined = refine_data_to_range<bool>(child, value);
@@ -1734,6 +1739,11 @@ bool device_option::refine_data(const char* name, void* value)
 		{
 			refined = refine_string_data(child, value);
 		}
+		if(refined)
+		{
+			result = sane_opt_provider::sane_value_2_text(type.c_str(), value);
+			utils::to_log(LOG_LEVEL_DEBUG, "Refine value of '%s' from '%s' to '%s'.\n", name, org.c_str(), result.c_str());
+		}
 
 		child->release();
 	}
@@ -1788,11 +1798,13 @@ int device_option::update_data(const char* name, void* value, bool reorder_if_ne
 					}
 				}
 
+				child->get_value("type", type);
+				utils::to_log(LOG_LEVEL_DEBUG, "set option '%s' value to '%s' = %d.\n", name, sane_opt_provider::sane_value_2_text(type.c_str(), value).c_str(), err);
+
 				if (err == SCANNER_ERR_OK || err == SCANNER_ERR_NOT_EXACT
 					|| err == SCANNER_ERR_RELOAD_IMAGE_PARAM || err == SCANNER_ERR_RELOAD_OPT_PARAM
 					|| err == SCANNER_ERR_CONFIGURATION_CHANGED)
 				{
-					child->get_value("type", type);
 					if (type == JSON_SANE_TYPE_BOOL)
 					{
 						child->set_value("cur", *(bool*)value);